uPlot.js

import {
	FEAT_TIME,
	FEAT_LEGEND,

	FEAT_POINTS,

	FEAT_PATHS,
	FEAT_PATHS_LINEAR,
	FEAT_PATHS_SPLINE,
	FEAT_PATHS_SPLINE2,
	FEAT_PATHS_STEPPED,
	FEAT_PATHS_BARS,

	FEAT_JOIN,
} from './feats';

import {
	copy,
	assign,
	PI,
	inf,
	abs,
	floor,
	round,
	roundDec,
	ceil,
	min,
	max,
	clamp,
	pow,
	asinh,
	sinh,
	log10,
	closestIdx,
	getMinMax,
	getMinMaxLog,
	rangeNum,
	rangeLog,
	rangeAsinh,
	incrRound,
	incrRoundUp,
	isArr,
	isObj,
	fastIsObj,
	isStr,
	fnOrSelf,
	fmtNum,
	fixedDec,
	ifNull,
	join,
	microTask,
	retArg0,
	retArg1,
	retNull,
	retTrue,
	EMPTY_OBJ,
	EMPTY_ARR,
	nullNullTuple,
	retEq,
	autoRangePart,
	rangePad,
	hasData,
	numIntDigits,
	isUndef,
	guessDec,
	cmpObj,
} from './utils';

import {
	WIDTH,
	HEIGHT,
	TOP,
	BOTTOM,
	LEFT,
	RIGHT,
	transparent,

	mousemove,
	mousedown,
	mouseup,
	mouseleave,
	mouseenter,
	dblclick,
	resize,
	scroll,

	dppxchange,
	LEGEND_DISP
} from './strings';

import {
	UPLOT,
	ORI_HZ,
	ORI_VT,
	TITLE,
	WRAP,
	UNDER,
	OVER,
	AXIS,
	OFF,
	SELECT,
	CURSOR_X,
	CURSOR_Y,
	CURSOR_PT,
	LEGEND,
	LEGEND_LIVE,
	LEGEND_INLINE,
	LEGEND_SERIES,
	LEGEND_MARKER,
	LEGEND_LABEL,
	LEGEND_VALUE,
} from './domClasses';

import {
	domEnv,
	doc,
	win,
	pxRatio,

	addClass,
	remClass,
	setStylePx,
	placeTag,
	placeDiv,
	elTrans,
	elColor,
	elSize,
	on,
	off,
} from './dom';

import {
	fmtDate,
	tzDate,
} from './fmtDate';

import {
	ptDia,
	cursorOpts,

	xAxisOpts,
	yAxisOpts,
	xSeriesOpts,
	ySeriesOpts,
	xScaleOpts,
	yScaleOpts,

	xySeriesOpts,

	clampScale,

	timeIncrsMs,
	timeIncrsS,

	wholeIncrs,
	numIncrs,
	timeAxisVal,
	timeAxisVals,
	numAxisVals,

	log2AxisValsFilt,
	log10AxisValsFilt,

	timeSeriesVal,
	numSeriesVal,

	timeSeriesLabel,
	numSeriesLabel,

	timeAxisSplitsMs,
	timeAxisSplitsS,

	numAxisSplits,
	logAxisSplits,
	asinhAxisSplits,

	timeAxisStamps,

	_timeAxisStampsMs,
	_timeAxisStampsS,

	timeSeriesStamp,
	_timeSeriesStamp,

	legendOpts,
} from './opts';

import { _sync } from './sync';

import { points   } from './paths/points';
import { linear   } from './paths/linear';
import { stepped  } from './paths/stepped';
import { bars     } from './paths/bars';
import { monotoneCubic     as spline  } from './paths/monotoneCubic';
import { catmullRomCentrip as spline2 } from './paths/catmullRomCentrip';

import { addGap, clipGaps, moveToH, moveToV, arcH, arcV, orient, pxRoundGen, seriesFillTo, BAND_CLIP_FILL, BAND_CLIP_STROKE } from './paths/utils';

function log(name, args) {
	console.log.apply(console, [name].concat(Array.prototype.slice.call(args)));
}

const cursorPlots = new Set();

function invalidateRects() {
	for (let u of cursorPlots)
		u.syncRect(true);
}

if (domEnv) {
	on(resize, win, invalidateRects);
	on(scroll, win, invalidateRects, true);
	on(dppxchange, win, () => { uPlot.pxRatio = pxRatio; });
}

const linearPath = FEAT_PATHS && FEAT_PATHS_LINEAR ? linear() : null;
const pointsPath = FEAT_POINTS ? points() : null;

function setDefaults(d, xo, yo, initY) {
	let d2 = initY ? [d[0], d[1]].concat(d.slice(2)) : [d[0]].concat(d.slice(1));
	return d2.map((o, i) => setDefault(o, i, xo, yo));
}

function setDefaults2(d, xyo) {
	return d.map((o, i) => i == 0 ? null : assign({}, xyo, o));  // todo: assign() will not merge facet arrays
}

function setDefault(o, i, xo, yo) {
	return assign({}, (i == 0 ? xo : yo), o);
}

function snapNumX(self, dataMin, dataMax) {
	return dataMin == null ? nullNullTuple : [dataMin, dataMax];
}

const snapTimeX = snapNumX;

// this ensures that non-temporal/numeric y-axes get multiple-snapped padding added above/below
// TODO: also account for incrs when snapping to ensure top of axis gets a tick & value
function snapNumY(self, dataMin, dataMax) {
	return dataMin == null ? nullNullTuple : rangeNum(dataMin, dataMax, rangePad, true);
}

function snapLogY(self, dataMin, dataMax, scale) {
	return dataMin == null ? nullNullTuple : rangeLog(dataMin, dataMax, self.scales[scale].log, false);
}

const snapLogX = snapLogY;

function snapAsinhY(self, dataMin, dataMax, scale) {
	return dataMin == null ? nullNullTuple : rangeAsinh(dataMin, dataMax, self.scales[scale].log, false);
}

const snapAsinhX = snapAsinhY;

// dim is logical (getClientBoundingRect) pixels, not canvas pixels
function findIncr(minVal, maxVal, incrs, dim, minSpace) {
	let intDigits = max(numIntDigits(minVal), numIntDigits(maxVal));

	let delta = maxVal - minVal;

	let incrIdx = closestIdx((minSpace / dim) * delta, incrs);

	do {
		let foundIncr = incrs[incrIdx];
		let foundSpace = dim * foundIncr / delta;

		if (foundSpace >= minSpace && intDigits + (foundIncr < 5 ? fixedDec.get(foundIncr) : 0) <= 17)
			return [foundIncr, foundSpace];
	} while (++incrIdx < incrs.length);

	return [0, 0];
}

function pxRatioFont(font) {
	let fontSize, fontSizeCss;
	font = font.replace(/(\d+)px/, (m, p1) => (fontSize = round((fontSizeCss = +p1) * pxRatio)) + 'px');
	return [font, fontSize, fontSizeCss];
}

function syncFontSize(axis) {
	if (axis.show) {
		[axis.font, axis.labelFont].forEach(f => {
			let size = roundDec(f[2] * pxRatio, 1);
			f[0] = f[0].replace(/[0-9.]+px/, size + 'px');
			f[1] = size;
		});
	}
}

export default function uPlot(opts, data, then) {
	const self = {
		mode: ifNull(opts.mode, 1),
	};

	const mode = self.mode;

	// TODO: cache denoms & mins scale.cache = {r, min, }
	function getValPct(val, scale) {
		let _val = (
			scale.distr == 3 ? log10(val > 0 ? val : scale.clamp(self, val, scale.min, scale.max, scale.key)) :
			scale.distr == 4 ? asinh(val, scale.asinh) :
			val
		);

		return (_val - scale._min) / (scale._max - scale._min);
	}

	function getHPos(val, scale, dim, off) {
		let pct = getValPct(val, scale);
		return off + dim * (scale.dir == -1 ? (1 - pct) : pct);
	}

	function getVPos(val, scale, dim, off) {
		let pct = getValPct(val, scale);
		return off + dim * (scale.dir == -1 ? pct : (1 - pct));
	}

	function getPos(val, scale, dim, off) {
		return scale.ori == 0 ? getHPos(val, scale, dim, off) : getVPos(val, scale, dim, off);
	}

	self.valToPosH = getHPos;
	self.valToPosV = getVPos

	let ready = false;
	self.status = 0;

	const root = self.root = placeDiv(UPLOT);

	if (opts.id != null)
		root.id = opts.id;

	addClass(root, opts.class);

	if (opts.title) {
		let title = placeDiv(TITLE, root);
		title.textContent = opts.title;
	}

	const can = placeTag("canvas");
	const ctx = self.ctx = can.getContext("2d");

	const wrap = placeDiv(WRAP, root);

	on("click", wrap, e => {
		if (e.target === over) {
			let didDrag = mouseLeft1 != mouseLeft0 || mouseTop1 != mouseTop0;
			didDrag && drag.click(self, e);
		}
	}, true);

	const under = self.under = placeDiv(UNDER, wrap);
	wrap.appendChild(can);
	const over = self.over = placeDiv(OVER, wrap);

	opts = copy(opts);

	const pxAlign = +ifNull(opts.pxAlign, 1);

	const pxRound = pxRoundGen(pxAlign);

	(opts.plugins || []).forEach(p => {
		if (p.opts)
			opts = p.opts(self, opts) || opts;
	});

	const ms = opts.ms || 1e-3;

	const series  = self.series = mode == 1 ?
		setDefaults(opts.series || [], xSeriesOpts, ySeriesOpts, false) :
		setDefaults2(opts.series || [null], xySeriesOpts);
	const axes    = self.axes   = setDefaults(opts.axes   || [], xAxisOpts,   yAxisOpts,    true);
	const scales  = self.scales = {};
	const bands   = self.bands  = opts.bands || [];

	bands.forEach(b => {
		b.fill = fnOrSelf(b.fill || null);
		b.dir = ifNull(b.dir, -1);
	});

	const xScaleKey = mode == 2 ? series[1].facets[0].scale : series[0].scale;

	const drawOrderMap = {
		axes: drawAxesGrid,
		series: drawSeries,
	};

	const drawOrder = (opts.drawOrder || ["axes", "series"]).map(key => drawOrderMap[key]);

	function initScale(scaleKey) {
		let sc = scales[scaleKey];

		if (sc == null) {
			let scaleOpts = (opts.scales || EMPTY_OBJ)[scaleKey] || EMPTY_OBJ;

			if (scaleOpts.from != null) {
				// ensure parent is initialized
				initScale(scaleOpts.from);
				// dependent scales inherit
				scales[scaleKey] = assign({}, scales[scaleOpts.from], scaleOpts, {key: scaleKey});
			}
			else {
				sc = scales[scaleKey] = assign({}, (scaleKey == xScaleKey ? xScaleOpts : yScaleOpts), scaleOpts);

				sc.key = scaleKey;

				let isTime = FEAT_TIME && sc.time;

				let rn = sc.range;

				let rangeIsArr = isArr(rn);

				if (scaleKey != xScaleKey || (mode == 2 && !isTime)) {
					// if range array has null limits, it should be auto
					if (rangeIsArr && (rn[0] == null || rn[1] == null)) {
						rn = {
							min: rn[0] == null ? autoRangePart : {
								mode: 1,
								hard: rn[0],
								soft: rn[0],
							},
							max: rn[1] == null ? autoRangePart : {
								mode: 1,
								hard: rn[1],
								soft: rn[1],
							},
						};
						rangeIsArr = false;
					}

					if (!rangeIsArr && isObj(rn)) {
						let cfg = rn;
						// this is similar to snapNumY
						rn = (self, dataMin, dataMax) => dataMin == null ? nullNullTuple : rangeNum(dataMin, dataMax, cfg);
					}
				}

				sc.range = fnOrSelf(rn || (isTime ? snapTimeX : scaleKey == xScaleKey ?
					(sc.distr == 3 ? snapLogX : sc.distr == 4 ? snapAsinhX : snapNumX) :
					(sc.distr == 3 ? snapLogY : sc.distr == 4 ? snapAsinhY : snapNumY)
				));

				sc.auto = fnOrSelf(rangeIsArr ? false : sc.auto);

				sc.clamp = fnOrSelf(sc.clamp || clampScale);

