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java.awt.Graphics and java.awt.Graphics2D

Victor M. Pereira
Ranch Hand

Joined: Mar 02, 2012
Posts: 50
Out of simple curiosity who implements the actual methods that draw? Since the draw(Shape S) from the java.awt.Graphics2D is an abstract method and I heven't been able to find something that implements logic to it.
I got curious!


regards,
Victor M. Pereira
Stephan van Hulst
Bartender

Joined: Sep 20, 2010
Posts: 3649
    
  17

Well, one thing you could do is try and track down the point where the actual Graphics instance is created. A point you can start is the source code of one of the JFrame.repaint() methods.
Victor M. Pereira
Ranch Hand

Joined: Mar 02, 2012
Posts: 50
Thanks I'll try that and post the result of the experiment. I only hope It doesn't end in the Java ByteCode.
Darryl Burke
Bartender

Joined: May 03, 2008
Posts: 4664
    
    5

All the interesting methods of concrete implementations of Graphics/2D are in native code, and the concrete classes themselves are (possibly platform-dependent) proprietary com.sun... classes. Do a sysout of getClass() in a painting method override and you can get the class name. No, you won't find the source of that class in src.zip.

If you're interested in the sequence of painting activities, look at RepaintManager.

The repaint() method merely queues a paint event in the EventQueue.


luck, db
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