Question

I have an Image and I’m able to draw a rectangle on the image like this:

Rectangle rect = new Rectangle(x,y,width,height);
graphics2D.draw(rect);

Then I rotate the Image and the drawn rectangle also rotates as expected. But now how can I get a reference to the newly rotated Rectangle? I need the properties of the rotated Rectangle like Point, width, height….

I don’s see that Graphics2D has a method like getShape()? Also, the rectangle passed to the Graphics2D when calling its draw(Rectangle) method doesn’t change.

Any ideas?

Answer 1

You can do it using AffineTransform class.

AffineTransform transform = new AffineTransform();
transform.rotate(Math.PI/2);
Shape transformed = transform.createTransformedShape(shape);

But it would yield you only the shape, which you can use for drawing. If you need exact points of rotated rectangle, you’ll need to transform each point separately:

transform.transform(point_before, point_after);