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Chart.Scatter.js
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Chart.Scatter.js
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(function (root, factory) {
if (typeof define === 'function' && define.amd) {
// AMD. Register as an anonymous module.
define(['Chart'], factory);
} else if (typeof exports === 'object') {
// Node. Does not work with strict CommonJS, but
// only CommonJS-like environments that support module.exports,
// like Node.
factory(require('Chart'));
} else {
// Browser globals (root is window)
factory(root.Chart);
}
}(this, function (chartjs) {
"use strict";
var helpers = chartjs.helpers,
hlp = {
formatDateValue: function (date, tFormat, dFormat, useUtc) {
date = new Date(+date);
var ms = useUtc ? date.getUTCMilliseconds() : date.getMilliseconds();
if (ms) {
return ('000' + ms).slice(-3);
}
var hasTime = useUtc
? date.getUTCHours() + date.getUTCMinutes() + date.getUTCSeconds()
: date.getHours() + date.getMinutes() + date.getSeconds();
if (hasTime) {
return dateFormat(date, tFormat || "h:MM", useUtc);
} else {
return dateFormat(date, dFormat || "mmm d", useUtc);
}
},
getElementOrDefault: function (array, index, defaultValue) {
return index >= 0 && index < array.length
? array[index]
: defaultValue;
},
applyRange: function (value, min, max) {
return value > max ? max
: value < min ? min
: value;
},
ScatterPoint: chartjs.Point.extend({
inRange: function (chartX, chartY) {
var hitDetectionRange = this.hitDetectionRadius + this.radius * this.size;
return ((Math.pow(chartX - this.x, 2) + Math.pow(chartY - this.y, 2)) < Math.pow(hitDetectionRange, 2));
},
draw: function () {
if (this.display && this.size > 0) {
var ctx = this.ctx;
ctx.beginPath();
ctx.arc(this.x, this.y, this.size * this.radius, 0, Math.PI * 2);
ctx.closePath();
ctx.strokeStyle = this.strokeColor;
ctx.lineWidth = this.strokeWidth;
ctx.fillStyle = this.fillColor;
ctx.fill();
ctx.stroke();
}
}
})
};
var dateFormat = function () {
var token = /d{1,4}|m{1,4}|yy(?:yy)?|([HhMsTt])\1?|[LloSZ]|"[^"]*"|'[^']*'/g,
timezone = /\b(?:[PMCEA][SDP]T|(?:Pacific|Mountain|Central|Eastern|Atlantic) (?:Standard|Daylight|Prevailing) Time|(?:GMT|UTC)(?:[-+]\d{4})?)\b/g,
timezoneClip = /[^-+\dA-Z]/g,
pad = function (val, len) {
val = String(val);
len = len || 2;
while (val.length < len) val = "0" + val;
return val;
},
masks = {
"default": "ddd mmm dd yyyy HH:MM:ss"
},
i18n = {
dayNames: [
"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat",
"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"
],
monthNames: [
"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec",
"January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"
]
};
// Regexes and supporting functions are cached through closure
return function (date, mask, utc) {
// You can't provide utc if you skip other args (use the "UTC:" mask prefix)
if (arguments.length == 1 && Object.prototype.toString.call(date) == "[object String]" && !/\d/.test(date)) {
mask = date;
date = undefined;
}
// Passing date through Date applies Date.parse, if necessary
date = date ? new Date(date) : new Date;
if (isNaN(date)) throw SyntaxError("invalid date");
mask = String(masks[mask] || mask || masks["default"]);
