echarts中几种渐变方式的具体实现方式

在echarts 中实现渐变的具体几种方式

在我们日常使用Echarts图表过程中,会遇到一些要求我们的echarts图表能实现颜色渐变,以下几种方式就能满足你的需求。文档参考 ECharts option 文档 。

方式一:

线性渐变:new echarts.graphic.LinearGradient(x,y,x2,y2,offset,boolean)

  • x,y,x2,y2,包围框中的百分比,数值范围 0-1;
  • offset,类似颜色线性梯度,数值范围 0-1;
  • boolean,默认false,若最后参数为true,前四个参数将使用像素位置。

径向渐变:new echarts.graphic.RadialGradient(x,y,r,offset,boolean)

  • x,y,代表圆心,数值范围 0-1;
  • r,代表半径,数值范围 0-1;
  • offset,类似颜色线性梯度,数值范围 0-1;
  • boolean,默认false,若最后参数为true,前四个参数将使用像素位置。

采用图片显示:new echarts.graphic.Pattern(imageDom,repeat)

  • imageDom,仅支持 HTMLImageElement 和 HTMLCanvasElement形式图片;
  • repeat,默认’repeat’,可取值还有’repeat-x’, ‘repeat-y’, or ‘no-repeat’;

代码示例:

// 创建 HTMLImageElement
// HTMLCanvasElement请自行研究去
var imageDom = new Image(); // Image 构造函数
imageDom.src = '/static/img/map_bg.png'; // 图片路径
imageDom.alt = '这是一张图片';

// 应用如下
// color:{
//   image: imageDom, // 支持为 HTMLImageElement, HTMLCanvasElement,不支持路径字符串
//    repeat: 'repeat' // 是否平铺,可以是 'repeat-x', 'repeat-y', 'no-repeat'
// }

方式二:colorStops

线性渐变:colorStops - linear

  • type:‘linear’,线性渐变
  • x,y,x2,y2,代表包围框中的百分比,数值范围 0-1;
  • colorStops,类似颜色线性梯度,数值范围 0-1;
  • global,默认false

径向渐变:colorStops - radial

  • type:‘radial’,径向渐变
  • x,y,代表圆心,数值范围 0-1;
  • r,代表半径,数值范围 0-1;
  • colorStops,类似颜色线性梯度,数值范围 0-1;
  • global,默认false

效果图:

echarts中几种渐变方式的具体实现方式_第1张图片

代码如下:

var imageDom = new Image(); // Image 构造函数
imageDom.src = 'https://github.com/iuvc/magicJs/blob/main/public/images/issues/blue-white-background.jpg?raw=true';
imageDom.alt = '测试';
option = {
  title: {
    text: 'echarts 渐变',
    left: 'center'
  },
  tooltip: {
    trigger: 'item',
    formatter: '{a} 
{b} : {c} ({d}%)' }, legend: { top: 40, left: 0, orient: 'vertical', data: [ '线性渐变区域 LinearGradient', '径向渐变区域 RadialGradient', '线性渐变区域 ColorStep-linear', '径向渐变区域 ColorStep-radial', '图片显示' ] }, series: [ { name: 'Radius Mode', type: 'pie', radius: [20, '70%'], center: ['50%', '50%'], roseType: 'radius', itemStyle: { borderRadius: 5 }, label: { show: true }, emphasis: { label: { show: true } }, data: [ { value: 40, name: '线性渐变区域 LinearGradient', itemStyle: { // 线性渐变方式一 ====================================================== // LinearGradient前四个分参数别代表右,下,左,上,数值0-1 color: new echarts.graphic.LinearGradient(0, 0, 0, 1, [ { offset: 0, color: 'rgba(255,174,19,0.7)' }, { offset: 1, color: 'rgba(255,174,19,0.05)' } ]) } }, { value: 40, name: '径向渐变区域 RadialGradient', itemStyle: { // 径向渐变方式一 ====================================================== // RadialGradient前三个分参数别代表圆心(x,y),半径(数值0-1) color: new echarts.graphic.RadialGradient(0.5, 0.5, 0.8, [ { offset: 0, color: 'rgba(255,154,119,1)' }, { offset: 1, color: 'rgba(255,154,119,0.05)' } ]) } }, { value: 33, name: '线性渐变区域 ColorStep-linear', itemStyle: { // 线性渐变方式二 ====================================================== // x,y,x2,y2数值同LinearGradient前四个参数分别代表右,下,左,上,数值0-1 color: { type: 'linear', x: 0, y: 0, x2: 0, y2: 1, colorStops: [ { offset: 0, color: 'rgba(60,216,208,0.7)' // 0% 处的颜色 }, { offset: 1, color: 'rgba(60,216,208,0.05)' // 100% 处的颜色 } ], global: false // 缺省为 false } } }, { value: 28, name: '径向渐变区域 ColorStep-radial', itemStyle: { // 径向渐变方式二 ====================================================== // x 0.5 y 0.5 代表圆心,r 代表半径 color: { type: 'radial', x: 0.5, y: 0.5, r: 0.9, colorStops: [ { offset: 0, color: 'rgba(82,216,60, 0.7)' // 0% 处的颜色 }, { offset: 1, color: 'rgba(82,216,60, 0.05)' // 100% 处的颜色 } ], global: false // 缺省为 false } } }, { value: 22, name: '图片显示' , itemStyle: { // 图片显示 ====================================================== color: { image: imageDom, // 支持为 HTMLImageElement, HTMLCanvasElement,不支持路径字符串 repeat: 'repeat' // 是否平铺,可以是 'repeat-x', 'repeat-y', 'no-repeat' } } } ] } ] };

