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ngx-image-cropper

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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 out = { x1: Math.round(cropperState.cropper.x1 * ratio), y1: Math.round(cropperState.cropper.y1 * ratio), x2: Math.round(cropperState.cropper.x2 * ratio), y2: Math.round(cropperState.cropper.y2 * 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 out: CropperPosition = {\n      x1: Math.round(cropperState.cropper.x1 * ratio),\n      y1: Math.round(cropperState.cropper.y1 * ratio),\n      x2: Math.round(cropperState.cropper.x2 * ratio),\n      y2: Math.round(cropperState.cropper.y2 * 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"]}