621 lines
19 KiB
JavaScript
Executable File
621 lines
19 KiB
JavaScript
Executable File
"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.tooltips = {
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enabled: true,
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custom: null,
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mode: 'single',
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backgroundColor: "rgba(0,0,0,0.8)",
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titleFontFamily: Chart.defaults.global.defaultFontFamily,
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titleFontSize: Chart.defaults.global.defaultFontSize,
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titleFontStyle: "bold",
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titleSpacing: 2,
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titleMarginBottom: 6,
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titleColor: "#fff",
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titleAlign: "left",
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bodyFontFamily: Chart.defaults.global.defaultFontFamily,
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bodyFontSize: Chart.defaults.global.defaultFontSize,
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bodyFontStyle: Chart.defaults.global.defaultFontStyle,
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bodySpacing: 2,
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bodyColor: "#fff",
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bodyAlign: "left",
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footerFontFamily: Chart.defaults.global.defaultFontFamily,
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footerFontSize: Chart.defaults.global.defaultFontSize,
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footerFontStyle: "bold",
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footerSpacing: 2,
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footerMarginTop: 6,
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footerColor: "#fff",
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footerAlign: "left",
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yPadding: 6,
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xPadding: 6,
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caretSize: 5,
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cornerRadius: 6,
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multiKeyBackground: '#fff',
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callbacks: {
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// Args are: (tooltipItems, data)
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beforeTitle: helpers.noop,
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title: function(tooltipItems, data) {
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// Pick first xLabel for now
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var title = '';
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if (tooltipItems.length > 0) {
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if (tooltipItems[0].xLabel) {
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title = tooltipItems[0].xLabel;
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} else if (data.labels.length > 0 && tooltipItems[0].index < data.labels.length) {
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title = data.labels[tooltipItems[0].index];
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}
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}
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return title;
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},
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afterTitle: helpers.noop,
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// Args are: (tooltipItems, data)
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beforeBody: helpers.noop,
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// Args are: (tooltipItem, data)
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beforeLabel: helpers.noop,
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label: function(tooltipItem, data) {
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var datasetLabel = data.datasets[tooltipItem.datasetIndex].label || '';
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return datasetLabel + ': ' + tooltipItem.yLabel;
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},
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afterLabel: helpers.noop,
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// Args are: (tooltipItems, data)
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afterBody: helpers.noop,
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// Args are: (tooltipItems, data)
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beforeFooter: helpers.noop,
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footer: helpers.noop,
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afterFooter: helpers.noop
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}
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};
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// Helper to push or concat based on if the 2nd parameter is an array or not
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function pushOrConcat(base, toPush) {
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if (toPush) {
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if (helpers.isArray(toPush)) {
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base = base.concat(toPush);
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} else {
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base.push(toPush);
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}
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}
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return base;
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}
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Chart.Tooltip = Chart.Element.extend({
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initialize: function() {
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var options = this._options;
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helpers.extend(this, {
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_model: {
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// Positioning
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xPadding: options.tooltips.xPadding,
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yPadding: options.tooltips.yPadding,
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// Body
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bodyColor: options.tooltips.bodyColor,