// Allow setting the utc argument via the mask
if (mask.slice(0, 4) == "UTC:") {
mask = mask.slice(4);
utc = true;
}
var _ = utc ? "getUTC" : "get",
d = date[_ + "Date"](),
D = date[_ + "Day"](),
m = date[_ + "Month"](),
y = date[_ + "FullYear"](),
H = date[_ + "Hours"](),
M = date[_ + "Minutes"](),
s = date[_ + "Seconds"](),
L = date[_ + "Milliseconds"](),
o = utc ? 0 : date.getTimezoneOffset(),
flags = {
d: d,
dd: pad(d),
ddd: i18n.dayNames[D],
dddd: i18n.dayNames[D + 7],
m: m + 1,
mm: pad(m + 1),
mmm: i18n.monthNames[m],
mmmm: i18n.monthNames[m + 12],
yy: String(y).slice(2),
yyyy: y,
h: H % 12 || 12,
hh: pad(H % 12 || 12),
H: H,
HH: pad(H),
M: M,
MM: pad(M),
s: s,
ss: pad(s),
l: pad(L, 3),
L: pad(L > 99 ? Math.round(L / 10) : L),
t: H < 12 ? "a" : "p",
tt: H < 12 ? "am" : "pm",
T: H < 12 ? "A" : "P",
TT: H < 12 ? "AM" : "PM",
Z: utc ? "UTC" : (String(date).match(timezone) || [""]).pop().replace(timezoneClip, ""),
o: (o > 0 ? "-" : "+") + pad(Math.floor(Math.abs(o) / 60) * 100 + Math.abs(o) % 60, 4),
S: ["th", "st", "nd", "rd"][d % 10 > 3 ? 0 : (d % 100 - d % 10 != 10) * d % 10]
};
return mask.replace(token, function ($0) {
return $0 in flags ? flags[$0] : $0.slice(1, $0.length - 1);
});
};
}();
var defaultConfig = {
// INHERIT
// showScale: true, // Boolean - If we should show the scale at all
// scaleLineColor: "rgba(0,0,0,.1)", // String - Colour of the scale line
// scaleLineWidth: 1, // Number - Pixel width of the scale line
// scaleShowLabels: true, // Boolean - Whether to show labels on the scale
// scaleLabel: "<%=value%>", // Interpolated JS string - can access value
scaleArgLabel: "<%=value%>", // Interpolated JS string - can access value
scaleSizeLabel: "<%=value%>", // Interpolated JS string - can access value
emptyDataMessage: "chart has no data", // String - Message for empty data
// SCALE
scaleShowGridLines: true, //Boolean - Whether grid lines are shown across the chart
scaleGridLineWidth: 1, //Number - Width of the grid lines
scaleGridLineColor: "rgba(0,0,0,.05)", //String - Colour of the grid lines
scaleShowHorizontalLines: true, //Boolean - Whether to show horizontal lines (except X axis)
scaleShowVerticalLines: true, //Boolean - Whether to show vertical lines (except Y axis)
// DATE SCALE
scaleType: "number",
useUtc: true,
scaleDateFormat: "mmm d",
scaleTimeFormat: "h:MM",
scaleDateTimeFormat: "mmm d, yyyy, hh:MM",
// LINES
datasetStroke: true, // Boolean - Whether to show a stroke for datasets
datasetStrokeWidth: 2, // Number - Pixel width of dataset stroke
datasetStrokeColor: '#007ACC', // String - Color of dataset stroke
datasetPointStrokeColor: 'white', // String - Color of dataset stroke
bezierCurve: true, // Boolean - Whether the line is curved between points
bezierCurveTension: 0.4, // Number - Tension of the bezier curve between points
// POINTS
pointDot: true, // Boolean - Whether to show a dot for each point
pointDotStrokeWidth: 1, // Number - Pixel width of point dot stroke
pointDotRadius: 4, // Number - Radius of each point dot in pixels
pointHitDetectionRadius: 4, // Number - amount extra to add to the radius to cater for hit detection outside the drawn point
multiTooltipTemplate: "<%=argLabel%>; <%=valueLabel%>",
