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uPlot.js
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uPlot.js
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import {
copy,
assign,
PI,
inf,
abs,
floor,
round,
round2,
round3,
ceil,
min,
max,
clamp,
pow,
log10,
debounce,
closestIdx,
getMinMax,
rangeNum,
rangeLog,
incrRoundUp,
incrRoundDn,
incrRound,
isArr,
isStr,
fnOrSelf,
fmtNum,
} from './utils';
import {
WIDTH,
HEIGHT,
TOP,
BOTTOM,
LEFT,
RIGHT,
hexBlack,
firstChild,
mousemove,
mousedown,
mouseup,
mouseleave,
mouseenter,
dblclick,
resize,
scroll,
} from './strings';
import {
UPLOT,
TITLE,
WRAP,
UNDER,
OVER,
OFF,
SELECT,
CURSOR_X,
CURSOR_Y,
CURSOR_PT,
LEGEND,
LEGEND_INLINE,
LEGEND_THEAD,
LEGEND_SERIES,
LEGEND_MARKER,
LEGEND_LABEL,
LEGEND_VALUE,
} from './domClasses';
import {
rAF,
doc,
win,
pxRatio,
addClass,
remClass,
setStylePx,
placeTag,
placeDiv,
trans,
on,
off,
} from './dom';
import {
fmtDate,
tzDate,
} from './fmtDate';
import {
lineMult,
ptDia,
cursorOpts,
xAxisOpts,
yAxisOpts,
xSeriesOpts,
ySeriesOpts,
xScaleOpts,
yScaleOpts,
timeIncrs,
intIncrs,
numIncrs,
timeAxisVals,
numAxisVals,
logAxisVals,
timeSeriesVal,
numSeriesVal,
timeSeriesLabel,
numSeriesLabel,
timeAxisSplits,
numAxisSplits,
logAxisSplits,
timeAxisStamps,
_timeAxisStamps,
timeSeriesStamp,
_timeSeriesStamp,
} from './opts';
import {
_sync,
syncs,
} from './sync';
function log(name, args) {
console.log.apply(console, [name].concat(Array.prototype.slice.call(args)));
}
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 setDefault(o, i, xo, yo) {
return assign({}, (i == 0 || o && o.side % 2 == 0 ? xo : yo), o);
}
function getValPct(val, scale) {
return (
scale.distr == 3
? log10(val / scale.min) / log10(scale.max / scale.min)
: (val - scale.min) / (scale.max - scale.min)
);
}
function getYPos(val, scale, hgt, top) {
let pctY = getValPct(val, scale);
return top + (1 - pctY) * hgt;
}
function getXPos(val, scale, wid, lft) {
let pctX = getValPct(val, scale);
return lft + pctX * wid;
}
function snapTimeX(self, dataMin, dataMax) {
return [dataMin, dataMax > dataMin ? dataMax : dataMax + 86400];
}
function snapNumX(self, dataMin, dataMax) {
const delta = dataMax - dataMin;
if (delta == 0) {
const mag = log10(delta || abs(dataMax) || 1);
const exp = floor(mag) + 1;
return [dataMin, incrRoundUp(dataMax, pow(10, exp))];
}
else
return [dataMin, dataMax];
}
// 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 rangeNum(dataMin, dataMax, 0.1, true);
}
function snapLogX(self, dataMin, dataMax) {
return rangeLog(dataMin, dataMax);
}
function snapLogY(self, dataMin, dataMax) {
return rangeLog(dataMin, dataMax);
}
// dim is logical (getClientBoundingRect) pixels, not canvas pixels
function findIncr(valDelta, incrs, dim, minSpace) {
let pxPerUnit = dim / valDelta;
for (var i = 0; i < incrs.length; i++) {
let space = incrs[i] * pxPerUnit;
if (space >= minSpace)
return [incrs[i], space];
}
}
function filtMouse(e) {
return e.button == 0;
}
function pxRatioFont(font) {
let fontSize;
font = font.replace(/\d+/, m => (fontSize = round(m * pxRatio)));
return [font, fontSize];
}
export default function uPlot(opts, data, then) {
const self = {};