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_bodyFontFamily: options.tooltips.bodyFontFamily,
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_bodyFontStyle: options.tooltips.bodyFontStyle,
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_bodyAlign: options.tooltips.bodyAlign,
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bodyFontSize: options.tooltips.bodyFontSize,
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bodySpacing: options.tooltips.bodySpacing,
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// Title
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titleColor: options.tooltips.titleColor,
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_titleFontFamily: options.tooltips.titleFontFamily,
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_titleFontStyle: options.tooltips.titleFontStyle,
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titleFontSize: options.tooltips.titleFontSize,
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_titleAlign: options.tooltips.titleAlign,
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titleSpacing: options.tooltips.titleSpacing,
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titleMarginBottom: options.tooltips.titleMarginBottom,
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// Footer
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footerColor: options.tooltips.footerColor,
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_footerFontFamily: options.tooltips.footerFontFamily,
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_footerFontStyle: options.tooltips.footerFontStyle,
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footerFontSize: options.tooltips.footerFontSize,
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_footerAlign: options.tooltips.footerAlign,
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footerSpacing: options.tooltips.footerSpacing,
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footerMarginTop: options.tooltips.footerMarginTop,
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// Appearance
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caretSize: options.tooltips.caretSize,
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cornerRadius: options.tooltips.cornerRadius,
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backgroundColor: options.tooltips.backgroundColor,
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opacity: 0,
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legendColorBackground: options.tooltips.multiKeyBackground
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}
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});
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},
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// Get the title
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// Args are: (tooltipItem, data)
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getTitle: function() {
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var beforeTitle = this._options.tooltips.callbacks.beforeTitle.apply(this, arguments),
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title = this._options.tooltips.callbacks.title.apply(this, arguments),
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afterTitle = this._options.tooltips.callbacks.afterTitle.apply(this, arguments);
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var lines = [];
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lines = pushOrConcat(lines, beforeTitle);
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lines = pushOrConcat(lines, title);
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lines = pushOrConcat(lines, afterTitle);
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return lines;
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},
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// Args are: (tooltipItem, data)
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getBeforeBody: function() {
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var lines = this._options.tooltips.callbacks.beforeBody.apply(this, arguments);
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return helpers.isArray(lines) ? lines : lines !== undefined ? [lines] : [];
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},
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// Args are: (tooltipItem, data)
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getBody: function(tooltipItems, data) {
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var lines = [];
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helpers.each(tooltipItems, function(bodyItem) {
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helpers.pushAllIfDefined(this._options.tooltips.callbacks.beforeLabel.call(this, bodyItem, data), lines);
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helpers.pushAllIfDefined(this._options.tooltips.callbacks.label.call(this, bodyItem, data), lines);
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helpers.pushAllIfDefined(this._options.tooltips.callbacks.afterLabel.call(this, bodyItem, data), lines);
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}, this);
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return lines;
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},
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// Args are: (tooltipItem, data)
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getAfterBody: function() {
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var lines = this._options.tooltips.callbacks.afterBody.apply(this, arguments);
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return helpers.isArray(lines) ? lines : lines !== undefined ? [lines] : [];
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},
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// Get the footer and beforeFooter and afterFooter lines
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// Args are: (tooltipItem, data)
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getFooter: function() {
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var beforeFooter = this._options.tooltips.callbacks.beforeFooter.apply(this, arguments);
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var footer = this._options.tooltips.callbacks.footer.apply(this, arguments);
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var afterFooter = this._options.tooltips.callbacks.afterFooter.apply(this, arguments);
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var lines = [];
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lines = pushOrConcat(lines, beforeFooter);
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lines = pushOrConcat(lines, footer);
