Code example for Transformation

Methods: clear, getMatrix, setTransformationType

0
 
		final int childCenter = getCenterOfView(child);
		final int childWidth = child.getWidth();
		int rotationAngle = 0;
 
		t.clear();
		t.setTransformationType(Transformation.TYPE_MATRIX);
 
		if (childCenter == mCoveflowCenter) {
			transformImageBitmap((ImageView) child, t, 0);
		} 
		else { 
			rotationAngle = (int) (((float) (mCoveflowCenter - childCenter) / childWidth) * mMaxRotationAngle);
			if (Math.abs(rotationAngle) > mMaxRotationAngle) {
				rotationAngle = (rotationAngle < 0) ? -mMaxRotationAngle : mMaxRotationAngle;
			} 
			transformImageBitmap((ImageView) child, t, rotationAngle);
		} 
 
		return true; 
	} 
 
	/** 
	 * This is called during layout when the size of this view has changed. If 
	 * you were just added to the view hierarchy, you're called with the old 
	 * values of 0. 
	 *  
	 * @param w 
	 *            Current width of this view. 
	 * @param h 
	 *            Current height of this view. 
	 * @param oldw 
	 *            Old width of this view. 
	 * @param oldh 
	 *            Old height of this view. 
	 */ 
	protected void onSizeChanged(int w, int h, int oldw, int oldh) {
		mCoveflowCenter = getCenterOfCoverflow();
		super.onSizeChanged(w, h, oldw, oldh);
	} 
 
	/** 
	 * Transform the Image Bitmap by the Angle passed 
	 *  
	 * @param imageView 
	 *            ImageView the ImageView whose bitmap we want to rotate 
	 * @param t 
	 *            transformation 
	 * @param rotationAngle 
	 *            the Angle by which to rotate the Bitmap 
	 */ 
	private void transformImageBitmap(ImageView child, Transformation t, int rotationAngle) {
		mCamera.save();
		final Matrix imageMatrix = t.getMatrix();
		; 
		final int imageHeight = child.getLayoutParams().height;
		; 
		final int imageWidth = child.getLayoutParams().width;
		final int rotation = Math.abs(rotationAngle);