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