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lines = pushOrConcat(lines, afterFooter);
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return lines;
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},
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getAveragePosition: function(elements) {
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if (!elements.length) {
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return false;
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}
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var xPositions = [];
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var yPositions = [];
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helpers.each(elements, function(el) {
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if (el) {
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var pos = el.tooltipPosition();
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xPositions.push(pos.x);
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yPositions.push(pos.y);
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}
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});
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var x = 0,
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y = 0;
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for (var i = 0; i < xPositions.length; i++) {
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x += xPositions[i];
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y += yPositions[i];
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}
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return {
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x: Math.round(x / xPositions.length),
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y: Math.round(y / xPositions.length)
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};
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},
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update: function(changed) {
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if (this._active.length) {
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this._model.opacity = 1;
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var element = this._active[0],
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labelColors = [],
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tooltipPosition;
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var tooltipItems = [];
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if (this._options.tooltips.mode === 'single') {
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var yScale = element._yScale || element._scale; // handle radar || polarArea charts
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tooltipItems.push({
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xLabel: element._xScale ? element._xScale.getLabelForIndex(element._index, element._datasetIndex) : '',
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yLabel: yScale ? yScale.getLabelForIndex(element._index, element._datasetIndex) : '',
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index: element._index,
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datasetIndex: element._datasetIndex
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});
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tooltipPosition = this.getAveragePosition(this._active);
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} else {
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helpers.each(this._data.datasets, function(dataset, datasetIndex) {
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if (!helpers.isDatasetVisible(dataset)) {
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return;
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}
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var currentElement = dataset.metaData[element._index];
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if (currentElement) {
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var yScale = element._yScale || element._scale; // handle radar || polarArea charts
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tooltipItems.push({
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xLabel: currentElement._xScale ? currentElement._xScale.getLabelForIndex(currentElement._index, currentElement._datasetIndex) : '',
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yLabel: yScale ? yScale.getLabelForIndex(currentElement._index, currentElement._datasetIndex) : '',
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index: element._index,
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datasetIndex: datasetIndex
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});
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}
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}, null, element._yScale.options.stacked);
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helpers.each(this._active, function(active) {
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if (active) {
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labelColors.push({
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borderColor: active._view.borderColor,
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backgroundColor: active._view.backgroundColor
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});
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}
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}, null, element._yScale.options.stacked);
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tooltipPosition = this.getAveragePosition(this._active);
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tooltipPosition.y = this._active[0]._yScale.getPixelForDecimal(0.5);
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}
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// Build the Text Lines
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helpers.extend(this._model, {
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title: this.getTitle(tooltipItems, this._data),
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beforeBody: this.getBeforeBody(tooltipItems, this._data),
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body: this.getBody(tooltipItems, this._data),
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afterBody: this.getAfterBody(tooltipItems, this._data),
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footer: this.getFooter(tooltipItems, this._data)
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});
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helpers.extend(this._model, {
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x: Math.round(tooltipPosition.x),
