ngx-image-cropper
Version:
An image cropper for Angular
140 lines • 26.3 kB
JavaScript
import { resizeCanvas } from '../utils/resize.utils';
import { percentage } from '../utils/percentage.utils';
export class CropService {
crop(input, output) {
const imagePosition = this.getImagePosition(input);
const width = imagePosition.x2 - imagePosition.x1;
const height = imagePosition.y2 - imagePosition.y1;
const cropCanvas = document.createElement('canvas');
cropCanvas.width = width;
cropCanvas.height = height;
const ctx = cropCanvas.getContext('2d');
if (!ctx) {
return null;
}
if (input.options?.backgroundColor != null) {
ctx.fillStyle = input.options.backgroundColor;
ctx.fillRect(0, 0, width, height);
}
const scaleX = (input.transform?.scale || 1) * (input.transform?.flipH ? -1 : 1);
const scaleY = (input.transform?.scale || 1) * (input.transform?.flipV ? -1 : 1);
const { translateH, translateV } = this.getCanvasTranslate(input);
const transformedImage = input.loadedImage.transformed;
ctx.setTransform(scaleX, 0, 0, scaleY, transformedImage.size.width / 2 + translateH, transformedImage.size.height / 2 + translateV);
ctx.translate(-imagePosition.x1 / scaleX, -imagePosition.y1 / scaleY);
ctx.rotate((input.transform?.rotate || 0) * Math.PI / 180);
ctx.drawImage(transformedImage.image, -transformedImage.size.width / 2, -transformedImage.size.height / 2);
const result = {
width, height,
imagePosition,
cropperPosition: { ...input.cropper }
};
if (input.options?.containWithinAspectRatio) {
result.offsetImagePosition = this.getOffsetImagePosition(input);
}
const resizeRatio = this.getResizeRatio(width, height, input.options);
if (resizeRatio !== 1) {
result.width = Math.round(width * resizeRatio);
result.height = input.options?.maintainAspectRatio
? Math.round(result.width / (input.options?.aspectRatio ?? 1))
: Math.round(height * resizeRatio);
resizeCanvas(cropCanvas, result.width, result.height);
}
if (output === 'blob') {
return this.cropToBlob(result, cropCanvas, input);
}
else {
result.base64 = cropCanvas.toDataURL('image/' + (input.options?.format ?? 'png'), this.getQuality(input.options));
return result;
}
}
async cropToBlob(output, cropCanvas, input) {
output.blob = await new Promise(resolve => cropCanvas.toBlob(resolve, 'image/' + (input.options?.format ?? 'png'), this.getQuality(input.options)));
if (output.blob) {
output.objectUrl = URL.createObjectURL(output.blob);
}
return output;
}
getCanvasTranslate(input) {
if (input.transform?.translateUnit === 'px') {
const ratio = this.getRatio(input);
return {
translateH: (input.transform?.translateH || 0) * ratio,
translateV: (input.transform?.translateV || 0) * ratio
};
}
else {
return {
translateH: input.transform?.translateH ? percentage(input.transform.translateH, input.loadedImage.transformed.size.width) : 0,
translateV: input.transform?.translateV ? percentage(input.transform.translateV, input.loadedImage.transformed.size.height) : 0
};
}
}
getRatio(input) {
return input.loadedImage.transformed.size.width / input.maxSize.width;
}
getImagePosition(cropperState) {
const ratio = this.getRatio(cropperState);
const x1 = Math.round(cropperState.cropper.x1 * ratio);
const y1 = Math.round(cropperState.cropper.y1 * ratio);
const out = {
x1,
y1,
x2: x1 + Math.round((cropperState.cropper.x2 - cropperState.cropper.x1) * ratio),
y2: y1 + Math.round((cropperState.cropper.y2 - cropperState.cropper.y1) * ratio)
};
if (!cropperState.options?.containWithinAspectRatio) {
out.x1 = Math.max(out.x1, 0);
out.y1 = Math.max(out.y1, 0);
out.x2 = Math.min(out.x2, cropperState.loadedImage.transformed.size.width);
out.y2 = Math.min(out.y2, cropperState.loadedImage.transformed.size.height);
}
return out;
}
getOffsetImagePosition(input) {
const canvasRotation = (input.options?.canvasRotation ?? 0) + input.loadedImage.exifTransform.rotate;
const ratio = this.getRatio(input);
let offsetX;
let offsetY;
if (canvasRotation % 2) {
offsetX = (input.loadedImage.transformed.size.width - input.loadedImage.original.size.height) / 2;
offsetY = (input.loadedImage.transformed.size.height - input.loadedImage.original.size.width) / 2;
}
else {
