鸿蒙媒体开发【拼图】拍照和图片

爱桥代码的程序媛2024-08-04 14:35

拼图

介绍

该示例通过@ohos.multimedia.image和@ohos.file.photoAccessHelper接口实现获取图片，以及图片裁剪分割的功能。

效果预览

使用说明：

  1. 使用预置相机拍照后启动应用，应用首页会读取设备内的图片文件并展示获取到的第一个图片，没有图片时图片位置显示空白；
  2. 点击开始按钮开始后，时间开始倒计时，在规定时间内未完成拼图则游戏结束。在游戏中，玩家点击重新开始进行游戏重置；
  3. 点击开始游戏后，玩家可以根据上方的大图，点击黄格周围的图片移动，点击后图片和黄格交换位置,最终拼成完整的图片；
  4. 不在游戏中时，玩家可以点击上方大图，选择自定义图片来进行拼图游戏。

具体实现

  • 游戏中图片裁剪分割的效果实现在ImageModel中，源码参考[ImageModel]:

    /*

    • Copyright (c) 2022 Huawei Device Co., Ltd.
    • Licensed under the Apache License, Version 2.0 (the "License");
    • you may not use this file except in compliance with the License.
    • You may obtain a copy of the License at
    • http://www.apache.org/licenses/LICENSE-2.0
    • Unless required by applicable law or agreed to in writing, software
    • distributed under the License is distributed on an "AS IS" BASIS,
    • WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    • See the License for the specific language governing permissions and
    • limitations under the License.
      */

    import { image } from '@kit.ImageKit';
    import { photoAccessHelper } from '@kit.MediaLibraryKit';
    import { dataSharePredicates } from '@kit.ArkData';
    import { Context } from '@kit.AbilityKit';
    import { fileIo } from '@kit.CoreFileKit';
    import Logger from './Logger';
    import PictureItem from './PictureItem';
    import { CommonConstants as Common } from '../common/CommonConstants';

    const TAG = '[ImageModel]';

    export default class ImageModel {
    private phAccessHelper: photoAccessHelper.PhotoAccessHelper | null = null;

    constructor(context: Context) {
  this.phAccessHelper = photoAccessHelper.getPhotoAccessHelper(context);
}

async getAllImg(): Promise<photoAccessHelper.PhotoAsset[]> {
  Logger.info('getAllImg');
  let photoList: Array<photoAccessHelper.PhotoAsset> = [];
  if (this.phAccessHelper === null) {
    Logger.info('phAccessHelper fail');
    return photoList;
  }
  let fileKeyType = photoAccessHelper.PhotoKeys.PHOTO_TYPE;
  let predicates: dataSharePredicates.DataSharePredicates = new dataSharePredicates.DataSharePredicates();
  Logger.info(fileKeyType);
  let fetchOptions: photoAccessHelper.FetchOptions = {
    fetchColumns: [],
    predicates: predicates
  };

  try {
    let fetchResult: photoAccessHelper.FetchResult<photoAccessHelper.PhotoAsset> =
      await this.phAccessHelper.getAssets(fetchOptions);
    if (fetchResult != undefined) {
      Logger.info('fetchResult success');
      let photoAsset: Array<photoAccessHelper.PhotoAsset> = await fetchResult.getAllObjects();
      if (photoAsset != undefined && photoAsset.length > 0) {
        for (let i = 0; i < photoAsset.length; i++) {
          if (photoAsset[i].photoType === 1) {
            photoList.push(photoAsset[i]);
          }
        }
      }
    }
  } catch (err) {
    Logger.error('getAssets failed, message = ', err);
  }
  Logger.info('photoList success');
  return photoList;
}