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y: Math.round(tooltipPosition.y),
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caretPadding: helpers.getValueOrDefault(tooltipPosition.padding, 2),
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labelColors: labelColors
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});
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// We need to determine alignment of
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var tooltipSize = this.getTooltipSize(this._model);
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this.determineAlignment(tooltipSize); // Smart Tooltip placement to stay on the canvas
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helpers.extend(this._model, this.getBackgroundPoint(this._model, tooltipSize));
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} else {
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this._model.opacity = 0;
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}
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if (changed && this._options.tooltips.custom) {
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this._options.tooltips.custom.call(this, this._model);
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}
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return this;
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},
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getTooltipSize: function getTooltipSize(vm) {
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var ctx = this._chart.ctx;
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var size = {
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height: vm.yPadding * 2, // Tooltip Padding
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width: 0
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};
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var combinedBodyLength = vm.body.length + vm.beforeBody.length + vm.afterBody.length;
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size.height += vm.title.length * vm.titleFontSize; // Title Lines
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size.height += (vm.title.length - 1) * vm.titleSpacing; // Title Line Spacing
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size.height += vm.title.length ? vm.titleMarginBottom : 0; // Title's bottom Margin
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size.height += combinedBodyLength * vm.bodyFontSize; // Body Lines
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size.height += combinedBodyLength ? (combinedBodyLength - 1) * vm.bodySpacing : 0; // Body Line Spacing
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size.height += vm.footer.length ? vm.footerMarginTop : 0; // Footer Margin
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size.height += vm.footer.length * (vm.footerFontSize); // Footer Lines
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size.height += vm.footer.length ? (vm.footer.length - 1) * vm.footerSpacing : 0; // Footer Line Spacing
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// Width
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ctx.font = helpers.fontString(vm.titleFontSize, vm._titleFontStyle, vm._titleFontFamily);
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helpers.each(vm.title, function(line) {
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size.width = Math.max(size.width, ctx.measureText(line).width);
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});
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ctx.font = helpers.fontString(vm.bodyFontSize, vm._bodyFontStyle, vm._bodyFontFamily);
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helpers.each(vm.beforeBody.concat(vm.afterBody), function(line) {
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size.width = Math.max(size.width, ctx.measureText(line).width);
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});
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helpers.each(vm.body, function(line) {
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size.width = Math.max(size.width, ctx.measureText(line).width + (this._options.tooltips.mode !== 'single' ? (vm.bodyFontSize + 2) : 0));
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}, this);
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ctx.font = helpers.fontString(vm.footerFontSize, vm._footerFontStyle, vm._footerFontFamily);
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helpers.each(vm.footer, function(line) {
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size.width = Math.max(size.width, ctx.measureText(line).width);
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});
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size.width += 2 * vm.xPadding;
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return size;
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},
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determineAlignment: function determineAlignment(size) {
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this._model.xAlign = this._model.yAlign = "center";
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if (this._model.y < size.height) {
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this._model.yAlign = 'top';
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} else if (this._model.y > (this._chart.height - size.height)) {
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this._model.yAlign = 'bottom';
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}
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var lf, rf; // functions to determine left, right alignment
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var olf, orf; // functions to determine if left/right alignment causes tooltip to go outside chart
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var yf; // function to get the y alignment if the tooltip goes outside of the left or right edges
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var _this = this;
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var midX = (this._chartInstance.chartArea.left + this._chartInstance.chartArea.right) / 2;
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var midY = (this._chartInstance.chartArea.top + this._chartInstance.chartArea.bottom) / 2;
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if (this._model.yAlign === 'center') {
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lf = function(x) {
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return x <= midX;
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};
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rf = function(x) {
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return x > midX;