offsetX = (input.loadedImage.transformed.size.width - input.loadedImage.original.size.width) / 2;
offsetY = (input.loadedImage.transformed.size.height - input.loadedImage.original.size.height) / 2;
}
const cropper = input.cropper;
const out = {
x1: Math.round(cropper.x1 * ratio) - offsetX,
y1: Math.round(cropper.y1 * ratio) - offsetY,
x2: Math.round(cropper.x2 * ratio) - offsetX,
y2: Math.round(cropper.y2 * ratio) - offsetY
};
if (!input.options?.containWithinAspectRatio) {
out.x1 = Math.max(out.x1, 0);
out.y1 = Math.max(out.y1, 0);
out.x2 = Math.min(out.x2, input.loadedImage.transformed.size.width);
out.y2 = Math.min(out.y2, input.loadedImage.transformed.size.height);
}
return out;
}
getResizeRatio(width, height, options) {
const ratios = new Array();
if (options?.resizeToWidth && options.resizeToWidth > 0) {
ratios.push(options.resizeToWidth / width);
}
if (options?.resizeToHeight && options.resizeToHeight > 0) {
ratios.push(options.resizeToHeight / height);
}
const result = ratios.length === 0 ? 1 : Math.min(...ratios);
if (result > 1 && !options?.onlyScaleDown) {
return result;
}
return Math.min(result, 1);
}
getQuality(options) {
return Math.min(1, Math.max(0, (options?.imageQuality ?? 92) / 100));
}
}
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{ CropperPosition, ImageCroppedEvent } from '../interfaces';\nimport { resizeCanvas } from '../utils/resize.utils';\nimport { percentage } from '../utils/percentage.utils';\nimport { OutputType } from '../interfaces/cropper-options.interface';\nimport { CropInput } from '../interfaces/crop-input.interface';\n\nexport class CropService {\n\n  crop(input: CropInput, output: 'blob'): Promise<ImageCroppedEvent> | null;\n  crop(input: CropInput, output: 'base64'): ImageCroppedEvent | null;\n  crop(input: CropInput, output: OutputType): Promise<ImageCroppedEvent> | ImageCroppedEvent | null {\n    const imagePosition = this.getImagePosition(input);\n    const width = imagePosition.x2 - imagePosition.x1;\n    const height = imagePosition.y2 - imagePosition.y1;\n    const cropCanvas = document.createElement('canvas') as HTMLCanvasElement;\n    cropCanvas.width = width;\n    cropCanvas.height = height;\n\n    const ctx = cropCanvas.getContext('2d');\n    if (!ctx) {\n      return null;\n    }\n    if (input.options?.backgroundColor != null) {\n      ctx.fillStyle = input.options.backgroundColor;\n      ctx.fillRect(0, 0, width, height);\n    }\n\n    const scaleX = (input.transform?.scale || 1) * (input.transform?.flipH ? -1 : 1);\n    const scaleY = (input.transform?.scale || 1) * (input.transform?.flipV ? -1 : 1);\n    const {translateH, translateV} = this.getCanvasTranslate(input);\n\n    const transformedImage = input.loadedImage!.transformed;\n    ctx.setTransform(scaleX, 0, 0, scaleY, transformedImage.size.width / 2 + translateH, transformedImage.size.height / 2 + translateV);\n    ctx.translate(-imagePosition.x1 / scaleX, -imagePosition.y1 / scaleY);\n    ctx.rotate((input.transform?.rotate || 0) * Math.PI / 180);\n\n    ctx.drawImage(\n      transformedImage.image,\n      -transformedImage.size.width / 2,\n      -transformedImage.size.height / 2\n    );\n\n    const result: ImageCroppedEvent = {\n      width, height,\n      imagePosition,\n      cropperPosition: {...input.cropper}\n    };\n    if (input.options?.containWithinAspectRatio) {\n      result.offsetImagePosition = this.getOffsetImagePosition(input);\n    }\n    const resizeRatio = this.getResizeRatio(width, height, input.options);\n    if (resizeRatio !== 1) {\n      result.width = Math.round(width * resizeRatio);\n      result.height = input.options?.maintainAspectRatio\n        ? Math.round(result.width / (input.options?.aspectRatio ?? 1))\n        : Math.round(height * resizeRatio);\n      resizeCanvas(cropCanvas, result.width, result.height);\n    }\n    if (output === 'blob') {\n      return this.cropToBlob(result, cropCanvas, input);\n    } else {\n      result.base64 = cropCanvas.toDataURL('image/' + (input.options?.format ?? 