我希望能够(在图表加载时)在图表上的特定点上显示“十字线”。
我现在的十字准线可以正确显示来自 9 y 轴的数据的十字准线(x 轴是时间一)。
我搜索了文档和示例,但没有看到任何这样的东西。
十字准线文档: https://uber.github.io/react-vis/documentation/api-reference/crosshair https://github.com/uber/react-vis/blob/master/docs/crosshair.md
React vis 事件处理程序: https://github.com/uber/react-vis/blob/master/docs/interaction.md
React 实例: https://uber.github.io/react-vis/
import {
XYPlot,
XAxis,
YAxis,
VerticalGridLines,
HorizontalGridLines,
LineSeries,
Crosshair
} from 'index';
const DATA = [
[{x: 1, y: 10}, {x: 2, y: 7}, {x: 3, y: 15}],
[{x: 1, y: 20}, {x: 2, y: 5}, {x: 3, y: 15}]
];
export default class DynamicCrosshair extends React.Component {
constructor(props) {
super(props);
this.state = {
crosshairValues: []
};
}
/**
* Event handler for onMouseLeave.
* @private
*/
_onMouseLeave = () => {
this.setState({crosshairValues: []});
};
/**
* Event handler for onNearestX.
* @param {Object} value Selected value.
* @param {index} index Index of the value in the data array.
* @private
*/
_onNearestX = (value, {index}) => {
this.setState({crosshairValues: DATA.map(d => d[index])});
};
render() {
return (
<XYPlot onMouseLeave={this._onMouseLeave} width={300} height={300}>
<VerticalGridLines />
<HorizontalGridLines />
<XAxis />
<YAxis />
<LineSeries onNearestX={this._onNearestX} data={DATA[0]} />
<LineSeries data={DATA[1]} />
<Crosshair
values={this.state.crosshairValues}
className={'test-class-name'}
/>
</XYPlot>
);
}
}
在事件处理程序部分,有一个事件处理程序列表,但这些需要用户操作。我希望根据传递给它的状态来更改十字线位置。
根据我已经看到的情况,我不确定这是否可能?我不需要工具提示部分,所以我可以没有它,我所需要的只是十字准线。
感谢您对此问题的任何帮助/回答。
最佳答案
要回答我自己的问题,只需将给定数据的索引传递给十字准线组件即可完成。
示例:
this.state = {
crosshairValues: lines.map(d => d[7])
};
工作示例:
import React, { Component } from 'react';
import './App.css';
import '../node_modules/react-vis/dist/style.css';
import {
XYPlot,
XAxis,
YAxis,
HorizontalGridLines,
VerticalGridLines,
LineSeries,
MarkSeries,
Voronoi,
Crosshair,
GradientDefs,
AreaSeries} from 'react-vis';
const lines = [
[{x: 1, y: 3}, {x: 2, y: 5}, {x: 3, y: 15}, {x: 4, y: 12}, {x: 5, y: 3}, {x: 6, y: 5}, {x: 7, y: 15}, {x: 8, y: 12},
{x: 9, y: 3}, {x: 10, y: 5}, {x: 11, y: 15}, {x: 12, y: 12}, {x: 13, y: 3}, {x: 14, y: 5}, {x: 15, y: 15}, {x: 16, y: 12}],
[{x: 1, y: 10}, {x: 2, y: 4}, {x: 3, y: 2}, {x: 4, y: 15}, {x: 5, y: 2}, {x: 6, y: 7}, {x: 7, y: 11}, {x: 8, y: 8},
{x: 9, y: 10}, {x: 10, y: 4}, {x: 11, y: 2}, {x: 12, y: 15}, {x: 13, y: 2}, {x: 14, y: 7}, {x: 15, y: 11}, {x: 16, y: 8}],
[{x: 1, y: 7}, {x: 2, y: 11}, {x: 3, y: 9}, {x: 4, y: 4}, {x: 5, y: 6}, {x: 6, y: 13}, {x: 7, y: 5}, {x: 8, y: 13},
{x: 9, y: 7}, {x: 10, y: 11}, {x: 11, y: 9}, {x: 12, y: 4}, {x: 13, y: 6}, {x: 14, y: 13}, {x: 15, y: 5}, {x: 16, y: 13}]
].map((p, i) => p.map(d => ({...d, line: i})));
const nodes = lines.reduce((acc, d) => [...acc, ...d], []);
const getDomain = (data, key) => {
const {min, max} = data.reduce(
(acc, row) => ({
min: Math.min(acc.min, row[key]),
max: Math.max(acc.max, row[key])
}),
{min: Infinity, max: -Infinity}
);
return [min, max];
};
const xDomain = getDomain(nodes, 'x');
const yDomain = getDomain(nodes, 'y');
export default class Example extends React.Component {
constructor(props) {
super(props);
this.state = {
crosshairValues: lines.map(d => d[7])
};
}
state = {
hoveredNode: null
};
_onMouseLeave = () => {
this.setState({crosshairValues: []});
};
_onNearestX = (value, {index}) => {
this.setState({crosshairValues: lines.map(d => d[index])});
};
render() {
const {hoveredNode} = this.state;
return (
<div>
<XYPlot
xDomain={xDomain}
yDomain={yDomain}
margin={{top: 10, left: 40, bottom: 40, right: 10}}
width={1900}
height={300}
onMouseLeave={this._onMouseLeave}
>
<GradientDefs>
<linearGradient id="CoolGradient" x1="0" x2="0" y1="0" y2="1">
<stop offset="0%" stopColor="red" stopOpacity={0.4}/>
<stop offset="100%" stopColor="blue" stopOpacity={0.3} />
</linearGradient>
</GradientDefs>
<HorizontalGridLines />
<VerticalGridLines />
<XAxis title="X Axis" />
<YAxis title="Y Axis" />
{lines.map((d, i) => (
<AreaSeries
color={'url(#CoolGradient)'}
key={i}
opacity={hoveredNode && hoveredNode.line === i ? 1 : 0.3}
data={d}
onNearestX={this._onNearestX}
/>
))}
<Crosshair
values={this.state.crosshairValues}
className={'test-class-name'}
/>
</XYPlot>
</div>
);
}
}
希望这能节省其他人的时间。
关于react-vis - “react-vis”我如何在特定点上显示十字准线,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/57036434/