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

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

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

// 定义组件属性
interface Props {
  chartData?: Array<{
    name: string
    currentValue: number
    previousValue: number
  }>
  title?: string
  currentColor?: string
  previousColor?: string
  showYAxis?: boolean
  yAxisName?: string
}

const props = withDefaults(defineProps<Props>(), {
  chartData: () => [],
  title: '',
  currentColor: '#1296db',
  previousColor: '#ff6b6b',
  showYAxis: true,
  yAxisName: '数值'
})

// 图表容器引用和实例
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()
  }
}

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

  const option = {
    title: {
      text: props.title,
      textStyle: {
        color: '#fff',
        fontSize: 14
      },
      left: 'center'
    },
    tooltip: {
      trigger: 'axis',
      axisPointer: {
        type: 'shadow'
      },
      backgroundColor: 'rgba(0, 0, 0, 0.7)',
      borderColor: 'rgba(30, 120, 255, 0.4)',
      borderWidth: 1,
      textStyle: {
        color: '#fff'
      },
      formatter: function (params: any) {
        const currentData = params[0]
        const previousData = params[1]

        const growthRate = previousData.value > 0
          ? ((currentData.value - previousData.value) / previousData.value * 100).toFixed(2)
          : '∞'

        return `${currentData.name}<br/>
                ${currentData.seriesName}: ${currentData.value}<br/>
                ${previousData.seriesName}: ${previousData.value}<br/>
                增长率: ${growthRate}%`
      }
    },
    legend: {
      data: ['本期', '上期'],
      textStyle: {
        color: '#fff'
      },
      top: 30
    },
    grid: {
      left: '3%',
      right: '4%',
      bottom: '3%',
      top: '25%',
      containLabel: true
    },
    xAxis: {
      type: 'category',
      data: props.chartData.map(item => item.name),
      axisLine: {
        lineStyle: {
          color: 'rgba(255, 255, 255, 0.3)'
        }
      },
      axisLabel: {
        color: 'rgba(255, 255, 255, 0.7)',
        rotate: 0,
        interval: 0,
        margin: 15
      }
    },
    yAxis: {
      type: 'value',
      show: props.showYAxis,
      name: props.yAxisName,
      nameTextStyle: {
        color: 'rgba(255, 255, 255, 0.7)'
      },
      axisLine: {
        show: props.showYAxis,
        lineStyle: {
          color: 'rgba(255, 255, 255, 0.3)'
        }
      },
      splitLine: {
        show: props.showYAxis,
        lineStyle: {
          color: 'rgba(255, 255, 255, 0.1)'
        }
      },
      axisLabel: {
        show: props.showYAxis,
        color: 'rgba(255, 255, 255, 0.7)'
      }
    },
    series: [
      {
        name: '当前期',
        type: 'bar',
        data: props.chartData.map(item => item.currentValue),
        barWidth: '35%',
        itemStyle: {
          color: {
            type: 'linear',
            x: 0,
            y: 0,
            x2: 0,
            y2: 1,
            colorStops: [
              {
                offset: 0,
                color: props.currentColor
              },
              {
                offset: 1,
                color: props.currentColor + '80'
              }
            ]
          },
          borderRadius: [4, 4, 0, 0]
        },
        emphasis: {
          itemStyle: {
            color: props.currentColor
          }
        },
        label: {
          show: true,
          position: 'top',
          color: '#fff',
          formatter: '{c}',
          fontSize: 12
        }
      },
      {
        name: '对比期',
        type: 'bar',
        data: props.chartData.map(item => item.previousValue),
        barWidth: '35%',
        itemStyle: {
          color: {
            type: 'linear',
            x: 0,
            y: 0,
            x2: 0,
            y2: 1,
            colorStops: [
              {
                offset: 0,
                color: props.previousColor
              },
              {
                offset: 1,
                color: props.previousColor + '80'
              }
            ]
          },
          borderRadius: [4, 4, 0, 0]
        },
        emphasis: {
          itemStyle: {
            color: props.previousColor
          }
        },
        label: {
          show: true,
          position: 'top',
          color: '#fff',
          formatter: '{c}',
          fontSize: 12
        }
      }
    ]
  }

  chartInstance.setOption(option)
}

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

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

// 组件挂载时初始化图表
onMounted(() => {
  initChart()

  window.addEventListener('resize', handleResize)
})

// 组件销毁前清理资源
onBeforeUnmount(() => {
  window.removeEventListener('resize', handleResize)
  if (chartInstance) {
    chartInstance.dispose()
    chartInstance = null
  }
})
</script>

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