async splitPic(index: number): Promise<PictureItem[]> {
  let imagePixelMap: PictureItem[] = [];
  let imagesData: Array<photoAccessHelper.PhotoAsset> = await this.getAllImg();
  let imagePackerApi = image.createImagePacker();
  fileIo.open(imagesData[index].uri, fileIo.OpenMode.READ_ONLY).then(async (file: fileIo.File) => {
    let fd: number = file.fd;
    let imageSource = image.createImageSource(fd);
    let imageInfo = await imageSource.getImageInfo();
    Logger.info(TAG, `sizeImg createImageSource ${JSON.stringify(imageSource)}`);
    let height = imageInfo.size.height / Common.SPLIT_COUNT;
    for (let i = 0; i < Common.SPLIT_COUNT; i++) {
      for (let j = 0; j < Common.SPLIT_COUNT; j++) {
        let picItem: PictureItem;
        if (i === Common.SPLIT_COUNT - 1 && j === Common.SPLIT_COUNT - 1) {
          picItem = new PictureItem(Common.PICTURE_ITEM_NUMBER, {} as image.PixelMap);
          imagePixelMap.push(picItem);
        } else {
          Logger.info(TAG, `sizeImg x = ${imageInfo.size.width / Common.SPLIT_COUNT} y = ${height}`);
          let decodingOptions: image.DecodingOptions = {
            desiredRegion: {
              size: {
                height: height,
                width: imageInfo.size.width / Common.SPLIT_COUNT
              }, x: j * imageInfo.size.width / Common.SPLIT_COUNT, y: i * height
            }
          }
          imagePixelMap.push(
            new PictureItem(i * Common.SPLIT_COUNT + j, await imageSource.createPixelMap(decodingOptions)));
        }
      }
    }
    imagePackerApi.release();
    fileIo.closeSync(fd);
  })
  return imagePixelMap;
}

    }

  • 获取本地图片：首先使用getPhotoAccessHelper获取相册管理模块实例，然后使用getAssets方法获取文件资源，最后使用getAllObjects获取检索结果中的所有文件资产方便展示；

  • 裁剪图片准备：裁剪图片需要使用@ohos.multimedia.image接口，裁剪前需要申请图片编辑权限，使用requestPermissionsFromUser申请，源码参考[Index.ets];

    /*

    • Copyright (c) 2022-2023 Huawei Device Co., Ltd.
    • Licensed under the Apache License, Version 2.0 (the "License");
    • you may not use this file except in compliance with the License.
    • You may obtain a copy of the License at
    • http://www.apache.org/licenses/LICENSE-2.0
    • Unless required by applicable law or agreed to in writing, software
    • distributed under the License is distributed on an "AS IS" BASIS,
    • WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    • See the License for the specific language governing permissions and
    • limitations under the License.
      */

    import { mediaquery } from '@kit.ArkUI';
    import { Permissions, abilityAccessCtrl } from '@kit.AbilityKit';
    import { emitter } from '@kit.BasicServicesKit';
    import { photoAccessHelper } from '@kit.MediaLibraryKit';
    import GameRules from '../model/GameRules';
    import ImagePicker from '../common/ImagePicker';
    import Logger from '../model/Logger';
    import PictureItem from '../model/PictureItem';
    import ImageModel from '../model/ImageModel';
    import { CommonConstants as Common } from '../common/CommonConstants';

    const PERMISSIONS: Array<Permissions> = [
    'ohos.permission.READ_MEDIA',
    'ohos.permission.WRITE_MEDIA',
    'ohos.permission.MEDIA_LOCATION',
    'ohos.permission.MANAGE_MISSIONS'
    ];

