70 lines
2.4 KiB
TypeScript
70 lines
2.4 KiB
TypeScript
import { IAnimationData } from './Interfaces/IAnimationData';
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import { ICanvasData } from './Interfaces/ICanvasData';
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// I display the canvas and am clickable
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export class CanvasHandler {
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private canvasImage: HTMLCanvasElement;
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private imageElement: HTMLImageElement;
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private animationData: IAnimationData;
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private canvasData: ICanvasData;
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private orginInfo: HTMLElement;
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private targetImageSize: number = 256;
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constructor(
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animationData: IAnimationData,
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canvasData: ICanvasData,
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canvasImage: HTMLCanvasElement,
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imageElement: HTMLImageElement,
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originInfo: HTMLElement
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) {
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this.animationData = animationData;
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this.canvasData = canvasData;
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this.canvasImage = canvasImage;
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this.imageElement = imageElement;
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this.orginInfo = originInfo;
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this.ResizeCanvas();
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this.UpdateCanvasDataSize();
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const canvasContext: CanvasRenderingContext2D = this.canvasImage.getContext('2d')!;
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canvasContext.fillRect(0, 0, this.targetImageSize, this.targetImageSize);
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canvasContext.imageSmoothingEnabled = false;
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this.canvasImage.addEventListener('click', this.mouseDown);
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}
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public ResizeCanvas() {
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// get image ratio, then scale default width by it
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const hwratio = this.imageElement.height / this.imageElement.width;
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const newWidth = this.targetImageSize / hwratio;
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const newHeight = this.targetImageSize;
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console.log('hwratio = ' + hwratio);
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this.canvasImage.width = newWidth;
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this.canvasImage.height = newHeight;
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this.UpdateCanvasDataSize();
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}
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private UpdateCanvasDataSize() {
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this.canvasData.width = this.canvasImage.width;
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this.canvasData.height = this.canvasImage.height;
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}
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private mouseDown = (event: MouseEvent) => {
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// get position
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const ratioWidth: number = this.canvasImage.width / this.imageElement.width;
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const ratioHeight: number = this.canvasImage.height / this.imageElement.height;
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// get origin in pixels
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const pixelX: number = Math.floor(event.offsetX / ratioWidth);
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const pixelY: number = Math.floor(event.offsetY / ratioHeight);
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console.log('CLICK X:' + pixelX + ' Y:' + pixelY);
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// update animation data
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this.animationData.originX = pixelX;
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this.animationData.originY = pixelY;
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// update canvas data
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this.canvasData.widthRatio = ratioWidth;
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this.canvasData.heightRatio = ratioHeight;
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// update origin number display
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this.orginInfo.innerText = 'Origin X: ' + this.animationData.originX + ' Y: ' + this.animationData.originY;
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};
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}
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