signed

QiShunwang

“诚信为本、客户至上”

3D饼/环Echarts图的实现

2021/1/28 14:53:27   来源:

首先确保在项目中引入了echarts和echarts-gl
"echarts": "^4.9.0",
"echarts-gl": "^1.1.2"

剩下的配置好optionData的数据,交给代码

<template>
	<div class="water-eval-container">
		<div class="cityGreenLand-charts" id="cityGreenLand-charts">
		</div>
	</div>
</template>

<script>
	import echarts from 'echarts'
	import 'echarts-gl';
	export default {
		name: "cityGreenLand",
		components: {},
		data() {
			return {
				optionData: [{
					name: '林地面积统计',
					value: 10000,
					itemStyle: {
						color: '#22c4ff',
					}
				}, {
					name: '草地面积统计',
					value: 12116,
					itemStyle: {
						color: '#aaff00'
					}
				}, {
					name: '耕地地面积统计',
					value: 16616,
					itemStyle: {
						color: '#ffaaff'
					}
				}],
			}
		},
		mounted() {
			this.$nextTick(function() {
				this.init();
			});
		},
		methods: {
			init() {
				//构建3d饼状图
				let myChart = echarts.init(document.getElementById('cityGreenLand-charts'));
				// 传入数据生成 option
				this.option = this.getPie3D(this.optionData, 0.8);
				myChart.setOption(this.option);
				//是否需要label指引线,如果要就添加一个透明的2d饼状图并调整角度使得labelLine和3d的饼状图对齐,并再次setOption
				this.option.series.push({
					name: 'pie2d',
					type: 'pie',
					labelLine:{
						length:10,
						length2:10
					},
					startAngle: -20 , //起始角度,支持范围[0, 360]。
					clockwise: false,//饼图的扇区是否是顺时针排布。上述这两项配置主要是为了对齐3d的样式
					radius: ['20%', '50%'],
					center: ['50%', '50%'],
					data: this.optionData,
					itemStyle:{
						opacity:0
					}
				});
				myChart.setOption(this.option);
				this.bindListen(myChart);
			},

			getPie3D(pieData, internalDiameterRatio) {
				//internalDiameterRatio:透明的空心占比
				let that = this;
				let series = [];
				let sumValue = 0;
				let startValue = 0;
				let endValue = 0;
				let legendData = [];
				let legendBfb = [];
				let k = 1 - internalDiameterRatio;
				pieData.sort((a, b) => {
					return (b.value - a.value);
				});
				// 为每一个饼图数据,生成一个 series-surface 配置
				for (let i = 0; i < pieData.length; i++) {
					sumValue += pieData[i].value;
					let seriesItem = {
						name: typeof pieData[i].name === 'undefined' ? `series${i}` : pieData[i].name,
						type: 'surface',
						parametric: true,
						wireframe: {
							show: false
						},
						pieData: pieData[i],
						pieStatus: {
							selected: false,
							hovered: false,
							k: k
						},
						center: ['10%', '50%']
					};

					if (typeof pieData[i].itemStyle != 'undefined') {
						let itemStyle = {};
						typeof pieData[i].itemStyle.color != 'undefined' ? itemStyle.color = pieData[i].itemStyle.color : null;
						typeof pieData[i].itemStyle.opacity != 'undefined' ? itemStyle.opacity = pieData[i].itemStyle.opacity : null;
						seriesItem.itemStyle = itemStyle;
					}
					series.push(seriesItem);
				}

