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在echarts 中实现渐变的具体几种方式
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:
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} <br/>{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:
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' } ]};
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