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);
const under = placeDiv(UNDER, wrap);
wrap.appendChild(can);
const over = placeDiv(OVER, wrap);
opts = copy(opts);
(opts.plugins || []).forEach(p => {
if (p.opts)
opts = p.opts(self, opts) || opts;
});
let ready = false;
const series = self.series = setDefaults(opts.series || [], xSeriesOpts, ySeriesOpts, false);
const axes = self.axes = setDefaults(opts.axes || [], xAxisOpts, yAxisOpts, true);
const scales = self.scales = assign({}, {x: xScaleOpts, y: yScaleOpts}, opts.scales);
const gutters = assign({
x: round(yAxisOpts.size / 2),
y: round(xAxisOpts.size / 3),
}, opts.gutters);
// self.tz = opts.tz || Intl.DateTimeFormat().resolvedOptions().timeZone;
const _tzDate = FEAT_TIME && (opts.tzDate || (ts => new Date(ts * 1e3)));
const _fmtDate = FEAT_TIME && (opts.fmtDate || fmtDate);
const _timeAxisSplits = FEAT_TIME && timeAxisSplits(_tzDate);
const _timeAxisVals = FEAT_TIME && timeAxisVals(_tzDate, timeAxisStamps(_timeAxisStamps, _fmtDate));
const _timeSeriesVal = FEAT_TIME && timeSeriesVal(_tzDate, timeSeriesStamp(_timeSeriesStamp, _fmtDate));
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};
}
const legend = FEAT_LEGEND && assign({show: true}, opts.legend);
const showLegend = FEAT_LEGEND && legend.show;
let legendEl;
let legendRows = [];
let legendCols;
let multiValLegend = false;
if (showLegend) {
legendEl = placeTag("table", LEGEND, root);
const getMultiVals = series[1] ? series[1].values : null;
multiValLegend = getMultiVals != null;
if (multiValLegend) {
let head = placeTag("tr", LEGEND_THEAD, legendEl);
placeTag("th", null, head);
legendCols = getMultiVals(self, 1, 0);
for (var key in legendCols)
placeTag("th", LEGEND_LABEL, head).textContent = key;
}
else {
legendCols = {_: 0};
addClass(legendEl, LEGEND_INLINE);
}
}
function initLegendRow(s, i) {
if (i == 0 && multiValLegend)
return null;
let _row = [];
let row = placeTag("tr", LEGEND_SERIES, legendEl, legendEl.childNodes[i]);
addClass(row, s.class);
if (!s.show)
addClass(row, OFF);
let label = placeTag("th", null, row);
let indic = placeDiv(LEGEND_MARKER, label);
s.width && (indic.style.borderColor = s.stroke);
indic.style.backgroundColor = s.fill;
let text = placeDiv(LEGEND_LABEL, label);
text.textContent = s.label;
if (i > 0) {
on("click", label, e => {
if (FEAT_CURSOR && cursor.locked)
return;
filtMouse(e) && setSeries(series.indexOf(s), {show: !s.show}, FEAT_CURSOR && syncOpts.setSeries);
});
if (cursorFocus) {
on(mouseenter, label, e => {
if (cursor.locked)
return;
setSeries(series.indexOf(s), {focus: true}, syncOpts.setSeries);
});
}
}
for (var key in legendCols) {
let v = placeTag("td", LEGEND_VALUE, row);
v.textContent = "--";
_row.push(v);
}
return _row;
}
const cursor = FEAT_CURSOR && (self.cursor = assign({}, cursorOpts, opts.cursor));
FEAT_CURSOR && (cursor.points.show = fnOrSelf(cursor.points.show));
const focus = self.focus = assign({}, opts.focus || {alpha: 0.3}, FEAT_CURSOR && cursor.focus);
const cursorFocus = FEAT_CURSOR && 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);
trans(pt, -10, -10);
over.insertBefore(pt, cursorPts[si]);
return pt;
}
}
}
function initSeries(s, i) {
// init scales & defaults