				// caches for expensive ops like asinh() & log()
				sc._min = sc._max = null;
			}
		}
	}

	initScale("x");
	initScale("y");

	// TODO: init scales from facets in mode: 2
	if (mode == 1) {
		series.forEach(s => {
			initScale(s.scale);
		});
	}

	axes.forEach(a => {
		initScale(a.scale);
	});

	for (let k in opts.scales)
		initScale(k);

	const scaleX = scales[xScaleKey];

	const xScaleDistr = scaleX.distr;

	let valToPosX, valToPosY, moveTo, arc, xDimCan, xOffCan, yDimCan, yOffCan, xDimCss, xOffCss, yDimCss, yOffCss, updOriDims;

	if (scaleX.ori == 0) {
		addClass(root, ORI_HZ);
		valToPosX = getHPos;
		valToPosY = getVPos;
		moveTo    = moveToH;
		arc       = arcH;
		/*
		updOriDims = () => {
			xDimCan = plotWid;
			xOffCan = plotLft;
			yDimCan = plotHgt;
			yOffCan = plotTop;

			xDimCss = plotWidCss;
			xOffCss = plotLftCss;
			yDimCss = plotHgtCss;
			yOffCss = plotTopCss;
		};
		*/
	}
	else {
		addClass(root, ORI_VT);
		valToPosX = getVPos;
		valToPosY = getHPos;
		moveTo    = moveToV;
		arc       = arcV;
		/*
		updOriDims = () => {
			xDimCan = plotHgt;
			xOffCan = plotTop;
			yDimCan = plotWid;
			yOffCan = plotLft;

			xDimCss = plotHgtCss;
			xOffCss = plotTopCss;
			yDimCss = plotWidCss;
			yOffCss = plotLftCss;
		};
		*/
	}

	const pendScales = {};

	// explicitly-set initial scales
	for (let k in scales) {
		let sc = scales[k];

		if (sc.min != null || sc.max != null) {
			pendScales[k] = {min: sc.min, max: sc.max};
			sc.min = sc.max = null;
		}
	}

//	self.tz = opts.tz || Intl.DateTimeFormat().resolvedOptions().timeZone;
	const _tzDate  = FEAT_TIME && (opts.tzDate || (ts => new Date(round(ts / ms))));
	const _fmtDate = FEAT_TIME && (opts.fmtDate || fmtDate);

	const _timeAxisSplits = FEAT_TIME && (ms == 1 ? timeAxisSplitsMs(_tzDate) : timeAxisSplitsS(_tzDate));
	const _timeAxisVals   = FEAT_TIME && timeAxisVals(_tzDate, timeAxisStamps((ms == 1 ? _timeAxisStampsMs : _timeAxisStampsS), _fmtDate));
	const _timeSeriesVal  = FEAT_TIME && timeSeriesVal(_tzDate, timeSeriesStamp(_timeSeriesStamp, _fmtDate));

	const activeIdxs = [];

	const legend     = FEAT_LEGEND && (self.legend = assign({}, legendOpts, opts.legend));
	const showLegend = FEAT_LEGEND && legend.show;
	const markers    = FEAT_LEGEND && legend.markers;

	if (FEAT_LEGEND) {
		legend.idxs = activeIdxs;

		markers.width  = fnOrSelf(markers.width);
		markers.dash   = fnOrSelf(markers.dash);
		markers.stroke = fnOrSelf(markers.stroke);
		markers.fill   = fnOrSelf(markers.fill);
	}

	let legendTable;
	let legendHead;
	let legendBody;
	let legendRows = [];
	let legendCells = [];
	let legendCols;
	let multiValLegend = false;
	let NULL_LEGEND_VALUES = {};

	if (FEAT_LEGEND && legend.live) {
		const getMultiVals = series[1] ? series[1].values : null;
		multiValLegend = getMultiVals != null;
		legendCols = multiValLegend ? getMultiVals(self, 1, 0) : {_: 0};

		for (let k in legendCols)
			NULL_LEGEND_VALUES[k] = LEGEND_DISP;
	}

	if (showLegend) {
		legendTable = placeTag("table", LEGEND, root);
		legendBody = placeTag("tbody", null, legendTable);

		// allows legend to be moved out of root
		legend.mount(self, legendTable);

		if (multiValLegend) {
			legendHead = placeTag("thead", null, legendTable, legendBody);

			let head = placeTag("tr", null, legendHead);
			placeTag("th", null, head);

			for (var key in legendCols)
				placeTag("th", LEGEND_LABEL, head).textContent = key;
		}
		else {
			addClass(legendTable, LEGEND_INLINE);
			legend.live && addClass(legendTable, LEGEND_LIVE);
		}
	}

	const son  = {show: true};
	const soff = {show: false};

	function initLegendRow(s, i) {
		if (i == 0 && (multiValLegend || !legend.live || mode == 2))
			return nullNullTuple;

		let cells = [];

		let row = placeTag("tr", LEGEND_SERIES, legendBody, legendBody.childNodes[i]);

		addClass(row, s.class);

		if (!s.show)
			addClass(row, OFF);

		let label = placeTag("th", null, row);

		if (markers.show) {
			let indic = placeDiv(LEGEND_MARKER, label);

			if (i > 0) {
				let width  = markers.width(self, i);

				if (width)
					indic.style.border = width + "px " + markers.dash(self, i) + " " + markers.stroke(self, i);

				indic.style.background = markers.fill(self, i);
			}
		}

		let text = placeDiv(LEGEND_LABEL, label);
		text.textContent = s.label;

		if (i > 0) {
			if (!markers.show)
				text.style.color = s.width > 0 ? markers.stroke(self, i) : markers.fill(self, i);

			onMouse("click", label, e => {
				if (cursor._lock)
					return;

				setCursorEvent(e);

				let seriesIdx = series.indexOf(s);

				if ((e.ctrlKey || e.metaKey) != legend.isolate) {
					// if any other series is shown, isolate this one. else show all
					let isolate = series.some((s, i) => i > 0 && i != seriesIdx && s.show);

					series.forEach((s, i) => {
						i > 0 && setSeries(i, isolate ? (i == seriesIdx ? son : soff) : son, true, syncOpts.setSeries);
					});
				}
				else
					setSeries(seriesIdx, {show: !s.show}, true, syncOpts.setSeries);
			}, false);

			if (cursorFocus) {
				onMouse(mouseenter, label, e => {
					if (cursor._lock)
						return;

					setCursorEvent(e);

					setSeries(series.indexOf(s), FOCUS_TRUE, true, syncOpts.setSeries);
				}, false);
			}
		}

		for (var key in legendCols) {
			let v = placeTag("td", LEGEND_VALUE, row);
			v.textContent = "--";
			cells.push(v);
		}

		return [row, cells];
	}

	const mouseListeners = new Map();

	function onMouse(ev, targ, fn, onlyTarg = true) {
		const targListeners = mouseListeners.get(targ) || {};
		const listener = cursor.bind[ev](self, targ, fn, onlyTarg);

		if (listener) {
			on(ev, targ, targListeners[ev] = listener);
			mouseListeners.set(targ, targListeners);
		}
	}

	function offMouse(ev, targ, fn) {
		const targListeners = mouseListeners.get(targ) || {};

		for (let k in targListeners) {
			if (ev == null || k == ev) {
				off(k, targ, targListeners[k]);
				delete targListeners[k];
			}
		}

		if (ev == null)
			mouseListeners.delete(targ);
	}

	let fullWidCss = 0;
	let fullHgtCss = 0;

	let plotWidCss = 0;
	let plotHgtCss = 0;

	// plot margins to account for axes
	let plotLftCss = 0;
	let plotTopCss = 0;

	let plotLft = 0;
	let plotTop = 0;
	let plotWid = 0;
	let plotHgt = 0;

	self.bbox = {};

	let shouldSetScales = false;
	let shouldSetSize = false;
	let shouldConvergeSize = false;
	let shouldSetCursor = false;
	let shouldSetSelect = false;
	let shouldSetLegend = false;

	function _setSize(width, height, force) {
		if (force || (width != self.width || height != self.height))
			calcSize(width, height);

		resetYSeries(false);

		shouldConvergeSize = true;
		shouldSetSize = true;

		if (cursor.left >= 0)
			shouldSetCursor = shouldSetLegend = true;

		commit();
	}

	function calcSize(width, height) {
	//	log("calcSize()", arguments);

		self.width  = fullWidCss = plotWidCss = width;
		self.height = fullHgtCss = plotHgtCss = height;
		plotLftCss  = plotTopCss = 0;

		calcPlotRect();
		calcAxesRects();

		let bb = self.bbox;

		plotLft = bb.left   = incrRound(plotLftCss * pxRatio, 0.5);
		plotTop = bb.top    = incrRound(plotTopCss * pxRatio, 0.5);
		plotWid = bb.width  = incrRound(plotWidCss * pxRatio, 0.5);
		plotHgt = bb.height = incrRound(plotHgtCss * pxRatio, 0.5);

	//	updOriDims();
	}

	// ensures size calc convergence
	const CYCLE_LIMIT = 3;

	function convergeSize() {
		let converged = false;

		let cycleNum = 0;

		while (!converged) {
			cycleNum++;

			let axesConverged = axesCalc(cycleNum);
			let paddingConverged = paddingCalc(cycleNum);

			converged = cycleNum == CYCLE_LIMIT || (axesConverged && paddingConverged);

			if (!converged) {
				calcSize(self.width, self.height);
				shouldSetSize = true;
			}
		}
	}

	function setSize({width, height}) {
		_setSize(width, height);
	}

	self.setSize = setSize;

	// accumulate axis offsets, reduce canvas width
	function calcPlotRect() {
		// easements for edge labels
		let hasTopAxis = false;
		let hasBtmAxis = false;
		let hasRgtAxis = false;
		let hasLftAxis = false;

		axes.forEach((axis, i) => {
			if (axis.show && axis._show) {
				let {side, _size} = axis;
				let isVt = side % 2;
				let labelSize = axis.label != null ? axis.labelSize : 0;

				let fullSize = _size + labelSize;

				if (fullSize > 0) {
					if (isVt) {
						plotWidCss -= fullSize;

						if (side == 3) {
							plotLftCss += fullSize;
							hasLftAxis = true;
						}
						else
							hasRgtAxis = true;
					}
					else {
						plotHgtCss -= fullSize;

						if (side == 0) {
							plotTopCss += fullSize;
							hasTopAxis = true;
						}
						else
							hasBtmAxis = true;
					}
				}
			}
		});

		sidesWithAxes[0] = hasTopAxis;
		sidesWithAxes[1] = hasRgtAxis;
		sidesWithAxes[2] = hasBtmAxis;
		sidesWithAxes[3] = hasLftAxis;