				// 使用上一次遍历时,计算出的数据和 sumValue,调用 getParametricEquation 函数,
				// 向每个 series-surface 传入不同的参数方程 series-surface.parametricEquation,也就是实现每一个扇形。
				legendData = [];
				legendBfb = [];
				for (let i = 0; i < series.length; i++) {
					endValue = startValue + series[i].pieData.value;
					series[i].pieData.startRatio = startValue / sumValue;
					series[i].pieData.endRatio = endValue / sumValue;
					series[i].parametricEquation = this.getParametricEquation(series[i].pieData.startRatio, series[i].pieData.endRatio,
						false, false, k, series[i].pieData.value);
					startValue = endValue;
					let bfb = that.fomatFloat(series[i].pieData.value / sumValue, 4);
					legendData.push({
						name: series[i].name,
						value: bfb
					});
					legendBfb.push({
						name: series[i].name,
						value: bfb
					});
				}
				let boxHeight = this.getHeight3D(series, 26);//通过传参设定3d饼/环的高度,26代表26px
				// 准备待返回的配置项,把准备好的 legendData、series 传入。
				let option = {
					legend: {
						data: legendData,
						orient: 'horizontal',
						left: 10,
						top: 10,
						itemGap: 10,
						textStyle: {
							color: '#A1E2FF',
						},
						show: true,
						icon: "circle",
						formatter: function(param) {
							let item = legendBfb.filter(item => item.name == param)[0];
							let bfs = that.fomatFloat(item.value * 100, 2) + "%";
							return `${item.name}  ${bfs}`;
						}
					},
					labelLine: {
						show: true,
						lineStyle: {
							color: '#7BC0CB'
						}
					},
					label: {
						show: true,
						position: 'outside',
						rich: {
							b: {
								color: '#7BC0CB',
								fontSize: 12,
								lineHeight: 20
							},
							c: {
								fontSize: 16,
							},
						},
						formatter: '{b|{b} \n}{c|{c}}{b|  亩}',

					},
					tooltip: {
						formatter: params => {
							if (params.seriesName !== 'mouseoutSeries' && params.seriesName !== 'pie2d') {
								let bfb = ((option.series[params.seriesIndex].pieData.endRatio - option.series[params.seriesIndex].pieData.startRatio) *
									100).toFixed(2);
								return `${params.seriesName}<br/>` +
									`<span style="display:inline-block;margin-right:5px;border-radius:10px;width:10px;height:10px;background-color:${params.color};"></span>` +
									`${ bfb }%`;
							}
						}
					},
					xAxis3D: {
						min: -1,
						max: 1
					},
					yAxis3D: {
						min: -1,
						max: 1
					},
					zAxis3D: {
						min: -1,
						max: 1
					},
					grid3D: {
						show: false,
						boxHeight: boxHeight, //圆环的高度
						viewControl: { //3d效果可以放大、旋转等,请自己去查看官方配置
							alpha: 40, //角度
							distance: 300,//调整视角到主体的距离,类似调整zoom
							rotateSensitivity: 0, //设置为0无法旋转
							zoomSensitivity: 0, //设置为0无法缩放
							panSensitivity: 0, //设置为0无法平移
							autoRotate: false //自动旋转
						}
					},
					series: series
				};
				return option;
			},

			//获取3d丙图的最高扇区的高度
			getHeight3D(series, height) {
				series.sort((a, b) => {
					return (b.pieData.value - a.pieData.value);
				})
				return height * 25 / series[0].pieData.value;
			},

