HarmonyOS 鸿蒙Next 有没有选好的图片返回后直接进行裁剪然后保存到私有目录下的函数

可以使用ImageKnife，它是基于OpenHarmony的图片处理三方库，可以定义裁剪效果。 三方库链接：https://gitee.com/openharmony-tpc/ImageKnife 也可以参考：https://developer.huawei.com/consumer/cn/codelabsPortal/carddetails/tutorials_NEXT-ImageEdit

import { BusinessError } from '@ohos.base';

import image from '@ohos.multimedia.image';

import fs from '@ohos.file.fs';

let path: string = getContext().filesDir + "/hehe.jpg";

let decodingOptions: image.DecodingOptions = {

  editable: true,

  desiredPixelFormat: 3,

}

@Entry

@Component

struct Index {

  @State pixelMap: PixelMap | undefined = undefined;

  @State pixelMap2: PixelMap | undefined = undefined;

  /**

   * 初始化图片资源到沙箱

   * @returns

   */

  async aboutToAppear(): Promise<void> {

    const resourceManager = getContext(this).resourceManager

    const imageArray = await resourceManager.getMediaContent($r('app.media.123')); // 换成自己的图片

    let file = fs.openSync(path, fs.OpenMode.READ_WRITE | fs.OpenMode.CREATE);

    fs.write(file.fd, imageArray.buffer).then((writeLen) => {

      console.info("write data to file succeed and size is:" + writeLen);

      fs.closeSync(file);

    }).catch((err: BusinessError) => {

      console.info("write data to file failed with error message: " + err.message + ", error code: " + err.code);

    });

  }

  /**

   * @param px

   * @param targetWidth

   * @param targetHeight

   */

  async packingDetail(targetWidth: number, targetHeight: number) {

    if (this.pixelMap) {

      let imageInfo = await this.pixelMap.getImageInfo();

      //计算压缩比

      let scaleX: number = targetWidth / imageInfo.size.width;

      let scaleY: number = targetHeight / imageInfo.size.height;

      this.pixelMap.scaleSync(scaleX, scaleY)

    }

  }

  build() {

    Row() {

      Column() {

        Image(this.pixelMap)

          .width(200)

          .height(200)

          .backgroundColor(Color.Red)

          .margin({ bottom: 40 })

          .objectFit(ImageFit.Contain)

        Button('1:3').onClick(async () => {

          // path为已获得的沙箱路径

          const imageSource: image.ImageSource = image.createImageSource(path);

          //创建pixelMap

          this.pixelMap = await imageSource.createPixelMap(decodingOptions);

          //指定压缩宽、高

          this.packingDetail(100, 300)

        }).margin({bottom: 20})

        Button('1:2').onClick(async () => {

          // path为已获得的沙箱路径

          const imageSource: image.ImageSource = image.createImageSource(path);

          //创建pixelMap

          this.pixelMap = await imageSource.createPixelMap(decodingOptions);

          //指定压缩宽、高

          this.packingDetail(100, 200)

        })

      }

      .width('100%')

    }

    .height('100%')

  }

}