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开始使用

legendHighlight 交互的对象是图表组件 legend 。

  • 触发:鼠标悬停在图例项。
  • 结束:鼠标离开图例项。
  • 影响状态:

框选范围的元素变为 active 状态。

框选范围以外的元素变为 inactive 状态。

交互内置状态:

({
// 定义 inactive 状态下的元素透明度为0.5
state: { inactive: { opacity: 0.5 } },
});
example
import { Chart } from '@antv/g2';
const chart = new Chart({
container: 'container',
});
chart
.interval()
.data(profit)
.axis('y', { labelFormatter: '~s' })
.encode('x', 'month')
.encode('y', ['end', 'start'])
.encode(
'color',
d.month === 'Total' ? 'Total' : d.profit > 0 ? 'Increase' : 'Decrease',
)
.state('inactive', { opacity: 0.5 })
.legend('color', {
state: { inactive: { labelOpacity: 0.5, markerOpacity: 0.5 } },
});
chart.interaction('legendHighlight', true);
chart.render();

使用方式

传入 boolean 设置是否开启交互。

({
type: 'interval',
interaction: { legendHighlight: true }, // 采用默认配置
});

配置层级

图例高亮交互可以配置在 View 层级:

chart.interaction('legendHighlight', true);

配置项

当前版本的 LegendHighlgiht 交互无可配置参数。

需要设置 state 的 inactive 状态,可以参照元素状态 state

legend 组件配置

具体文档看图例 legend

事件

获得数据

  • legend:highlight - 当鼠标悬停在图例项上触发
  • legend:unhighlight - 当鼠标离开图例时触发
chart.on('legend:highlight', (e) => {
const { nativeEvent, data } = e;
if (!nativeEvent) return;
console.log(data);
});
chart.on('legend:unhighlight', (e) => {
const { nativeEvent } = e;
if (!nativeEvent) return;
console.log('unhighlight');
});

触发交互

  • legend:highlight - 高亮对应于图例值的数据
  • legend:unhighlight - 取消高亮状态
chart.emit('legend:highlight', {
data: { channel: 'color', value: 'Increase' },
});
chart.emit('legend:unhighlight', {});

示例

下面的示例展示了一个legendHighlight的基本交互功能。

import { Chart } from '@antv/g2';
const chart = new Chart({
container: 'container',
});
chart.options({
type: 'interval',
autoFit: true,
height: 300,
data: [
{ name: 'London', month: 'Jan.', value: 18.9 },
{ name: 'London', month: 'Feb.', value: 28.8 },
{ name: 'London', month: 'Mar.', value: 39.3 },
{ name: 'London', month: 'Apr.', value: 81.4 },
{ name: 'London', month: 'May', value: 47 },
{ name: 'London', month: 'Jun.', value: 20.3 },
{ name: 'London', month: 'Jul.', value: 24 },
{ name: 'London', month: 'Aug.', value: 35.6 },
{ name: 'Berlin', month: 'Jan.', value: 12.4 },
{ name: 'Berlin', month: 'Feb.', value: 23.2 },
{ name: 'Berlin', month: 'Mar.', value: 34.5 },
{ name: 'Berlin', month: 'Apr.', value: 99.7 },
{ name: 'Berlin', month: 'May', value: 52.6 },
{ name: 'Berlin', month: 'Jun.', value: 35.5 },
{ name: 'Berlin', month: 'Jul.', value: 37.4 },
{ name: 'Berlin', month: 'Aug.', value: 42.4 },
],
encode: {
x: 'month',
y: 'value',
color: 'name',
},
transform: [
{
type: 'dodgeX',
groupBy: 'x',
orderBy: 'value',
padding: 0.1,
},
],
interaction: {
legendHighlight: {
series: true,
},
},
state: { inactive: { opacity: 0.5 } },
});
chart.render();