tooltipTemplate: "<%if (datasetLabel){%><%=datasetLabel%>: <%}%><%=argLabel%>; <%=valueLabel%>",
legendTemplate: "<ul class=\"<%=name.toLowerCase()%>-legend\"><%for(var i=0;i<datasets.length;i++){%><li><span class=\"<%=name.toLowerCase()%>-legend-marker\" style=\"background-color:<%=datasets[i].strokeColor%>\"></span><%=datasets[i].label%></li><%}%></ul>"
};
chartjs.ScatterNumberScale = chartjs.Element.extend({
initialize: function () {
// this.dataRange - минимальные и максимальные значения данных
// инициализируем настройки
// рассчитываем вспомогательные параметры
this.font = helpers.fontString(this.fontSize, this.fontStyle, this.fontFamily);
this.padding = this.fontSize / 2;
},
setDataRange: function (dataRange) {
this.dataRange = dataRange;
},
api: {
calculateControlPoints: function (prev, current, next, range, tension) {
var tensionBefore = !!prev ? tension : 0;
var tensionAfter = !!next ? tension : 0;
var innerCurrent = current;
var innerPrev = prev ? prev : current;
var innerNext = next ? next : current;
var a = { xx: innerCurrent.arg - innerPrev.arg, yy: innerCurrent.value - innerPrev.value }
var b = { xx: innerNext.arg - innerPrev.arg, yy: innerNext.value - innerPrev.value }
var mul = a.xx * b.xx + a.yy * b.yy;
var mod = Math.sqrt(b.xx * b.xx + b.yy * b.yy);
var k = Math.min(Math.max(mul / (mod * mod), 0.3), 0.7);
var result = {
before: {
x: innerCurrent.arg - b.xx * k * tensionBefore,
y: innerCurrent.value - b.yy * k * tensionBefore
},
after: {
x: innerCurrent.arg + b.xx * (1 - k) * tensionAfter,
y: innerCurrent.value + b.yy * (1 - k) * tensionAfter
}
};
// Cap inner bezier handles to the upper/lower scale bounds
result.before.y = hlp.applyRange(result.before.y, range.ymin, range.ymax);
result.after.y = hlp.applyRange(result.after.y, range.ymin, range.ymax);
return result;
},
generateLabels: function (templateString, numberOfSteps, graphMin, stepValue) {
var labelsArray = new Array(numberOfSteps + 1),
stepDecimalPlaces = helpers.getDecimalPlaces(stepValue);
if (templateString) {
helpers.each(labelsArray, function (val, index) {
labelsArray[index] = helpers.template(templateString, { value: (graphMin + (stepValue * (index))).toFixed(stepDecimalPlaces) });
});
}
return labelsArray;
}
},
calculateYscaleRange: function () {
if (this.scaleOverride) {
this.yScaleRange = {
steps: this.scaleSteps,
stepValue: this.scaleStepWidth,
min: this.scaleStartValue,
max: this.scaleStartValue + (this.scaleSteps * this.scaleStepWidth)
};
} else {
this.yScaleRange = helpers.calculateScaleRange(
[this.dataRange.ymin, this.dataRange.ymax],
this.chart.height,
this.fontSize,
this.beginAtZero, // beginAtZero,
this.integersOnly); // integersOnly
}
},
calculateXscaleRange: function () {
this.xScaleRange = helpers.calculateScaleRange(
[this.dataRange.xmin, this.dataRange.xmax],
this.chart.width,
this.fontSize,
false, // beginAtZero,
true); // integersOnly
},
generateYLabels: function () {
this.yLabels = this.api.generateLabels(
this.labelTemplate,
this.yScaleRange.steps,
this.yScaleRange.min,
this.yScaleRange.stepValue);
},
generateXLabels: function () {
this.xLabels = this.api.generateLabels(
this.argLabelTemplate,
this.xScaleRange.steps,
this.xScaleRange.min,
this.xScaleRange.stepValue);
