I first thought this was a bug in the 1.6.0.14 plugin. But perhaps it is just
that the Graphics2D object retrieved from a Canvas object is volatile.
Although I have never seen a Graphics2D object to be volatile except when it
was retrieved from a BufferStrategy.
This is what I see.
When I dragged an applet to the desktop, I would lose my Canvas Graphics2D
object. In other words when I init my Canvas:
canvasGraphic = (Graphics2D)this.getGraphics(); // this is a Canvas
gives me back a volitile canvasGraphic. When I drag the applet to the desktop,
canvasGraphics is no longer valid. It's not null -- just not valid. I cannot
use it to draw with. The applet still responds to paint(Graphics g) calls
because g is a new Graphics object.
So when I redraw my pixel buffer, I have to get the canvasGraphics object each
time to be sure that it is still valid like this:
I call this method now for every frame I draw when the user pans/tilts/zooms.
public void newPixels()
{
canvasGraphic= (Graphics2D)this.getGraphics();
canvasGraphic.drawImage(paintImage, 0, 0, thisW, thisH, this);
}
It used to look like:
public void newPixels()
{
canvasGraphic.drawImage(paintImage, 0, 0, thisW, thisH, this);
}
And the above works fine until the applet is dragged to the desktop, then
canvasGraphic becomes invalid (or something) and drawImage() doesn't draw the
image on the Canvas.
Is this a bug??? Is this the way it's supposed to be??? I don't know.
Open:
http://pancyl.com/
I've added the code to get a new Graphics2D object each time I draw my pixel
buffer. It works now just like before 1.6.0.14. I don't recall ever having to
do this. But I was using BufferStrategy and I was getting the Graphics2D
object each time I drew. I changed to using an unmanaged BufferedImage that I
draw directly onto my Canvas. I didn't know that the Canvas graphics object
was volatile. I don't recall ever having to get the graphics object from the
Canvas each time I draw into it. Did something change?
[Message sent by forum member 'demonduck' (demonduck)]
http://forums.java.net/jive/thread.jspa?messageID=353271
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