其他示例:

echarts中几种渐变方式的具体实现方式_第2张图片

代码如下:

option = {
  title: {
    text: '渐变区域图'
  },
  tooltip: {
    trigger: 'axis',
    axisPointer: {
      type: 'cross',
      label: {
        backgroundColor: '#6a7985'
      }
    }
  },
  legend: {
    top: 15,
    data: [
      '线性渐变区域 LinearGradient',
      '线性渐变区域 ColorStep-linear',
      '径向渐变区域 ColorStep-radial',
      '径向渐变区域 RadialGradient'
    ]
  },
  grid: {
    top: 55,
    left: 45,
    right: 15,
    bottom: 25
  },
  xAxis: [
    {
      type: 'category',
      boundaryGap: true,
      axisLine: {
        show: false,
        onZero: true,
        lineStyle: {
          color: '#999999'
        }
      },
      splitLine: {
        show: false
      },
      axisTick: {
        show: false
      },
      data: [
        '00:00',
        '00:15',
        '00:30',
        '00:45',
        '01:00',
        '01:15',
        '01:30',
        '01:45',
        '02:00',
        '02:15',
        '02:30',
        '02:45',
        '03:00',
        '03:15',
        '03:30',
        '03:45',
        '04:00',
        '04:15',
        '04:30',
        '04:45',
        '05:00',
        '05:15',
        '05:30',
        '05:45',
        '06:00',
        '06:15',
        '06:30',
        '06:45',
        '07:00',
        '07:15',
        '07:30',
        '07:45',
        '08:00',
        '08:15',
        '08:30',
        '08:45',
        '09:00',
        '09:15',
        '09:30',
        '09:45',
        '10:00',
        '10:15',
        '10:30',
        '10:45',
        '11:00',
        '11:15'
      ]
    }
  ],
  yAxis: [
    {
      type: 'category',
      boundaryGap: true,
      axisLine: {
        show: false,
        onZero: true,
        lineStyle: {
          color: '#999999'
        }
      },
      splitLine: {
        show: false
      },
      axisTick: {
        show: false
      }
    }
  ],
  series: [
    {
      name: '线性渐变区域 LinearGradient',
      type: 'line',
      stack: '总量',
      data: [
        1.67, 1.25, 1.02, 1.44, 1.81, 1.13, 1.58, 1.13, 1.56, 1.3, 1.9, 1.3,
        1.55, 1.94, 1.69, 1.69, 1.8, 1.21, 1.29, 1.58, 1.04, 1.67, 1.07, 1.18,
        1.57, 1.05, 1.63, 1.28, 1.28, 1.58, 1.88, 1.2, 1.63, 1.59, 1.43, 1.25,
        1.68, 1.25, 1.12, 1.31, 1.6, 1.62, 1.57, 1.2, 1.02, 1.42, 1.91, 1.97,
        1.32, 1.06, 1.3, 1.22, 1.74, 1.02, 1.75, 1.2
      ],
      areaStyle: {
        color: new echarts.graphic.LinearGradient(0, 0, 0, 1, [
          {
            offset: 0,
            color: 'rgba(255,174,19,0.7)'
          },
          {
            offset: 1,
            color: 'rgba(255,174,19,0.05)'
          }
        ])
      },
      itemStyle: {
        color: 'rgba(255,174,19,.1)'
      },
      lineStyle: {
        color: 'rgba(255,174,19,.1)'
      },
      smooth: true,
      smoothMonotone: 'x',
      symbol: 'circle'
    },
    {
      name: '线性渐变区域 ColorStep-linear',
      type: 'line',
      stack: '总量',
      data: [
        2.31, 2.27, 1.64, 1.56, 1.75, 1.62, 2.18, 2.12, 1.97, 2.45, 2.39, 2.3,
        1.78, 1.82, 1.82, 1.76, 1.78, 1.63, 1.54, 1.6, 1.61, 1.68, 1.67, 1.67,
        2.34, 1.69, 2.18, 2.25, 2.44, 2.4, 1.97, 2.05, 2.05, 2.46, 1.62, 1.66,