},
argToString: function (arg) {
return +arg + "";
},
fit: function () {
// labels & padding
this.calculateYscaleRange();
this.calculateXscaleRange();
this.generateYLabels();
this.generateXLabels();
var xLabelMaxWidth = helpers.longestText(this.chart.ctx, this.font, this.xLabels);
var yLabelMaxWidth = helpers.longestText(this.chart.ctx, this.font, this.yLabels);
this.xPadding = this.display && this.showLabels
? yLabelMaxWidth + this.padding * 2
: this.padding;
var xStepWidth = Math.floor((this.chart.width - this.xPadding) / this.xScaleRange.steps);
var xLabelHeight = this.fontSize * 1.5;
this.xLabelRotation = xLabelMaxWidth > xStepWidth;
this.xPaddingRight = this.display && this.showLabels && !this.xLabelRotation
? xLabelMaxWidth / 2
: this.padding;
this.yPadding = this.display && this.showLabels
? (this.xLabelRotation ? xLabelMaxWidth : xLabelHeight) + this.padding * 2
: this.padding;
},
updateBezierControlPoints: function (dataSetPoints, ease, tension) {
for (var i = 0; i < dataSetPoints.length; i++) {
var current = hlp.getElementOrDefault(dataSetPoints, i);
var prev = hlp.getElementOrDefault(dataSetPoints, i - 1);
var next = hlp.getElementOrDefault(dataSetPoints, i + 1);
var obj = this.api.calculateControlPoints(prev, current, next, this.dataRange, tension);
current.controlPoints = {
x1: this.calculateX(obj.before.x),
y1: this.calculateY(obj.before.y, ease),
x2: this.calculateX(obj.after.x),
y2: this.calculateY(obj.after.y, ease)
};
}
},
updatePoints: function (dataSetPoints, ease) {
for (var i = 0; i < dataSetPoints.length; i++) {
var current = dataSetPoints[i];
current.x = this.calculateX(current.arg);
current.y = this.calculateY(current.value, ease);
}
},
calculateX: function (x) {
return this.xPadding + ((x - this.xScaleRange.min) * (this.chart.width - this.xPadding - this.xPaddingRight) / (this.xScaleRange.max - this.xScaleRange.min));
},
calculateY: function (y, ease) {
return this.chart.height - this.yPadding - ((y - this.yScaleRange.min) * (this.chart.height - this.yPadding - this.padding) / (this.yScaleRange.max - this.yScaleRange.min)) * (ease || 1);
},
draw: function () {
var ctx = this.chart.ctx, value, index;
if (this.display) {
var xpos1 = this.calculateX(this.xScaleRange.min);
var xpos2 = this.chart.width;
var ypos1 = this.calculateY(this.yScaleRange.min);
var ypos2 = 0;
// y axis
for (index = 0, value = this.yScaleRange.min;
index <= this.yScaleRange.steps;
index++, value += this.yScaleRange.stepValue) {
var ypos = this.calculateY(value);
if (this.showLabels || this.showHorizontalLines) {
// line color
ctx.lineWidth = index == 0 ? this.lineWidth : this.gridLineWidth;
ctx.strokeStyle = index == 0 ? this.lineColor : this.gridLineColor;
ctx.beginPath();
ctx.moveTo(xpos1 - this.padding, ypos);
ctx.lineTo(this.showHorizontalLines || index == 0 ? xpos2 : xpos1, ypos);
ctx.stroke();
}
// labels
if (this.showLabels) {
ctx.lineWidth = this.lineWidth;
ctx.strokeStyle = this.lineColor;
// text
ctx.textAlign = "right";
ctx.textBaseline = "middle";
ctx.font = this.font;
ctx.fillStyle = this.textColor;
ctx.fillText(this.yLabels[index], xpos1 - this.padding * 1.4, ypos);
}
}
// x axis
for (index = 0, value = this.xScaleRange.min;
