[4576] in java-interest
missing functionality : drawImage != BitBlt/StretchBlt
daemon@ATHENA.MIT.EDU (Jonathan Locke)
Sun Jan 7 17:22:07 1996
Date: Sun, 7 Jan 1996 10:33:21 -0800 (PST)
From: Jonathan Locke <jonl@sealevelsoftware.com>
To: java <java-interest@java.sun.com>
ok, so i recently discovered i couldn't expose/InvalidateRect a rectangle
in my applet... so i decided to do all the damaged rectangle management
myself. i get all done with it and i'm ready to blt the updates of each
exposed area to the screen when i discover... you can't do it with AWT!
there don't seem to be enough parameters to draw image. with drawImage, your
destination is implicitly the Graphics you are using and you can specify the
x, y, width and height of your destination rectangle, *but* you can't specify
the subrectangle of the image you want to Blt. you have to Blt the whole
image or nothing at all. we need two new functions:
public abstract boolean Graphics.drawImage // Same as BitBlt
(
Image img, int xDest, int yDest, int widthDest, int heightDest,
int xSource, int ySource, ImageObserver observer
);
public abstract boolean Graphics.drawImage // Same as StretchBlt
(
Image img, int xDest, int yDest, int widthDest, int heightDest,
int xSource, int ySource, widthSource, widthDest, ImageObserver observer
);
and actually, it *might* be better if Image img was a Graphics instead.
i haven't thought too much about that part though.
J
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