		// hz padding
		plotWidCss -= _padding[1] + _padding[3];
		plotLftCss += _padding[3];

		// vt padding
		plotHgtCss -= _padding[2] + _padding[0];
		plotTopCss += _padding[0];
	}

	function calcAxesRects() {
		// will accum +
		let off1 = plotLftCss + plotWidCss;
		let off2 = plotTopCss + plotHgtCss;
		// will accum -
		let off3 = plotLftCss;
		let off0 = plotTopCss;

		function incrOffset(side, size) {
			switch (side) {
				case 1: off1 += size; return off1 - size;
				case 2: off2 += size; return off2 - size;
				case 3: off3 -= size; return off3 + size;
				case 0: off0 -= size; return off0 + size;
			}
		}

		axes.forEach((axis, i) => {
			if (axis.show && axis._show) {
				let side = axis.side;

				axis._pos = incrOffset(side, axis._size);

				if (axis.label != null)
					axis._lpos = incrOffset(side, axis.labelSize);
			}
		});
	}

	const cursor = self.cursor = assign({}, cursorOpts, {drag: {y: mode == 2}}, opts.cursor);
	const setCursorEvent = e => { cursor.event = e; };

	cursor.idxs = activeIdxs;

	cursor._lock = false;

	let points = cursor.points;

	points.show   = fnOrSelf(points.show);
	points.size   = fnOrSelf(points.size);
	points.stroke = fnOrSelf(points.stroke);
	points.width  = fnOrSelf(points.width);
	points.fill   = fnOrSelf(points.fill);

	const focus = self.focus = assign({}, opts.focus || {alpha: 0.3}, cursor.focus);

	const cursorFocus = focus.prox >= 0;

	// series-intersection markers
	let cursorPts = [null];

	function initCursorPt(s, si) {
		if (si > 0) {
			let pt = cursor.points.show(self, si);

			if (pt) {
				addClass(pt, CURSOR_PT);
				addClass(pt, s.class);
				elTrans(pt, -10, -10, plotWidCss, plotHgtCss);
				over.insertBefore(pt, cursorPts[si]);

				return pt;
			}
		}
	}

	function initSeries(s, i) {
		if (mode == 1 || i > 0) {
			let isTime = FEAT_TIME && mode == 1 && scales[s.scale].time;

			let sv = s.value;
			s.value = isTime ? (isStr(sv) ? timeSeriesVal(_tzDate, timeSeriesStamp(sv, _fmtDate)) : sv || _timeSeriesVal) : sv || numSeriesVal;
			s.label = s.label || (isTime ? timeSeriesLabel : numSeriesLabel);
		}

		if (i > 0) {
			s.width  = s.width == null ? 1 : s.width;
			s.paths  = s.paths || linearPath || retNull;
			s.fillTo = fnOrSelf(s.fillTo || seriesFillTo);
			s.pxAlign = +ifNull(s.pxAlign, pxAlign);
			s.pxRound = pxRoundGen(s.pxAlign);

			s.stroke = fnOrSelf(s.stroke || null);
			s.fill   = fnOrSelf(s.fill || null);
			s._stroke = s._fill = s._paths = s._focus = null;

			let _ptDia = ptDia(max(1, s.width), 1);
			let points = s.points = assign({}, {
				size: _ptDia,
				width: max(1, _ptDia * .2),
				stroke: s.stroke,
				space: _ptDia * 2,
				paths: pointsPath,
				_stroke: null,
				_fill: null,
			}, s.points);
			points.show   = fnOrSelf(points.show);
			points.filter = fnOrSelf(points.filter);
			points.fill   = fnOrSelf(points.fill);
			points.stroke = fnOrSelf(points.stroke);
			points.paths  = fnOrSelf(points.paths);
			points.pxAlign = s.pxAlign;
		}

		if (showLegend) {
			let rowCells = initLegendRow(s, i);
			legendRows.splice(i, 0, rowCells[0]);
			legendCells.splice(i, 0, rowCells[1]);
			legend.values.push(null);	// NULL_LEGEND_VALS not yet avil here :(
		}

		if (cursor.show) {
			activeIdxs.splice(i, 0, null);

			let pt = initCursorPt(s, i);
			pt && cursorPts.splice(i, 0, pt);
		}

		fire("addSeries", i);
	}

	function addSeries(opts, si) {
		si = si == null ? series.length : si;

		opts = mode == 1 ? setDefault(opts, si, xSeriesOpts, ySeriesOpts) : setDefault(opts, si, null, xySeriesOpts);

		series.splice(si, 0, opts);
		initSeries(series[si], si);
	}

	self.addSeries = addSeries;

	function delSeries(i) {
		series.splice(i, 1);

		if (showLegend) {
			legend.values.splice(i, 1);

			legendCells.splice(i, 1);
			let tr = legendRows.splice(i, 1)[0];
			offMouse(null, tr.firstChild);
			tr.remove();
		}

		if (cursor.show) {
			activeIdxs.splice(i, 1);

			cursorPts.length > 1 && cursorPts.splice(i, 1)[0].remove();
		}

		// TODO: de-init no-longer-needed scales?

		fire("delSeries", i);
	}

	self.delSeries = delSeries;

	const sidesWithAxes = [false, false, false, false];

	function initAxis(axis, i) {
		axis._show = axis.show;

		if (axis.show) {
			let isVt = axis.side % 2;

			let sc = scales[axis.scale];

			// this can occur if all series specify non-default scales
			if (sc == null) {
				axis.scale = isVt ? series[1].scale : xScaleKey;
				sc = scales[axis.scale];
			}

			// also set defaults for incrs & values based on axis distr
			let isTime = FEAT_TIME && sc.time;

			axis.size   = fnOrSelf(axis.size);
			axis.space  = fnOrSelf(axis.space);
			axis.rotate = fnOrSelf(axis.rotate);

			if (isArr(axis.incrs)) {
				axis.incrs.forEach(incr => {
					!fixedDec.has(incr) && fixedDec.set(incr, guessDec(incr));
				});
			}

			axis.incrs  = fnOrSelf(axis.incrs  || (          sc.distr == 2 ? wholeIncrs : (isTime ? (ms == 1 ? timeIncrsMs : timeIncrsS) : numIncrs)));
			axis.splits = fnOrSelf(axis.splits || (isTime && sc.distr == 1 ? _timeAxisSplits : sc.distr == 3 ? logAxisSplits : sc.distr == 4 ? asinhAxisSplits : numAxisSplits));

			axis.stroke        = fnOrSelf(axis.stroke);
			axis.grid.stroke   = fnOrSelf(axis.grid.stroke);
			axis.ticks.stroke  = fnOrSelf(axis.ticks.stroke);
			axis.border.stroke = fnOrSelf(axis.border.stroke);

			let av = axis.values;

			axis.values = (
				// static array of tick values
				isArr(av) && !isArr(av[0]) ? fnOrSelf(av) :
				// temporal
				isTime ? (
					// config array of fmtDate string tpls
					isArr(av) ?
						timeAxisVals(_tzDate, timeAxisStamps(av, _fmtDate)) :
					// fmtDate string tpl
					isStr(av) ?
						timeAxisVal(_tzDate, av) :
					av || _timeAxisVals
				) : av || numAxisVals
			);

			axis.filter = fnOrSelf(axis.filter || (          sc.distr >= 3 && sc.log == 10 ? log10AxisValsFilt : sc.distr == 3 && sc.log == 2 ? log2AxisValsFilt : retArg1));

			axis.font      = pxRatioFont(axis.font);
			axis.labelFont = pxRatioFont(axis.labelFont);

			axis._size   = axis.size(self, null, i, 0);

			axis._space  =
			axis._rotate =
			axis._incrs  =
			axis._found  =	// foundIncrSpace
			axis._splits =
			axis._values = null;

			if (axis._size > 0) {
				sidesWithAxes[i] = true;
				axis._el = placeDiv(AXIS, wrap);
			}

			// debug
		//	axis._el.style.background = "#"  + Math.floor(Math.random()*16777215).toString(16) + '80';
		}
	}

	function autoPadSide(self, side, sidesWithAxes, cycleNum) {
		let [hasTopAxis, hasRgtAxis, hasBtmAxis, hasLftAxis] = sidesWithAxes;

		let ori = side % 2;
		let size = 0;

		if (ori == 0 && (hasLftAxis || hasRgtAxis))
			size = (side == 0 && !hasTopAxis || side == 2 && !hasBtmAxis ? round(xAxisOpts.size / 3) : 0);
		if (ori == 1 && (hasTopAxis || hasBtmAxis))
			size = (side == 1 && !hasRgtAxis || side == 3 && !hasLftAxis ? round(yAxisOpts.size / 2) : 0);

		return size;
	}

	const padding = self.padding = (opts.padding || [autoPadSide,autoPadSide,autoPadSide,autoPadSide]).map(p => fnOrSelf(ifNull(p, autoPadSide)));
	const _padding = self._padding = padding.map((p, i) => p(self, i, sidesWithAxes, 0));

	let dataLen;

	// rendered data window
	let i0 = null;
	let i1 = null;
	const idxs = mode == 1 ? series[0].idxs : null;

	let data0 = null;

	let viaAutoScaleX = false;

	function setData(_data, _resetScales) {
		data = _data == null ? [] : copy(_data, fastIsObj);

		if (mode == 2) {
			dataLen = 0;
			for (let i = 1; i < series.length; i++)
				dataLen += data[i][0].length;
			self.data = data = _data;
		}
		else {
			if (data[0] == null)
				data[0] = [];

			self.data = data.slice();

			data0 = data[0];
			dataLen = data0.length;

			if (xScaleDistr == 2) {
				data[0] = Array(dataLen);
				for (let i = 0; i < dataLen; i++)
					data[0][i] = i;
			}
		}

		self._data = data;

		resetYSeries(true);

		fire("setData");

		// forces x axis tick values to re-generate when neither x scale nor y scale changes
		// in ordinal mode, scale range is by index, so will not change if new data has same length, but tick values are from data
		if (xScaleDistr == 2) {
			shouldConvergeSize = true;

			/* or somewhat cheaper, and uglier:
			if (ready) {
				// logic extracted from axesCalc()
				let i = 0;
				let axis = axes[i];
				let _splits = axis._splits.map(i => data0[i]);
				let [_incr, _space] = axis._found;
				let incr = data0[_splits[1]] - data0[_splits[0]];
				axis._values = axis.values(self, axis.filter(self, _splits, i, _space, incr), i, _space, incr);
			}
			*/
		}

		if (_resetScales !== false) {
			let xsc = scaleX;

			if (xsc.auto(self, viaAutoScaleX))
				autoScaleX();
			else
				_setScale(xScaleKey, xsc.min, xsc.max);

			shouldSetCursor = shouldSetCursor || cursor.left >= 0;
			shouldSetLegend = true;
			commit();
		}
	}

	self.setData = setData;

	function autoScaleX() {
		viaAutoScaleX = true;

		let _min, _max;

		if (mode == 1) {
			if (dataLen > 0) {
				i0 = idxs[0] = 0;
				i1 = idxs[1] = dataLen - 1;

