mirror of
https://github.com/chartjs/Chart.js.git
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272 lines
7.0 KiB
JavaScript
272 lines
7.0 KiB
JavaScript
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(function() {
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"use strict";
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var root = this,
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Chart = root.Chart,
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helpers = Chart.helpers;
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Chart.defaults.legend = {
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display: true,
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position: 'top',
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onClick: false, // a callback will override the default behavior of toggling the datasets
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title: {
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position: 'top',
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fontColor: '#666',
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fontFamily: 'Helvetica Neue',
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fontSize: 12,
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fontStyle: 'bold',
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padding: 10,
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// actual title
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text: '',
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// display property
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display: false,
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},
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labels: {
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fontSize: 12,
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fontStyle: "normal",
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fontColor: "#666",
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fontFamily: "Helvetica Neue",
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padding: 10,
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reverse: false,
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display: true,
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callback: function(value) {
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return '' + value;
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},
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},
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};
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Chart.Legend = Chart.Element.extend({
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initialize: function(config) {
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helpers.extend(this, config);
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this.options = helpers.configMerge(Chart.defaults.legend, config.options);
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},
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// These methods are ordered by lifecyle. Utilities then follow.
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// Any function defined here is inherited by all legend types.
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// Any function can be extended by the legend type
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beforeUpdate: helpers.noop,
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update: function(maxWidth, maxHeight, margins) {
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// Update Lifecycle - Probably don't want to ever extend or overwrite this function ;)
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this.beforeUpdate();
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// Absorb the master measurements
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this.maxWidth = maxWidth;
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this.maxHeight = maxHeight;
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this.margins = margins;
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// Dimensions
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this.beforeSetDimensions();
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this.setDimensions();
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this.afterSetDimensions();
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// Labels
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this.beforeBuildLabels();
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this.buildLabels();
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this.afterBuildLabels();
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// Fit
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this.beforeFit();
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this.fit();
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this.afterFit();
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//
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this.afterUpdate();
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return this.minSize;
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},
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afterUpdate: helpers.noop,
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//
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beforeSetDimensions: helpers.noop,
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setDimensions: function() {
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// Set the unconstrained dimension before label rotation
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if (this.isHorizontal()) {
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// Reset position before calculating rotation
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this.width = this.maxWidth;
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this.left = 0;
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this.right = this.width;
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} else {
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this.height = this.maxHeight;
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// Reset position before calculating rotation
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this.top = 0;
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this.bottom = this.height;
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}
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// Reset padding
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this.paddingLeft = 0;
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this.paddingTop = 0;
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this.paddingRight = 0;
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this.paddingBottom = 0;
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},
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afterSetDimensions: helpers.noop,
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//
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beforeBuildLabels: helpers.noop,
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buildLabels: function() {
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// Convert ticks to strings
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this.labels = this.chart.data.datasets.map(function(dataset) {
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return this.options.labels.callback.call(this, dataset.label);
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}, this);
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},
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afterBuildLabels: helpers.noop,
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//
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beforeFit: helpers.noop,
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fit: function() {
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var ctx = this.ctx;
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var titleFont = helpers.fontString(this.options.title.fontSize, this.options.title.fontStyle, this.options.title.fontFamily);
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var labelFont = helpers.fontString(this.options.labels.fontSize, this.options.labels.fontStyle, this.options.labels.fontFamily);
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this.minSize = {
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width: 0,
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height: 0,
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};
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// Legends can use all available space by default as no alignment to the chartArea is necessary
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// Width
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if (this.isHorizontal()) {
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this.minSize.width = this.maxWidth; // fill all the width
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} else {
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this.minSize.width = this.options.display ? 10 : 0;
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}
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// height
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if (this.isHorizontal()) {
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this.minSize.height = this.options.display ? 10 : 0;
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} else {
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this.minSize.height = this.maxHeight; // fill all the height
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}
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// Increase sizes here
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if (this.isHorizontal()) {
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// Title
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if (this.options.title.display) {
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this.minSize.height += this.options.title.fontSize + (this.options.title.padding * 2);
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}
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// Labels
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var totalWidth = 0;
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var totalHeight = this.labels.length ? this.options.labels.fontSize + (this.options.labels.padding) : 0;
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ctx.font = labelFont;
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helpers.each(this.labels, function(label, i) {
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var width = ctx.measureText(label).width;
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if (totalWidth + width > this.width) {
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totalHeight += this.options.labels.fontSize + (this.options.labels.padding);
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totalWidth = 0;
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}
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totalWidth += width + this.options.labels.padding;
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}, this);
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this.minSize.height += totalHeight;
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} else {
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// TODO vertical
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}
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this.width = this.minSize.width;
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this.height = this.minSize.height;
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},
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afterFit: helpers.noop,
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// Shared Methods
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isHorizontal: function() {
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return this.options.position == "top" || this.options.position == "bottom";
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},
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// Actualy draw the legend on the canvas
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draw: function() {
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if (this.options.display) {
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var ctx = this.ctx;
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var cursor = {
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x: this.left,
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y: this.top,
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};
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// Horizontal
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if (this.isHorizontal()) {
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// Title Spacing if on top
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if (this.options.title.display && this.options.title.position == 'top') {
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cursor.y += this.options.title.fontSize + (this.options.title.padding * 2);
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}
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// Labels
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ctx.textAlign = "left";
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ctx.textBaseline = 'top';
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ctx.fillStyle = this.options.labels.fontColor; // render in correct colour
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ctx.font = helpers.fontString(this.options.labels.fontSize, this.options.labels.fontStyle, this.options.labels.fontFamily);
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helpers.each(this.labels, function(label, i) {
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var width = ctx.measureText(label).width;
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if (cursor.x + width > this.width) {
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cursor.y += this.options.labels.fontSize + (this.options.labels.padding);
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cursor.x = this.left;
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}
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ctx.fillText(label, cursor.x, cursor.y);
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cursor.x += width + (this.options.labels.padding);
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}, this);
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// Title
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if (this.options.title.display) {
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ctx.textAlign = "center";
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ctx.textBaseline = 'middle';
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ctx.fillStyle = this.options.title.fontColor; // render in correct colour
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ctx.font = helpers.fontString(this.options.title.fontSize, this.options.title.fontStyle, this.options.title.fontFamily);
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var titleX = this.left + ((this.right - this.left) / 2); // midpoint of the width
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var titleY = this.options.position == 'bottom' ? this.bottom - (this.options.title.fontSize / 2) - this.options.title.padding : this.top + (this.options.title.fontSize / 2) + this.options.title.padding;
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ctx.fillText(this.options.title.text, titleX, titleY);
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}
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} else {
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// Title
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if (this.options.title.display) {
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// Draw the legend label
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titleX = this.options.position == 'left' ? this.left + (this.options.title.fontSize / 2) : this.right - (this.options.title.fontSize / 2);
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titleY = this.top + ((this.bottom - this.top) / 2);
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var rotation = this.options.position == 'left' ? -0.5 * Math.PI : 0.5 * Math.PI;
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ctx.save();
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ctx.translate(titleX, titleY);
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ctx.rotate(rotation);
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ctx.textAlign = "center";
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ctx.fillStyle = this.options.title.fontColor; // render in correct colour
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ctx.font = helpers.fontString(this.options.title.fontSize, this.options.title.fontStyle, this.options.title.fontFamily);
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ctx.textBaseline = 'middle';
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ctx.fillText(this.options.title.text, 0, 0);
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ctx.restore();
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}
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}
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}
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}
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});
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}).call(this);
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