index <= this.xScaleRange.steps;
index++, value += this.xScaleRange.stepValue) {
var xpos = this.calculateX(value);
if (this.showLabels || this.showVerticalLines) {
// line color
ctx.lineWidth = index == 0 ? this.lineWidth : this.gridLineWidth;
ctx.strokeStyle = index == 0 ? this.lineColor : this.gridLineColor;
ctx.beginPath();
ctx.moveTo(xpos, ypos1 + this.padding);
ctx.lineTo(xpos, this.showVerticalLines || index == 0 ? ypos2 : ypos1);
ctx.stroke();
}
// labels
if (this.showLabels) {
ctx.lineWidth = this.lineWidth;
ctx.strokeStyle = this.lineColor;
// text
ctx.save();
ctx.translate(xpos, ypos1 + (this.padding * 1.4));
ctx.rotate(this.xLabelRotation ? -Math.PI / 2 : 0);
ctx.textAlign = (this.xLabelRotation) ? "right" : "center";
ctx.textBaseline = (this.xLabelRotation) ? "middle" : "top";
ctx.font = this.font;
ctx.fillStyle = this.textColor;
ctx.fillText(this.xLabels[index], 0, 0);
ctx.restore();
}
}
}
}
});
chartjs.ScatterDateScale = chartjs.ScatterNumberScale.extend({
_calculateDateScaleRange: function (valueMin, valueMax, drawingSize, fontSize) {
// todo: move to global object
var units = [
{ u: 1, c: 1, t: 1, n: 'ms' },
{ u: 1, c: 2, t: 2, n: 'ms' },
{ u: 1, c: 5, t: 5, n: 'ms' },
{ u: 1, c: 10, t: 10, n: 'ms' },
{ u: 1, c: 20, t: 20, n: 'ms' },
{ u: 1, c: 50, t: 50, n: 'ms' },
{ u: 1, c: 100, t: 100, n: 'ms' },
{ u: 1, c: 200, t: 200, n: 'ms' },
{ u: 1, c: 500, t: 500, n: 'ms' },
{ u: 1000, c: 1, t: 1000, n: 's' },
{ u: 1000, c: 2, t: 2000, n: 's' },
{ u: 1000, c: 5, t: 5000, n: 's' },
{ u: 1000, c: 10, t: 10000, n: 's' },
{ u: 1000, c: 15, t: 15000, n: 's' },
{ u: 1000, c: 20, t: 20000, n: 's' },
{ u: 1000, c: 30, t: 30000, n: 's' },
{ u: 60000, c: 1, t: 60000, n: 'm' },
{ u: 60000, c: 2, t: 120000, n: 'm' },
{ u: 60000, c: 5, t: 300000, n: 'm' },
{ u: 60000, c: 10, t: 600000, n: 'm' },
{ u: 60000, c: 15, t: 900000, n: 'm' },
{ u: 60000, c: 20, t: 1200000, n: 'm' },
{ u: 60000, c: 30, t: 1800000, n: 'm' },
{ u: 3600000, c: 1, t: 3600000, n: 'h' },
{ u: 3600000, c: 2, t: 7200000, n: 'h' },
{ u: 3600000, c: 3, t: 10800000, n: 'h' },
{ u: 3600000, c: 4, t: 14400000, n: 'h' },
{ u: 3600000, c: 6, t: 21600000, n: 'h' },
{ u: 3600000, c: 8, t: 28800000, n: 'h' },
{ u: 3600000, c: 12, t: 43200000, n: 'h' },
{ u: 86400000, c: 1, t: 86400000, n: 'd' },
{ u: 86400000, c: 2, t: 172800000, n: 'd' },
{ u: 86400000, c: 4, t: 345600000, n: 'd' },
{ u: 86400000, c: 5, t: 432000000, n: 'd' },
{ u: 604800000, c: 1, t: 604800000, n: 'w' }];
var maxSteps = drawingSize / (fontSize * 3.3);
var valueRange = +valueMax - valueMin,
offset = this.useUtc ? 0 : new Date().getTimezoneOffset() * 60000,
min = +valueMin - offset,
max = +valueMax - offset;
var xp = 0, f = [2, 3, 5, 7, 10];
while (valueRange / units[xp].t > maxSteps) {
xp++;
if (xp == units.length) {
var last = units[units.length - 1];
for (var fp = 0; fp < f.length; fp++) {
units.push({
u: last.u,
c: last.c * f[fp],
t: last.c * f[fp] * last.u,
n: last.n
});
}
}
}
var stepValue = units[xp].t,
start = Math.floor(min / stepValue) * stepValue,
stepCount = Math.ceil((max - start) / stepValue),
end = start + stepValue * stepCount;
return {
min: start + offset,
max: end + offset,
steps: stepCount,
stepValue: stepValue
};
},
calculateXscaleRange: function () {
