echarts使用自定义图形实现3D柱状图

先看下效果吧

custom<a class= 3dBar" />

实现思路

使用graphic创建并注册自定义图形。根据每组的数据值，得到一个对应的点，从点出发用canvas绘制一组图形，分别为
顶部的菱形
top

const CubeTop = echarts.graphic.extendShape({buildPath: function (ctx, shape) {const c1 = [shape.x, shape.y]; // 下const c2 = [shape.x + 9, shape.y - 7]; // 右const c3 = [shape.x, shape.y - 12]; // 上const c4 = [shape.x - 9, shape.y - 7]; // 左ctx.moveTo(c1[0], c1[1]).lineTo(c2[0], c2[1]).lineTo(c3[0], c3[1]).lineTo(c4[0], c4[1]).closePath();}
});

左侧的四边形

const CubeLeft = echarts.graphic.extendShape({buildPath: function (ctx, shape) {const xAxisPoint = shape.xAxisPoint;const c0 = [shape.x, shape.y]; // 右上const c1 = [shape.x - 9, shape.y - 7]; //左上const c2 = [xAxisPoint[0] - 9, xAxisPoint[1] - 6]; // 左下const c3 = [xAxisPoint[0], xAxisPoint[1]]; // 右下ctx.moveTo(c0[0], c0[1]).lineTo(c1[0], c1[1]).lineTo(c2[0], c2[1]).lineTo(c3[0], c3[1]).closePath();}
});

右侧的四边形

const CubeRight = echarts.graphic.extendShape({buildPath: function (ctx, shape) {const xAxisPoint = shape.xAxisPoint;const c1 = [shape.x, shape.y]; // 左上const c2 = [xAxisPoint[0], xAxisPoint[1]]; // 左下const c3 = [xAxisPoint[0] + 9, xAxisPoint[1] - 7]; //右下const c4 = [shape.x + 9, shape.y - 7]; // 右上ctx.moveTo(c1[0], c1[1]).lineTo(c2[0], c2[1]).lineTo(c3[0], c3[1]).lineTo(c4[0], c4[1]).closePath();}
});

用series自定义系列(custom)的renderItem将这一组图形元素返回，组合形成3D柱状图

代码实现

<template><div id="graphicBar"></div>
</template><script setup>import {reactive, onMounted} from 'vue'import * as echarts from "echarts";const barData = reactive({xAxis: ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun'],data: [200, 180, 120, 220, 80, 160, 150]})const customShape = () => {// 创建自定义的shape类型const CubeLeft = echarts.graphic.extendShape({buildPath: function (ctx, shape) {const xAxisPoint = shape.xAxisPoint;const c0 = [shape.x, shape.y]; // 右上const c1 = [shape.x - 9, shape.y - 7]; //左上const c2 = [xAxisPoint[0] - 9, xAxisPoint[1] - 6]; // 左下const c3 = [xAxisPoint[0], xAxisPoint[1]]; // 右下ctx.moveTo(c0[0], c0[1]).lineTo(c1[0], c1[1]).lineTo(c2[0], c2[1]).lineTo(c3[0], c3[1]).closePath();}});const CubeRight = echarts.graphic.extendShape({buildPath: function (ctx, shape) {const xAxisPoint = shape.xAxisPoint;const c1 = [shape.x, shape.y]; // 左上const c2 = [xAxisPoint[0], xAxisPoint[1]]; // 左下const c3 = [xAxisPoint[0] + 9, xAxisPoint[1] - 7]; //右下const c4 = [shape.x + 9, shape.y - 7]; // 右上ctx.moveTo(c1[0], c1[1]).lineTo(c2[0], c2[1]).lineTo(c3[0], c3[1]).lineTo(c4[0], c4[1]).closePath();}});const CubeTop = echarts.graphic.extendShape({buildPath: function (ctx, shape) {const c1 = [shape.x, shape.y]; // 下const c2 = [shape.x + 9, shape.y - 7]; // 右const c3 = [shape.x, shape.y - 12]; // 上const c4 = [shape.x - 9, shape.y - 7]; // 左ctx.moveTo(c1[0], c1[1]).lineTo(c2[0], c2[1]).lineTo(c3[0], c3[1]).lineTo(c4[0], c4[1]).closePath();}});// 注册创建的自定义的shape类型echarts.graphic.registerShape('CubeLeft', CubeLeft);echarts.graphic.registerShape('CubeRight', CubeRight);echarts.graphic.registerShape('CubeTop', CubeTop);}const draw_bar = () => {customShape()const option = {xAxis: {data: barData.xAxis,axisLabel: {fontSize: 12,color: '#FFFFFF'},axisLine: {lineStyle: {color: '#3A4547',}},axisTick: {show: false}},yAxis: {type: 'value',axisLabel: {fontSize: 12,color: '#A8B5C1'},splitLine: {lineStyle: {color: ['#303638'],type: 'dashed'}}},grid: {containLabel: true,top: 10,bottom: 0,right: 0,left: 0},series: [        {type: 'custom',renderItem: (params, api) => {// coord 将数据值映射到坐标系上// api.value 给定维度的数据值const location = api.coord([api.value(0), api.value(1)]);return {type: 'group',children: [{type: 'CubeLeft',shape: {api,x: location[0], // 图形元素的右上角在父节点坐标系中的横坐标值y: location[1], // 图形元素的右上角在父节点坐标系中的纵坐标值xAxisPoint: api.coord([api.value(0), 0]) // 图形元素的右下角在父节点坐标系中的坐标值},style: {// 渐变色填充fill: new echarts.graphic.LinearGradient(0, 0, 0, 1, [{offset: 0,color: 'rgba(35, 153, 254, 1)'},{offset: 1,color: 'rgba(70, 207, 255, 1)'},])}},{type: 'CubeRight',shape: {api,x: location[0], // 中间上的xy: location[1], // 中间上的yxAxisPoint: api.coord([api.value(0), 0]) // 中间下},style: {fill: new echarts.graphic.LinearGradient(0, 0, 0, 1, [{offset: 0,color: 'rgba(32, 147, 255, 1)'},{offset: 1,color: 'rgba(71, 237, 255, 1)'},])}},{type: 'CubeTop',shape: {api,x: location[0],y: location[1],},style: {fill: new echarts.graphic.LinearGradient(0, 0, 0, 1, [{offset: 0,color: 'rgba(107, 230, 254, 1)'},{offset: 1,color: 'rgba(48, 211, 255, 1)'}])}}]};},data: barData.data}]};return option}const chart_init = () => {let curChart = echarts.init(document.getElementById('graphicBar'))const exampleOption = draw_bar()curChart.setOption(exampleOption);}onMounted(() => {chart_init()})
</script><style scoped>#graphicBar{width: 460px;height: 300px;}
</style>