鸿蒙开源第三方组件——图片裁剪组件ohos-Image-Cropper

CropImage.activity()  //初始化CropImage类         
    .setContext(this)//设置上下文      
    .setSource(ResourceTable.Media_baochi)//传入被裁减图片的ID          
    .setBundleName("com.huawei.mytestproject")//传入包名         
    .setAbilityName("com.huawei.mytestproject.MainAbility")//传入类名         
    .setRequset_code(1234)//请求参数设置         
    .start(super.getAbility(),this);//启动跳转

//裁剪方法
private void crop(Intent intentOriginal) {
    …
    Intent intent = new Intent();
    ...
    Operation operation = new Intent.OperationBuilder()
        .withDeviceId("")
        //指定图片裁剪后返回的Ability包名和类名
        .withBundleName(intentOriginal.getStringParam("bundleName")) 
        .withAbilityName(intentOriginal.getStringParam("abilityName"))
        .build();
    intent.setOperation(operation);// 把operation设置到intent中
    startAbility(intent);//跳转方法
}

CropImage.handleImage(int result_code , Component image);

int result_code = result.getIntParam("result_code" , 0);

PixelMap croppedPixelMap = CropImage.getCroppedPixelMap();

//实例化一个资源选项类
ImageSource.SourceOptions options = new ImageSource.SourceOptions();
//选择解码jpg图片
options.formatHint = "image/jpg";
//实例化一个解码选项
ImageSource.DecodingOptions decodingOptions = new ImageSource.DecodingOptions(); 
//设置解码后的位图为可以编辑
decodingOptions.editable = true;
//解码选项可以传入一个矩形，如果不传，默认解码完整的图片
//decodingOptions.desiredRegion = new Rect(0 , 0 , 100 , 100);
try { 
    Resource asset = assetManager.openRawFile();
    //图片资源 
    ImageSource source = ImageSource.create(asset, options);
    //返回解码后的位图 
    return 
    Optional.ofNullable(source.createPixelmap(decodingOptions)).get();
}...

//解码
try {
    Resource asset = assetManager.openRawFile();
    ImageSource source = ImageSource.create(asset, options);
    //返回解码后的位图
    return Optional.ofNullable(source.createPixelmap(decodingOptions)).get();
} catch (IOException e) {
    e.printStackTrace();
}
return Optional.empty();

//滑动监听
public void setSlideListener() {    
    //初始化滑动监听     
    mCropBound.setTouchEventListener(new Component.TouchEventListener() {        
        //创建一个RectFloat用来记录滑动之后的位置        
        RectFloat mScrolledClipBoundRect;        
        @Override        
        public boolean onTouchEvent(Component component, TouchEvent touchEvent) {            
            //获得当前手指点击位置，此位置为相对于整个屏幕的坐标，屏幕左上角x=0，y=0
            MmiPoint position = touchEvent.getPointerPosition(0);            
            float x = position.getX();            
            float y = position.getY();
            //获得当前裁剪框的宽和高       
            float width = getCropBoundWidth();            
            float height = getCropBoundHeight();            
            //获得当前图片的位置，图片所在的上下左右边的位置     
            int left = mBitmapUtils.getPositionLeft();            
            int top = mBitmapUtils.getPositionTop();            
            int right = mBitmapUtils.getPositionRight();            
            int bottom = mBitmapUtils.getPositionBottom();            
            //获得裁剪框位置，裁剪框所在的上下左右边的位置     
            float cropBoundLeft = mCropRect.left;            
            float cropBoundTop = mCropRect.top;            
            float cropBoundRight = mCropRect.right;            
            float cropBoundBottom = mCropRect.bottom;        
            //判断裁剪框的位置，裁剪框不能超过图片的边界       
            if ((right > (x + width / 2)) && ((x - width / 2) > left) && (bottom > (y + height / 2)) && ((y - height / 2) > top)){
                //判断裁剪框的位置，点击事件必须在裁剪框内才可以移动裁剪框                
                if((cropBoundRight - width/10 > x) && (x > cropBoundLeft + width/10) && (cropBoundBottom - height/10> y) && (y > cropBoundTop + height/10)){
                    //记录新的裁剪框的位置信息                    
                    mScrolledClipBoundRect = new RectFloat(x - width / 2.0f, y - height / 2.0f, x + width / 2.0f, y + height / 2.0f);
                    //更新裁剪框                    
                    updateClipBound(mCropBound, mScrolledClipBoundRect);                
                    //更新记录裁剪框位置信息的矩形                    
                    mCropRect = mScrolledClipBoundRect;                    
                    return false;              
                }            
            }            
            return false;        
        }    
    });
}

private void rotate(Canvas canvas){     
    //以图片中心为旋转中心，旋转90度    
    canvas.rotate(90, mCropWindowHandler.getWindowWidth()/2, mCropWindowHandler.getWindowWidth()/2);
}

//水平翻转方法（Canvas倒序执行）
private void horizontalFilp(Canvas canvas){    
    canvas.save();    
    //向x轴正方向移动    
    canvas.translate(mCropWindowHandler.getWindowWidth() , 0);    
    //向x轴负方向缩放一倍    
    canvas.scale(-1f , 1f);
}

//竖直翻转方法（Canvas倒序执行） 
private void verticalFilp(Canvas canvas){     
    canvas.save();    
    //向y轴正方向移动     
    canvas.translate(0 , mCropWindowHandler.getWindowWidth());     
    //向y轴负方向缩放一倍     
    canvas.scale(1f , -1f);
}