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Allow setting dynamic font size or array of font sizes #101

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1a9b647
Allow setting dynamic fontSize
deanylev Jul 22, 2019
341827e
Update README
deanylev Jul 22, 2019
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10 changes: 5 additions & 5 deletions README.md
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Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -5,7 +5,7 @@ Chart.js plugin to display labels on pie, doughnut and polar area chart. Origina
[Demo](http://emn178.github.io/chartjs-plugin-labels/samples/demo/)

## Download
[Compress](https://raw.github.com/emn178/chartjs-plugin-labels/master/build/chartjs-plugin-labels.min.js)
[Compress](https://raw.github.com/emn178/chartjs-plugin-labels/master/build/chartjs-plugin-labels.min.js)
[Uncompress](https://raw.github.com/emn178/chartjs-plugin-labels/master/src/chartjs-plugin-labels.js)

## CDN Link
Expand All @@ -24,8 +24,8 @@ Or node.js, you can use this command to install:
npm install chartjs-plugin-labels

## Notice
v1.0.0 has breaking changes. Please see [CHANGELOG v1.0.0](https://github.com/emn178/chartjs-plugin-labels/blob/master/CHANGELOG.md#v170--2018-08-19)
v0.7.0 has deprecated options. Please see [CHANGELOG v0.7.0](https://github.com/emn178/chartjs-plugin-labels/blob/master/CHANGELOG.md#v070--2017-08-03)
v1.0.0 has breaking changes. Please see [CHANGELOG v1.0.0](https://github.com/emn178/chartjs-plugin-labels/blob/master/CHANGELOG.md#v170--2018-08-19)
v0.7.0 has deprecated options. Please see [CHANGELOG v0.7.0](https://github.com/emn178/chartjs-plugin-labels/blob/master/CHANGELOG.md#v070--2017-08-03)
v0.4.0 has breaking changes. Please see [CHANGELOG v0.4.0](https://github.com/emn178/chartjs-plugin-labels/blob/master/CHANGELOG.md#v040--2017-05-26)

## Usage
Expand All @@ -46,7 +46,7 @@ new Chart(ctx, {
// identifies whether or not labels of value 0 are displayed, default is false
showZero: true,

// font size, default is defaultFontSize
// font size, can be size array for each data or function for dynamic size, default is defaultFontSize
fontSize: 12,

// font color, can be color array for each data or function for dynamic color, default is defaultFontColor
Expand Down Expand Up @@ -165,5 +165,5 @@ import 'chartjs-plugin-labels';
The project is released under the [MIT license](http://www.opensource.org/licenses/MIT).

## Contact
The project's website is located at https://github.com/emn178/chartjs-plugin-labels
The project's website is located at https://github.com/emn178/chartjs-plugin-labels
Author: Chen, Yi-Cyuan ([email protected])
64 changes: 38 additions & 26 deletions src/chartjs-plugin-labels.js
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Original file line number Diff line number Diff line change
Expand Up @@ -97,9 +97,9 @@
}
var ctx = this.ctx;
ctx.save();
ctx.font = Chart.helpers.fontString(this.options.fontSize, this.options.fontStyle, this.options.fontFamily);
var renderInfo = this.getRenderInfo(element, label);
if (!this.drawable(element, label, renderInfo)) {
ctx.font = Chart.helpers.fontString(this.getFontSize(index), this.options.fontStyle, this.options.fontFamily);
var renderInfo = this.getRenderInfo(element, label, index);
if (!this.drawable(element, label, renderInfo, index)) {
ctx.restore();
return;
}
Expand All @@ -109,11 +109,11 @@
ctx.restore();
};

Label.prototype.renderLabel = function (label, renderInfo) {
return this.options.arc ? this.renderArcLabel(label, renderInfo) : this.renderBaseLabel(label, renderInfo);
Label.prototype.renderLabel = function (label, renderInfo, index) {
return this.options.arc ? this.renderArcLabel(label, renderInfo, index) : this.renderBaseLabel(label, renderInfo, index);
};

Label.prototype.renderBaseLabel = function (label, position) {
Label.prototype.renderBaseLabel = function (label, position, index) {
var ctx = this.ctx;
if (typeof label === 'object') {
ctx.drawImage(label, position.x - label.width / 2, position.y - label.height / 2, label.width, label.height);
Expand All @@ -131,14 +131,14 @@

var lines = label.split('\n');
for (var i = 0; i < lines.length; i++) {
var y = position.y - this.options.fontSize / 2 * lines.length + this.options.fontSize * i;
var y = position.y - this.getFontSize(index) / 2 * lines.length + this.getFontSize(index) * i;
ctx.fillText(lines[i], position.x, y);
}
ctx.restore();
}
};

