Initial commit

ecCanvas/components/ec-canvas/ec-canvas.js

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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;
+}

ecCanvas/components/ec-canvas/ec-canvas.json

@@ -0,0 +1,4 @@
+{
+  "component": true,
+  "usingComponents": {}
+}

ecCanvas/components/ec-canvas/ec-canvas.wxml

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+<!-- 新的：接口对其了H5 -->
+<canvas wx:if="{{isUseNewCanvas}}" type="2d" class="ec-canvas" canvas-id="{{ canvasId }}" bindinit="init" bindtouchstart="{{ ec.disableTouch ? '' : 'touchStart' }}" bindtouchmove="{{ ec.disableTouch ? '' : 'touchMove' }}" bindtouchend="{{ ec.disableTouch ? '' : 'touchEnd' }}"></canvas>
+<!-- 旧的 -->
+<canvas wx:else class="ec-canvas" canvas-id="{{ canvasId }}" bindinit="init" bindtouchstart="{{ ec.disableTouch ? '' : 'touchStart' }}" bindtouchmove="{{ ec.disableTouch ? '' : 'touchMove' }}" bindtouchend="{{ ec.disableTouch ? '' : 'touchEnd' }}"></canvas>

ecCanvas/components/ec-canvas/ec-canvas.wxss

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+.ec-canvas {
+  width: 100%;
+  height: 100%;
+}

ecCanvas/components/ec-canvas/wx-canvas.js

@@ -0,0 +1,121 @@
+export default class WxCanvas {
+  constructor(ctx, canvasId, isNew, canvasNode) {
+    this.ctx = ctx;
+    this.canvasId = canvasId;
+    this.chart = null;
+    this.isNew = isNew
+    if (isNew) {
+      this.canvasNode = canvasNode;
+    }
+    else {
+      this._initStyle(ctx);
+    }
+
+    // this._initCanvas(zrender, ctx);
+
+    this._initEvent();
+  }
+
+  getContext(contextType) {
+    if (contextType === '2d') {
+      return this.ctx;
+    }
+  }
+
+  // canvasToTempFilePath(opt) {
+  //   if (!opt.canvasId) {
+  //     opt.canvasId = this.canvasId;
+  //   }
+  //   return wx.canvasToTempFilePath(opt, this);
+  // }
+
+  setChart(chart) {
+    this.chart = chart;
+  }
+
+  attachEvent() {
+    // noop
+  }
+
+  detachEvent() {
+    // noop
+  }
+
+  _initCanvas(zrender, ctx) {
+    zrender.util.getContext = function () {
+      return ctx;
+    };
+
+    zrender.util.$override('measureText', function (text, font) {
+      ctx.font = font || '12px sans-serif';
+      return ctx.measureText(text);
+    });
+  }
+
+  _initStyle(ctx) {
+    var styles = ['fillStyle', 'strokeStyle', 'globalAlpha',
+      'textAlign', 'textBaseAlign', 'shadow', 'lineWidth',
+      'lineCap', 'lineJoin', 'lineDash', 'miterLimit', 'fontSize'];
+
+    styles.forEach(style => {
+      Object.defineProperty(ctx, style, {
+        set: value => {
+          if (style !== 'fillStyle' && style !== 'strokeStyle'
+            || value !== 'none' && value !== null
+          ) {
+            ctx['set' + style.charAt(0).toUpperCase() + style.slice(1)](value);
+          }
+        }
+      });
+    });
+
+    ctx.createRadialGradient = () => {
+      return ctx.createCircularGradient(arguments);
+    };
+  }
+
+  _initEvent() {
+    this.event = {};
+    const eventNames = [{
+      wxName: 'touchStart',
+      ecName: 'mousedown'
+    }, {
+      wxName: 'touchMove',
+      ecName: 'mousemove'
+    }, {
+      wxName: 'touchEnd',
+      ecName: 'mouseup'
+    }, {
+      wxName: 'touchEnd',
+      ecName: 'click'
+    }];
+
+    eventNames.forEach(name => {
+      this.event[name.wxName] = e => {
+        const touch = e.touches[0];
+        this.chart.getZr().handler.dispatch(name.ecName, {
+          zrX: name.wxName === 'tap' ? touch.clientX : touch.x,
+          zrY: name.wxName === 'tap' ? touch.clientY : touch.y
+        });
+      };
+    });
+  }
+
+  set width(w) {
+    if (this.canvasNode) this.canvasNode.width = w
+  }
+  set height(h) {
+    if (this.canvasNode) this.canvasNode.height = h
+  }
+
+  get width() {
+    if (this.canvasNode)
+      return this.canvasNode.width
+    return 0
+  }
+  get height() {
+    if (this.canvasNode)
+      return this.canvasNode.height
+    return 0
+  }
+}

ecCanvas/pages/index/index.js

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+import * as echarts from '../../../ecCanvas/components/ec-canvas/echarts';
+
+function initChart(canvas, width, height, dpr) {
+  const chart = echarts.init(canvas, null, {
+    width: width,
+    height: height,
+    devicePixelRatio: dpr // new
+  });
+  canvas.setChart(chart);
+
+  var option = {
+    title: {
+      text: '测试下面legend的红色区域不应被裁剪',
+      left: 'center'
+    },
+    legend: {
+      data: ['A', 'B', 'C'],
+      top: 50,
+      left: 'center',
+      backgroundColor: 'red',
+      z: 100
+    },
+    grid: {
+      containLabel: true
+    },
+    tooltip: {
+      show: true,
+      trigger: 'axis'
+    },
+    xAxis: {
+      type: 'category',
+      boundaryGap: false,
+      data: ['周一', '周二', '周三', '周四', '周五', '周六', '周日'],
+      // show: false
+    },
+    yAxis: {
+      x: 'center',
+      type: 'value',
+      splitLine: {
+        lineStyle: {
+          type: 'dashed'
+        }
+      }
+      // show: false
+    },
+    series: [{
+      name: 'A',
+      type: 'line',
+      smooth: true,
+      data: [18, 36, 65, 30, 78, 40, 33]
+    }, {
+      name: 'B',
+      type: 'line',
+      smooth: true,
+      data: [12, 50, 51, 35, 70, 30, 20]
+    }, {
+      name: 'C',
+      type: 'line',
+      smooth: true,
+      data: [10, 30, 31, 50, 40, 20, 10]
+    }]
+  };
+
+  chart.setOption(option);
+  return chart;
+}
+
+Page({
+  
+  data: {
+    ec: {
+      onInit: initChart
+    }
+  },
+});

ecCanvas/pages/index/index.json

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+{
+  "usingComponents": {
+    "ec-canvas": "../../../ecCanvas/components/ec-canvas/ec-canvas"
+  }
+}

ecCanvas/pages/index/index.wxml

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+<!--index.wxml-->
+分包
+<view class="echarts-con">
+  <ec-canvas id="mychart-dom-line" canvas-id="mychart-line" ec="{{ ec }}"></ec-canvas>
+</view>

ecCanvas/pages/index/index.wxss

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+.echarts-con {
+  position: absolute;
+  top: 0;
+  bottom: 0;
+  left: 0;
+  right: 0;
+
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  justify-content: space-between;
+  box-sizing: border-box;
+} 
+ec-canvas {
+  width: 100%;
+  height: 100%;
+}