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+<template>
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+ <!-- 新的:接口对其了H5 -->
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+ <canvas
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+ v-if="isUseNewCanvas"
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+ type="2d"
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+ class="ec-canvas"
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+ :canvas-id="canvasId"
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+ :id="canvasId"
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+ @init="init"
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+ @touchstart="ec.disableTouch ? '' : touchStart"
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+ @touchmove="ec.disableTouch ? '' : touchMove"
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+ @touchend="ec.disableTouch ? '' : touchEnd"
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+ ></canvas>
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+ <!-- 旧的 -->
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+ <canvas
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+ v-else
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+ class="ec-canvas"
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+ :canvas-id="canvasId"
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+ :id="canvasId"
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+ @init="init"
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+ @touchstart="ec.disableTouch ? '' : touchStart"
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+ @touchmove="ec.disableTouch ? '' : touchMove"
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+ @touchend="ec.disableTouch ? '' : touchEnd"
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+ ></canvas>
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+</template>
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+
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+<script>
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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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+
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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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+
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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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+
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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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+import WxCanvas from "./wx-canvas";
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+import * as echarts from "./echarts";
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+console.log(echarts, "....");
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+let ctx;
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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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+ value: "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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+ default: {},
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+ },
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+ initChart: {
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+ type: Function,
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+ default: () => {},
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+ },
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+
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+ forceUseOldCanvas: {
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+ type: Boolean,
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+ default: false,
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+ },
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+ },
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+ mounted() {
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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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+ } 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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+
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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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+
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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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+ data() {
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+ return {
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+ isUseNewCanvas: true,
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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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+
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+ const canUseNewCanvas = compareVersion(version, "2.9.0") >= 0;
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+ const forceUseOldCanvas = this.forceUseOldCanvas;
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+ const isUseNewCanvas = canUseNewCanvas && !forceUseOldCanvas;
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+ // this.setData({ isUseNewCanvas });
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+ this.isUseNewCanvas = isUseNewCanvas;
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+
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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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+
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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(
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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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+
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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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+
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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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+ this.chart = callback(canvas, res.width, res.height, canvasDpr);
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+ } else if (this.ec && typeof this.ec.onInit === "function") {
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+ this.chart = this.ec.onInit(
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+ canvas,
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+ res.width,
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+ res.height,
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+ canvasDpr
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+ );
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+ } else {
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+ this.$emit("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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+ })
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+ .exec();
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+ },
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+
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+ initByNewWay(callback) {
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+ let that = this;
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+ console.log(that);
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+ // version >= 2.9.0:使用新的方式初始化
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+ const query = uni.createSelectorQuery().in(this);
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+
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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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+ console.log(res);
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+ this.canvasNode = canvasNode;
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+
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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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+
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+ const ctx = canvasNode.getContext("2d");
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+
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+ const canvas = new WxCanvas(ctx, this.canvasId, true, canvasNode);
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+ echarts.setCanvasCreator(() => {
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+ return canvas;
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+ });
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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.ec && typeof this.initChart === "function") {
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+ console.log(that)
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+ this.chart = that.initChart(
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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 {
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+ console.log("执行到init", this.ec);
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+ this.$emit("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.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.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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+
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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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+
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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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+
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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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+</script>
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+
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+<style lang="less" scoped>
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+.ec-canvas {
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+ width: 100%;
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+ height: 100%;
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+}
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+</style>
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