this.xScaleRange = this._calculateDateScaleRange(
this.dataRange.xmin,
this.dataRange.xmax,
this.chart.width,
this.fontSize
);
},
argToString: function (arg) {
return dateFormat(+arg, this.dateTimeFormat, this.useUtc);
},
generateXLabels: function () {
var graphMin = this.xScaleRange.min,
stepValue = this.xScaleRange.stepValue,
labelsArray = new Array(this.xScaleRange.steps + 1);
helpers.each(labelsArray, function (val, index) {
var value = graphMin + stepValue * index;
labelsArray[index] = hlp.formatDateValue(value, this.timeFormat, this.dateFormat, this.useUtc);
}, this);
this.xLabels = labelsArray;
}
});
chartjs.ScatterDataSet = (function () {
var datasetCtr = function (datasetOptions, chartOptions, chart, scale) {
this.chart = chart;
this.scale = scale;
this.label = datasetOptions.label || null;
this.strokeColor = datasetOptions.strokeColor || chartOptions.datasetStrokeColor;
this.pointColor = datasetOptions.pointColor || datasetOptions.strokeColor || chartOptions.datasetStrokeColor;
this.pointStrokeColor = datasetOptions.pointStrokeColor || chartOptions.datasetPointStrokeColor;
this.pointDot = chartOptions.pointDot;
this.pointDotRadius = chartOptions.pointDotRadius;
this.pointHitDetectionRadius = chartOptions.pointHitDetectionRadius;
this.pointDotStrokeWidth = chartOptions.pointDotStrokeWidth;
this.scaleArgLabel = chartOptions.scaleArgLabel;
this.scaleLabel = chartOptions.scaleLabel;
this.scaleSizeLabel = chartOptions.scaleSizeLabel;
this.points = [];
};
datasetCtr.prototype.addPoint = function (x, y, r) {
// default size
r = arguments.length < 3 ? 1 : r;
var point = this._createNewPoint();
this._setPointData(point, x, y, r);
this.points.push(point);
};
datasetCtr.prototype.setPointData = function (index, x, y, r) {
// default size
r = arguments.length < 4 ? 1 : r;
var point = hlp.getElementOrDefault(this.points, index);
if (point) {
this._setPointData(point, x, y, r);
}
};
datasetCtr.prototype.removePoint = function (index) {
if (index >= 0 && index < this.points.length) {
this.points.splice(index, 1);
}
};
datasetCtr.prototype._createNewPoint = function () {
return new hlp.ScatterPoint({
ctx: this.chart.ctx,
datasetLabel: this.label,
// point
display: this.pointDot,
radius: this.pointDotRadius,
hitDetectionRadius: this.pointHitDetectionRadius,
strokeWidth: this.pointDotStrokeWidth,
// colors
strokeColor: this.pointStrokeColor,
highlightStroke: this.pointColor,
fillColor: this.pointColor,
highlightFill: this.pointStrokeColor
});
};
datasetCtr.prototype._setPointData = function (point, x, y, r) {
var formattedArg = this.scale.argToString(+x),
formattedValue = +y + "",
formattedSize = +r + "";
point.arg = +x;
point.value = +y;
point.size = +r; // for use in templates
point.argLabel = helpers.template(this.scaleArgLabel, { value: formattedArg }),
point.valueLabel = helpers.template(this.scaleLabel, { value: formattedValue });
point.sizeLabel = helpers.template(this.scaleSizeLabel, { value: formattedSize });
};
return datasetCtr;
})();
chartjs.Type.extend({
name: "Scatter",
defaults: defaultConfig,
initialize: function (datasets) {
this.hasData = false;
this.datasets = [];
this.scale = this._initScale();
// Compatibility layer
if (datasets.datasets) {
