我正在开发一款基于摄像头的应用程序,在摄像头上放置一个矩形视图。当我使用
现在我实现了
因此,我需要捕捉用户最终选择的图像,即他们放置矩形的位置。具体效果如下图所示:
这是我用来裁剪图像的方法。数值被硬编码以找到确切的位置。 现在,我需要随着矩形变化而获得 top、bottom、height 和 width 的数值。
//我的自定义视图用于绘制该矩形
new Camera.PictureCallback()
拍摄一张照片时,我会裁剪该图像,以便它只包含矩形部分。目前这个功能已经正常工作。现在我实现了
View.OnTouchListener
并将其用于使该形状可移动。因此,我需要捕捉用户最终选择的图像,即他们放置矩形的位置。具体效果如下图所示:
![This is how it looks](https://istack.dev59.com/gSolU.webp)
Bitmap imageOriginal = BitmapFactory.decodeByteArray(data, 0, data.length); // 2560×1440
float scale = 1280 / 1000;
int left = (int) (scale * (imageOriginal.getWidth() - 250) / 2);
int top = (int) (scale * (imageOriginal.getHeight() - 616) / 2);
int width = (int) (scale * 750);
int height = (int) (scale * 616);
Bitmap imageConverted = Bitmap.createBitmap(imageOriginal, left, top, width, height, null, false);
这是我用来裁剪图像的方法。数值被硬编码以找到确切的位置。 现在,我需要随着矩形变化而获得 top、bottom、height 和 width 的数值。
//我的自定义视图用于绘制该矩形
public class CustomView extends View {
private Paint paint = new Paint();
public CustomView(Context context) {
super(context);
}
@Override
protected void onDraw(Canvas canvas) { // Override the onDraw() Method
super.onDraw(canvas);
paint.setStyle(Paint.Style.STROKE);
paint.setColor(Color.GREEN);
paint.setStrokeWidth(10);
//center
int x0 = canvas.getWidth()/2;
int y0 = canvas.getHeight()/2;
int dx = canvas.getHeight()/3;
int dy = canvas.getHeight()/3;
//draw guide box
canvas.drawRect(x0-dx, y0-dy, x0+dx, y0+dy, paint);
}
}
//我的图片回调代码
Camera.PictureCallback mPicture = new Camera.PictureCallback() {
public void onPictureTaken(byte[] data, Camera camera) {
// Replacing the button after a photho was taken.
// File name of the image that we just took.
fileName = "IMG_" + new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date()).toString() + ".jpg";
// Creating the directory where to save the image. Sadly in older
// version of Android we can not get the Media catalog name
File mkDir = new File(sdRoot, dir);
mkDir.mkdirs();
// Main file where to save the data that we recive from the camera
File pictureFile = new File(sdRoot, dir + fileName);
// Cropping image with the corresponding co-ordinates and save in to a file
try {
Bitmap imageOriginal = BitmapFactory.decodeByteArray(data, 0, data.length); // 2560×1440
float scale = 1280 / 1000;
int left = (int) (scale * (imageOriginal.getWidth() - 250) / 2);
int top = (int) (scale * (imageOriginal.getHeight() - 616) / 2);
int width = (int) (scale * 750);
int height = (int) (scale * 616);
Bitmap imageConverted = Bitmap.createBitmap(imageOriginal, left, top, width, height, null, false);
FileOutputStream purge = new FileOutputStream(pictureFile);
imageConverted.compress(Bitmap.CompressFormat.JPEG, 100, purge);
purge.flush();
purge.close();
} catch (FileNotFoundException e) {
Log.d("DG_DEBUG", "File not found: " + e.getMessage());
} catch (IOException e) {
Log.d("DG_DEBUG", "Error accessing file: " + e.getMessage());
}
// Adding Exif data for the orientation.
try {
ProjectManager.getInstance().settings.IMAGE_LOCATION = "/sdcard/" + dir + fileName;
exif = new ExifInterface(ProjectManager.getInstance().settings.IMAGE_LOCATION);
exif.setAttribute(ExifInterface.TAG_ORIENTATION, "" + orientation);
exif.saveAttributes();
mView.saveImage(dir + fileName);
} catch (IOException e) {
e.printStackTrace();
}
}
};