const scKey = s.scale;
const sc = scales[scKey] = assign({}, (i == 0 ? xScaleOpts : yScaleOpts), scales[scKey]);
let isTime = FEAT_TIME && sc.time;
let isLog = sc.distr == 3;
sc.range = fnOrSelf(sc.range || (isTime ? snapTimeX : i == 0 ? (isLog ? snapLogX : snapNumX) : (isLog ? snapLogY : snapNumY)));
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 || (FEAT_PATHS && buildPaths);
let _ptDia = ptDia(s.width, 1);
s.points = assign({}, {
size: _ptDia,
width: max(1, _ptDia * .2),
}, s.points);
s.points.show = fnOrSelf(s.points.show);
s._paths = null;
}
if (showLegend)
legendRows.splice(i, 0, initLegendRow(s, i));
if (FEAT_CURSOR && cursor.show) {
let pt = initCursorPt(s, i);
pt && cursorPts.splice(i, 0, pt);
}
}
function addSeries(opts, si) {
si = si == null ? series.length : si;
opts = setDefault(opts, si, xSeriesOpts, ySeriesOpts);
series.splice(si, 0, opts);
initSeries(series[si], si);
}
self.addSeries = addSeries;
function delSeries(i) {
series.splice(i, 1);
FEAT_LEGEND && showLegend && legendRows.splice(i, 1)[0][0].parentNode.remove();
FEAT_CURSOR && cursorPts.length > 1 && cursorPts.splice(i, 1)[0].remove();
// TODO: de-init no-longer-needed scales?
}
self.delSeries = delSeries;
series.forEach(initSeries);
const xScaleKey = series[0].scale;
const xScaleDistr = scales[xScaleKey].distr;
// dependent scales inherit
for (let k in scales) {
let sc = scales[k];
if (sc.from != null)
scales[k] = assign({}, scales[sc.from], sc);
}
function initAxis(axis, i) {
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.space = fnOrSelf(axis.space);
axis.rotate = fnOrSelf(axis.rotate);
axis.incrs = fnOrSelf(axis.incrs || ( sc.distr == 2 ? intIncrs : (isTime ? timeIncrs : numIncrs)));
axis.splits = fnOrSelf(axis.splits || (isTime && sc.distr == 1 ? _timeAxisSplits : sc.distr == 3 ? logAxisSplits : numAxisSplits));
let av = axis.values;
axis.values = isTime ? (isArr(av) ? timeAxisVals(_tzDate, timeAxisStamps(av, _fmtDate)) : av || _timeAxisVals) : av || (sc.distr == 3 ? logAxisVals : numAxisVals);
axis.font = pxRatioFont(axis.font);
axis.labelFont = pxRatioFont(axis.labelFont);
}
}
// set axis defaults
axes.forEach(initAxis);
let dataLen;
// rendered data window
let i0 = null;
let i1 = null;
const idxs = series[0].idxs;
let data0 = null;
function setData(_data, _resetScales) {
_data = _data || [];
_data[0] = _data[0] || [];
self.data = _data;
data = _data.slice();
data0 = data[0];
dataLen = data0.length;
if (xScaleDistr == 2)
data[0] = data0.map((v, i) => i);
resetYSeries();
fire("setData");
if (_resetScales !== false) {
let xsc = scales[xScaleKey];
if (xsc.auto)
autoScaleX();
else
_setScale(xScaleKey, xsc.min, xsc.max);
}
}
self.setData = setData;
function autoScaleX() {
i0 = idxs[0] = 0;
i1 = idxs[1] = dataLen - 1;
let _min = xScaleDistr == 2 ? i0 : data[0][i0],
_max = xScaleDistr == 2 ? i1 : data[0][i1];
_setScale(xScaleKey, _min, _max);
}
function setCtxStyle(stroke, width, dash, fill) {
ctx.strokeStyle = stroke || hexBlack;
ctx.lineWidth = width;
ctx.lineJoin = "round";
ctx.setLineDash(dash || []);
ctx.fillStyle = fill || hexBlack;
}
let fullWidCss;
let fullHgtCss;
let plotWidCss;
let plotHgtCss;
// plot margins to account for axes
let plotLftCss;
