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import WxCanvas from './wx-canvas';
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import * as echarts from './echarts';
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let ctx;
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function compareVersion(v1, v2) {
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v1 = v1.split('.')
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v2 = v2.split('.')
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const len = Math.max(v1.length, v2.length)
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while (v1.length < len) {
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v1.push('0')
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}
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while (v2.length < len) {
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v2.push('0')
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}
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for (let i = 0; i < len; i++) {
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const num1 = parseInt(v1[i])
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const num2 = parseInt(v2[i])
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if (num1 > num2) {
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return 1
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} else if (num1 < num2) {
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return -1
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}
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}
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return 0
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}
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Component({
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properties: {
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canvasId: {
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type: String,
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value: 'ec-canvas'
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},
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ec: {
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type: Object
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},
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forceUseOldCanvas: {
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type: Boolean,
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value: false
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}
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},
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data: {
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isUseNewCanvas: false
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},
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ready: function () {
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// Disable prograssive because drawImage doesn't support DOM as parameter
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// See https://developers.weixin.qq.com/miniprogram/dev/api/canvas/CanvasContext.drawImage.html
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echarts.registerPreprocessor(option => {
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if (option && option.series) {
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if (option.series.length > 0) {
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option.series.forEach(series => {
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series.progressive = 0;
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});
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}
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else if (typeof option.series === 'object') {
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option.series.progressive = 0;
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}
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}
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});
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if (!this.data.ec) {
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console.warn('组件需绑定 ec 变量，例：<ec-canvas id="mychart-dom-bar" '
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+ 'canvas-id="mychart-bar" ec="{{ ec }}"></ec-canvas>');
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return;
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}
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if (!this.data.ec.lazyLoad) {
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this.init();
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}
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},
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methods: {
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init: function (callback) {
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const version = wx.getSystemInfoSync().SDKVersion
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const canUseNewCanvas = compareVersion(version, '2.9.0') >= 0;
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const forceUseOldCanvas = this.data.forceUseOldCanvas;
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const isUseNewCanvas = canUseNewCanvas && !forceUseOldCanvas;
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this.setData({ isUseNewCanvas });
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if (forceUseOldCanvas && canUseNewCanvas) {
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console.warn('开发者强制使用旧canvas,建议关闭');
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}
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if (isUseNewCanvas) {
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// console.log('微信基础库版本大于2.9.0，开始使用<canvas type="2d"/>');
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// 2.9.0 可以使用 <canvas type="2d"></canvas>
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this.initByNewWay(callback);
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} else {
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const isValid = compareVersion(version, '1.9.91') >= 0
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if (!isValid) {
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console.error('微信基础库版本过低，需大于等于 1.9.91。'
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+ '参见：https://github.com/ecomfe/echarts-for-weixin'
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+ '#%E5%BE%AE%E4%BF%A1%E7%89%88%E6%9C%AC%E8%A6%81%E6%B1%82');
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return;
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} else {
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console.warn('建议将微信基础库调整大于等于2.9.0版本。升级后绘图将有更好性能');
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this.initByOldWay(callback);
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}
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}
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},
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initByOldWay(callback) {
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// 1.9.91 <= version < 2.9.0：原来的方式初始化
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ctx = wx.createCanvasContext(this.data.canvasId, this);
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const canvas = new WxCanvas(ctx, this.data.canvasId, false);
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if (echarts.setPlatformAPI) {
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echarts.setPlatformAPI({
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createCanvas: () => canvas,
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});
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} else {
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echarts.setCanvasCreator(() => canvas);
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};
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// const canvasDpr = wx.getSystemInfoSync().pixelRatio // 微信旧的canvas不能传入dpr
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const canvasDpr = 1
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var query = wx.createSelectorQuery().in(this);
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query.select('.ec-canvas').boundingClientRect(res => {
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if (typeof callback === 'function') {
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this.chart = callback(canvas, res.width, res.height, canvasDpr);
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}
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else if (this.data.ec && typeof this.data.ec.onInit === 'function') {
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this.chart = this.data.ec.onInit(canvas, res.width, res.height, canvasDpr);
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}
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else {
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this.triggerEvent('init', {
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canvas: canvas,
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width: res.width,
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height: res.height,
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canvasDpr: canvasDpr // 增加了dpr，可方便外面echarts.init
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});
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}
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}).exec();
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},
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initByNewWay(callback) {
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// version >= 2.9.0：使用新的方式初始化
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const query = wx.createSelectorQuery().in(this)
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query
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.select('.ec-canvas')
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.fields({ node: true, size: true })
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.exec(res => {
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const canvasNode = res[0].node
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this.canvasNode = canvasNode
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const canvasDpr = wx.getSystemInfoSync().pixelRatio
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const canvasWidth = res[0].width
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const canvasHeight = res[0].height
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const ctx = canvasNode.getContext('2d')
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const canvas = new WxCanvas(ctx, this.data.canvasId, true, canvasNode)
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if (echarts.setPlatformAPI) {
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echarts.setPlatformAPI({
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createCanvas: () => canvas,
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loadImage: (src, onload, onerror) => {
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if (canvasNode.createImage) {
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const image = canvasNode.createImage();
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image.onload = onload;
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image.onerror = onerror;
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image.src = src;
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return image;
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}
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console.error('加载图片依赖 `Canvas.createImage()` API，要求小程序基础库版本在 2.7.0 及以上。');
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// PENDING fallback?
