[Jython-dev] Coercion or cast trouble with Jython and Swing...

[<rem...@fr...>]

Greetings,

I'm having troubles with type coercion / casting with java.awt.Graphics objects:
I want to use the drawPolygon() method but at runtime JPanel.getGraphics()
returns a sun.awt.windows.WGraphics and the Jython interpreter try to
cast it into a sun.java2d.SunGraphics2D. I never had such problems with Java. I
don't know what to do. Moving back to Java programming ? Jython is just so GREAT
! I can't go back to Java !!!

Remy Moueza

class JDisplay ( JPanel, MouseListener, MouseMotionListener ):
    ...

    def display_poly ( self, poly, screen ):
	...	
        x_values = []
        y_values = []

        for point in poly.points :
            x, y = screen.output ( point )
            x_values.append ( x )
            y_values.append ( y )

        gc = self.getGraphics ()
        print gc
        x_coord = array ( x_values, "i" )
        y_coord = array ( y_values, "i" )

        gc.drawPolygon ( x_coord, len( x_values ), y_coord, len( y_values ))


Here is the error message :
sun.awt.windows.WGraphics # -> print gc
Traceback (innermost last):
  File "C:\lecteurD\monDev\3Dmoteur\python\JAffichage.py", line 0, in main
  File "C:\lecteurD\monDev\3Dmoteur\python\JAffichage.py", line 0, in display
  File "C:\lecteurD\monDev\3Dmoteur\python\JAffichage.py", line 0, in
display_facette
TypeError: drawPolygon(): 1st arg can't be coerced to sun.java2d.SunGraphics2D