let plotTopCss;
let plotLft;
let plotTop;
let plotWid;
let plotHgt;
self.bbox = {};
function _setSize(width, height) {
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);
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);
can[WIDTH] = round(fullWidCss * pxRatio);
can[HEIGHT] = round(fullHgtCss * pxRatio);
syncRect();
ready && _setScale(xScaleKey, scales[xScaleKey].min, scales[xScaleKey].max);
ready && fire("setSize");
}
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) {
let {side, size} = axis;
let isVt = side % 2;
let labelSize = axis.labelSize = (axis.label != null ? (axis.labelSize || 30) : 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;
}
}
}
});
// hz gutters
if (hasTopAxis || hasBtmAxis) {
if (!hasRgtAxis)
plotWidCss -= gutters.x;
if (!hasLftAxis) {
plotWidCss -= gutters.x;
plotLftCss += gutters.x;
}
}
// vt gutters
if (hasLftAxis || hasRgtAxis) {
if (!hasBtmAxis)
plotHgtCss -= gutters.y;
if (!hasTopAxis) {
plotHgtCss -= gutters.y;
plotTopCss += gutters.y;
}
}
}
function calcAxesRects() {
// will accum +
let off1 = plotLftCss + plotWidCss;
let off2 = plotTopCss + plotHgtCss;
// will accum -
let off3 = plotLftCss;
let off0 = plotTopCss;
function incrOffset(side, size) {
let ret;
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) => {
let side = axis.side;
axis._pos = incrOffset(side, axis.size);
if (axis.label != null)
axis._lpos = incrOffset(side, axis.labelSize);
});
}
function setScales() {
if (inBatch) {
shouldSetScales = true;
return;
}
// log("setScales()", arguments);
if (dataLen > 0) {
// wip scales
let wipScales = copy(scales);
for (let k in wipScales) {
let wsc = wipScales[k];
let psc = pendScales[k];
if (psc != null) {
assign(wsc, psc);
// explicitly setting the x-scale invalidates everything (acts as redraw)
if (k == xScaleKey)
resetYSeries();
}
else if (k != xScaleKey) {
wsc.min = inf;
wsc.max = -inf;
}
}
// pre-range y-scales from y series' data values
series.forEach((s, i) => {
let k = s.scale;
let wsc = wipScales[k];
// setting the x scale invalidates everything
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]);
// 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 && pendScales[k] == null) {
// only run getMinMax() for invalidated series data, else reuse
let minMax = s.min == inf ? (wsc.auto ? getMinMax(data[i], i0, i1, s.sorted) : [0,100]) : [s.min, s.max];
// initial min/max
wsc.min = min(wsc.min, s.min = minMax[0]);
wsc.max = max(wsc.max, s.max = minMax[1]);
}
s.idxs[0] = i0;
s.idxs[1] = i1;
});
// range independent scales
for (let k in wipScales) {
let wsc = wipScales[k];
if (wsc.from == null && wsc.min != inf && pendScales[k] == null) {
let minMax = wsc.range(self, wsc.min, 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 != inf) {
let minMax = wsc.range(self, base.min, base.max, k);
wsc.min = minMax[0];
wsc.max = minMax[1];
}
}
}
let changed = {};
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;
changed[k] = true;
}
}
// invalidate paths of all series on changed scales
series.forEach(s => {
if (changed[s.scale])
s._paths = null;
});
for (let k in changed)
fire("setScale", k);
}
for (let k in pendScales)
pendScales[k] = null;
FEAT_CURSOR && cursor.show && updateCursor();