				_min = data[0][i0];
				_max = data[0][i1];

				if (xScaleDistr == 2) {
					_min = i0;
					_max = i1;
				}
				else if (_min == _max) {
					if (xScaleDistr == 3)
						[_min, _max] = rangeLog(_min, _min, scaleX.log, false);
					else if (xScaleDistr == 4)
						[_min, _max] = rangeAsinh(_min, _min, scaleX.log, false);
					else if (scaleX.time)
						_max = _min + round(86400 / ms);
					else
						[_min, _max] = rangeNum(_min, _max, rangePad, true);
				}
			}
			else {
				i0 = idxs[0] = _min = null;
				i1 = idxs[1] = _max = null;
			}
		}

		_setScale(xScaleKey, _min, _max);
	}

	let ctxStroke, ctxFill, ctxWidth, ctxDash, ctxJoin, ctxCap, ctxFont, ctxAlign, ctxBaseline;
	let ctxAlpha;

	function setCtxStyle(stroke, width, dash, cap, fill, join) {
		stroke ??= transparent;
		dash   ??= EMPTY_ARR;
		cap    ??= "butt"; // (‿|‿)
		fill   ??= transparent;
		join   ??= "round";

		if (stroke != ctxStroke)
			ctx.strokeStyle = ctxStroke = stroke;
		if (fill != ctxFill)
			ctx.fillStyle = ctxFill = fill;
		if (width != ctxWidth)
			ctx.lineWidth = ctxWidth = width;
		if (join != ctxJoin)
			ctx.lineJoin = ctxJoin = join;
		if (cap != ctxCap)
			ctx.lineCap = ctxCap = cap;
		if (dash != ctxDash)
			ctx.setLineDash(ctxDash = dash);
	}

	function setFontStyle(font, fill, align, baseline) {
		if (fill != ctxFill)
			ctx.fillStyle = ctxFill = fill;
		if (font != ctxFont)
			ctx.font = ctxFont = font;
		if (align != ctxAlign)
			ctx.textAlign = ctxAlign = align;
		if (baseline != ctxBaseline)
			ctx.textBaseline = ctxBaseline = baseline;
	}

	function accScale(wsc, psc, facet, data, sorted = 0) {
		if (data.length > 0 && wsc.auto(self, viaAutoScaleX) && (psc == null || psc.min == null)) {
			let _i0 = ifNull(i0, 0);
			let _i1 = ifNull(i1, data.length - 1);

			// only run getMinMax() for invalidated series data, else reuse
			let minMax = facet.min == null ? (wsc.distr == 3 ? getMinMaxLog(data, _i0, _i1) : getMinMax(data, _i0, _i1, sorted)) : [facet.min, facet.max];

			// initial min/max
			wsc.min = min(wsc.min, facet.min = minMax[0]);
			wsc.max = max(wsc.max, facet.max = minMax[1]);
		}
	}

	function setScales() {
	//	log("setScales()", arguments);

		// wip scales
		let wipScales = copy(scales, fastIsObj);

		for (let k in wipScales) {
			let wsc = wipScales[k];
			let psc = pendScales[k];

			if (psc != null && psc.min != null) {
				assign(wsc, psc);

				// explicitly setting the x-scale invalidates everything (acts as redraw)
				if (k == xScaleKey)
					resetYSeries(true);
			}
			else if (k != xScaleKey || mode == 2) {
				if (dataLen == 0 && wsc.from == null) {
					let minMax = wsc.range(self, null, null, k);
					wsc.min = minMax[0];
					wsc.max = minMax[1];
				}
				else {
					wsc.min = inf;
					wsc.max = -inf;
				}
			}
		}

		if (dataLen > 0) {
			// pre-range y-scales from y series' data values
			series.forEach((s, i) => {
				if (mode == 1) {
					let k = s.scale;
					let wsc = wipScales[k];
					let psc = pendScales[k];

					if (i == 0) {
						let minMax = wsc.range(self, wsc.min, wsc.max, k);

						wsc.min = minMax[0];
						wsc.max = minMax[1];

						i0 = closestIdx(wsc.min, data[0]);
						i1 = closestIdx(wsc.max, data[0]);

						// don't try to contract same or adjacent idxs
						if (i1 - i0 > 1) {
							// closest indices can be outside of view
							if (data[0][i0] < wsc.min)
								i0++;
							if (data[0][i1] > wsc.max)
								i1--;
						}

						s.min = data0[i0];
						s.max = data0[i1];
					}
					else if (s.show && s.auto)
						accScale(wsc, psc, s, data[i], s.sorted);

					s.idxs[0] = i0;
					s.idxs[1] = i1;
				}
				else {
					if (i > 0) {
						if (s.show && s.auto) {
							// TODO: only handles, assumes and requires facets[0] / 'x' scale, and facets[1] / 'y' scale
							let [ xFacet, yFacet ] = s.facets;
							let xScaleKey = xFacet.scale;
							let yScaleKey = yFacet.scale;
							let [ xData, yData ] = data[i];

							accScale(wipScales[xScaleKey], pendScales[xScaleKey], xFacet, xData, xFacet.sorted);
							accScale(wipScales[yScaleKey], pendScales[yScaleKey], yFacet, yData, yFacet.sorted);

							// temp
							s.min = yFacet.min;
							s.max = yFacet.max;
						}
					}
				}
			});

			// range independent scales
			for (let k in wipScales) {
				let wsc = wipScales[k];
				let psc = pendScales[k];

				if (wsc.from == null && (psc == null || psc.min == null)) {
					let minMax = wsc.range(
						self,
						wsc.min ==  inf ? null : wsc.min,
						wsc.max == -inf ? null : wsc.max,
						k
					);
					wsc.min = minMax[0];
					wsc.max = minMax[1];
				}
			}
		}

		// range dependent scales
		for (let k in wipScales) {
			let wsc = wipScales[k];

			if (wsc.from != null) {
				let base = wipScales[wsc.from];

				if (base.min == null)
					wsc.min = wsc.max = null;
				else {
					let minMax = wsc.range(self, base.min, base.max, k);
					wsc.min = minMax[0];
					wsc.max = minMax[1];
				}
			}
		}

		let changed = {};
		let anyChanged = false;

		for (let k in wipScales) {
			let wsc = wipScales[k];
			let sc = scales[k];

			if (sc.min != wsc.min || sc.max != wsc.max) {
				sc.min = wsc.min;
				sc.max = wsc.max;

				let distr = sc.distr;

				sc._min = distr == 3 ? log10(sc.min) : distr == 4 ? asinh(sc.min, sc.asinh) : sc.min;
				sc._max = distr == 3 ? log10(sc.max) : distr == 4 ? asinh(sc.max, sc.asinh) : sc.max;

				changed[k] = anyChanged = true;
			}
		}

		if (anyChanged) {
			// invalidate paths of all series on changed scales
			series.forEach((s, i) => {
				if (mode == 2) {
					if (i > 0 && changed.y)
						s._paths = null;
				}
				else {
					if (changed[s.scale])
						s._paths = null;
				}
			});

			for (let k in changed) {
				shouldConvergeSize = true;
				fire("setScale", k);
			}

			if (cursor.show && cursor.left >= 0)
				shouldSetCursor = shouldSetLegend = true;
		}

		for (let k in pendScales)
			pendScales[k] = null;
	}

	// grabs the nearest indices with y data outside of x-scale limits
	function getOuterIdxs(ydata) {
		let _i0 = clamp(i0 - 1, 0, dataLen - 1);
		let _i1 = clamp(i1 + 1, 0, dataLen - 1);

		while (ydata[_i0] == null && _i0 > 0)
			_i0--;

		while (ydata[_i1] == null && _i1 < dataLen - 1)
			_i1++;

		return [_i0, _i1];
	}

	function drawSeries() {
		if (dataLen > 0) {
			series.forEach((s, i) => {
				if (i > 0 && s.show) {
					FEAT_PATHS && cacheStrokeFill(i, false);
					FEAT_POINTS && cacheStrokeFill(i, true);

					if (s._paths == null) {
						let _idxs = mode == 2 ? [0, data[i][0].length - 1] : getOuterIdxs(data[i]);
						s._paths = s.paths(self, i, _idxs[0], _idxs[1]);
					}
				}
			});

			series.forEach((s, i) => {
				if (i > 0 && s.show) {
					if (ctxAlpha != s.alpha)
						ctx.globalAlpha = ctxAlpha = s.alpha;

					FEAT_PATHS && s._paths != null && drawPath(i, false);

					if (FEAT_POINTS) {
						let _gaps = s._paths != null ? s._paths.gaps : null;

						let show = s.points.show(self, i, i0, i1, _gaps);
						let idxs = s.points.filter(self, i, show, _gaps);

						if (show || idxs) {
							s.points._paths = s.points.paths(self, i, i0, i1, idxs);
							drawPath(i, true);
						}
					}

					if (ctxAlpha != 1)
						ctx.globalAlpha = ctxAlpha = 1;

					fire("drawSeries", i);
				}
			});
		}
	}

	function cacheStrokeFill(si, _points) {
		let s = _points ? series[si].points : series[si];

		s._stroke = s.stroke(self, si);
		s._fill   = s.fill(self, si);
	}

	function drawPath(si, _points) {
		let s = _points ? series[si].points : series[si];

		let {
			stroke,
			fill,
			clip: gapsClip,
			flags,

			_stroke: strokeStyle = s._stroke,
			_fill:   fillStyle   = s._fill,
			_width:  width       = s.width,
		} = s._paths;

		width = roundDec(width * pxRatio, 3);

		let boundsClip = null;
		let offset = (width % 2) / 2;

		if (_points && fillStyle == null)
			fillStyle = width > 0 ? "#fff" : strokeStyle;

		let _pxAlign = s.pxAlign == 1 && offset > 0;

		_pxAlign && ctx.translate(offset, offset);

		if (!_points) {
			let lft = plotLft - width / 2,
				top = plotTop - width / 2,
				wid = plotWid + width,
				hgt = plotHgt + width;

			boundsClip = new Path2D();
			boundsClip.rect(lft, top, wid, hgt);
		}

		// the points pathbuilder's gapsClip is its boundsClip, since points dont need gaps clipping, and bounds depend on point size
		if (_points)
			strokeFill(strokeStyle, width, s.dash, s.cap, fillStyle, stroke, fill, flags, gapsClip);
		else
			fillStroke(si, strokeStyle, width, s.dash, s.cap, fillStyle, stroke, fill, flags, boundsClip, gapsClip);

		_pxAlign && ctx.translate(-offset, -offset);
	}

	function fillStroke(si, strokeStyle, lineWidth, lineDash, lineCap, fillStyle, strokePath, fillPath, flags, boundsClip, gapsClip) {
		let didStrokeFill = false;

		// for all bands where this series is the top edge, create upwards clips using the bottom edges
		// and apply clips + fill with band fill or dfltFill
		bands.forEach((b, bi) => {
			// isUpperEdge?
			if (b.series[0] == si) {
				let lowerEdge = series[b.series[1]];
				let lowerData = data[b.series[1]];

				let bandClip = (lowerEdge._paths || EMPTY_OBJ).band;

				if (isArr(bandClip))
					bandClip = b.dir == 1 ? bandClip[0] : bandClip[1];

				let gapsClip2;

				let _fillStyle = null;