datasets = datasets.datasets;
}
//Iterate through each of the datasets, and build this into a property of the chart
helpers.each(datasets, function (dataset) {
var datasetObject = new chartjs.ScatterDataSet(dataset, this.options, this.chart, this.scale);
this.datasets.push(datasetObject);
this.hasData |= !!dataset.data.length;
helpers.each(dataset.data, function (dataPoint) {
datasetObject.addPoint(dataPoint.x, dataPoint.y, dataPoint.r || 1);
});
}, this);
//Set up tooltip events on the chart
if (this.options.showTooltips) {
helpers.bindEvents(this, this.options.tooltipEvents, function (evt) {
var activePoints = (evt.type !== 'mouseout') ? this.getPointsAtEvent(evt) : [];
this._forEachPoint(function (point) {
point.restore(['fillColor', 'strokeColor']);
});
helpers.each(activePoints, function (activePoint) {
activePoint.fillColor = activePoint.highlightFill;
activePoint.strokeColor = activePoint.highlightStroke;
});
this.showTooltip(activePoints);
});
}
var dataRange = this._calculateRange();
this.scale.setDataRange(dataRange);
this.update();
},
_initScale: function () {
var scaleOptions = {
chart: this.chart,
textColor: this.options.scaleFontColor,
fontSize: this.options.scaleFontSize,
fontStyle: this.options.scaleFontStyle,
fontFamily: this.options.scaleFontFamily,
labelTemplate: this.options.scaleLabel,
argLabelTemplate: this.options.scaleArgLabel,
showLabels: this.options.scaleShowLabels,
beginAtZero: this.options.scaleBeginAtZero,
integersOnly: this.options.scaleIntegersOnly,
gridLineWidth: (this.options.scaleShowGridLines) ? this.options.scaleGridLineWidth : 0,
gridLineColor: (this.options.scaleShowGridLines) ? this.options.scaleGridLineColor : "rgba(0,0,0,0)",
showHorizontalLines: this.options.scaleShowHorizontalLines,
showVerticalLines: this.options.scaleShowVerticalLines,
lineWidth: this.options.scaleLineWidth,
lineColor: this.options.scaleLineColor,
display: this.options.showScale,
// range
scaleOverride: this.options.scaleOverride,
scaleSteps: this.options.scaleSteps,
scaleStepWidth: this.options.scaleStepWidth,
scaleStartValue: this.options.scaleStartValue,
// dates
useUtc: this.options.useUtc,
dateFormat: this.options.scaleDateFormat,
timeFormat: this.options.scaleTimeFormat,
dateTimeFormat: this.options.scaleDateTimeFormat
};
return this.options.scaleType === "date"
? new chartjs.ScatterDateScale(scaleOptions)
: new chartjs.ScatterNumberScale(scaleOptions);
},
// helpers
getPointsAtEvent: function (e) {
var pointsArray = [],
eventPosition = helpers.getRelativePosition(e);
helpers.each(this.datasets, function (dataset) {
helpers.each(dataset.points, function (point) {
if (point.inRange(eventPosition.x, eventPosition.y)) pointsArray.push(point);
});
}, this);
return pointsArray;
},
showTooltip: function (elements) {
this.draw();
if (elements.length > 0) {
var firstElement = elements[0];
var tooltipPosition = firstElement.tooltipPosition();
if (elements.length == 1) {
new chartjs.Tooltip({
x: Math.round(tooltipPosition.x),
y: Math.round(tooltipPosition.y),
xPadding: this.options.tooltipXPadding,
yPadding: this.options.tooltipYPadding,
fillColor: this.options.tooltipFillColor,
textColor: this.options.tooltipFontColor,
fontFamily: this.options.tooltipFontFamily,