			// 生成扇形的曲面参数方程,用于 series-surface.parametricEquation
			getParametricEquation(startRatio, endRatio, isSelected, isHovered, k, h) {
				// 计算
				let midRatio = (startRatio + endRatio) / 2;
				let startRadian = startRatio * Math.PI * 2;
				let endRadian = endRatio * Math.PI * 2;
				let midRadian = midRatio * Math.PI * 2;
				// 如果只有一个扇形,则不实现选中效果。
				if (startRatio === 0 && endRatio === 1) {
					isSelected = false;
				}
				// 通过扇形内径/外径的值,换算出辅助参数 k(默认值 1/3)
				k = typeof k !== 'undefined' ? k : 1 / 3;
				// 计算选中效果分别在 x 轴、y 轴方向上的位移(未选中,则位移均为 0)
				let offsetX = isSelected ? Math.cos(midRadian) * 0.1 : 0;
				let offsetY = isSelected ? Math.sin(midRadian) * 0.1 : 0;
				// 计算高亮效果的放大比例(未高亮,则比例为 1)
				let hoverRate = isHovered ? 1.05 : 1;
				// 返回曲面参数方程
				return {
					u: {
						min: -Math.PI,
						max: Math.PI * 3,
						step: Math.PI / 32
					},
					v: {
						min: 0,
						max: Math.PI * 2,
						step: Math.PI / 20
					},
					x: function(u, v) {
						if (u < startRadian) {
							return offsetX + Math.cos(startRadian) * (1 + Math.cos(v) * k) * hoverRate;
						}
						if (u > endRadian) {
							return offsetX + Math.cos(endRadian) * (1 + Math.cos(v) * k) * hoverRate;
						}
						return offsetX + Math.cos(u) * (1 + Math.cos(v) * k) * hoverRate;
					},
					y: function(u, v) {
						if (u < startRadian) {
							return offsetY + Math.sin(startRadian) * (1 + Math.cos(v) * k) * hoverRate;
						}
						if (u > endRadian) {
							return offsetY + Math.sin(endRadian) * (1 + Math.cos(v) * k) * hoverRate;
						}
						return offsetY + Math.sin(u) * (1 + Math.cos(v) * k) * hoverRate;
					},
					z: function(u, v) {
						if (u < -Math.PI * 0.5) {
							return Math.sin(u);
						}
						if (u > Math.PI * 2.5) {
							return Math.sin(u) * h * .1;
						}
						return Math.sin(v) > 0 ? 1 * h * .1 : -1;
					}
				};
			},

			fomatFloat(num, n) {
				var f = parseFloat(num);
				if (isNaN(f)) {
					return false;
				}
				f = Math.round(num * Math.pow(10, n)) / Math.pow(10, n); // n 幂   
				var s = f.toString();
				var rs = s.indexOf('.');
				//判定如果是整数,增加小数点再补0
				if (rs < 0) {
					rs = s.length;
					s += '.';
				}
				while (s.length <= rs + n) {
					s += '0';
				}
				return s;
			},
			
