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205 lines
4.9 KiB
JavaScript
205 lines
4.9 KiB
JavaScript
"use strict";
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module.exports = function(Chart) {
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var helpers = Chart.helpers;
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Chart.defaults.global.title = {
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display: false,
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position: 'top',
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fullWidth: true, // marks that this box should take the full width of the canvas (pushing down other boxes)
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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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};
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var noop = helpers.noop;
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Chart.Title = Chart.Element.extend({
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initialize: function(config) {
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var me = this;
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helpers.extend(me, config);
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me.options = helpers.configMerge(Chart.defaults.global.title, config.options);
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// Contains hit boxes for each dataset (in dataset order)
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me.legendHitBoxes = [];
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},
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// These methods are ordered by lifecyle. Utilities then follow.
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beforeUpdate: function () {
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var chartOpts = this.chart.options;
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if (chartOpts && chartOpts.title) {
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this.options = helpers.configMerge(Chart.defaults.global.title, chartOpts.title);
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}
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},
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update: function(maxWidth, maxHeight, margins) {
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var me = this;
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// Update Lifecycle - Probably don't want to ever extend or overwrite this function ;)
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me.beforeUpdate();
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// Absorb the master measurements
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me.maxWidth = maxWidth;
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me.maxHeight = maxHeight;
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me.margins = margins;
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// Dimensions
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me.beforeSetDimensions();
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me.setDimensions();
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me.afterSetDimensions();
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// Labels
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me.beforeBuildLabels();
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me.buildLabels();
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me.afterBuildLabels();
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// Fit
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me.beforeFit();
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me.fit();
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me.afterFit();
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//
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me.afterUpdate();
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return me.minSize;
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},
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afterUpdate: noop,
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//
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beforeSetDimensions: noop,
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setDimensions: function() {
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var me = this;
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// Set the unconstrained dimension before label rotation
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if (me.isHorizontal()) {
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// Reset position before calculating rotation
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me.width = me.maxWidth;
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me.left = 0;
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me.right = me.width;
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} else {
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me.height = me.maxHeight;
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// Reset position before calculating rotation
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me.top = 0;
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me.bottom = me.height;
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}
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// Reset padding
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me.paddingLeft = 0;
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me.paddingTop = 0;
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me.paddingRight = 0;
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me.paddingBottom = 0;
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// Reset minSize
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me.minSize = {
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width: 0,
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height: 0
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};
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},
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afterSetDimensions: noop,
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//
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beforeBuildLabels: noop,
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buildLabels: noop,
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afterBuildLabels: noop,
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//
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beforeFit: noop,
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fit: function() {
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var me = this,
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valueOrDefault = helpers.getValueOrDefault,
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opts = me.options,
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globalDefaults = Chart.defaults.global,
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display = opts.display,
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fontSize = valueOrDefault(opts.fontSize, globalDefaults.defaultFontSize),
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minSize = me.minSize;
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if (me.isHorizontal()) {
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minSize.width = me.maxWidth; // fill all the width
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minSize.height = display ? fontSize + (opts.padding * 2) : 0;
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} else {
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minSize.width = display ? fontSize + (opts.padding * 2) : 0;
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minSize.height = me.maxHeight; // fill all the height
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}
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me.width = minSize.width;
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me.height = minSize.height;
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},
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afterFit: noop,
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// Shared Methods
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isHorizontal: function() {
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var pos = this.options.position;
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return pos === "top" || pos === "bottom";
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},
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// Actualy draw the title block on the canvas
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draw: function() {
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var me = this,
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ctx = me.ctx,
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valueOrDefault = helpers.getValueOrDefault,
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opts = me.options,
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globalDefaults = Chart.defaults.global;
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if (opts.display) {
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var fontSize = valueOrDefault(opts.fontSize, globalDefaults.defaultFontSize),
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fontStyle = valueOrDefault(opts.fontStyle, globalDefaults.defaultFontStyle),
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fontFamily = valueOrDefault(opts.fontFamily, globalDefaults.defaultFontFamily),
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titleFont = helpers.fontString(fontSize, fontStyle, fontFamily),
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rotation = 0,
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titleX,
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titleY,
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top = me.top,
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left = me.left,
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bottom = me.bottom,
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right = me.right;
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ctx.fillStyle = valueOrDefault(opts.fontColor, globalDefaults.defaultFontColor); // render in correct colour
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ctx.font = titleFont;
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// Horizontal
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if (me.isHorizontal()) {
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titleX = left + ((right - left) / 2); // midpoint of the width
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titleY = top + ((bottom - top) / 2); // midpoint of the height
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} else {
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titleX = opts.position === 'left' ? left + (fontSize / 2) : right - (fontSize / 2);
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titleY = top + ((bottom - top) / 2);
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rotation = Math.PI * (opts.position === 'left' ? -0.5 : 0.5);
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}
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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.textBaseline = 'middle';
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ctx.fillText(opts.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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// Register the title plugin
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Chart.plugins.register({
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beforeInit: function(chartInstance) {
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var opts = chartInstance.options;
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var titleOpts = opts.title;
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if (titleOpts) {
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chartInstance.titleBlock = new Chart.Title({
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ctx: chartInstance.chart.ctx,
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options: titleOpts,
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chart: chartInstance
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});
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Chart.layoutService.addBox(chartInstance, chartInstance.titleBlock);
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}
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}
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});
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};
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