Label.prototype.renderArcLabel = function (label, renderInfo) {
Label.prototype.renderArcLabel = function (label, renderInfo, index) {
var ctx = this.ctx, radius = renderInfo.radius, view = renderInfo.view;
ctx.save();
ctx.translate(view.x, view.y);
Expand All @@ -148,7 +148,7 @@
ctx.textAlign = 'left';
var lines = label.split('\n'), max = 0, widths = [], offset = 0;
if (this.options.position === 'border') {
offset = (lines.length - 1) * this.options.fontSize / 2;
offset = (lines.length - 1) * this.getFontSize(index) / 2;
}
for (var j = 0; j < lines.length; ++j) {
var mertrics = ctx.measureText(lines[j]);
Expand All @@ -159,7 +159,7 @@
}
for (var j = 0; j < lines.length; ++j) {
var line = lines[j];
var y = (lines.length - 1 - j) * -this.options.fontSize + offset;
var y = (lines.length - 1 - j) * -this.getFontSize(index) + offset;
ctx.save();
var padding = (max - widths[j]) / 2;
ctx.rotate(padding / radius);
Expand All @@ -177,7 +177,7 @@
} else {
ctx.rotate((view.startAngle + Math.PI / 2 + renderInfo.endAngle) / 2);
ctx.translate(0, -1 * radius);
this.renderLabel(label, { x: 0, y: 0 });
this.renderLabel(label, { x: 0, y: 0 }, index);
}
ctx.restore();
};
Expand Down Expand Up @@ -241,6 +241,18 @@
return fontColor;
};

Label.prototype.getFontSize = function (index) {
var fontSize = this.options.fontSize;
if (typeof fontSize === 'function') {
fontSize = fontSize({
chart: this.chart
});
} else if (typeof fontSize !== 'number') {
fontSize = fontSize[index] || this.chart.config.options.defaultFontSize;
}
return fontSize;
};

Label.prototype.getPercentage = function (dataset, element, index) {
if (this.percentage !== null) {
return this.percentage;
Expand Down Expand Up @@ -283,15 +295,15 @@
return percentage;
};

Label.prototype.getRenderInfo = function (element, label) {
Label.prototype.getRenderInfo = function (element, label, index) {
if (this.chart.config.type === 'bar') {
return this.getBarRenderInfo(element, label);
return this.getBarRenderInfo(element, label, index);
} else {
return this.options.arc ? this.getArcRenderInfo(element, label) : this.getBaseRenderInfo(element, label);
return this.options.arc ? this.getArcRenderInfo(element, label, index) : this.getBaseRenderInfo(element, label, index);
}
};

Label.prototype.getBaseRenderInfo = function (element, label) {
Label.prototype.getBaseRenderInfo = function (element, label, index) {
if (this.options.position === 'outside' || this.options.position === 'border') {
var renderInfo, rangeFromCentre,
view = element._view,
Expand All @@ -307,7 +319,7 @@
y: view.y + (Math.sin(centreAngle) * rangeFromCentre)
};
if (this.options.position === 'outside') {
var offset = this.options.textMargin + this.measureLabel(label).width / 2;
var offset = this.options.textMargin + this.measureLabel(label, index).width / 2;
renderInfo.x += renderInfo.x < view.x ? -offset : offset;
}
return renderInfo;
Expand All @@ -316,10 +328,10 @@
}
};

Label.prototype.getArcRenderInfo = function (element, label) {
Label.prototype.getArcRenderInfo = function (element, label, index) {
var radius, view = element._view;
if (this.options.position === 'outside') {
radius = view.outerRadius + this.options.fontSize + this.options.textMargin;
radius = view.outerRadius + this.getFontSize(index) + this.options.textMargin;
} else if (this.options.position === 'border') {
radius = (view.outerRadius / 2 + view.outerRadius) / 2;
} else {
Expand All @@ -329,7 +341,7 @@
var totalAngle = endAngle - startAngle;
startAngle += Math.PI / 2;
endAngle += Math.PI / 2;
var mertrics = this.measureLabel(label);
var mertrics = this.measureLabel(label, index);
startAngle += (endAngle - (mertrics.width / radius + startAngle)) / 2;
return {
radius: radius,
Expand All @@ -340,19 +352,19 @@
}
};

Label.prototype.getBarRenderInfo = function (element, label) {
Label.prototype.getBarRenderInfo = function (element, label, index) {
var renderInfo = element.tooltipPosition();
renderInfo.y -= this.measureLabel(label).height / 2 + this.options.textMargin;
renderInfo.y -= this.measureLabel(label, index).height / 2 + this.options.textMargin;
return renderInfo;
};

Label.prototype.drawable = function (element, label, renderInfo) {
Label.prototype.drawable = function (element, label, renderInfo, index) {
if (this.options.overlap) {
return true;
} else if (this.options.arc) {
return renderInfo.endAngle - renderInfo.startAngle <= renderInfo.totalAngle;
} else {
var mertrics = this.measureLabel(label),
var mertrics = this.measureLabel(label, index),
left = renderInfo.x - mertrics.width / 2,
right = renderInfo.x + mertrics.width / 2,
top = renderInfo.y - mertrics.height / 2,
Expand Down Expand Up @@ -406,7 +418,7 @@
return true;
};

Label.prototype.measureLabel = function (label) {
Label.prototype.measureLabel = function (label, index) {
if (typeof label === 'object') {
return { width: label.width, height: label.height };
} else {
Expand All @@ -418,7 +430,7 @@
width = result.width;
}
}
return { width: width, height: this.options.fontSize * lines.length };
return { width: width, height: this.getFontSize(index) * lines.length };
}
};

Expand Down Expand Up @@ -451,7 +463,7 @@
label.setup(chart, options[i]);
if (label.options.position === 'outside') {
someOutside = true;
var padding = label.options.fontSize * 1.5 + label.options.outsidePadding;
var padding = this.getFontSize(i) * 1.5 + label.options.outsidePadding;
if (padding > maxPadding) {
maxPadding = padding;
}
Expand Down