				// hasLowerEdge?
				if (lowerEdge.show && bandClip && hasData(lowerData, i0, i1)) {
					_fillStyle = b.fill(self, bi) || fillStyle;
					gapsClip2 = lowerEdge._paths.clip;
				}
				else
					bandClip = null;

				strokeFill(strokeStyle, lineWidth, lineDash, lineCap, _fillStyle, strokePath, fillPath, flags, boundsClip, gapsClip, gapsClip2, bandClip);

				didStrokeFill = true;
			}
		});

		if (!didStrokeFill)
			strokeFill(strokeStyle, lineWidth, lineDash, lineCap, fillStyle, strokePath, fillPath, flags, boundsClip, gapsClip);
	}

	const CLIP_FILL_STROKE = BAND_CLIP_FILL | BAND_CLIP_STROKE;

	function strokeFill(strokeStyle, lineWidth, lineDash, lineCap, fillStyle, strokePath, fillPath, flags, boundsClip, gapsClip, gapsClip2, bandClip) {
		setCtxStyle(strokeStyle, lineWidth, lineDash, lineCap, fillStyle);

		if (boundsClip || gapsClip || bandClip) {
			ctx.save();
			boundsClip && ctx.clip(boundsClip);
			gapsClip && ctx.clip(gapsClip);
		}

		if (bandClip) {
			if ((flags & CLIP_FILL_STROKE) == CLIP_FILL_STROKE) {
				ctx.clip(bandClip);
				gapsClip2 && ctx.clip(gapsClip2);
				doFill(fillStyle, fillPath);
				doStroke(strokeStyle, strokePath, lineWidth);
			}
			else if (flags & BAND_CLIP_STROKE) {
				doFill(fillStyle, fillPath);
				ctx.clip(bandClip);
				doStroke(strokeStyle, strokePath, lineWidth);
			}
			else if (flags & BAND_CLIP_FILL) {
				ctx.save();
				ctx.clip(bandClip);
				gapsClip2 && ctx.clip(gapsClip2);
				doFill(fillStyle, fillPath);
				ctx.restore();
				doStroke(strokeStyle, strokePath, lineWidth);
			}
		}
		else {
			doFill(fillStyle, fillPath);
			doStroke(strokeStyle, strokePath, lineWidth);
		}

		if (boundsClip || gapsClip || bandClip)
			ctx.restore();
	}

	function doStroke(strokeStyle, strokePath, lineWidth) {
		if (lineWidth > 0) {
			if (strokePath instanceof Map) {
				strokePath.forEach((strokePath, strokeStyle) => {
					ctx.strokeStyle = ctxStroke = strokeStyle;
					ctx.stroke(strokePath);
				});
			}
			else
				strokePath != null && strokeStyle && ctx.stroke(strokePath);
		}
	}

	function doFill(fillStyle, fillPath) {
		if (fillPath instanceof Map) {
			fillPath.forEach((fillPath, fillStyle) => {
				ctx.fillStyle = ctxFill = fillStyle;
				ctx.fill(fillPath);
			});
		}
		else
			fillPath != null && fillStyle && ctx.fill(fillPath);
	}

	function getIncrSpace(axisIdx, min, max, fullDim) {
		let axis = axes[axisIdx];

		let incrSpace;

		if (fullDim <= 0)
			incrSpace = [0, 0];
		else {
			let minSpace = axis._space = axis.space(self, axisIdx, min, max, fullDim);
			let incrs    = axis._incrs = axis.incrs(self, axisIdx, min, max, fullDim, minSpace);
			incrSpace    = findIncr(min, max, incrs, fullDim, minSpace);
		}

		return (axis._found = incrSpace);
	}

	function drawOrthoLines(offs, filts, ori, side, pos0, len, width, stroke, dash, cap) {
		let offset = (width % 2) / 2;

		pxAlign == 1 && ctx.translate(offset, offset);

		setCtxStyle(stroke, width, dash, cap, stroke);

		ctx.beginPath();

		let x0, y0, x1, y1, pos1 = pos0 + (side == 0 || side == 3 ? -len : len);

		if (ori == 0) {
			y0 = pos0;
			y1 = pos1;
		}
		else {
			x0 = pos0;
			x1 = pos1;
		}

		for (let i = 0; i < offs.length; i++) {
			if (filts[i] != null) {
				if (ori == 0)
					x0 = x1 = offs[i];
				else
					y0 = y1 = offs[i];

				ctx.moveTo(x0, y0);
				ctx.lineTo(x1, y1);
			}
		}

		ctx.stroke();

		pxAlign == 1 && ctx.translate(-offset, -offset);
	}

	function axesCalc(cycleNum) {
	//	log("axesCalc()", arguments);

		let converged = true;

		axes.forEach((axis, i) => {
			if (!axis.show)
				return;

			let scale = scales[axis.scale];

			if (scale.min == null) {
				if (axis._show) {
					converged = false;
					axis._show = false;
					resetYSeries(false);
				}
				return;
			}
			else {
				if (!axis._show) {
					converged = false;
					axis._show = true;
					resetYSeries(false);
				}
			}

			let side = axis.side;
			let ori = side % 2;

			let {min, max} = scale;		// 		// should this toggle them ._show = false

			let [_incr, _space] = getIncrSpace(i, min, max, ori == 0 ? plotWidCss : plotHgtCss);

			if (_space == 0)
				return;

			// if we're using index positions, force first tick to match passed index
			let forceMin = scale.distr == 2;

			let _splits = axis._splits = axis.splits(self, i, min, max, _incr, _space, forceMin);

			// tick labels
			// BOO this assumes a specific data/series
			let splits = scale.distr == 2 ? _splits.map(i => data0[i]) : _splits;
			let incr   = scale.distr == 2 ? data0[_splits[1]] - data0[_splits[0]] : _incr;

			let values = axis._values = axis.values(self, axis.filter(self, splits, i, _space, incr), i, _space, incr);

			// rotating of labels only supported on bottom x axis
			axis._rotate = side == 2 ? axis.rotate(self, values, i, _space) : 0;

			let oldSize = axis._size;

			axis._size = ceil(axis.size(self, values, i, cycleNum));

			if (oldSize != null && axis._size != oldSize)			// ready && ?
				converged = false;
		});

		return converged;
	}

	function paddingCalc(cycleNum) {
		let converged = true;

		padding.forEach((p, i) => {
			let _p = p(self, i, sidesWithAxes, cycleNum);

			if (_p != _padding[i])
				converged = false;

			_padding[i] = _p;
		});

		return converged;
	}

	function drawAxesGrid() {
		for (let i = 0; i < axes.length; i++) {
			let axis = axes[i];

			if (!axis.show || !axis._show)
				continue;

			let side = axis.side;
			let ori = side % 2;

			let x, y;

			let fillStyle = axis.stroke(self, i);

			let shiftDir = side == 0 || side == 3 ? -1 : 1;

			// axis label
			if (axis.label) {
				let shiftAmt = axis.labelGap * shiftDir;
				let baseLpos = round((axis._lpos + shiftAmt) * pxRatio);

				setFontStyle(axis.labelFont[0], fillStyle, "center", side == 2 ? TOP : BOTTOM);

				ctx.save();

				if (ori == 1) {
					x = y = 0;

					ctx.translate(
						baseLpos,
						round(plotTop + plotHgt / 2),
					);
					ctx.rotate((side == 3 ? -PI : PI) / 2);

				}
				else {
					x = round(plotLft + plotWid / 2);
					y = baseLpos;
				}

				ctx.fillText(axis.label, x, y);

				ctx.restore();
			}

			let [_incr, _space] = axis._found;

			if (_space == 0)
				continue;

			let scale = scales[axis.scale];

			let plotDim = ori == 0 ? plotWid : plotHgt;
			let plotOff = ori == 0 ? plotLft : plotTop;

			let axisGap = round(axis.gap * pxRatio);

			let _splits = axis._splits;

			// tick labels
			// BOO this assumes a specific data/series
			let splits = scale.distr == 2 ? _splits.map(i => data0[i]) : _splits;
			let incr   = scale.distr == 2 ? data0[_splits[1]] - data0[_splits[0]] : _incr;

			let ticks = axis.ticks;
			let border = axis.border;
			let tickSize = ticks.show ? round(ticks.size * pxRatio) : 0;

			// rotating of labels only supported on bottom x axis
			let angle = axis._rotate * -PI/180;

			let basePos  = pxRound(axis._pos * pxRatio);
			let shiftAmt = (tickSize + axisGap) * shiftDir;
			let finalPos = basePos + shiftAmt;
			    y        = ori == 0 ? finalPos : 0;
			    x        = ori == 1 ? finalPos : 0;

			let font         = axis.font[0];
			let textAlign    = axis.align == 1 ? LEFT :
			                   axis.align == 2 ? RIGHT :
			                   angle > 0 ? LEFT :
			                   angle < 0 ? RIGHT :
			                   ori == 0 ? "center" : side == 3 ? RIGHT : LEFT;
			let textBaseline = angle ||
			                   ori == 1 ? "middle" : side == 2 ? TOP   : BOTTOM;

			setFontStyle(font, fillStyle, textAlign, textBaseline);

			let lineHeight = axis.font[1] * axis.lineGap;

			let canOffs = _splits.map(val => pxRound(getPos(val, scale, plotDim, plotOff)));

			let _values = axis._values;

			for (let i = 0; i < _values.length; i++) {
				let val = _values[i];

				if (val != null) {
					if (ori == 0)
						x = canOffs[i];
					else
						y = canOffs[i];

					val = "" + val;

					let _parts = val.indexOf("\n") == -1 ? [val] : val.split(/\n/gm);

					for (let j = 0; j < _parts.length; j++) {
						let text = _parts[j];

						if (angle) {
							ctx.save();
							ctx.translate(x, y + j * lineHeight); // can this be replaced with position math?
							ctx.rotate(angle); // can this be done once?
							ctx.fillText(text, 0, 0);
							ctx.restore();
						}
						else
							ctx.fillText(text, x, y + j * lineHeight);
					}
				}
			}

			// ticks
			if (ticks.show) {
				drawOrthoLines(
					canOffs,
					ticks.filter(self, splits, i, _space, incr),
					ori,
					side,
					basePos,
					tickSize,
					roundDec(ticks.width * pxRatio, 3),
					ticks.stroke(self, i),
					ticks.dash,
					ticks.cap,
				);
			}

			// grid
			let grid = axis.grid;

			if (grid.show) {
				drawOrthoLines(
					canOffs,
					grid.filter(self, splits, i, _space, incr),
					ori,
					ori == 0 ? 2 : 1,
					ori == 0 ? plotTop : plotLft,
					ori == 0 ? plotHgt : plotWid,
					roundDec(grid.width * pxRatio, 3),
					grid.stroke(self, i),
					grid.dash,
					grid.cap,
				);
			}

			if (border.show) {
				drawOrthoLines(
					[basePos],
					[1],
					ori == 0 ? 1 : 0,
					ori == 0 ? 1 : 2,
					ori == 1 ? plotTop : plotLft,
					ori == 1 ? plotHgt : plotWid,
					roundDec(border.width * pxRatio, 3),
					border.stroke(self, i),
					border.dash,
					border.cap,
				);
			}
		}

		fire("drawAxes");
	}

	function resetYSeries(minMax) {
	//	log("resetYSeries()", arguments);

		series.forEach((s, i) => {
			if (i > 0) {
				s._paths = null;

				if (minMax) {
					if (mode == 1) {
						s.min = null;
						s.max = null;
					}
					else {
						s.facets.forEach(f => {
							f.min = null;
							f.max = null;
						});
					}
				}
			}
		});
	}

	let queuedCommit = false;

	function commit() {
		if (!queuedCommit) {
			microTask(_commit);
			queuedCommit = true;
		}
	}

	function _commit() {
	//	log("_commit()", arguments);

		if (shouldSetScales) {
			setScales();
			shouldSetScales = false;
		}

		if (shouldConvergeSize) {
			convergeSize();
			shouldConvergeSize = false;
		}

		if (shouldSetSize) {
			setStylePx(under, LEFT,   plotLftCss);
			setStylePx(under, TOP,    plotTopCss);
			setStylePx(under, WIDTH,  plotWidCss);
			setStylePx(under, HEIGHT, plotHgtCss);

			setStylePx(over, LEFT,    plotLftCss);
			setStylePx(over, TOP,     plotTopCss);
			setStylePx(over, WIDTH,   plotWidCss);
			setStylePx(over, HEIGHT,  plotHgtCss);

			setStylePx(wrap, WIDTH,   fullWidCss);
			setStylePx(wrap, HEIGHT,  fullHgtCss);

