黔西南大屏

packages/bigscreen/dv/components/DoughnutChart.vue

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+<template>
+  <div class="DoughnutChart-wrapper">
+    <div class="DoughnutChart" :id="id">
+      <canvas :id="canvasId"></canvas>
+      <div class="DonutChart-text">
+        <span>{{ ratio }}%</span>
+      </div>
+    </div>
+    <div class="DoughnutChart-explain">
+      <div class="item">
+        <i></i>
+        <span>已激活成员</span>
+        <p>2142</p>
+      </div>
+      <div class="item">
+        <i></i>
+        <span>未激活成员</span>
+        <p>2142</p>
+      </div>
+    </div>
+  </div>
+</template>
+
+<script>
+  export default {
+    props: ['ratio'],
+
+    data () {
+      return {
+        id: `DonutChart-${Math.ceil(Math.random() * 10000)}`,
+        canvasId: `DonutChartCanvas-${Math.ceil(Math.random() * 10000)}`,
+        canvasWidth: 90,
+        canvasHeight: 90
+      }
+    },
+
+    mounted () {
+      this.$nextTick(() => {
+        this.init()
+      })
+    },
+
+    methods: {
+      drawLine(ctx, options) {
+        const { beginX, beginY, endX, endY, lineColor, lineWidth } = options
+        ctx.lineWidth = lineWidth
+        ctx.strokeStyle = lineColor
+        ctx.beginPath()
+        ctx.moveTo(beginX, beginY)
+        ctx.lineTo(endX, endY)
+        ctx.closePath()
+        ctx.stroke()
+      },
+
+      angle (a, i, ox, oy, or) {
+        var hudu = (2 * Math.PI / 360) * a * i
+        var x = ox + Math.sin(hudu) * or
+        var y = oy - Math.cos(hudu) * or
+        return x + '_' + y
+      },
+
+      mapColor (value) {
+        if (value < 25) {
+          return '#FFC139'
+        }
+
+        if (value < 50) {
+          return '#21E03E'
+        }
+
+        return '#05C8FF'
+      },
+
+      init () {
+        const ctx = document.querySelector(`#${this.canvasId}`).getContext('2d')
+        const canvasWidth = document.querySelector(`#${this.id}`).offsetWidth
+        const canvasHeight = document.querySelector(`#${this.id}`).offsetHeight
+        const angle = this.ratio / 100 * 2
+        let radian = 0
+
+        ctx.width = canvasWidth
+        ctx.height = canvasHeight
+        const x = canvasWidth / 2
+        const y = canvasHeight / 2
+        ctx.lineWidth = 4
+        ctx.strokeStyle = 'rgba(102, 121, 138, 0.3)'
+        ctx.beginPath();
+        ctx.arc(x, y, x - 8, 0, 2 * Math.PI)
+        ctx.stroke()
+
+        ctx.beginPath()
+        ctx.lineWidth = 4
+        var g = ctx.createLinearGradient(0, 0, 0, 80)
+        g.addColorStop(0, 'rgba(44, 150, 231, 0.8)')
+        g.addColorStop(1, 'rgba(92, 255, 243, 1)')
+        ctx.strokeStyle = g
+
+        if (this.ratio < 25) {
+          radian = 3 / 2 + angle
+          ctx.arc(x, y, x - 8, Math.PI + Math.PI / 2, Math.PI * radian, false)
+        } else if (this.ratio === 100) {
+          ctx.arc(x, y, x - 8, 0, Math.PI * 2)
+        } else {
+          radian = (this.ratio - 25) / 100 * 2
+          ctx.arc(x, y, x - 8, Math.PI + Math.PI / 2, Math.PI * radian, false)
+        }
+        ctx.stroke()
+
+        ctx.beginPath()
+        ctx.strokeStyle = 'rgba(102, 121, 138, 0.4)'
+        ctx.lineWidth = 1
+        ctx.arc(x, y, x - 15, 0, 2 * Math.PI)
+        ctx.stroke()
+      }
+    }
+  }
+</script>
+
+<style lang="scss" scoped>
+  .DoughnutChart-wrapper {
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    height: 100%;
+    padding-top: 12px;
+
+    .DoughnutChart-explain {
+      flex: 1;
+      margin-left: 12px;
+
+      .item {
+        display: flex;
+        align-items: center;
+
+        i {
+          width: 8px;
+          height: 8px;
+          margin-right: 6px;
+          border-radius: 50%;
+          background: #5AF9F0;
+        }
+
+        span {
+          margin-right: 24px;
+          font-weight: 400;
+          font-size: 14px;
+          color: #9BB7D4;
+        }
+
+        p {
+          font-size: 14px;
+          color: #FFFFFF;
+        }
+
+        &:last-child i {
+          background: rgba(102, 121, 138, 0.3);
+        }
+      }
+    }
+
+
+    .DoughnutChart {
+      position: relative;
+      width: 90px;
+      height: 90px;
+      overflow: hidden;
+
+      .DonutChart-text {
+        display: flex;
+        position: absolute;
+        justify-content: center;
+        top: 50%;
+        left: 50%;
+        z-index: 1;
+        transform: translate(-50%, -50%);
+
+        span {
+          font-size: 18px;
+          font-weight: bold;
+          color: #02FEFF;
+        }
+      }
+    }
+  }
+</style>