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};
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} else {
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lf = function(x) {
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return x <= (size.width / 2);
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};
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rf = function(x) {
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return x >= (_this._chart.width - (size.width / 2));
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};
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}
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olf = function(x) {
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return x + size.width > _this._chart.width;
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};
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orf = function(x) {
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return x - size.width < 0;
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};
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yf = function(y) {
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return y <= midY ? 'top' : 'bottom';
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};
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if (lf(this._model.x)) {
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this._model.xAlign = 'left';
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// Is tooltip too wide and goes over the right side of the chart.?
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if (olf(this._model.x)) {
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this._model.xAlign = 'center';
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this._model.yAlign = yf(this._model.y);
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}
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} else if (rf(this._model.x)) {
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this._model.xAlign = 'right';
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// Is tooltip too wide and goes outside left edge of canvas?
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if (orf(this._model.x)) {
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this._model.xAlign = 'center';
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this._model.yAlign = yf(this._model.y);
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}
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}
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},
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getBackgroundPoint: function getBackgroundPoint(vm, size) {
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// Background Position
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var pt = {
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x: vm.x,
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y: vm.y
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};
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if (vm.xAlign === 'right') {
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pt.x -= size.width;
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} else if (vm.xAlign === 'center') {
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pt.x -= (size.width / 2);
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}
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if (vm.yAlign === 'top') {
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pt.y += vm.caretPadding + vm.caretSize;
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} else if (vm.yAlign === 'bottom') {
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pt.y -= size.height + vm.caretPadding + vm.caretSize;
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} else {
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pt.y -= (size.height / 2);
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}
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if (vm.yAlign === 'center') {
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if (vm.xAlign === 'left') {
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pt.x += vm.caretPadding + vm.caretSize;
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} else if (vm.xAlign === 'right') {
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pt.x -= vm.caretPadding + vm.caretSize;
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}
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} else {
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if (vm.xAlign === 'left') {
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pt.x -= vm.cornerRadius + vm.caretPadding;
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} else if (vm.xAlign === 'right') {
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pt.x += vm.cornerRadius + vm.caretPadding;
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}
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}
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return pt;
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},
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drawCaret: function drawCaret(tooltipPoint, size, opacity, caretPadding) {
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var vm = this._view;
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var ctx = this._chart.ctx;
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var x1, x2, x3;
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var y1, y2, y3;
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if (vm.yAlign === 'center') {
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// Left or right side
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if (vm.xAlign === 'left') {
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x1 = tooltipPoint.x;
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x2 = x1 - vm.caretSize;
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x3 = x1;
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} else {
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x1 = tooltipPoint.x + size.width;
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x2 = x1 + vm.caretSize;
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x3 = x1;
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}
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y2 = tooltipPoint.y + (size.height / 2);
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y1 = y2 - vm.caretSize;
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y3 = y2 + vm.caretSize;
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} else {
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if (vm.xAlign === 'left') {
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x1 = tooltipPoint.x + vm.cornerRadius;
