can't get my coordinates graphics2D mouseclick java

Question

I got an extended JLabel class where I draw my Map using the code below : the new AffineTransform() is the identity to left my image as it is (0,0,w,h)

Answer 1

I found these:

• http://www.javalobby.org/java/forums/t19387.html
• http://www.java.net/node/685054

Don't know if they will help or not.

Answer 2

Its not so hard ;-)

1. When you repaint the Component save the AffineTransform after the transforming with g2.getTransform()

2. Then call the function invert() on it

3. In the mouseClicked() event us the following code:

   Point2D p= trans.transform(new Point2D.Double(evt.getX(), evt.getY()), null);
   System.out.println("click x="+p.getX()+" y="+p.getY());
   

Thats it!

Answer 3

It sounds like you need both a forward and inverse transform to translate between the two co-ordinate systems. In this example, the scaling equations are explicit; in this alternate approach, a second AffineTransform is used.