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VoronoiChart.js
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VoronoiChart.js
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import { RectClipPath } from '@vx/clip-path';
import { localPoint } from '@vx/event';
import { GradientOrangeRed, GradientPinkRed } from '@vx/gradient';
import { Group } from '@vx/group';
import { scaleLinear } from '@vx/scale';
import { voronoi, VoronoiPolygon } from '@vx/voronoi';
import { extent } from 'd3-array';
import React from 'react';
const neighborRadius = 75;
const data = Array(200)
.fill(null)
.map(() => ({
x: Math.random(),
y: Math.random(),
id: Math.random()
.toString(36)
.slice(2)
}));
class VoronoiChart extends React.PureComponent {
static getUpdatedState(props) {
const { width, height, margin } = props;
const innerWidth = width - margin.left - margin.right;
const innerHeight = height - margin.top - margin.bottom;
const xScale = scaleLinear({
domain: extent(data, d => d.x),
range: [0, innerWidth]
});
const yScale = scaleLinear({
domain: extent(data, d => d.y),
range: [innerHeight, 0]
});
const voronoiDiagram = voronoi({
x: d => xScale(d.x),
y: d => yScale(d.y),
width: innerWidth,
height: innerHeight
})(data);
return {
selected: null,
selectedNeighbors: null,
xScale,
yScale,
voronoiDiagram,
innerWidth,
innerHeight
};
}
constructor(props) {
super(props);
this.handleMouseMove = this.handleMouseMove.bind(this);
this.state = VoronoiChart.getUpdatedState(props);
}
componentWillReceiveProps(nextProps) {
if (nextProps.width !== this.props.width || nextProps.height !== this.props.height) {
this.setState(VoronoiChart.getUpdatedState(nextProps));
}
}
handleMouseMove(event) {
const { voronoiDiagram } = this.state;
const { x, y } = localPoint(this.svg, event);
const closest = voronoiDiagram.find(x, y, neighborRadius);
if (closest) {
const neighbors = {};
const cell = voronoiDiagram.cells[closest.index];
cell.halfedges.forEach(index => {
const edge = voronoiDiagram.edges[index];
const { left, right } = edge;
if (left && left !== closest) neighbors[left.data.id] = true;
else if (right && right !== closest) neighbors[right.data.id] = true;
});
this.setState({ selected: closest, neighbors });
}
}
render() {
const { width, height, margin } = this.props;
const {
voronoiDiagram,
innerWidth,
innerHeight,
xScale,
yScale,
selected,
neighbors
} = this.state;
const polygons = voronoiDiagram.polygons();
return (
<svg
width={width}
height={height}
ref={ref => {
this.svg = ref;
}}
>
<GradientOrangeRed id="voronoi_orange_red" />
<GradientPinkRed id="voronoi_pink_red" />
<RectClipPath id="voronoi_clip" width={innerWidth} height={innerHeight} rx={14} />
<Group
top={margin.top}
left={margin.left}
clipPath="url(#voronoi_clip)"
onMouseMove={this.handleMouseMove}
onMouseLeave={() => {
this.setState({ selected: null, neighbors: null });
}}
>
{polygons.map(polygon => (
<VoronoiPolygon
key={`polygon-${polygon.data.id}`}
polygon={polygon}
fill={
selected && (polygon.data.id === selected.data.id || neighbors[polygon.data.id])
? 'url(#voronoi_orange_red)'
: 'url(#voronoi_pink_red)'
}
fillOpacity={neighbors && neighbors[polygon.data.id] ? 0.4 : 1}
stroke="#fff"
strokeWidth={1}
/>
))}
{data.map(d => (
<circle
key={`circle-${d.id}`}
r={2}
cx={xScale(d.x)}
cy={yScale(d.y)}
fill="#ffffff"
fillOpacity={0.5}
/>
))}
</Group>
</svg>
);
}
}
export default ({ width, height, margin, events }) => (
<VoronoiChart width={width} height={height} events={events} margin={margin} />
);