<template><div :id="id" :class="className" :style="{ height: height, width: width }" /></template>

<script>
import tdTheme from "./theme.json"; // 引入默认主题
export default {
  name: "echart",
  props: {
    className: {
      type: String,
      default: "chart",
    },
    id: {
      type: String,
      default: "chart",
    },
    width: {
      type: String,
      default: "100%",
    },
    height: {
      type: String,
      default: "2.5rem",
    },
    options: {
      type: Object,
      default: () => ({}),
    },
  },
  data () {
    return {
      chart: null,
    };
  },
  watch: {
    options: {
      handler (options) {
        // 设置true清空echart缓存
        this.chart.setOption(options, true);
        window.addEventListener("resize", () => {
          if (this.chart) {
            this.chart.resize();
          }
        });
      },
      deep: true,
    },
  },
  mounted () {
    this.$echarts.registerTheme("tdTheme", tdTheme); // 覆盖默认主题
    this.initChart();
  },
  beforeDestroy () {
    this.chart.dispose();
    this.chart = null;
  },
  methods: {
    initChart () {
      // 初始化echart
      this.chart = this.$echarts.init(this.$el, "tdTheme");
      function nowSize (val, initWidth = 1920) {
        return val * (nowClientWidth / initWidth);
      }
      this.chart.setOption(this.options, true);
    },
  },
};
</script>