change image shape in android

Question

I got success in implementing a pinch zoom in/out and drag/drop functionality in images on the canvas.

Now what I want is re-sizing, that images like below link that based on iPhone App

How to change shape of an image using iPhone SDK?

So how can I achieve that kind of functionality in Android ?

Answer 1

Basically you need to invalidate the image and re-draw on the canvas from the beginning ::

img=(ImageView)findViewById(R.id.yourimageidfromxml);

img.onTouchEvent(MotionEvent me)
{
   int X=me.getX(); 
   int Y=me.getY();
   img.invalidate();
   img.repaint(X,Y);

}

void paint(int X,int Y)
{
  img.setWidth(X);
  img.setHeight(Y);
}

Scaling image will transform using repaint on canvas from the beginning

Answer 2

If by re-sizing you are referring to "stretching" the Bitmap on the vertical and horizontal plane then you simply modify the rect that the shape (eg. oval) is being drawn into.

For example:

This is your original shape of an oval:

canvas.drawOval(new Rect(0,0,100,100), bluePaint);

This is the same oval, just stretched (resized) on the horizontal plane:

canvas.drawOval(new Rect(0,0,200,100), bluePaint);

I hope this helps.