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x2 = x1 + vm.caretSize;
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x3 = x2 + vm.caretSize;
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} else if (vm.xAlign === 'right') {
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x1 = tooltipPoint.x + size.width - vm.cornerRadius;
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x2 = x1 - vm.caretSize;
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x3 = x2 - vm.caretSize;
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} else {
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x2 = tooltipPoint.x + (size.width / 2);
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x1 = x2 - vm.caretSize;
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x3 = x2 + vm.caretSize;
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}
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if (vm.yAlign === 'top') {
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y1 = tooltipPoint.y;
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y2 = y1 - vm.caretSize;
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y3 = y1;
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} else {
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y1 = tooltipPoint.y + size.height;
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y2 = y1 + vm.caretSize;
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y3 = y1;
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}
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}
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var bgColor = helpers.color(vm.backgroundColor);
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ctx.fillStyle = bgColor.alpha(opacity * bgColor.alpha()).rgbString();
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ctx.beginPath();
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ctx.moveTo(x1, y1);
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ctx.lineTo(x2, y2);
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ctx.lineTo(x3, y3);
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ctx.closePath();
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ctx.fill();
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},
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drawTitle: function drawTitle(pt, vm, ctx, opacity) {
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if (vm.title.length) {
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ctx.textAlign = vm._titleAlign;
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ctx.textBaseline = "top";
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var titleColor = helpers.color(vm.titleColor);
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ctx.fillStyle = titleColor.alpha(opacity * titleColor.alpha()).rgbString();
|
|
ctx.font = helpers.fontString(vm.titleFontSize, vm._titleFontStyle, vm._titleFontFamily);
|
|
|
|
helpers.each(vm.title, function(title, i) {
|
|
ctx.fillText(title, pt.x, pt.y);
|
|
pt.y += vm.titleFontSize + vm.titleSpacing; // Line Height and spacing
|
|
|
|
if (i + 1 === vm.title.length) {
|
|
pt.y += vm.titleMarginBottom - vm.titleSpacing; // If Last, add margin, remove spacing
|
|
}
|
|
});
|
|
}
|
|
},
|
|
drawBody: function drawBody(pt, vm, ctx, opacity) {
|
|
ctx.textAlign = vm._bodyAlign;
|
|
ctx.textBaseline = "top";
|
|
|
|
var bodyColor = helpers.color(vm.bodyColor);
|
|
ctx.fillStyle = bodyColor.alpha(opacity * bodyColor.alpha()).rgbString();
|
|
ctx.font = helpers.fontString(vm.bodyFontSize, vm._bodyFontStyle, vm._bodyFontFamily);
|
|
|
|
// Before Body
|
|
helpers.each(vm.beforeBody, function(beforeBody) {
|
|
ctx.fillText(beforeBody, pt.x, pt.y);
|
|
pt.y += vm.bodyFontSize + vm.bodySpacing;
|
|
});
|
|
|
|
helpers.each(vm.body, function(body, i) {
|
|
// Draw Legend-like boxes if needed
|
|
if (this._options.tooltips.mode !== 'single') {
|
|
// Fill a white rect so that colours merge nicely if the opacity is < 1
|
|
ctx.fillStyle = helpers.color(vm.legendColorBackground).alpha(opacity).rgbaString();
|
|
ctx.fillRect(pt.x, pt.y, vm.bodyFontSize, vm.bodyFontSize);
|
|
|
|
// Border
|
|
ctx.strokeStyle = helpers.color(vm.labelColors[i].borderColor).alpha(opacity).rgbaString();
|
|
ctx.strokeRect(pt.x, pt.y, vm.bodyFontSize, vm.bodyFontSize);
|
|
|
|
// Inner square
|
|
ctx.fillStyle = helpers.color(vm.labelColors[i].backgroundColor).alpha(opacity).rgbaString();
|
|
ctx.fillRect(pt.x + 1, pt.y + 1, vm.bodyFontSize - 2, vm.bodyFontSize - 2);
|
|
|
|
ctx.fillStyle = helpers.color(vm.bodyColor).alpha(opacity).rgbaString(); // Return fill style for text
|
|
}
|
|
|
|
// Body Line
|
|
ctx.fillText(body, pt.x + (this._options.tooltips.mode !== 'single' ? (vm.bodyFontSize + 2) : 0), pt.y);
|
|
|
|
pt.y += vm.bodyFontSize + vm.bodySpacing;
|
|
}, this);
|
|
|
|
// After Body
|
|
helpers.each(vm.afterBody, function(afterBody) {
|
|
ctx.fillText(afterBody, pt.x, pt.y);
|
|
pt.y += vm.bodyFontSize;
|
|
});
|
|
|
|
pt.y -= vm.bodySpacing; // Remove last body spacing
|
|
},
|
|
drawFooter: function drawFooter(pt, vm, ctx, opacity) {
|
|
if (vm.footer.length) {
|
|
pt.y += vm.footerMarginTop;
|
|
|
|
ctx.textAlign = vm._footerAlign;
|
|
ctx.textBaseline = "top";
|
|
|
|
var footerColor = helpers.color(vm.footerColor);
|
|
ctx.fillStyle = footerColor.alpha(opacity * footerColor.alpha()).rgbString();
|
|
ctx.font = helpers.fontString(vm.footerFontSize, vm._footerFontStyle, vm._footerFontFamily);
|
|
|
|
helpers.each(vm.footer, function(footer) {
|
|
ctx.fillText(footer, pt.x, pt.y);
|
|
pt.y += vm.footerFontSize + vm.footerSpacing;
|
|
});
|
|
}
|
|
},
|
|
draw: function draw() {
|
|
var ctx = this._chart.ctx;
|
|
var vm = this._view;
|
|
|
|
if (vm.opacity === 0) {
|
|
return;
|
|
}
|
|
|
|
var caretPadding = vm.caretPadding;
|
|
var tooltipSize = this.getTooltipSize(vm);
|
|
var pt = {
|
|
x: vm.x,
|
|
y: vm.y
|
|
};
|
|
|
|
// IE11/Edge does not like very small opacities, so snap to 0
|
|
var opacity = Math.abs(vm.opacity < 1e-3) ? 0 : vm.opacity;
|
|
|
|
if (this._options.tooltips.enabled) {
|
|
// Draw Background
|
|
var bgColor = helpers.color(vm.backgroundColor);
|
|
ctx.fillStyle = bgColor.alpha(opacity * bgColor.alpha()).rgbString();
|
|
helpers.drawRoundedRectangle(ctx, pt.x, pt.y, tooltipSize.width, tooltipSize.height, vm.cornerRadius);
|
|
ctx.fill();
|
|
|
|
// Draw Caret
|
|
this.drawCaret(pt, tooltipSize, opacity, caretPadding);
|
|
|
|
// Draw Title, Body, and Footer
|
|
pt.x += vm.xPadding;
|
|
pt.y += vm.yPadding;
|
|
|
|
// Titles
|
|
this.drawTitle(pt, vm, ctx, opacity);
|
|
|
|
// Body
|
|
this.drawBody(pt, vm, ctx, opacity);
|
|
|
|
// Footer
|
|
this.drawFooter(pt, vm, ctx, opacity);
|
|
}
|
|
}
|
|
});
|
|
};
|