public static void prepareMatrix(
android.graphics.Matrix matrix, boolean mirror, int viewWidth, int viewHeight) {
// This is the value for android.hardware.Camera.setDisplayOrientation.
// Camera driver coordinates range from (-1000, -1000) to (1000, 1000).
// UI coordinates range from (0, 0) to (width, height).
matrix.postScale(viewWidth / 2000f, viewHeight / 2000f);
matrix.postTranslate(viewWidth / 2f, viewHeight / 2f);
}
@Override
public void onFaceDetection(Camera.Face[] faces, Camera camera) {
RectF rectf = new RectF();
for (Camera.Face face : faces) {
int centerX = face.rect.centerX();
int centerY = face.rect.centerY();
android.graphics.Matrix matrix = new android.graphics.Matrix();
// Width needs to be divided by 2 because the overlay is for both eyes:
prepareMatrix(matrix, false, mOverlayView.getWidth() / 2, mOverlayView.getHeight());
rectf.set(face.rect);
matrix.mapRect(rectf);
mOverlayView.show3DRect((int) rectf.centerX(), (int) rectf.centerY());
mOverlayView.show3DToast("Found face! x = " + rectf.centerX() + ", y = " + rectf.centerY());
}
}