Created
April 18, 2017 23:57
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@vx/brush sketch
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| import React from 'react'; | |
| export default function Brush({ brush }) { | |
| const { start, end, dragging } = brush; | |
| return ( | |
| <g className="vx-brush"> | |
| {start && dragging && | |
| <circle | |
| cx={start.x} | |
| cy={start.y} | |
| r={3} | |
| fill='blue' | |
| /> | |
| } | |
| {end && dragging && | |
| <circle | |
| cx={end.x} | |
| cy={end.y} | |
| r={3} | |
| fill='red' | |
| /> | |
| } | |
| {dragging && end && | |
| <rect | |
| fill={'rgba(0,0,220,0.4)'} | |
| x={end.x > start.x ? start.x : end.x} | |
| y={end.y > start.y ? start.y : end.y} | |
| width={end.x > start.x ? end.x - start.x : start.x - end.x} | |
| height={end.y > start.y ? end.y - start.y : start.y - end.y} | |
| /> | |
| } | |
| </g> | |
| ); | |
| } |
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| import React from 'react'; | |
| import withBrush from './withBrush'; | |
| import Brush from './Brush'; | |
| class BrushChart extends React.Component { | |
| constructor() { | |
| super(); | |
| this.handleMouseDown = this.handleMouseDown.bind(this); | |
| this.handleMouseMove = this.handleMouseMove.bind(this); | |
| this.handleMouseUp = this.handleMouseUp.bind(this); | |
| } | |
| handleMouseDown(event) { | |
| event.persist(); | |
| const { brushStart } = this.props; | |
| brushStart(this.svg, event); | |
| } | |
| handleMouseMove(event) { | |
| event.persist(); | |
| const { brush, brushMove } = this.props; | |
| if (brush.start && brush.dragging) brushMove(this.svg, event); | |
| } | |
| handleMouseUp(event) { | |
| event.persist(); | |
| const { brush, brushEnd } = this.props; | |
| if (brush.end) brushEnd(this.svg, event); | |
| } | |
| render() { | |
| const { width, height, brush } = this.props; | |
| return ( | |
| <svg | |
| ref={(c) => { this.svg = c; }} | |
| width={width} | |
| height={height} | |
| onMouseDown={this.handleMouseDown} | |
| onMouseMove={this.handleMouseMove} | |
| onMouseUp={this.handleMouseUp} | |
| > | |
| <Brush brush={brush} /> | |
| </svg> | |
| ); | |
| } | |
| } | |
| export default addBrush(BrushChart); |
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| import { compose, withState, withHandlers } from 'recompose'; | |
| export default compose( | |
| withState('brush', 'updateBrush', { | |
| start: undefined, | |
| end: undefined, | |
| dragging: false, | |
| }), | |
| withHandlers({ | |
| brushStart: ({ updateBrush }) => (node, event) => { | |
| updateBrush((prevState) => ({ | |
| ...prevState, | |
| start: getCoordsFromEvent(node, event), | |
| dragging: true, | |
| end: undefined, | |
| })) | |
| }, | |
| brushMove: ({ updateBrush }) => (node, event) => { | |
| updateBrush((prevState) => ({ | |
| ...prevState, | |
| end: getCoordsFromEvent(node, event), | |
| })) | |
| }, | |
| brushEnd: ({ updateBrush }) => (node, event) => { | |
| updateBrush((prevState) => ({ | |
| ...prevState, | |
| dragging: false, | |
| })) | |
| }, | |
| }) | |
| ); | |
| function getCoordsFromEvent(node, event) { | |
| if (!node) return; | |
| const svg = node.ownerSVGElement || node; | |
| if (svg.createSVGPoint) { | |
| let point = svg.createSVGPoint(); | |
| point.x = event.clientX; | |
| point.y = event.clientY; | |
| point = point.matrixTransform(node.getScreenCTM().inverse()); | |
| return {x: point.x, y: point.y}; | |
| } | |
| var rect = node.getBoundingClientRect(); | |
| return { | |
| x: event.clientX - rect.left - node.clientLeft, | |
| y: event.clientY - rect.top - node.clientTop | |
| }; | |
| } |
Author
hshoff
commented
Apr 18, 2017
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