环形进度条组件

<template>
  <div class="content" ref="box">
    <svg
      :id="idStr"
      style="transform: rotate(-90deg)"
      :width="width"
      :height="width"
      xmlns="http://www.w3.org/2000/svg"
    >
      <linearGradient :id="`gradient-${id}`" gradientUnits="userSpaceOnUse">
        <stop
          v-for="(item, index) in gradientsColor"
          :key="index"
          :offset="item.offset"
          :stop-color="item.color"
        />
      linearGradient>
      <circle
        :r="(width-radius)/2"
        :cy="width/2"
        :cx="width/2"
        :stroke-width="radius"
        :stroke="backgroundColor"
        fill="none"
      />
      <circle
        v-if="gradientsColorShow"
        ref="$bar"
        :r="(width-radius)/2"
        :cy="width/2"
        :cx="width/2"
        :stroke="gradientsColor ? `url(#gradient-${id})` : barColor"
        :stroke-width="radius"
        :stroke-linecap="isRound ? 'round' : 'square'"
        :stroke-dasharray="(width-radius)*3.14"
        :stroke-dashoffset="dashoffsetValue"
        fill="none"
      />
    svg>
    <div class="center_text">
      <p v-if="!$slots.default" class="title">{{progress}}%p>
      <slot>slot>
    div>
  div>
template>

<script>
// import _ from "lodash";
export default {
  props: {
    widthPresent: {
      type: Number,
      default: 1
    },
    gradientsColor: {
      type: [Boolean, Array],
      default: false
    },
    radius: {
      type: [Number, String],
      default: 20
    }, // 进度条厚度
    progress: {
      type: [Number, String],
      default: 20
    }, // 进度条百分比
    barColor: {
      type: String,
      default: "#1890ff"
    }, // 进度条颜色
    backgroundColor: {
      type: String,
      default: "rgba(0,0,0,0.3)"
    }, // 背景颜色
    isAnimation: {
      // 是否是动画效果
      type: Boolean,
      default: true
    },
    isRound: {
      // 是否是圆形画笔
      type: Boolean,
      default: true
    },
    id: {
      // 组件的id，多组件共存时使用
      type: [String, Number],
      default: 1
    },
    duration: {
      // 整个动画时长
      type: [String, Number],
      default: 1000
    },
    delay: {
      // 延迟多久执行
      type: [String, Number],
      default: 200
    },
    timeFunction: {
      // 动画缓动函数
      type: String,
      default: "cubic-bezier(0.99, 0.01, 0.22, 0.94)"
    }
  },
  data() {
    return {
      width: 200,
      idStr: "",
      oldValue: 0
    };
  },
  computed: {
    gradientsColorShow: function() {
      return true;
    },
    dashoffsetValue: function() {
      const { isAnimation, width, radius, progress, oldValue } = this;
      return isAnimation
        ? ((width - radius) * 3.14 * (100 - oldValue)) / 100
        : ((width - radius) * 3.14 * (100 - progress)) / 100;
    }
  },
  watch: {
    id: function() {
      this.idStr = `circle_progress_keyframes_${this.id || 1}`;
    },
    progress: function(newData, oldData) {
      if (newData !== oldData) {
        this.oldValue = oldData;
        this.setAnimation();
      }
    }
  },
  mounted() {
    this.idStr = `circle_progress_keyframes_${this.id || 1}`;
    let self = this;
    this.setCircleWidth();
    this.setAnimation();
    // 此处不能使用window.onresize
    window.addEventListener("resize", function() {
      self.setCircleWidth();
      self.setAnimation(self);
    });
  },
  methods: {
    setCircleWidth() {
      const { widthPresent } = this;
      this.$nextTick(() => {
        let box = this.$refs.box;
        let width = box.clientWidth * widthPresent;
        let height = box.clientHeight * widthPresent;
        let cW = width > height ? height : width;
        this.width = cW;
      })
    },
    setAnimation() {
      let self = this;
      if (self.isAnimation) {
        // 重复定义判断
        if (document.getElementById(self.idStr)) {
          self.$refs.$bar.classList.remove(`circle_progress_bar${self.id}`);
        }
        this.$nextTick(() => {
          this.startAnimation();
        });
      }
    },
    startAnimation() {
      // 生成动画样式文件
      let style = document.createElement("style");
      style.id = this.idStr;
      style.type = "text/css";
      style.innerHTML = `
      @keyframes circle_progress_keyframes_name_${this.id} {
      from {stroke-dashoffset: ${((this.width - this.radius) *
        3.14 *
        (100 - this.oldValue)) /
        100}px;}
      to {stroke-dashoffset: ${((this.width - this.radius) *
        3.14 *
        (100 - this.progress)) /
        100}px;}}
      .circle_progress_bar${
        this.id
      } {animation: circle_progress_keyframes_name_${this.id} ${
        this.duration
      }ms ${this.delay}ms ${this.timeFunction} forwards;}`;
      // 添加新样式文件
      document.getElementsByTagName("head")[0].appendChild(style);
      // 往svg元素中添加动画class
      this.$refs.$bar.classList.add(`circle_progress_bar${this.id}`);
    }
  }
};
script>
<style  scoped>
.content {
  height: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
}
.center_text {
  position: absolute;
  font-size: 16px;
  font-weight: bold;
}
style>
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