feat: fill image. (#8)

Author: seven7seven

core/src/replacer/fill-image.ts

@@ -0,0 +1,27 @@
+import { MceImage, MceRect } from '../shapes';
+
+export function fillImage(rect: MceRect, sourceImage: HTMLImageElement): MceImage {
+	const scale = Math.min(rect.width / sourceImage.width, rect.height / sourceImage.height);
+	const cropWidth = rect.width / scale;
+	const cropHeight = rect.height / scale;
+	
+	// Center the crop area
+	const cropY = Math.max(0, (sourceImage.height - cropHeight) / 2);
+	const cropX = Math.max(0, (sourceImage.width - cropWidth) / 2);
+	
+	// Center the image in the rect
+	const left = rect.left + (rect.width - sourceImage.width * scale) / 2;
+	const top = rect.top + (rect.height - sourceImage.height * scale) / 2;
+
+	return new MceImage(sourceImage, {
+		angle: rect.angle,
+		left,
+		top,
+		width: cropWidth,
+		height: cropHeight,
+		scaleX: scale,
+		scaleY: scale,
+		cropY,
+		cropX
+	});
+}

core/src/replacer/index.ts

@@ -1,3 +1,4 @@
 export * from './fit-image';
 export * from './mce-canvas-replacer';
 export * from './stretch-image';
+export * from './fill-image';

core/src/replacer/mce-canvas-replacer.ts

@@ -1,6 +1,7 @@
 import { MceImage, MceRect, MceTextbox } from '../shapes';
 import { fitImage } from './fit-image';
 import { stretchImage } from './stretch-image';
+import { fillImage } from './fill-image';
 import { MceStaticCanvas } from '../mce-static-canvas';
 import { Object as FabricObject } from 'fabric';
 import { loadImage } from './load-image';
@@ -36,7 +37,7 @@ export class MceCanvasReplacer {
 	 * @param mode Mode of fitting image to the rectangle.
 	 * @returns Promise that resolves when the rect is replaced.
 	 */
-	public async replaceRectToImage(layer: MceLayer, sourceImage: HTMLImageElement | string, mode: 'stretch' | 'fit'): Promise<void> {
+	public async replaceRectToImage(layer: MceLayer, sourceImage: HTMLImageElement | string, mode: 'stretch' | 'fit' | 'fill'): Promise<void> {
 		const rect = this.objects[layer.realIndex] as MceRect;
 		if (!rect.visible) {
 			// If the layer is hidden, do nothing.
@@ -54,6 +55,9 @@ export class MceCanvasReplacer {
 			case 'fit':
 				image = fitImage(rect, sourceImage);
 				break;
+			case 'fill':
+				image = fillImage(rect, sourceImage);
+				break;
 			default:
 				throw new Error(`Unknown mode: ${mode}`);
 		}