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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,141 @@ | ||
| import { Events } from "../events"; | ||
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| type Point = {x: number, y: number}; | ||
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| class PolygonSelection { | ||
| activate: () => void; | ||
| deactivate: () => void; | ||
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| constructor(events: Events, parent: HTMLElement) { | ||
| let points: Point[] = []; | ||
| let currentPoint: Point = null; | ||
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| // create svg | ||
| const svg = document.createElementNS("http://www.w3.org/2000/svg", "svg"); | ||
| svg.id = 'polygon-select-svg'; | ||
| svg.classList.add('select-svg'); | ||
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| // create polyline element | ||
| const polyline = document.createElementNS(svg.namespaceURI, 'polyline') as SVGPolylineElement; | ||
| polyline.setAttribute('fill', 'none'); | ||
| polyline.setAttribute('stroke-width', '1'); | ||
| polyline.setAttribute('stroke-dasharray', '5, 5'); | ||
| polyline.setAttribute('stroke-dashoffset', '0'); | ||
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| // create canvas | ||
| const selectCanvas = document.createElement('canvas'); | ||
| selectCanvas.id = 'polygon-select-canvas'; | ||
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| const context = selectCanvas.getContext('2d'); | ||
| context.globalCompositeOperation = 'copy'; | ||
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| const prev = { x: 0, y: 0 }; | ||
| let dragId: number | undefined; | ||
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| const paint = () => { | ||
| polyline.setAttribute('points', [...points, currentPoint].reduce((prev, current) => prev + `${current.x}, ${current.y} `, "")); | ||
| polyline.setAttribute('stroke', isClosed() ? '#fa6' : '#f60'); | ||
| }; | ||
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| const isClosed = () => points.length > 1 && Math.abs(currentPoint.x - points[0].x) < 4 && Math.abs(currentPoint.y - points[0].y) < 4; | ||
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| const pointermove = (e: PointerEvent) => { | ||
| currentPoint = {x: e.offsetX, y: e.offsetY}; | ||
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| if(points.length > 0){ | ||
| paint(); | ||
| } | ||
| }; | ||
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| const pointerdown = (e: PointerEvent) => { | ||
| if (points.length > 0 || (e.pointerType === 'mouse' ? e.button === 0 : e.isPrimary)) { | ||
| e.preventDefault(); | ||
| e.stopPropagation(); | ||
| } | ||
| }; | ||
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| const pointerup = (e: PointerEvent) => { | ||
| if (e.pointerType === 'mouse' ? e.button === 0 : e.isPrimary) { | ||
| e.preventDefault(); | ||
| e.stopPropagation(); | ||
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| if(isClosed()) | ||
| commitSelection(e); | ||
| else | ||
| points.push(currentPoint); | ||
| } | ||
| }; | ||
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| const dblclick = (e: PointerEvent) => { | ||
| if(points.length > 0){ | ||
| points.push(currentPoint); | ||
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| e.preventDefault(); | ||
| e.stopPropagation(); | ||
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| commitSelection(e); | ||
| } | ||
| }; | ||
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| const commitSelection = (e: PointerEvent) => { | ||
| // initialize canvas | ||
| if (selectCanvas.width !== parent.clientWidth || selectCanvas.height !== parent.clientHeight) { | ||
| selectCanvas.width = parent.clientWidth; | ||
| selectCanvas.height = parent.clientHeight; | ||
| } | ||
|
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| // clear canvas | ||
| context.clearRect(0, 0, selectCanvas.width, selectCanvas.height); | ||
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| context.beginPath(); | ||
| context.fillStyle = '#f60'; | ||
| context.beginPath(); | ||
| points.forEach((p, idx) => { | ||
| if(idx === 0){ | ||
| context.moveTo(p.x, p.y); | ||
| } | ||
| else { | ||
| context.lineTo(p.x, p.y); | ||
| } | ||
| }); | ||
| context.closePath(); | ||
| context.fill(); | ||
|
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| events.fire( | ||
| 'select.byMask', | ||
| e.shiftKey ? 'add' : (e.ctrlKey ? 'remove' : 'set'), | ||
| selectCanvas, | ||
| context | ||
| ); | ||
|
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| points = []; | ||
| paint(); | ||
| }; | ||
|
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| this.activate = () => { | ||
| svg.style.display = 'inline'; | ||
| parent.style.display = 'block'; | ||
| parent.addEventListener('pointerdown', pointerdown); | ||
| parent.addEventListener('pointermove', pointermove); | ||
| parent.addEventListener('pointerup', pointerup); | ||
| parent.addEventListener('dblclick', dblclick); | ||
| }; | ||
|
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| this.deactivate = () => { | ||
| // cancel active operation | ||
| svg.style.display = 'none'; | ||
| parent.style.display = 'none'; | ||
| parent.removeEventListener('pointerdown', pointerdown); | ||
| parent.removeEventListener('pointermove', pointermove); | ||
| parent.removeEventListener('pointerup', pointerup); | ||
| parent.removeEventListener('dblclick', dblclick); | ||
| points = []; | ||
| paint(); | ||
| }; | ||
|
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| svg.appendChild(polyline); | ||
| parent.appendChild(svg); | ||
| } | ||
| } | ||
|
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| export { PolygonSelection }; |
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