echarts仪表盘设置图文实例

echarts 图表中经常需要对不同的颜色设置图例标识不同的意义，而仪表盘的指针只存在一个值，如何表示不同颜色的意义，官网配置项并未给出该功能；

不同段的颜色是通过axisLine->lineStyle->color来设置的；

搜索了很多的资料都没有找到用来标识各颜色段的图例；

反复琢磨，可不可以使用有图例的图来强制加上这个图例呢？

这里熟悉echarts的童鞋可能想到解决方法了；

那我们就来使用一招“移花接木”大法；

主要思想：使用柱状图的legend图例，然后设置柱状图和仪表图的层级，然后再隐藏柱状图，禁用legend的点击事件；

注意点：

　　1.series中既有type为‘gauge’的配置项，也有type为‘bar’的配置项，而'bar'类型的配置项只要关注其legend的颜色即可；

　　2.对于柱状图要隐藏的项较多，必须全部设置成不显示，其中包括轴线和分割线等；

　　3.防止奇怪的体验最好将legend的点击事件禁用掉；

  var  option = {
                 legend: {     //配置legend，这里的data，要对应type为‘bar’的series数据项的‘name’名称，作为图例的说明 data:['预热期','导入期','成长期','成熟期','衰退期'],
                     selectedMode:false,  //图例禁止点击 top:20,
                     itemWidth:23,
                     itemHeight:6,
                     textStyle: {
                         color: '#707070',
                         fontStyle: 'normal',
                         fontWeight: 'normal',
                         fontFamily: 'sans-serif',
                         fontSize: 11,
                     },
                 },
                 grid: { 
                     z:1,    //grid作为柱状图的坐标系，其层级要和仪表图层级不同，同时隐藏 show:false,
                     left: '-30%',
                     right: '4%',
                     bottom: '3%',
                     containLabel: true,
                     splitLine:{
                         show: false    //隐藏分割线                     },

                 },
                 xAxis : [   //这里有很多的show，必须都设置成不显示                     {
                         type : 'category',
                         data : [],
                         axisLine: {
                             show: false },
                         splitLine:{
                             show: false },
                         splitArea: {
                             interval: 'auto',
                             show: false }
                     }
                 ],
                 yAxis : [ //这里有很多的show，必须都设置成不显示                     {
                         type : 'value',
                         axisLine: {
                             show: false },
                         splitLine:{
                             show: false },
                     }
                 ],
                 toolbox: {   
                    show: false,
                 },
                series : [   
                         {
                        name:'刻度盘',
                        type: 'gauge',
                        startAngle: 180,
                        endAngle: 0,"center": ["50%", "80%"], //整体的位置设置z: 3,
                        min: min,
                        max: max+min,
                        splitNumber: max,
                        radius: '110%',
                        axisLine: {            // 坐标轴线lineStyle: {       // 属性lineStyle控制线条样式width: 10,
                                color:optionUsedColors
                            }
                        },
                        axisTick: {            // 坐标轴小标记length: 19,        // 属性length控制线长splitNumber: 2,
                            lineStyle: {       // 属性lineStyle控制线条样式color: '#cdcdcd'}
                        },
                        splitLine: {           // 分隔线 length: 20,         // 属性length控制线长 lineStyle: {       // 属性lineStyle（详见lineStyle）控制线条样式 color: 'auto' }
                        },
                        axisLabel: {
                            textStyle: {
                                color:'#454A57'}
                        },
                        pointer: {
                            show: true,
                            length: '70%',
                            width: 5,
                        },
                        itemStyle:{
                            normal:{
                                color:'#454A57',
                                borderWidth:0}
                        },
                        title: {   //仪表盘标题show: true,
                            offsetCenter: ['0', '20'],
                            textStyle: {
                                color: '#444A56',
                                fontSize: 12,
                                fontFamily: 'Microsoft YaHei'}
                        },
                        detail: {
                            textStyle: {
                                fontSize: 12,
                                color: '#707070'},
                            offsetCenter: offsetConfig,
                            formatter: function(){return '上市时间\n'+time;
                            }
                        },
                        data:[{value: (status/100*max || 0), name: '当前阶段'}]                    },
                         {
                        name: '灰色内圈',
                        type: 'gauge',
                        z:2,
                        radius: '110%',
                        startAngle: 180,
                        endAngle: 0,"center": ["50%", "80%"], //整体的位置设置splitNumber: 4,
                        axisLine: { // 坐标轴线lineStyle: { // 属性lineStyle控制线条样式                                color: [
                                    [1, '#F2F4F8']
                                ],
                                width: 24,
                                opacity: 1,
                            }

                        },
                        splitLine: { //分隔线样式show: false,
                        },
                        axisLabel: { //刻度标签show: false,
                        },
                        axisTick: { //刻度样式show: false,
                        },
                        detail : {
                            show:false,
                            textStyle: {       // 其余属性默认使用全局文本样式，详见TEXTSTYLEfontWeight: 'bolder',
                                fontSize:12}
                        },
                    },
                         {
                             name:'预热期',
                             type:'bar',
                             barWidth: '60%',  //不显示，可以随便设置 data:[0],
                             itemStyle: {
                                 normal: {
                                     color: '#41C468',  //这里的图例要注意，颜色设置和仪表盘的颜色对应起来                                 }
                             }
                         },
                         {
                             name:'导入期',
                             type:'bar',
                             barWidth: '60%',
                             data:[0],
                             itemStyle: {
                                 normal: {
                                     color: '#70C1B3',
                                 }
                             }
                         },
                         {
                            name:'成长期',
                            type:'bar',
                            barWidth: '60%',
                            data:[0],
                            itemStyle: {
                                normal: {
                                    color: '#00A1E9',
                                }
                            }
                        },
                         {
                             name:'成熟期',
                             type:'bar',
                             barWidth: '60%',
                             data:[0],
                             itemStyle: {
                                 normal: {
                                     color: '#EE4444',
                                 }
                             }
                         },
                         {
                             name:'衰退期',
                             type:'bar',
                             barWidth: '60%',
                             data:[0],
                             itemStyle: {
                                 normal: {
                                     color: '#DCF2C4',
                                 }
                             }
                         }
                ]
            }

最终的效果图如下，是不是很简单呢。

 

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