			bindListen(myChart) {
				// 监听鼠标事件,实现饼图选中效果(单选),近似实现高亮(放大)效果。
				let that = this;
				let selectedIndex = '';
				let hoveredIndex = '';
				// 监听点击事件,实现选中效果(单选)
				myChart.on('click', function(params) {
					// 从 option.series 中读取重新渲染扇形所需的参数,将是否选中取反。
					let isSelected = !that.option.series[params.seriesIndex].pieStatus.selected;
					let isHovered = that.option.series[params.seriesIndex].pieStatus.hovered;
					let k = that.option.series[params.seriesIndex].pieStatus.k;
					let startRatio = that.option.series[params.seriesIndex].pieData.startRatio;
					let endRatio = that.option.series[params.seriesIndex].pieData.endRatio;
					// 如果之前选中过其他扇形,将其取消选中(对 option 更新)
					if (selectedIndex !== '' && selectedIndex !== params.seriesIndex) {
						that.option.series[selectedIndex].parametricEquation = that.getParametricEquation(that.option.series[
								selectedIndex].pieData
							.startRatio, that.option.series[selectedIndex].pieData.endRatio, false, false, k, that.option.series[
								selectedIndex].pieData
							.value);
						that.option.series[selectedIndex].pieStatus.selected = false;
					}
					// 对当前点击的扇形,执行选中/取消选中操作(对 option 更新)
					that.option.series[params.seriesIndex].parametricEquation = that.getParametricEquation(startRatio, endRatio,
						isSelected,
						isHovered, k, that.option.series[params.seriesIndex].pieData.value);
					that.option.series[params.seriesIndex].pieStatus.selected = isSelected;
					// 如果本次是选中操作,记录上次选中的扇形对应的系列号 seriesIndex
					isSelected ? selectedIndex = params.seriesIndex : null;
					// 使用更新后的 option,渲染图表
					myChart.setOption(that.option);
				});
				// 监听 mouseover,近似实现高亮(放大)效果
				myChart.on('mouseover', function(params) {
					// 准备重新渲染扇形所需的参数
					let isSelected;
					let isHovered;
					let startRatio;
					let endRatio;
					let k;
					// 如果触发 mouseover 的扇形当前已高亮,则不做操作
					if (hoveredIndex === params.seriesIndex) {
						return;
						// 否则进行高亮及必要的取消高亮操作
					} else {
						// 如果当前有高亮的扇形,取消其高亮状态(对 option 更新)
						if (hoveredIndex !== '') {
							// 从 option.series 中读取重新渲染扇形所需的参数,将是否高亮设置为 false。
							isSelected = that.option.series[hoveredIndex].pieStatus.selected;
							isHovered = false;
							startRatio = that.option.series[hoveredIndex].pieData.startRatio;
							endRatio = that.option.series[hoveredIndex].pieData.endRatio;
							k = that.option.series[hoveredIndex].pieStatus.k;
							// 对当前点击的扇形,执行取消高亮操作(对 option 更新)
							that.option.series[hoveredIndex].parametricEquation = that.getParametricEquation(startRatio, endRatio,
								isSelected,
								isHovered, k, that.option.series[hoveredIndex].pieData.value);
							that.option.series[hoveredIndex].pieStatus.hovered = isHovered;
							// 将此前记录的上次选中的扇形对应的系列号 seriesIndex 清空
							hoveredIndex = '';
						}
						// 如果触发 mouseover 的扇形不是透明圆环,将其高亮(对 option 更新)
						if (params.seriesName !== 'mouseoutSeries' && params.seriesName !== 'pie2d') {
							// 从 option.series 中读取重新渲染扇形所需的参数,将是否高亮设置为 true。
							isSelected = that.option.series[params.seriesIndex].pieStatus.selected;
							isHovered = true;
							startRatio = that.option.series[params.seriesIndex].pieData.startRatio;
							endRatio = that.option.series[params.seriesIndex].pieData.endRatio;
							k = that.option.series[params.seriesIndex].pieStatus.k;
							// 对当前点击的扇形,执行高亮操作(对 option 更新)
							that.option.series[params.seriesIndex].parametricEquation = that.getParametricEquation(startRatio, endRatio,
								isSelected, isHovered, k, that.option.series[params.seriesIndex].pieData.value + 5);
							that.option.series[params.seriesIndex].pieStatus.hovered = isHovered;
							// 记录上次高亮的扇形对应的系列号 seriesIndex
							hoveredIndex = params.seriesIndex;
						}
						// 使用更新后的 option,渲染图表
						myChart.setOption(that.option);
					}
				});
				// 修正取消高亮失败的 bug
				myChart.on('globalout', function() {
					// 准备重新渲染扇形所需的参数
					let isSelected;
					let isHovered;
					let startRatio;
					let endRatio;
					let k;
					if (hoveredIndex !== '') {
						// 从 option.series 中读取重新渲染扇形所需的参数,将是否高亮设置为 true。
						isSelected = that.option.series[hoveredIndex].pieStatus.selected;
						isHovered = false;
						k = that.option.series[hoveredIndex].pieStatus.k;
						startRatio = that.option.series[hoveredIndex].pieData.startRatio;
						endRatio = that.option.series[hoveredIndex].pieData.endRatio;
						// 对当前点击的扇形,执行取消高亮操作(对 option 更新)
						that.option.series[hoveredIndex].parametricEquation = that.getParametricEquation(startRatio, endRatio,
							isSelected,
							isHovered, k, that.option.series[hoveredIndex].pieData.value);
						that.option.series[hoveredIndex].pieStatus.hovered = isHovered;
						// 将此前记录的上次选中的扇形对应的系列号 seriesIndex 清空
						hoveredIndex = '';
					}
					// 使用更新后的 option,渲染图表
					myChart.setOption(that.option);
				});
			}
		}
	}
</script>
<style lang="less">
	.water-eval-container {
		width: 100%;
		height: 100%;
	}
	.cityGreenLand-charts {
		height: 200px;
		width: 400px;
	}
</style>

以上代码复制拿走就能直接用,还不赶快试试