fontStyle: this.options.tooltipFontStyle,
fontSize: this.options.tooltipFontSize,
caretHeight: this.options.tooltipCaretSize,
cornerRadius: this.options.tooltipCornerRadius,
text: helpers.template(this.options.tooltipTemplate, firstElement),
chart: this.chart,
custom: this.options.customTooltips
}).draw();
} else {
var tooltipLabels = [],
tooltipColors = [];
helpers.each(elements, function (point) {
tooltipLabels.push(helpers.template(this.options.multiTooltipTemplate, point));
tooltipColors.push({
fill: point._saved.fillColor || point.fillColor,
stroke: point._saved.strokeColor || point.strokeColor
});
}, this);
new Chart.MultiTooltip({
x: Math.round(tooltipPosition.x),
y: Math.round(tooltipPosition.y),
xPadding: this.options.tooltipXPadding,
yPadding: this.options.tooltipYPadding,
xOffset: this.options.tooltipXOffset,
fillColor: this.options.tooltipFillColor,
textColor: this.options.tooltipFontColor,
fontFamily: this.options.tooltipFontFamily,
fontStyle: this.options.tooltipFontStyle,
fontSize: this.options.tooltipFontSize,
titleTextColor: this.options.tooltipTitleFontColor,
titleFontFamily: this.options.tooltipTitleFontFamily,
titleFontStyle: this.options.tooltipTitleFontStyle,
titleFontSize: this.options.tooltipTitleFontSize,
cornerRadius: this.options.tooltipCornerRadius,
labels: tooltipLabels,
legendColors: tooltipColors,
legendColorBackground: this.options.multiTooltipKeyBackground,
title: '',
chart: this.chart,
ctx: this.chart.ctx,
custom: this.options.customTooltips
}).draw();
}
}
return this;
},
_forEachPoint: function (callback) {
helpers.each(this.datasets, function (dataset) {
helpers.each(dataset.points, callback, this);
}, this);
},
_forEachDataset: function (callback) {
helpers.each(this.datasets, callback, this);
},
_calculateRange: function () {
var xmin = undefined,
xmax = undefined,
ymin = undefined,
ymax = undefined;
this._forEachPoint(function (point) {
// min x
if (xmin === undefined || point.arg < xmin) {
xmin = point.arg;
}
// max x
if (xmax === undefined || point.arg > xmax) {
xmax = point.arg;
}
// min y
if (ymin === undefined || point.value < ymin) {
ymin = point.value;
}
// max y
if (ymax === undefined || point.value > ymax) {
ymax = point.value;
}
});
return {
xmin: xmin,
xmax: xmax,
ymin: ymin,
ymax: ymax
}
},
_drawMessage: function (message) {
var ctx = this.chart.ctx,
width = this.chart.width,
height = this.chart.height,
fontSize = this.options.scaleFontSize,
fontStyle = this.options.scaleFontStyle,
fontFamily = this.options.scaleFontFamily,
font = helpers.fontString(fontSize, fontStyle, fontFamily);
// text
ctx.save();
ctx.translate(width / 2, height / 2);
ctx.textAlign = "center";
ctx.textBaseline = "middle";
ctx.font = font;
ctx.fillStyle = this.options.scaleFontColor;
ctx.fillText(message, 0, 0);
ctx.restore();
},
_drawLine: function (dataset) {
var ctx = this.chart.ctx,
prev = undefined;
ctx.lineJoin = "round";
ctx.lineWidth = this.options.datasetStrokeWidth;
ctx.strokeStyle = dataset.strokeColor || this.options.datasetStrokeColor;
ctx.beginPath();
helpers.each(dataset.points, function (point, index) {
if (index === 0) {
ctx.moveTo(point.x, point.y);
}
else {
if (this.options.bezierCurve) {
ctx.bezierCurveTo(