    @Entry
    @Component
    struct Index {
    @State numArray: PictureItem[] = [];
    @State imgData: Array<photoAccessHelper.PhotoAsset> = [];
    @State @Watch('onTimeOver') gameTime: number = Common.GAME_TIME;
    @State @Watch('onImageChange') index: number = Common.ZERO;
    @State isLand: boolean = false;
    @StorageLink('isGameStart') isGameStart: boolean = false;
    private listener = mediaquery.matchMediaSync('screen and (min-aspect-ratio: 1.5) or (orientation: landscape)');
    private ImageModel: ImageModel = new ImageModel(getContext(this));
    private game: GameRules = new GameRules();
    private timer: number = -1;
    private isRefresh: boolean = false;

    onLand = (mediaQueryResult: mediaquery.MediaQueryResult) => {
  Logger.info(`[eTSMediaQuery.Index]onLand: mediaQueryResult.matches=${mediaQueryResult.matches}`);
  this.isLand = mediaQueryResult.matches;
};
over = () => {
  Logger.info(Common.TAG, 'emitter on , eventID = 0');
  for (let i = Common.ZERO; i < Common.LOOP; i++) {
    this.numArray[i].index = i;
  }
  this.gameOver();
};
timeEnd = () => {
  Logger.info(Common.TAG, 'emitter on , eventID = 1');
  this.gameTime = Common.ZERO;
};

async aboutToAppear() {
  this.listener.on('change', this.onLand);
  await abilityAccessCtrl.createAtManager().requestPermissionsFromUser(getContext(this), PERMISSIONS);
  this.imgData = await this.ImageModel.getAllImg();
  Logger.info(Common.TAG, `images = ${this.imgData.length}`);
  this.numArray = await this.ImageModel.splitPic(this.index);
  // Test case. The game is simulated successfully.
  emitter.on({ eventId: Common.ZERO, priority: Common.ZERO }, this.over);
  // Test case. End of simulation time.
  emitter.on({ eventId: Common.ONE, priority: Common.ZERO }, this.timeEnd);
}

onTimeOver() {
  if (this.gameTime === Common.ZERO) {
    this.isGameStart = false;
    AlertDialog.show({ message: 'TimeOver' });
    clearInterval(this.timer);
  }
}

async onImageChange() {
  this.isRefresh = true;
  this.dialogController.close();
  this.numArray = [];
  this.numArray = await this.ImageModel.splitPic(this.index);
  this.init();
  this.isGameStart = false;
  this.isRefresh = false;
}

init() {
  this.gameTime = Common.GAME_TIME;
  clearInterval(this.timer);
}

gameOver() {
  let count = Common.ZERO;
  for (let i = Common.ZERO; i < Common.LOOP; i++) {
    if (this.numArray[i].index === i) {
      count++;
    } else {
      count = Common.ZERO;
      break;
    }
  }
  if (count === Common.LOOP) {
    this.isGameStart = false;
    AlertDialog.show({ message: $r('app.string.congratulations') });
    clearInterval(this.timer);
    this.gameTime = Common.GAME_TIME;
  }
}

start() {
  this.init();
  this.timer = setInterval(() => {
    this.gameTime--;
  }, Common.TIME_NUMBER)
}

dialogController: CustomDialogController = new CustomDialogController({
  builder: ImagePicker({
    imagesData: this.imgData,
    index: $index
  }),
  autoCancel: true,
  gridCount: Common.GRID_COUNT
})

@Builder
ImageShow() {
  Image(this.imgData[this.index].uri)
    .id(Common.IMAGE_SHOW)
    .width(Common.IMAGE_WIDTH)
    .height($r('app.float.imageShow_height'))
    .objectFit(ImageFit.Fill)
    .onClick(async () => {
      if (this.isRefresh) {
        return;
      }
      this.imgData = await this.ImageModel.getAllImg();
      setTimeout(() => {
        this.dialogController.open();
      }, Common.TIME);
    })
}

