316 lines
8.9 KiB
Vue
316 lines
8.9 KiB
Vue
<template>
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<canvas type="2d" v-if="isUseNewCanvas" class="ec-canvas" :canvas-id="canvasId" @init="init" @touchstart="touchStart"
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@touchmove="touchMove" @touchend="touchEnd">
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</canvas>
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<canvas v-else class="ec-canvas" :canvas-id="canvasId" @init="init" @touchstart="touchStart" @touchmove="touchMove"
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@touchend="touchEnd">
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</canvas>
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</template>
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<script>
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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 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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export default {
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props: {
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canvasId: {
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type: String,
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default: () => {
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return "ec-canvas";
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}
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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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return {
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$curChart: {},
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toHandleList: [],
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isUseNewCanvas: true
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};
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},
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watch: {
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"ec.option": {
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deep: true,
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handler(val, oldVal) {
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this.setOption(val);
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}
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}
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},
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onReady: function() {
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if (!this.ec) {
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console.warn(
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'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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);
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return;
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}
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if (!this.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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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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init(callback) {
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const version = wx.getSystemInfoSync().SDKVersion;
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let canUseNewCanvas = this.compareVersion(version, "2.9.0") >= 0;
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if (this.forceUseOldCanvas) {
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if (canUseNewCanvas) console.warn("开发者强制使用旧canvas,建议关闭");
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canUseNewCanvas = false;
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}
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this.isUseNewCanvas = canUseNewCanvas && !this.forceUseOldCanvas;
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if (this.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 = this.compareVersion(version, "1.9.91") >= 0;
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if (!isValid) {
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console.error(
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"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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);
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return;
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} else {
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console.warn(
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"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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);
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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.canvasId, this);
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const canvas = new WxCanvas(ctx, this.canvasId, false);
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const that = this
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echarts.setCanvasCreator(() => {
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return 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
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.select(".ec-canvas")
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.boundingClientRect(res => {
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if (typeof callback === "function") {
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that.$curChart = callback(canvas, res.width, res.height, canvasDpr);
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} else if (that.ec) {
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that.initChart(canvas, res.width, res.height, canvasDpr)
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} else {
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that.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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devicePixelRatio: canvasDpr // 增加了dpr，可方便外面echarts.init
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});
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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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const that = this
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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({
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node: true,
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size: true
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})
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.exec(res => {
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const canvasNode = res[0].node;
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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, that.canvasId, true, canvasNode);
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echarts.setCanvasCreator(() => {
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return canvas;
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});
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if (typeof callback === "function") {
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that.$curChart = callback(
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canvas,
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canvasWidth,
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canvasHeight,
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canvasDpr
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);
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} else if (that.ec) {
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that.initChart(canvas, canvasWidth, canvasHeight, canvasDpr)
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} else {
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that.triggerEvent("init", {
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canvas: canvas,
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width: canvasWidth,
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height: canvasHeight,
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devicePixelRatio: canvasDpr
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});
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}
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});
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},
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setOption(val) {
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if (!this.$curChart || !this.$curChart.setOption) {
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this.toHandleList.push(val);
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} else {
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this.$curChart.setOption(val);
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}
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},
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canvasToTempFilePath(opt) {
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if (this.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({
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node: true,
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size: true
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})
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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.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.ec.stopTouchEvent) {
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e.preventDefault();
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e.stopPropagation();
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return;
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}
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this.$emit("touchstart", e);
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if (this.$curChart && e.touches.length > 0) {
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var touch = e.touches[0];
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var handler = this.$curChart.getZr().handler;
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if (handler) {
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handler.dispatch("mousedown", {
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zrX: touch.x,
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zrY: touch.y
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});
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handler.dispatch("mousemove", {
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zrX: touch.x,
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zrY: touch.y
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});
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handler.processGesture(wrapTouch(e), "start");
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}
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}
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},
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touchMove(e) {
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if (this.ec.stopTouchEvent) {
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e.preventDefault();
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e.stopPropagation();
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return;
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}
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this.$emit("touchmove", e);
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if (this.$curChart && e.touches.length > 0) {
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var touch = e.touches[0];
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var handler = this.$curChart.getZr().handler;
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if (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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});
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handler.processGesture(wrapTouch(e), "change");
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}
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}
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},
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touchEnd(e) {
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if (this.ec.stopTouchEvent) {
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e.preventDefault();
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e.stopPropagation();
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return;
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}
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this.$emit("touchend", e);
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if (this.$curChart) {
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const touch = e.changedTouches ? e.changedTouches[0] : {};
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var handler = this.$curChart.getZr().handler;
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if (handler) {
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handler.dispatch("mouseup", {
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zrX: touch.x,
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zrY: touch.y
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});
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handler.dispatch("click", {
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zrX: touch.x,
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zrY: touch.y
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});
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handler.processGesture(wrapTouch(e), "end");
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}
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}
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},
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initChart(canvas, width, height, canvasDpr) {
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this.$curChart = echarts.init(canvas, null, {
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width: width,
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height: height,
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devicePixelRatio: canvasDpr
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});
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canvas.setChart(this.$curChart);
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this.$curChart.setOption(this.ec.option);
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}
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}
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};
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</script>
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<style lang="scss">
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.ec-canvas {
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width: 100%;
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height: 100%;
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display: block;
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}
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</style>
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