			// NOTE: mutating this during print preview in Chrome forces transparent
			// canvas pixels to white, even when followed up with clearRect() below
			can.width  = round(fullWidCss * pxRatio);
			can.height = round(fullHgtCss * pxRatio);

			axes.forEach(({ _el, _show, _size, _pos, side }) => {
				if (_el != null) {
					if (_show) {
						let posOffset = (side === 3 || side === 0 ? _size : 0);
						let isVt = side % 2 == 1;

						setStylePx(_el, isVt ? "left"   : "top",    _pos - posOffset);
						setStylePx(_el, isVt ? "width"  : "height", _size);
						setStylePx(_el, isVt ? "top"    : "left",   isVt ? plotTopCss : plotLftCss);
						setStylePx(_el, isVt ? "height" : "width",  isVt ? plotHgtCss : plotWidCss);

						remClass(_el, OFF);
					}
					else
						addClass(_el, OFF);
				}
			});

			// invalidate ctx style cache
			ctxStroke = ctxFill = ctxWidth = ctxJoin = ctxCap = ctxFont = ctxAlign = ctxBaseline = ctxDash = null;
			ctxAlpha = 1;

			syncRect(true);

			fire("setSize");

			shouldSetSize = false;
		}

		if (fullWidCss > 0 && fullHgtCss > 0) {
			ctx.clearRect(0, 0, can.width, can.height);
			fire("drawClear");
			drawOrder.forEach(fn => fn());
			fire("draw");
		}

		if (select.show && shouldSetSelect) {
			setSelect(select);
			shouldSetSelect = false;
		}

		if (cursor.show && shouldSetCursor) {
			updateCursor(null, true, false);
			shouldSetCursor = false;
		}

		if (FEAT_LEGEND && legend.show && legend.live && shouldSetLegend) {
			setLegend();
			shouldSetLegend = false; // redundant currently
		}

		if (!ready) {
			ready = true;
			self.status = 1;

			fire("ready");
		}

		viaAutoScaleX = false;

		queuedCommit = false;
	}

	self.redraw = (rebuildPaths, recalcAxes) => {
		shouldConvergeSize = recalcAxes || false;

		if (rebuildPaths !== false)
			_setScale(xScaleKey, scaleX.min, scaleX.max);
		else
			commit();
	};

	// redraw() => setScale('x', scales.x.min, scales.x.max);

	// explicit, never re-ranged (is this actually true? for x and y)
	function setScale(key, opts) {
		let sc = scales[key];

		if (sc.from == null) {
			if (dataLen == 0) {
				let minMax = sc.range(self, opts.min, opts.max, key);
				opts.min = minMax[0];
				opts.max = minMax[1];
			}

			if (opts.min > opts.max) {
				let _min = opts.min;
				opts.min = opts.max;
				opts.max = _min;
			}

			if (dataLen > 1 && opts.min != null && opts.max != null && opts.max - opts.min < 1e-16)
				return;

			if (key == xScaleKey) {
				if (sc.distr == 2 && dataLen > 0) {
					opts.min = closestIdx(opts.min, data[0]);
					opts.max = closestIdx(opts.max, data[0]);

					if (opts.min == opts.max)
						opts.max++;
				}
			}

		//	log("setScale()", arguments);

			pendScales[key] = opts;

			shouldSetScales = true;
			commit();
		}
	}

	self.setScale = setScale;

//	INTERACTION

	let xCursor;
	let yCursor;
	let vCursor;
	let hCursor;

	// starting position before cursor.move
	let rawMouseLeft0;
	let rawMouseTop0;

	// starting position
	let mouseLeft0;
	let mouseTop0;

	// current position before cursor.move
	let rawMouseLeft1;
	let rawMouseTop1;

	// current position
	let mouseLeft1;
	let mouseTop1;

	let dragging = false;

	const drag = cursor.drag;

	let dragX = drag.x;
	let dragY = drag.y;

	if (cursor.show) {
		if (cursor.x)
			xCursor = placeDiv(CURSOR_X, over);
		if (cursor.y)
			yCursor = placeDiv(CURSOR_Y, over);

		if (scaleX.ori == 0) {
			vCursor = xCursor;
			hCursor = yCursor;
		}
		else {
			vCursor = yCursor;
			hCursor = xCursor;
		}

		mouseLeft1 = cursor.left;
		mouseTop1 = cursor.top;
	}

	const select = self.select = assign({
		show:   true,
		over:   true,
		left:   0,
		width:  0,
		top:    0,
		height: 0,
	}, opts.select);

	const selectDiv = select.show ? placeDiv(SELECT, select.over ? over : under) : null;

	function setSelect(opts, _fire) {
		if (select.show) {
			for (let prop in opts) {
				select[prop] = opts[prop];

				if (prop in _hideProps)
					setStylePx(selectDiv, prop, opts[prop]);
			}

			_fire !== false && fire("setSelect");
		}
	}

	self.setSelect = setSelect;

	function toggleDOM(i, onOff) {
		let s = series[i];
		let label = showLegend ? legendRows[i] : null;

		if (s.show)
			label && remClass(label, OFF);
		else {
			label && addClass(label, OFF);
			cursorPts.length > 1 && elTrans(cursorPts[i], -10, -10, plotWidCss, plotHgtCss);
		}
	}

	function _setScale(key, min, max) {
		setScale(key, {min, max});
	}

	function setSeries(i, opts, _fire, _pub) {
	//	log("setSeries()", arguments);

		if (opts.focus != null)
			setFocus(i);

		if (opts.show != null) {
			series.forEach((s, si) => {
				if (si > 0 && (i == si || i == null)) {
					s.show = opts.show;
					FEAT_LEGEND && toggleDOM(si, opts.show);

					_setScale(mode == 2 ? s.facets[1].scale : s.scale, null, null);
					commit();
				}
			});
		}

		_fire !== false && fire("setSeries", i, opts);

		_pub && pubSync("setSeries", self, i, opts);
	}

	self.setSeries = setSeries;

	function setBand(bi, opts) {
		assign(bands[bi], opts);
	}

	function addBand(opts, bi) {
		opts.fill = fnOrSelf(opts.fill || null);
		opts.dir = ifNull(opts.dir, -1);
		bi = bi == null ? bands.length : bi;
		bands.splice(bi, 0, opts);
	}

	function delBand(bi) {
		if (bi == null)
			bands.length = 0;
		else
			bands.splice(bi, 1);
	}

	self.addBand = addBand;
	self.setBand = setBand;
	self.delBand = delBand;

	function setAlpha(i, value) {
		series[i].alpha = value;

		if (cursor.show && cursorPts[i])
			cursorPts[i].style.opacity = value;

		if (FEAT_LEGEND && showLegend && legendRows[i])
			legendRows[i].style.opacity = value;
	}

	// y-distance
	let closestDist;
	let closestSeries;
	let focusedSeries;
	const FOCUS_TRUE  = {focus: true};

	function setFocus(i) {
		if (i != focusedSeries) {
		//	log("setFocus()", arguments);

			let allFocused = i == null;

			let _setAlpha = focus.alpha != 1;

			series.forEach((s, i2) => {
				let isFocused = allFocused || i2 == 0 || i2 == i;
				s._focus = allFocused ? null : isFocused;
				_setAlpha && setAlpha(i2, isFocused ? 1 : focus.alpha);
			});

			focusedSeries = i;
			_setAlpha && commit();
		}
	}

	if (showLegend && cursorFocus) {
		onMouse(mouseleave, legendTable, e => {
			if (cursor._lock)
				return;

			setCursorEvent(e);

			if (focusedSeries != null)
				setSeries(null, FOCUS_TRUE, true, syncOpts.setSeries);
		});
	}

	function posToVal(pos, scale, can) {
		let sc = scales[scale];

		if (can)
			pos = pos / pxRatio - (sc.ori == 1 ? plotTopCss : plotLftCss);

		let dim = plotWidCss;

		if (sc.ori == 1) {
			dim = plotHgtCss;
			pos = dim - pos;
		}

		if (sc.dir == -1)
			pos = dim - pos;

		let _min = sc._min,
			_max = sc._max,
			pct = pos / dim;

		let sv = _min + (_max - _min) * pct;

		let distr = sc.distr;

		return (
			distr == 3 ? pow(10, sv) :
			distr == 4 ? sinh(sv, sc.asinh) :
			sv
		);
	}

	function closestIdxFromXpos(pos, can) {
		let v = posToVal(pos, xScaleKey, can);
		return closestIdx(v, data[0], i0, i1);
	}

	self.valToIdx = val => closestIdx(val, data[0]);
	self.posToIdx = closestIdxFromXpos;
	self.posToVal = posToVal;
	self.valToPos = (val, scale, can) => (
		scales[scale].ori == 0 ?
		getHPos(val, scales[scale],
			can ? plotWid : plotWidCss,
			can ? plotLft : 0,
		) :
		getVPos(val, scales[scale],
			can ? plotHgt : plotHgtCss,
			can ? plotTop : 0,
		)
	);

	// defers calling expensive functions
	function batch(fn) {
		fn(self);
		commit();
	}

	self.batch = batch;

	self.setCursor = (opts, _fire, _pub) => {
		mouseLeft1 = opts.left;
		mouseTop1 = opts.top;
	//	assign(cursor, opts);
		updateCursor(null, _fire, _pub);
	};

	function setSelH(off, dim) {
		setStylePx(selectDiv, LEFT,  select.left = off);
		setStylePx(selectDiv, WIDTH, select.width = dim);
	}

	function setSelV(off, dim) {
		setStylePx(selectDiv, TOP,    select.top = off);
		setStylePx(selectDiv, HEIGHT, select.height = dim);
	}

	let setSelX = scaleX.ori == 0 ? setSelH : setSelV;
	let setSelY = scaleX.ori == 1 ? setSelH : setSelV;

	function syncLegend() {
		if (showLegend && legend.live) {
			for (let i = mode == 2 ? 1 : 0; i < series.length; i++) {
				if (i == 0 && multiValLegend)
					continue;

				let vals = legend.values[i];

				let j = 0;

				for (let k in vals)
					legendCells[i][j++].firstChild.nodeValue = vals[k];
			}
		}
	}

	function setLegend(opts, _fire) {
		if (opts != null) {
			if (opts.idxs) {
				opts.idxs.forEach((didx, sidx) => {
					activeIdxs[sidx] = didx;
				});
			}
			else if (!isUndef(opts.idx))
				activeIdxs.fill(opts.idx);

			legend.idx = activeIdxs[0];
		}

		for (let sidx = 0; sidx < series.length; sidx++) {
			if (sidx > 0 || mode == 1 && !multiValLegend)
				setLegendValues(sidx, activeIdxs[sidx]);
		}

		if (showLegend && legend.live)
			syncLegend();

		shouldSetLegend = false;

