大屏

2022-07-21 18:19:41 +08:00
parent 2f05a88e56
commit c1131c0b54
4 changed files with 223 additions and 4 deletions
--- a/project/dv/apps/components/DonutChart.vue
+++ b/project/dv/apps/components/DonutChart.vue
@@ -0,0 +1,133 @@
+<template>
+  <div class="DonutChart" :id="id">
+    <canvas :id="canvasId"></canvas>
+    <div class="DonutChart-text">
+      <span>{{ ratio }}%</span>
+      <i>{{ text }}</i>
+    </div>
+  </div>
+</template>
+
+<script>
+  export default {
+    props: ['ratio', 'text'],
+
+    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 = 2
+        ctx.strokeStyle = '#383f56'
+        ctx.beginPath();
+        ctx.arc(x, y, x - 3, 0, 2 * Math.PI)
+        ctx.stroke()
+
+        ctx.beginPath()
+        ctx.lineWidth = 4
+        ctx.strokeStyle = 'rgba(76, 202, 227, 1)'
+
+        if (this.ratio < 25) {
+          radian = 3 / 2 + angle
+          ctx.arc(x, y, x - 4, Math.PI + Math.PI / 2, Math.PI * radian, false)
+        } else if (this.ratio === 100) {
+          ctx.arc(x, y, x - 4, 0, Math.PI * 2)
+        } else {
+          radian = (this.ratio - 25) / 100 * 2
+          ctx.arc(x, y, x - 4, Math.PI + Math.PI / 2, Math.PI * radian, false)
+        }
+        ctx.stroke()
+      }
+    }
+  }
+</script>
+
+<style lang="scss" scoped>
+  .DonutChart {
+    position: relative;
+    width: 84px;
+    height: 84px;
+    overflow: hidden;
+
+    .DonutChart-text {
+      display: flex;
+      position: absolute;
+      align-items: center;
+      justify-content: center;
+      flex-direction: column;
+      top: 50%;
+      left: 50%;
+      z-index: 1;
+      width: 100%;
+      height: 100%;
+      line-height: 1;
+      transform: translate(-50%, -50%);
+
+      span {
+        margin-bottom: 8px;
+        font-size: 20px;
+        font-weight: bold;
+        color: #fff;
+        font-style: oblique;
+      }
+
+      i {
+        font-size: 12px;
+        font-style: normal;
+        color: rgba(42, 183, 209, 1);
+      }
+    }
+  }
+</style>