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Merge pull request #818 from tradingview/fancy-canvas-0.3
fancy-canvas 2
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,67 +1,26 @@ | ||
| import { Binding as CanvasCoordinateSpaceBinding, bindToDevicePixelRatio } from 'fancy-canvas/coordinate-space'; | ||
| import { | ||
| bindCanvasElementBitmapSizeTo, | ||
| CanvasElementBitmapSizeBinding, | ||
| Size, | ||
| } from 'fancy-canvas'; | ||
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|
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| import { ensureNotNull } from '../helpers/assertions'; | ||
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| export class Size { | ||
| public h: number; | ||
| public w: number; | ||
|
|
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| public constructor(w: number, h: number) { | ||
| this.w = w; | ||
| this.h = h; | ||
| } | ||
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| public equals(size: Size): boolean { | ||
| return (this.w === size.w) && (this.h === size.h); | ||
| } | ||
| } | ||
|
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| export function getCanvasDevicePixelRatio(canvas: HTMLCanvasElement): number { | ||
| return canvas.ownerDocument && | ||
| canvas.ownerDocument.defaultView && | ||
| canvas.ownerDocument.defaultView.devicePixelRatio | ||
| || 1; | ||
| } | ||
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| export function getContext2D(canvas: HTMLCanvasElement): CanvasRenderingContext2D { | ||
| const ctx = ensureNotNull(canvas.getContext('2d')); | ||
| // sometimes (very often) ctx getContext returns the same context every time | ||
| // and there might be previous transformation | ||
| // so let's reset it to be sure that everything is ok | ||
| // do no use resetTransform to respect Edge | ||
| ctx.setTransform(1, 0, 0, 1, 0, 0); | ||
| return ctx; | ||
| } | ||
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| export function createPreconfiguredCanvas(doc: Document, size: Size): HTMLCanvasElement { | ||
| const canvas = doc.createElement('canvas'); | ||
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| const pixelRatio = getCanvasDevicePixelRatio(canvas); | ||
| // we should keep the layout size... | ||
| canvas.style.width = `${size.w}px`; | ||
| canvas.style.height = `${size.h}px`; | ||
| // ...but multiply coordinate space dimensions to device pixel ratio | ||
| canvas.width = size.w * pixelRatio; | ||
| canvas.height = size.h * pixelRatio; | ||
| return canvas; | ||
| } | ||
|
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| export function createBoundCanvas(parentElement: HTMLElement, size: Size): CanvasCoordinateSpaceBinding { | ||
| export function createBoundCanvas(parentElement: HTMLElement, size: Size): CanvasElementBitmapSizeBinding { | ||
| const doc = ensureNotNull(parentElement.ownerDocument); | ||
| const canvas = doc.createElement('canvas'); | ||
| parentElement.appendChild(canvas); | ||
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| const binding = bindToDevicePixelRatio(canvas, { allowDownsampling: false }); | ||
| binding.resizeCanvas({ | ||
| width: size.w, | ||
| height: size.h, | ||
| const binding = bindCanvasElementBitmapSizeTo(canvas, { | ||
| type: 'device-pixel-content-box', | ||
| options: { | ||
| allowResizeObserver: false, | ||
| }, | ||
| transform: (bitmapSize: Size, canvasElementClientSize: Size) => ({ | ||
| width: Math.max(bitmapSize.width, canvasElementClientSize.width), | ||
| height: Math.max(bitmapSize.height, canvasElementClientSize.height), | ||
| }), | ||
| }); | ||
| binding.resizeCanvasElement(size); | ||
| return binding; | ||
| } | ||
|
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| export function drawScaled(ctx: CanvasRenderingContext2D, ratio: number, func: () => void): void { | ||
| ctx.save(); | ||
| ctx.scale(ratio, ratio); | ||
| func(); | ||
| ctx.restore(); | ||
| } |
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