g-cesium-map/public/map/components/charts/PieChart.vue

<template>
  <div ref="chartContainer" class="pie-chart-container"></div>
</template>

<script setup lang="ts">
import { ref, onMounted, onBeforeUnmount, watch } from 'vue'
import * as echarts from 'echarts'

// 定义组件props
interface Props {
  chartData?: Array<{ name: string; value: number }>
  title?: string
}

const props = withDefaults(defineProps<Props>(), {
  chartData: () => [],
  title: ''
})

const chartContainer = ref<HTMLDivElement | null>(null)
let chartInstance: echarts.ECharts | null = null

// 初始化图表
const initChart = () => {
  if (chartContainer.value) {
    chartInstance = echarts.init(chartContainer.value)
    updateChart()
  }
}

// 计算数据总和
const getTotalValue = () => {
  if (!props.chartData) return 0
  const total = props.chartData.reduce((sum, item) => sum + item.value, 0)
  return Math.round(total * 100) / 100 // 保留两位小数
}

// 更新图表
const updateChart = () => {
  if (!chartInstance || !props.chartData) return

  const totalValue = getTotalValue()

  const option = {
    title: {
      // text: props.title,
      left: 'center',
      textStyle: {
        color: '#FFF'
      }
    },
    tooltip: {
      trigger: 'item'
    },
    legend: {
      show: true,
      // type: 'scroll',       // 👈 开启可滚动图例
      orient: 'horizontal', // 👈 水平排列
      top: 10,              // 👈 放在顶部
      left: 'center',       // 👈 居中对齐
      textStyle: {
        color: '#FFF'
      }
    },
    series: [
      {
        name: props.title,
        type: 'pie',
        radius: ['35%', '55%'], // 调整内外半径，增加厚度
        center: ['50%', '40%'], // 👈 调整饼图位置，因为图例已移到顶部
        padAngle: 5, // 添加间隙角度
        avoidLabelOverlap: true,
        itemStyle: {
          borderRadius: 0,
          borderColor: 'transparent', // 取消边框
          borderWidth: 0 // 边框宽度设为0
        },
        label: {
          show: true,
          formatter: (params) => {
            return params.name + '\n' + params.value.toFixed(2)
          },
          fontSize: 16,
          color: '#FFFFFF', // 设置文本颜色为白色
          textBorderColor: 'transparent', // 取消文本边缘的发光效果
          textBorderWidth: 0
        },
        emphasis: {
          label: {
            show: true,
            formatter: (params) => {
              return params.name + '\n' + params.value.toFixed(2)
            },
            fontSize: 14,
            fontWeight: 'bold',
            color: '#FFFFFF', // 设置强调时文本颜色为白色
            textBorderColor: 'transparent', // 取消文本边缘的发光效果
            textBorderWidth: 0
          }
        },
        labelLine: {
          show: true
        },
        data: props.chartData
      },
      {
        name: '总量',
        type: 'pie',
        radius: ['0%', '35%'], // 内部圆环用于显示总数，与外环内半径匹配
        center: ['50%', '40%'],
        hoverAnimation: false, // 禁用悬停动画
        label: {
          show: true,
          position: 'center',
          formatter: [`{title|总数}`, `{value|${totalValue.toFixed(2)}}`].join('\n'),
          rich: {
            title: {
              color: '#FFF',
              fontSize: 14,
              lineHeight: 20
            },
            value: {
              color: '#FFF',
              fontSize: 20,
              fontWeight: 'bold',
              lineHeight: 30
            }
          }
        },
        labelLine: {
          show: false
        },
        data: [
          {
            value: totalValue,
            itemStyle: {
              color: 'rgba(0, 0, 0, 0)' // 透明色
            }
          }
        ]
      }
    ]
  }

  chartInstance.setOption(option, true)
}

// 窗口大小改变时重置图表大小
const handleResize = () => {
  if (chartInstance) {
    chartInstance.resize()
  }
}

// 监听数据变化
watch(
  () => props.chartData,
  () => {
    updateChart()
  },
  { deep: true }
)

// 初始化和销毁
onMounted(() => {
  initChart()
  window.addEventListener('resize', handleResize)
})

onBeforeUnmount(() => {
  if (chartInstance) {
    chartInstance.dispose()
  }
  window.removeEventListener('resize', handleResize)
})
</script>

<style scoped>
.pie-chart-container {
  width: 100%;
  height: 100%;
}
</style>