		_fire !== false && fire("setLegend");
	}

	self.setLegend = setLegend;

	function setLegendValues(sidx, idx) {
		let s = series[sidx];
		let src = sidx == 0 && xScaleDistr == 2 ? data0 : data[sidx];
		let val;

		if (multiValLegend)
			val = s.values(self, sidx, idx) ?? NULL_LEGEND_VALUES;
		else {
			val = s.value(self, idx == null ? null : src[idx], sidx, idx);
			val = val == null ? NULL_LEGEND_VALUES : {_: val};
		}

		legend.values[sidx] = val;
	}

	function updateCursor(src, _fire, _pub) {
	//	ts == null && log("updateCursor()", arguments);

		rawMouseLeft1 = mouseLeft1;
		rawMouseTop1 = mouseTop1;

		[mouseLeft1, mouseTop1] = cursor.move(self, mouseLeft1, mouseTop1);

		if (cursor.show) {
			vCursor && elTrans(vCursor, round(mouseLeft1), 0, plotWidCss, plotHgtCss);
			hCursor && elTrans(hCursor, 0, round(mouseTop1), plotWidCss, plotHgtCss);
		}

		let idx;

		// when zooming to an x scale range between datapoints the binary search
		// for nearest min/max indices results in this condition. cheap hack :D
		let noDataInRange = i0 > i1; // works for mode 1 only

		closestDist = inf;

		// TODO: extract
		let xDim = scaleX.ori == 0 ? plotWidCss : plotHgtCss;
		let yDim = scaleX.ori == 1 ? plotWidCss : plotHgtCss;

		// if cursor hidden, hide points & clear legend vals
		if (mouseLeft1 < 0 || dataLen == 0 || noDataInRange) {
			idx = null;

			for (let i = 0; i < series.length; i++) {
				if (i > 0) {
					cursorPts.length > 1 && elTrans(cursorPts[i], -10, -10, plotWidCss, plotHgtCss);
				}
			}

			if (cursorFocus)
				setSeries(null, FOCUS_TRUE, true, src == null && syncOpts.setSeries);

			if (FEAT_LEGEND && legend.live) {
				activeIdxs.fill(idx);
				shouldSetLegend = true;
			}
		}
		else {
		//	let pctY = 1 - (y / rect.height);

			let mouseXPos, valAtPosX, xPos;

			if (mode == 1) {
				mouseXPos = scaleX.ori == 0 ? mouseLeft1 : mouseTop1;
				valAtPosX = posToVal(mouseXPos, xScaleKey);
				idx = closestIdx(valAtPosX, data[0], i0, i1);
				xPos = valToPosX(data[0][idx], scaleX, xDim, 0);
			}

			for (let i = mode == 2 ? 1 : 0; i < series.length; i++) {
				let s = series[i];

				let idx1  = activeIdxs[i];
				let yVal1 = mode == 1 ? data[i][idx1] : data[i][1][idx1];

				let idx2  = cursor.dataIdx(self, i, idx, valAtPosX);
				let yVal2 = mode == 1 ? data[i][idx2] : data[i][1][idx2];

				shouldSetLegend = shouldSetLegend || yVal2 != yVal1 || idx2 != idx1;

				activeIdxs[i] = idx2;

				let xPos2 = incrRoundUp(idx2 == idx ? xPos : valToPosX(mode == 1 ? data[0][idx2] : data[i][0][idx2], scaleX, xDim, 0), 1);

				if (i > 0 && s.show) {
					let yPos = yVal2 == null ? -10 : incrRoundUp(valToPosY(yVal2, mode == 1 ? scales[s.scale] : scales[s.facets[1].scale], yDim, 0), 1);

					if (cursorFocus && yPos >= 0 && mode == 1) {
						let dist = abs(yPos - mouseTop1);

						if (dist < closestDist) {
							let bias = focus.bias;

							if (bias != 0) {
								let mouseYPos = scaleX.ori == 1 ? mouseLeft1 : mouseTop1;
								let mouseYVal = posToVal(mouseYPos, s.scale);

								let seriesYValSign = yVal2     >= 0 ? 1 : -1;
								let mouseYValSign  = mouseYVal >= 0 ? 1 : -1;

								// with a focus bias, we will never cross zero when prox testing
								// it's either closest towards zero, or closest away from zero
								if (mouseYValSign == seriesYValSign && (
									mouseYValSign == 1 ?
										(bias == 1 ? yVal2 >= mouseYVal : yVal2 <= mouseYVal) :  // >= 0
										(bias == 1 ? yVal2 <= mouseYVal : yVal2 >= mouseYVal)    //  < 0
								)) {
									closestDist = dist;
									closestSeries = i;
								}
							}
							else {
								closestDist = dist;
								closestSeries = i;
							}
						}
					}

					let hPos, vPos;

					if (scaleX.ori == 0) {
						hPos = xPos2;
						vPos = yPos;
					}
					else {
						hPos = yPos;
						vPos = xPos2;
					}

					if (shouldSetLegend && cursorPts.length > 1) {
						elColor(cursorPts[i], cursor.points.fill(self, i), cursor.points.stroke(self, i));

						let ptWid, ptHgt, ptLft, ptTop,
							centered = true,
							getBBox = cursor.points.bbox;

						if (getBBox != null) {
							centered = false;

							let bbox = getBBox(self, i);

							ptLft = bbox.left;
							ptTop = bbox.top;
							ptWid = bbox.width;
							ptHgt = bbox.height;
						}
						else {
							ptLft = hPos;
							ptTop = vPos;
							ptWid = ptHgt = cursor.points.size(self, i);
						}

						elSize(cursorPts[i], ptWid, ptHgt, centered);
						elTrans(cursorPts[i], ptLft, ptTop, plotWidCss, plotHgtCss);
					}
				}
			}
		}

		cursor.idx = idx;
		cursor.left = mouseLeft1;
		cursor.top = mouseTop1;

		if (shouldSetLegend) {
			legend.idx = idx;
			setLegend();
		}

		// nit: cursor.drag.setSelect is assumed always true
		if (select.show && dragging) {
			if (src != null) {
				let [xKey, yKey] = syncOpts.scales;
				let [matchXKeys, matchYKeys] = syncOpts.match;
				let [xKeySrc, yKeySrc] = src.cursor.sync.scales;

				// match the dragX/dragY implicitness/explicitness of src
				let sdrag = src.cursor.drag;
				dragX = sdrag._x;
				dragY = sdrag._y;

				if (dragX || dragY) {
					let { left, top, width, height } = src.select;

					let sori = src.scales[xKey].ori;
					let sPosToVal = src.posToVal;

					let sOff, sDim, sc, a, b;

					let matchingX = xKey != null && matchXKeys(xKey, xKeySrc);
					let matchingY = yKey != null && matchYKeys(yKey, yKeySrc);

					if (matchingX && dragX) {
						if (sori == 0) {
							sOff = left;
							sDim = width;
						}
						else {
							sOff = top;
							sDim = height;
						}

						sc = scales[xKey];

						a = valToPosX(sPosToVal(sOff, xKeySrc),        sc, xDim, 0);
						b = valToPosX(sPosToVal(sOff + sDim, xKeySrc), sc, xDim, 0);

						setSelX(min(a,b), abs(b-a));
					}
					else
						setSelX(0, xDim);

					if (matchingY && dragY) {
						if (sori == 1) {
							sOff = left;
							sDim = width;
						}
						else {
							sOff = top;
							sDim = height;
						}

						sc = scales[yKey];

						a = valToPosY(sPosToVal(sOff, yKeySrc),        sc, yDim, 0);
						b = valToPosY(sPosToVal(sOff + sDim, yKeySrc), sc, yDim, 0);

						setSelY(min(a,b), abs(b-a));
					}
					else
						setSelY(0, yDim);
				}
				else
					hideSelect();
			}
			else {
				let rawDX = abs(rawMouseLeft1 - rawMouseLeft0);
				let rawDY = abs(rawMouseTop1 - rawMouseTop0);

				if (scaleX.ori == 1) {
					let _rawDX = rawDX;
					rawDX = rawDY;
					rawDY = _rawDX;
				}

				dragX = drag.x && rawDX >= drag.dist;
				dragY = drag.y && rawDY >= drag.dist;

				let uni = drag.uni;

				if (uni != null) {
					// only calc drag status if they pass the dist thresh
					if (dragX && dragY) {
						dragX = rawDX >= uni;
						dragY = rawDY >= uni;

						// force unidirectionality when both are under uni limit
						if (!dragX && !dragY) {
							if (rawDY > rawDX)
								dragY = true;
							else
								dragX = true;
						}
					}
				}
				else if (drag.x && drag.y && (dragX || dragY))
					// if omni with no uni then both dragX / dragY should be true if either is true
					dragX = dragY = true;

				let p0, p1;

				if (dragX) {
					if (scaleX.ori == 0) {
						p0 = mouseLeft0;
						p1 = mouseLeft1;
					}
					else {
						p0 = mouseTop0;
						p1 = mouseTop1;
					}

					setSelX(min(p0, p1), abs(p1 - p0));

					if (!dragY)
						setSelY(0, yDim);
				}

				if (dragY) {
					if (scaleX.ori == 1) {
						p0 = mouseLeft0;
						p1 = mouseLeft1;
					}
					else {
						p0 = mouseTop0;
						p1 = mouseTop1;
					}

					setSelY(min(p0, p1), abs(p1 - p0));

					if (!dragX)
						setSelX(0, xDim);
				}

				// the drag didn't pass the dist requirement
				if (!dragX && !dragY) {
					setSelX(0, 0);
					setSelY(0, 0);
				}
			}
		}

		drag._x = dragX;
		drag._y = dragY;

		if (src == null) {
			if (_pub) {
				if (syncKey != null) {
					let [xSyncKey, ySyncKey] = syncOpts.scales;

					syncOpts.values[0] = xSyncKey != null ? posToVal(scaleX.ori == 0 ? mouseLeft1 : mouseTop1, xSyncKey) : null;
					syncOpts.values[1] = ySyncKey != null ? posToVal(scaleX.ori == 1 ? mouseLeft1 : mouseTop1, ySyncKey) : null;
				}

				pubSync(mousemove, self, mouseLeft1, mouseTop1, plotWidCss, plotHgtCss, idx);
			}

			if (cursorFocus) {
				let shouldPub = _pub && syncOpts.setSeries;
				let p = focus.prox;

				if (focusedSeries == null) {
					if (closestDist <= p)
						setSeries(closestSeries, FOCUS_TRUE, true, shouldPub);
				}
				else {
					if (closestDist > p)
						setSeries(null, FOCUS_TRUE, true, shouldPub);
					else if (closestSeries != focusedSeries)
						setSeries(closestSeries, FOCUS_TRUE, true, shouldPub);
				}
			}
		}

		_fire !== false && fire("setCursor");
	}

	let rect = null;

	Object.defineProperty(self, 'rect', {
		get() {
			if (rect == null)
				syncRect(false);

			return rect;
		},
	});

	function syncRect(defer = false) {
		if (defer)
			rect = null;
		else {
			rect = over.getBoundingClientRect();
			fire("syncRect", rect);
		}
	}

	function mouseMove(e, src, _l, _t, _w, _h, _i) {
		if (cursor._lock)
			return;

