[Gtk-sharp-list] Strange Behaviour with Graphics.Clear and Graphics.DrawImage

[Aaron Radich]

Fixed.  The Render() method was being called direction when it should
have been queue up via the DrawingArea.QueueDraw()
method.
Aaron

> 
> 
> 
> I'm
seeing some strange behavior when debugging Graphics.Clear() and
>
Graphics.DrawImage() method calls in my Render() method code below. 
The
> first time Render is called it works fine.  The 2nd time the
call to
> Graphics.Clear caused the debugger to jump down X lines
to the
> "         g.DrawImage(rightImage, xr, yr);"
line.  When
> Graphics.DrawImage is called, the application is
then killed without an
> exception being raised.  Any idea what
might be going on? 
> "buffer" is defined as a
>
DrawingArea.
> Aaron
>
=======================================
> public
> void
Render()
> {
>    if (buffer.GdkWindow == null)
>
     
> return;
> 
>    // Init the placement
values
>    if (x == -1)
> 
>    {
>      
x = (sceneWidth / 2) - (centerImage.Width / 2);
>       y =
sceneHeight / 10;
>       yl = y;
>       yr = y;
>    }
> 
>    using (Graphics g =
>
Gtk.DotNet.Graphics.FromDrawable(buffer.GdkWindow, true))
>   
{
>       // the next statement works the first time Render() is
called, but
> the 2nd time it forces the debugger to
>
      // jump down do
> 'g.DrawImage(rightImage, xr, yr);', where
that statment then kills the
> application
>       // no
exception is raised
>      
> g.Clear(background);
>       // first draw the center image
>      
>
g.DrawImage(centerImage, x, y - centerGrowRate);
> 
>
      if
> (leftImage != null)
>       {
>
         // next we do the left
> one.
>          xl = x -
objectSeparation - leftImage.Width;
>         
g.DrawImage(leftImage, xl, yl);
>       }
> 
>
     
> if (rightImage != null)
>       {
>
         // finally the right
> one
>          xr = x +
objectSeparation +
> centerImage.Width;
>          // the
next line kills the application
> on the 2nd call to Render()
>          g.DrawImage(rightImage, xr,
> yr);
>      
}
>    } // using Graphics
> }
> 
>
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