@Builder
ImageGrid(leftMargin: number, topMargin: number) {
  Grid() {
    ForEach(this.numArray, (item: PictureItem, index) => {
      GridItem() {
        Image(item.pixelMap)
          .width(Common.GRID_IMAGE_WIDTH)
          .objectFit(ImageFit.Fill)
          .height($r('app.float.grid_image_height'))
      }
      .id(`image${index}`)
      .backgroundColor(item.pixelMap === undefined ? $r('app.color.blank_picture_background') : $r('app.color.picture_background'))
      .onClick(() => {
        if (this.isRefresh) {
          return;
        }
        if (this.isGameStart) {
          this.isRefresh = true;
          this.numArray = this.game.gameInit(index, this.numArray);
          this.gameOver();
          this.isRefresh = false;
        }
      })
    }, (item: PictureItem) => JSON.stringify(item))
  }
  .id(Common.IMAGE_GRID)
  .columnsTemplate(Common.COLUMN_TEMPLATE)
  .columnsGap($r('app.float.gap'))
  .rowsGap($r('app.float.gap'))
  .width(Common.IMAGE_WIDTH)
  .height($r('app.float.grid_height'))
  .margin({ left: leftMargin, top: topMargin })
}

build() {
  Column() {
    Row() {
      Text(`Time:0${Math.floor(this.gameTime / Common.SECOND)}:${this.gameTime % Common.SECOND < Common.TEN
        ? Common.STRING_ZERO + this.gameTime % Common.SECOND : this.gameTime % Common.SECOND}`)
        .id(Common.TIME_STRING)
        .margin({ top: Common.MARGIN, bottom: Common.MARGIN })
    }

    if (this.imgData.length > Common.ZERO) {
      if (this.isLand) {
        Row() {
          this.ImageShow()
          this.ImageGrid(Common.TEN, Common.ZERO)
        }
        .margin({ top: Common.MARGIN })
      } else {
        Column() {
          this.ImageShow()
          this.ImageGrid(Common.ZERO, Common.FIVE)
        }
        .margin({ top: Common.MARGIN })
      }
    }
    Button($r('app.string.start'), { type: ButtonType.Capsule, stateEffect: true })
      .id(Common.START_BUTTON)
      .height($r('app.float.button_height'))
      .width(Common.FULL_WIDTH)
      .fontSize($r('app.float.button_font_size'))
      .margin({ top: Common.MARGIN })
      .backgroundColor(this.isGameStart ? $r('app.color.forbid') : $r('app.color.allow'))
      .enabled(!this.isGameStart)
      .onClick(() => {
        this.isGameStart = true;
        this.start();
        this.numArray = this.game.gameBegin(this.numArray);
      })

    Button($r('app.string.restart'), { type: ButtonType.Capsule, stateEffect: true })
      .id(Common.RESTART_BUTTON)
      .height($r('app.float.button_height'))
      .width(Common.FULL_WIDTH)
      .fontSize($r('app.float.button_font_size'))
      .margin({ top: Common.MARGIN })
      .backgroundColor(this.isGameStart ? $r('app.color.allow') : $r('app.color.forbid'))
      .enabled(this.isGameStart)
      .onClick(() => {
        this.isGameStart = true;
        this.start();
        this.numArray = this.game.gameBegin(this.numArray);
      })
  }
  .width(Common.FULL_WIDTH)
  .height(Common.FULL_HEIGHT)
  .padding({ left: Common.PERCENT, right: Common.PERCENT })
}

    }

  • 图片编辑：首先使用createImagePacker创建ImagePacker实例，然后使用fs.open打开文件，调用createImageSource接口创建图片源实例方便操作图片，接下来使用getImageInfo方法获取图片大小便于分割，最后使用createPixelMap方法传入每一份的尺寸参数完成图片裁剪。

以上就是本篇文章所带来的鸿蒙开发中一小部分技术讲解；想要学习完整的鸿蒙全栈技术。可以在结尾找我可全部拿到！

下面是鸿蒙的完整学习路线 ，展示如下：

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鸿蒙【北向应用开发+南向系统层开发】文档

鸿蒙【基础+实战项目】视频

鸿蒙面经

为了避免大家在学习过程中产生更多的时间成本，对比我把以上内容全部放在了↓↓↓想要的可以自拿喔！谢谢大家观看！

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