		// Chrome on Windows has a bug which triggers a stray mousemove event after an initial mousedown event
		// when clicking into a plot as part of re-focusing the browser window.
		// we gotta ignore it to avoid triggering a phantom drag / setSelect
		// However, on touch-only devices Chrome-based browsers trigger a 0-distance mousemove before mousedown
		// so we don't ignore it when mousedown has set the dragging flag
		if (dragging && e != null && e.movementX == 0 && e.movementY == 0)
			return;

		cacheMouse(e, src, _l, _t, _w, _h, _i, false, e != null);

		if (e != null)
			updateCursor(null, true, true);
		else
			updateCursor(src, true, false);
	}

	function cacheMouse(e, src, _l, _t, _w, _h, _i, initial, snap) {
		if (rect == null)
			syncRect(false);

		setCursorEvent(e);

		if (e != null) {
			_l = e.clientX - rect.left;
			_t = e.clientY - rect.top;
		}
		else {
			if (_l < 0 || _t < 0) {
				mouseLeft1 = -10;
				mouseTop1 = -10;
				return;
			}

			let [xKey, yKey] = syncOpts.scales;

			let syncOptsSrc = src.cursor.sync;
			let [xValSrc, yValSrc] = syncOptsSrc.values;
			let [xKeySrc, yKeySrc] = syncOptsSrc.scales;
			let [matchXKeys, matchYKeys] = syncOpts.match;

			let rotSrc = src.axes[0].side % 2 == 1;

			let xDim = scaleX.ori == 0 ? plotWidCss : plotHgtCss,
				yDim = scaleX.ori == 1 ? plotWidCss : plotHgtCss,
				_xDim = rotSrc ? _h : _w,
				_yDim = rotSrc ? _w : _h,
				_xPos = rotSrc ? _t : _l,
				_yPos = rotSrc ? _l : _t;

			if (xKeySrc != null)
				_l = matchXKeys(xKey, xKeySrc) ? getPos(xValSrc, scales[xKey], xDim, 0) : -10;
			else
				_l = xDim * (_xPos/_xDim);

			if (yKeySrc != null)
				_t = matchYKeys(yKey, yKeySrc) ? getPos(yValSrc, scales[yKey], yDim, 0) : -10;
			else
				_t = yDim * (_yPos/_yDim);

			if (scaleX.ori == 1) {
				let __l = _l;
				_l = _t;
				_t = __l;
			}
		}

		if (snap) {
			if (_l <= 1 || _l >= plotWidCss - 1)
				_l = incrRound(_l, plotWidCss);

			if (_t <= 1 || _t >= plotHgtCss - 1)
				_t = incrRound(_t, plotHgtCss);
		}

		if (initial) {
			rawMouseLeft0 = _l;
			rawMouseTop0 = _t;

			[mouseLeft0, mouseTop0] = cursor.move(self, _l, _t);
		}
		else {
			mouseLeft1 = _l;
			mouseTop1 = _t;
		}
	}

	const _hideProps = {
		width: 0,
		height: 0,
		left: 0,
		top: 0,
	};

	function hideSelect() {
		setSelect(_hideProps, false);
	}

	let downSelectLeft;
	let downSelectTop;
	let downSelectWidth;
	let downSelectHeight;

	function mouseDown(e, src, _l, _t, _w, _h, _i) {
		dragging = true;
		dragX = dragY = drag._x = drag._y = false;

		cacheMouse(e, src, _l, _t, _w, _h, _i, true, false);

		if (e != null) {
			onMouse(mouseup, doc, mouseUp, false);
			pubSync(mousedown, self, mouseLeft0, mouseTop0, plotWidCss, plotHgtCss, null);
		}

		let { left, top, width, height } = select;

		downSelectLeft   = left;
		downSelectTop    = top;
		downSelectWidth  = width;
		downSelectHeight = height;

		hideSelect();
	}

	function mouseUp(e, src, _l, _t, _w, _h, _i) {
		dragging = drag._x = drag._y = false;

		cacheMouse(e, src, _l, _t, _w, _h, _i, false, true);

		let { left, top, width, height } = select;

		let hasSelect = width > 0 || height > 0;
		let chgSelect = (
			downSelectLeft   != left   ||
			downSelectTop    != top    ||
			downSelectWidth  != width  ||
			downSelectHeight != height
		);

		hasSelect && chgSelect && setSelect(select);

		if (drag.setScale && hasSelect && chgSelect) {
		//	if (syncKey != null) {
		//		dragX = drag.x;
		//		dragY = drag.y;
		//	}

			let xOff = left,
				xDim = width,
				yOff = top,
				yDim = height;

			if (scaleX.ori == 1) {
				xOff = top,
				xDim = height,
				yOff = left,
				yDim = width;
			}

			if (dragX) {
				_setScale(xScaleKey,
					posToVal(xOff, xScaleKey),
					posToVal(xOff + xDim, xScaleKey)
				);
			}

			if (dragY) {
				for (let k in scales) {
					let sc = scales[k];

					if (k != xScaleKey && sc.from == null && sc.min != inf) {
						_setScale(k,
							posToVal(yOff + yDim, k),
							posToVal(yOff, k)
						);
					}
				}
			}

			hideSelect();
		}
		else if (cursor.lock) {
			cursor._lock = !cursor._lock;

			if (!cursor._lock)
				updateCursor(null, true, false);
		}

		if (e != null) {
			offMouse(mouseup, doc, mouseUp);
			pubSync(mouseup, self, mouseLeft1, mouseTop1, plotWidCss, plotHgtCss, null);
		}
	}

	function mouseLeave(e, src, _l, _t, _w, _h, _i) {
		if (cursor._lock)
			return;

		setCursorEvent(e);

		let _dragging = dragging;

		if (dragging) {
			// handle case when mousemove aren't fired all the way to edges by browser
			let snapH = true;
			let snapV = true;
			let snapProx = 10;

			let dragH, dragV;

			if (scaleX.ori == 0) {
				dragH = dragX;
				dragV = dragY;
			}
			else {
				dragH = dragY;
				dragV = dragX;
			}

			if (dragH && dragV) {
				// maybe omni corner snap
				snapH = mouseLeft1 <= snapProx || mouseLeft1 >= plotWidCss - snapProx;
				snapV = mouseTop1  <= snapProx || mouseTop1  >= plotHgtCss - snapProx;
			}

			if (dragH && snapH)
				mouseLeft1 = mouseLeft1 < mouseLeft0 ? 0 : plotWidCss;

			if (dragV && snapV)
				mouseTop1 = mouseTop1 < mouseTop0 ? 0 : plotHgtCss;

			updateCursor(null, true, true);

			dragging = false;
		}

		mouseLeft1 = -10;
		mouseTop1 = -10;

		// passing a non-null timestamp to force sync/mousemove event
		updateCursor(null, true, true);

		if (_dragging)
			dragging = _dragging;
	}

	function dblClick(e, src, _l, _t, _w, _h, _i) {
		if (cursor._lock)
			return;

		setCursorEvent(e);

		autoScaleX();

		hideSelect();

		if (e != null)
			pubSync(dblclick, self, mouseLeft1, mouseTop1, plotWidCss, plotHgtCss, null);
	}

	function syncPxRatio() {
		axes.forEach(syncFontSize);
		_setSize(self.width, self.height, true);
	}

	on(dppxchange, win, syncPxRatio);

	// internal pub/sub
	const events = {};

	events.mousedown = mouseDown;
	events.mousemove = mouseMove;
	events.mouseup = mouseUp;
	events.dblclick = dblClick;
	events["setSeries"] = (e, src, idx, opts) => {
		let seriesIdxMatcher = syncOpts.match[2];
		idx = seriesIdxMatcher(self, src, idx);
		idx != -1 && setSeries(idx, opts, true, false);
	};

	if (cursor.show) {
		onMouse(mousedown,  over, mouseDown);
		onMouse(mousemove,  over, mouseMove);
		onMouse(mouseenter, over, e => {
			setCursorEvent(e);
			syncRect(false);
		});
		onMouse(mouseleave, over, mouseLeave);

		onMouse(dblclick, over, dblClick);

		cursorPlots.add(self);

		self.syncRect = syncRect;
	}

	// external on/off
	const hooks = self.hooks = opts.hooks || {};

	function fire(evName, a1, a2) {
		if (evName in hooks) {
			hooks[evName].forEach(fn => {
				fn.call(null, self, a1, a2);
			});
		}
	}

	(opts.plugins || []).forEach(p => {
		for (let evName in p.hooks)
			hooks[evName] = (hooks[evName] || []).concat(p.hooks[evName]);
	});

	const seriesIdxMatcher = (self, src, srcSeriesIdx) => srcSeriesIdx;

	const syncOpts = assign({
		key: null,
		setSeries: false,
		filters: {
			pub: retTrue,
			sub: retTrue,
		},
		scales: [xScaleKey, series[1] ? series[1].scale : null],
		match: [retEq, retEq, seriesIdxMatcher],
		values: [null, null],
	}, cursor.sync);

	if (syncOpts.match.length == 2)
		syncOpts.match.push(seriesIdxMatcher);

	cursor.sync = syncOpts;

	const syncKey = syncOpts.key;

	const sync = _sync(syncKey);

	function pubSync(type, src, x, y, w, h, i) {
		if (syncOpts.filters.pub(type, src, x, y, w, h, i))
			sync.pub(type, src, x, y, w, h, i);
	}

	sync.sub(self);

	function pub(type, src, x, y, w, h, i) {
		if (syncOpts.filters.sub(type, src, x, y, w, h, i))
			events[type](null, src, x, y, w, h, i);
	}

	self.pub = pub;

	function destroy() {
		sync.unsub(self);
		cursorPlots.delete(self);
		mouseListeners.clear();
		off(dppxchange, win, syncPxRatio);
		root.remove();
		FEAT_LEGEND && legendTable?.remove(); // in case mounted outside of root
		fire("destroy");
	}

	self.destroy = destroy;

	function _init() {
		fire("init", opts, data);

		setData(data || opts.data, false);

		if (pendScales[xScaleKey])
			setScale(xScaleKey, pendScales[xScaleKey]);
		else
			autoScaleX();

		shouldSetSelect = select.show;
		shouldSetCursor = shouldSetLegend = true;

		_setSize(opts.width, opts.height);
	}

	series.forEach(initSeries);

	axes.forEach(initAxis);

	if (then) {
		if (then instanceof HTMLElement) {
			then.appendChild(root);
			_init();
		}
		else
			then(self, _init);
	}
	else
		_init();

	return self;
}

uPlot.assign = assign;
uPlot.fmtNum = fmtNum;
uPlot.rangeNum = rangeNum;
uPlot.rangeLog = rangeLog;
uPlot.rangeAsinh = rangeAsinh;
uPlot.orient   = orient;
uPlot.pxRatio = pxRatio;

if (FEAT_JOIN) {
	uPlot.join = join;
}

if (FEAT_TIME) {
	uPlot.fmtDate = fmtDate;
	uPlot.tzDate  = tzDate;
}

uPlot.sync = _sync;

if (FEAT_PATHS) {
	uPlot.addGap = addGap;
	uPlot.clipGaps = clipGaps;

	let paths = uPlot.paths = {
		points,
	};

	FEAT_PATHS_LINEAR  && (paths.linear  = linear);
	FEAT_PATHS_STEPPED && (paths.stepped = stepped);
	FEAT_PATHS_BARS    && (paths.bars    = bars);
	FEAT_PATHS_SPLINE  && (paths.spline  = spline);
	FEAT_PATHS_SPLINE2 && (paths.spline2 = spline2);
}