今天小编给大家分享一下vue怎么使用echarts实现立体柱形图的相关知识点,内容详细,逻辑清晰,相信大部分人都还太了解这方面的知识,所以分享这篇文章给大家参考一下,希望大家阅读完这篇文章后有所收获,下面我们一起来了解一下吧。
立体柱形图是由前面、右面、上面三部分组成,绘制时需要先绘制前面为一个图形,右面和上面绘制为一个图形,然后在echats中注册,在option的series中renderItem中渲染
代码如下:
(1)注册绘制图形
registry () { let MyCubeRect = this.$echarts.graphic.extendShape({ shape: { x: 0, y: 0, width: 20, zWidth: 8, zHeight: 4 }, buildPath: function (ctx, shape) { const api = shape.api const xAxisPoint = api.coord([shape.xValue, 0]) const p0 = [shape.x, shape.y] const p1 = [shape.x - shape.width / 2, shape.y] const p4 = [shape.x + shape.width / 2, shape.y] const p2 = [shape.x - shape.width / 2, xAxisPoint[1]] const p3 = [shape.x + shape.width / 2, xAxisPoint[1]] ctx.moveTo(p0[0], p0[1]) ctx.lineTo(p1[0], p1[1]) ctx.lineTo(p2[0], p2[1]) ctx.lineTo(p3[0], p3[1]) ctx.lineTo(p4[0], p4[1]) ctx.lineTo(p0[0], p0[1]) ctx.closePath() } }) let MyCubeShadow = this.$echarts.graphic.extendShape({ shape: { x: 0, y: 0, width: 20, zWidth: 8, zHeight: 4 }, buildPath: function (ctx, shape) { const api = shape.api const xAxisPoint = api.coord([shape.xValue, 0]) const p1 = [shape.x - shape.width / 2, shape.y] const p4 = [shape.x + shape.width / 2, shape.y] const p6 = [shape.x + shape.width / 2 + shape.zWidth, shape.y - shape.zHeight] const p7 = [shape.x - shape.width / 2 + shape.zWidth, shape.y - shape.zHeight] const p3 = [shape.x + shape.width / 2, xAxisPoint[1]] const p5 = [shape.x + shape.width / 2 + shape.zWidth, xAxisPoint[1] - shape.zHeight] ctx.moveTo(p4[0], p4[1]) ctx.lineTo(p3[0], p3[1]) ctx.lineTo(p5[0], p5[1]) ctx.lineTo(p6[0], p6[1]) ctx.lineTo(p4[0], p4[1]) ctx.moveTo(p4[0], p4[1]) ctx.lineTo(p6[0], p6[1]) ctx.lineTo(p7[0], p7[1]) ctx.lineTo(p1[0], p1[1]) ctx.lineTo(p4[0], p4[1]) ctx.closePath() } }) this.$echarts.graphic.registerShape('MyCubeRect', MyCubeRect) this.$echarts.graphic.registerShape('MyCubeShadow', MyCubeShadow) }
(2)渲染图形
barChartOption: { tooltip: { trigger: 'axis', axisPointer: { type: 'cross', label: { backgroundColor: '#6a7985' } } }, grid: { containLabel: true, top: '30px', bottom: '0px', left: '0px' }, xAxis: { type: 'category', axisLabel: { interval: 0, fontSize: fontSize(12) }, axisLine: { show: false, lineStyle: { color: '#98b9c5' } }, data: [] //通过后端传入数据js传入 }, yAxis: { type: 'value', axisLabel: { fontSize: fontSize(12) }, axisLine: { show: false, lineStyle: { color: '#98b9c5' } }, splitLine: { lineStyle: { color: '#3a586a', type: 'dashed' } } }, series: [{ name: '单位面积能耗', type: 'custom', renderItem: (params, api) => { let location = api.coord([api.value(0), api.value(1)]) return { type: 'group', children: [{ type: 'MyCubeRect', shape: { api, xValue: api.value(0) - 0.5, yValue: api.value(1), x: location[0], y: location[1] }, style: api.style() }, { type: 'MyCubeShadow', shape: { api, xValue: api.value(0) - 0.5, yValue: api.value(1), x: location[0], y: location[1] }, style: { fill: api.style(), text: '' } }] } }, stack: '单位面积能耗', label: { show: true, position: 'top', formatter: '{c}', textStyle: { fontSize: fontSize(12), color: '#fff', align: 'center' } }, itemStyle: { color: new this.$echarts.graphic.LinearGradient( 0, 0, 0, 1, [ { offset: 0, color: '#b1950d' }, { offset: 0.5, color: '#aea20d' }, { offset: 1, color: '#a5aa12' } ] ) }, data: [] //后端传入数据 }] }
注意事项:
1)、在注册图形时style:只能使用 style: api.style();
text: ''后面才能使用label在图形顶部放置value
2)、this.$echarts是经过统一封装之后的,具体情况还需具体考虑
(3)生成图形
generateBarChart () { let vm = this if (this.$refs['uintEnergyConsume']) { //this.$refs是生成图形区域的ref值 this.$echarts.graphic.registerShape('MyCubeRect', this.MyCubeRect) this.$echarts.graphic.registerShape('MyCubeShadow', this.MyCubeShadow) this.barChart = this.$echarts.init(this.$refs['uintEnergyConsume']) this.barChart.setOption(this.barChartOption, false, true) $(window).resize(function () { //屏幕自适应 vm.handleResize() }) } }
(4)template中代码
<div ref="uintEnergyConsume" id="uintEnergyConsume" class="chart-container" element-loading-text="加载中..."></div></div>
(5)效果如下:
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