}
// TODO: drawWrap(si, drawPoints) (save, restore, translate, clip)
function drawPoints(si) {
// log("drawPoints()", arguments);
let s = series[si];
let p = s.points;
const width = round3(p.width * pxRatio);
const offset = (width % 2) / 2;
const isStroked = p.width > 0;
let rad = (p.size - p.width) / 2 * pxRatio;
let dia = round3(rad * 2);
ctx.translate(offset, offset);
ctx.save();
ctx.beginPath();
ctx.rect(
plotLft - dia,
plotTop - dia,
plotWid + dia * 2,
plotHgt + dia * 2,
);
ctx.clip();
ctx.globalAlpha = s.alpha;
const path = new Path2D();
for (let pi = i0; pi <= i1; pi++) {
if (data[si][pi] != null) {
let x = round(getXPos(data[0][pi], scales[xScaleKey], plotWid, plotLft));
let y = round(getYPos(data[si][pi], scales[s.scale], plotHgt, plotTop));
path.moveTo(x + rad, y);
path.arc(x, y, rad, 0, PI * 2);
}
}
setCtxStyle(
p.stroke || s.stroke || hexBlack,
width,
null,
p.fill || (isStroked ? "#fff" : s.stroke || hexBlack),
);
ctx.fill(path);
isStroked && ctx.stroke(path);
ctx.globalAlpha = 1;
ctx.restore();
ctx.translate(-offset, -offset);
}
// 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];
}
let dir = 1;
function drawSeries() {
// path building loop must be before draw loop to ensure that all bands are fully constructed
series.forEach((s, i) => {
if (i > 0 && s.show && dataLen > 0 && s._paths == null) {
let _idxs = getOuterIdxs(data[i]);
s._paths = s.paths(self, i, _idxs[0], _idxs[1]);
}
});
series.forEach((s, i) => {
if (i > 0 && s.show) {
if (s._paths)
FEAT_PATHS && drawPath(i);
if (s.points.show(self, i, i0, i1))
FEAT_POINTS && drawPoints(i);
fire("drawSeries", i);
}
});
}
function drawPath(si) {
const s = series[si];
if (dir == 1) {
const { stroke, fill, clip } = s._paths;
const width = round3(s[WIDTH] * pxRatio);
const offset = (width % 2) / 2;
setCtxStyle(s.stroke, width, s.dash, s.fill);
ctx.globalAlpha = s.alpha;
ctx.translate(offset, offset);
ctx.save();
let lft = plotLft,
top = plotTop,
wid = plotWid,
hgt = plotHgt;
let halfWid = width * pxRatio / 2;
if (s.min == 0)
hgt += halfWid;
if (s.max == 0) {
top -= halfWid;
hgt += halfWid;
}
ctx.beginPath();
ctx.rect(lft, top, wid, hgt);
ctx.clip();
if (clip != null)
ctx.clip(clip);
if (s.band) {
ctx.fill(stroke);
width && ctx.stroke(stroke);
}
else {
width && ctx.stroke(stroke);
if (s.fill != null)
ctx.fill(fill);
}
ctx.restore();
ctx.translate(-offset, -offset);
ctx.globalAlpha = 1;
}
if (s.band)
dir *= -1;
}
function buildClip(is, gaps, nullHead, nullTail) {
let s = series[is];
let clip = null;
// create clip path (invert gaps and non-gaps)
if (gaps.length > 0) {
if (s.spanGaps) {
let headGap = gaps[0];
let tailGap = gaps[gaps.length - 1];
gaps = [];
if (nullHead)
gaps.push(headGap);
if (nullTail)
gaps.push(tailGap);
}
clip = new Path2D();
let prevGapEnd = plotLft;
for (let i = 0; i < gaps.length; i++) {
let g = gaps[i];
clip.rect(prevGapEnd, plotTop, g[0] - prevGapEnd, plotTop + plotHgt);
prevGapEnd = g[1];
}
clip.rect(prevGapEnd, plotTop, plotLft + plotWid - prevGapEnd, plotTop + plotHgt);
}
return clip;
}
function addGap(gaps, outX, x) {
let prevGap = gaps[gaps.length - 1];
if (prevGap && prevGap[0] == outX) // TODO: gaps must be encoded at stroke widths?