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}
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})
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} else {
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echarts.setCanvasCreator(() => canvas)
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}
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if (typeof callback === 'function') {
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this.chart = callback(canvas, canvasWidth, canvasHeight, canvasDpr)
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} else if (this.data.ec && typeof this.data.ec.onInit === 'function') {
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this.chart = this.data.ec.onInit(canvas, canvasWidth, canvasHeight, canvasDpr)
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} else {
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this.triggerEvent('init', {
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canvas: canvas,
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width: canvasWidth,
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height: canvasHeight,
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dpr: canvasDpr
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})
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}
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})
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},
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canvasToTempFilePath(opt) {
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if (this.data.isUseNewCanvas) {
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// 新版
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const query = wx.createSelectorQuery().in(this)
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query
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.select('.ec-canvas')
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.fields({ node: true, size: true })
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.exec(res => {
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const canvasNode = res[0].node
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opt.canvas = canvasNode
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wx.canvasToTempFilePath(opt)
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})
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} else {
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// 旧的
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if (!opt.canvasId) {
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opt.canvasId = this.data.canvasId;
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}
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ctx.draw(true, () => {
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wx.canvasToTempFilePath(opt, this);
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});
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}
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},
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touchStart(e) {
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if (this.chart && e.touches.length > 0) {
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var touch = e.touches[0];
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var handler = this.chart.getZr().handler;
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handler.dispatch('mousedown', {
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zrX: touch.x,
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zrY: touch.y,
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preventDefault: () => {},
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stopImmediatePropagation: () => {},
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stopPropagation: () => {}
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});
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handler.dispatch('mousemove', {
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zrX: touch.x,
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zrY: touch.y,
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preventDefault: () => {},
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stopImmediatePropagation: () => {},
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stopPropagation: () => {}
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});
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handler.processGesture(wrapTouch(e), 'start');
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}
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},
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touchMove(e) {
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if (this.chart && e.touches.length > 0) {
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var touch = e.touches[0];
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var handler = this.chart.getZr().handler;
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handler.dispatch('mousemove', {
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zrX: touch.x,
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zrY: touch.y,
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preventDefault: () => {},
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stopImmediatePropagation: () => {},
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stopPropagation: () => {}
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});
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handler.processGesture(wrapTouch(e), 'change');
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}
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},
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touchEnd(e) {
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if (this.chart) {
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const touch = e.changedTouches ? e.changedTouches[0] : {};
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var handler = this.chart.getZr().handler;
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handler.dispatch('mouseup', {
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zrX: touch.x,
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zrY: touch.y,
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preventDefault: () => {},
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stopImmediatePropagation: () => {},
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stopPropagation: () => {}
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});
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handler.dispatch('click', {
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zrX: touch.x,
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zrY: touch.y,
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preventDefault: () => {},
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stopImmediatePropagation: () => {},
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stopPropagation: () => {}
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});
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handler.processGesture(wrapTouch(e), 'end');
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}
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}
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}
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});
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function wrapTouch(event) {
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for (let i = 0; i < event.touches.length; ++i) {
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const touch = event.touches[i];
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touch.offsetX = touch.x;
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touch.offsetY = touch.y;
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}
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return event;
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}
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