'png'), this.getQuality(input.options));\n      return result;\n    }\n  }\n\n  private async cropToBlob(output: ImageCroppedEvent, cropCanvas: HTMLCanvasElement, input: CropInput): Promise<ImageCroppedEvent> {\n    output.blob = await new Promise<Blob | null>(resolve => cropCanvas.toBlob(resolve, 'image/' + (input.options?.format ?? 'png'), this.getQuality(input.options)));\n    if (output.blob) {\n      output.objectUrl = URL.createObjectURL(output.blob);\n    }\n    return output;\n  }\n\n  private getCanvasTranslate(input: CropInput): { translateH: number, translateV: number } {\n    if (input.transform?.translateUnit === 'px') {\n      const ratio = this.getRatio(input);\n      return {\n        translateH: (input.transform?.translateH || 0) * ratio,\n        translateV: (input.transform?.translateV || 0) * ratio\n      };\n    } else {\n      return {\n        translateH: input.transform?.translateH ? percentage(input.transform.translateH, input.loadedImage!.transformed.size.width) : 0,\n        translateV: input.transform?.translateV ? percentage(input.transform.translateV, input.loadedImage!.transformed.size.height) : 0\n      };\n    }\n  }\n\n  private getRatio(input: CropInput): number {\n    return input.loadedImage!.transformed.size.width / input.maxSize.width;\n  }\n\n  private getImagePosition(cropperState: CropInput): CropperPosition {\n    const ratio = this.getRatio(cropperState);\n    const x1 = Math.round(cropperState.cropper.x1 * ratio);\n    const y1 = Math.round(cropperState.cropper.y1 * ratio);\n    const out: CropperPosition = {\n      x1,\n      y1,\n      x2: x1 + Math.round((cropperState.cropper.x2 - cropperState.cropper.x1) * ratio),\n      y2: y1 + Math.round((cropperState.cropper.y2 - cropperState.cropper.y1) * ratio)\n    };\n\n    if (!cropperState.options?.containWithinAspectRatio) {\n      out.x1 = Math.max(out.x1, 0);\n      out.y1 = Math.max(out.y1, 0);\n      out.x2 = Math.min(out.x2, cropperState.loadedImage!.transformed.size.width);\n      out.y2 = Math.min(out.y2, cropperState.loadedImage!.transformed.size.height);\n    }\n\n    return out;\n  }\n\n  private getOffsetImagePosition(input: CropInput): CropperPosition {\n    const canvasRotation = (input.options?.canvasRotation ?? 0) + input.loadedImage!.exifTransform.rotate;\n    const ratio = this.getRatio(input);\n    let offsetX: number;\n    let offsetY: number;\n\n    if (canvasRotation % 2) {\n      offsetX = (input.loadedImage!.transformed.size.width - input.loadedImage!.original.size.height) / 2;\n      offsetY = (input.loadedImage!.transformed.size.height - input.loadedImage!.original.size.width) / 2;\n    } else {\n      offsetX = (input.loadedImage!.transformed.size.width - input.loadedImage!.original.size.width) / 2;\n      offsetY = (input.loadedImage!.transformed.size.height - input.loadedImage!.original.size.height) / 2;\n    }\n\n    const cropper = input.cropper;\n    const out: CropperPosition = {\n      x1: Math.round(cropper.x1 * ratio) - offsetX,\n      y1: Math.round(cropper.y1 * ratio) - offsetY,\n      x2: Math.round(cropper.x2 * ratio) - offsetX,\n      y2: Math.round(cropper.y2 * ratio) - offsetY\n    };\n\n    if (!input.options?.containWithinAspectRatio) {\n      out.x1 = Math.max(out.x1, 0);\n      out.y1 = Math.max(out.y1, 0);\n      out.x2 = Math.min(out.x2, input.loadedImage!.transformed.size.width);\n      out.y2 = Math.min(out.y2, input.loadedImage!.transformed.size.height);\n    }\n\n    return out;\n  }\n\n  getResizeRatio(width: number, height: number, options?: {\n    resizeToWidth?: number;\n    resizeToHeight?: number;\n    onlyScaleDown?: boolean;\n  }): number {\n    const ratios = new Array<number>();\n    if (options?.resizeToWidth && options.resizeToWidth > 0) {\n      ratios.push(options.resizeToWidth / width);\n    }\n    if (options?.resizeToHeight && options.resizeToHeight > 0) {\n      ratios.push(options.resizeToHeight / height);\n    }\n\n    const result = ratios.length === 0 ? 1 : Math.min(...ratios);\n\n    if (result > 1 && !options?.onlyScaleDown) {\n      return result;\n    }\n    return Math.min(result, 1);\n  }\n\n  getQuality(options?: { imageQuality?: number }): number {\n    return Math.min(1, Math.max(0, (options?.imageQuality ?? 92) / 100));\n  }\n}\n"]}