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  • 3D饼/环Echarts图的实现

    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} 
    }{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 `${params.seriesName}<br/>` +
                                        `<span style="display:inline-block;margin-right:5px;border-radius:10px;10px;height:10px;background-color:${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 {
             100%;
            height: 100%;
        }
        .cityGreenLand-charts {
            height: 200px;
             400px;
        }
    </style>

    本文来自博客园,作者:喆星高照,转载请注明原文链接:https://www.cnblogs.com/houxianzhou/p/14807675.html

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  • 原文地址:https://www.cnblogs.com/houxianzhou/p/14807675.html
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