        1.66, 1.87, 1.59, 1.99, 2.45, 2.05, 1.53, 2.39, 1.77, 1.99, 2.14, 2.33,
        1.55, 1.87, 1.65, 2.02, 1.68, 2.13, 1.88, 2.19
      ],
      areaStyle: {
        color: {
          type: 'linear',
          x: 0,
          y: 0,
          x2: 0,
          y2: 1,
          colorStops: [
            {
              offset: 0,
              color: 'rgba(60,216,208,0.7)' // 0% 处的颜色
            },
            {
              offset: 1,
              color: 'rgba(60,216,208,0.05)' // 100% 处的颜色
            }
          ],
          global: false // 缺省为 false
        }
      },
      itemStyle: {
        color: 'rgba(60,216,208,.1)'
      },
      lineStyle: {
        color: 'rgba(60,216,208,.1)'
      },
      smooth: true,
      smoothMonotone: 'x',
      symbol: 'circle'
    },
    {
      name: '径向渐变区域 RadialGradient',
      type: 'line',
      stack: '总量',
      label: {
        normal: {
          show: true,
          position: 'top'
        }
      },
      data: [
        2.69, 2.47, 2.53, 3.31, 3.25, 3.12, 2.66, 2.58, 3.01, 3.21, 2.69, 2.72,
        2.67, 3.34, 3.21, 2.79, 3.23, 3.07, 2.84, 2.46, 3.25, 2.92, 2.42, 2.61,
        2.83, 3.29, 2.44, 3.38, 2.82, 2.56, 2.94, 2.42, 2.95, 2.82, 3.18, 2.6,
        2.91, 3.07, 2.57, 2.45, 2.45, 2.94, 2.86, 3.12, 3.07, 3.02, 2.53, 2.64,
        2.97, 2.62, 2.79, 2.68, 3.24, 3.38, 2.67, 3.17
      ],
      areaStyle: {
        color: new echarts.graphic.RadialGradient(0.5, 0.5, 0.8, [
          {
            offset: 0,
            color: 'rgba(255,154,119,.7)'
          },
          {
            offset: 1,
            color: 'rgba(255,154,119,0.05)'
          }
        ])
      },
      itemStyle: {
        color: 'rgba(255,154,119,.1)'
      },
      lineStyle: {
        color: 'rgba(255,154,119,.1)'
      },
      smooth: true,
      smoothMonotone: 'x',
      symbol: 'circle'
    },
    {
      name: '径向渐变区域 ColorStep-radial',
      type: 'line',
      stack: '总量',
      label: {
        normal: {
          show: true,
          position: 'top'
        }
      },
      data: [
        2.79, 2.57, 2.63, 3.41, 3.35, 3.22, 2.76, 2.68, 3.11, 3.31, 2.79, 2.82,
        2.77, 3.44, 3.31, 2.89, 3.33, 3.17, 2.94, 2.56, 3.35, 3.02, 2.52, 2.71,
        2.93, 3.39, 2.54, 3.48, 2.92, 2.66, 3.04, 2.52, 3.05, 2.92, 3.28, 2.7,
        3.01, 3.17, 2.67, 2.55, 2.55, 3.04, 2.96, 3.22, 3.17, 3.12, 2.63, 2.74,
        3.07, 2.72, 2.89, 2.78, 3.34, 3.48, 2.77, 3.27
      ],
      areaStyle: {
        color: {
          type: 'radial',
          x: 0.5,
          y: 0.5,
          r: 0.9,
          colorStops: [
            {
              offset: 0,
              color: 'rgba(82,216,60, 0.7)' // 0% 处的颜色
            },
            {
              offset: 1,
              color: 'rgba(82,216,60, 0.05)' // 100% 处的颜色
            }
          ],
          global: false // 缺省为 false
        }
      },
      itemStyle: {
        color: 'rgba(82,216,60,.1)'
      },
      lineStyle: {
        color: 'rgba(82,216,60,.1)'
      },
      smooth: true,
      smoothMonotone: 'x',
      symbol: 'circle'
    }
  ]
};

总结

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