Hi
I’ve coded a scrolling routine in the simplest way:
I draw a grid of blocks (tiles) translated “ad hoc” to
simulate the movement. This routine works fine but it’s
not the best way to do a scrolling (Am I wrong?).
So I’m trying to make a delta-scrolling:
I scroll the screen graphics and then past only the
blocks on the borders of the screen (there is a great
increase of fps).
This technique worked fine on C++ and DX, but doesn’t
work on Java!
The problem could be in Graphics.copyArea() function…
When I scroll graphics to right (so the map is moving to left)
it scrolls fine, but when the graphics srolls to left,
the scrolling hangs after few pixels (about 64) and then
it scrolls one pixel after many millisec (randomly).
I can’t understand why it happens, is it a bug of Java?
I’m using JDK 1.4.0_01.
Another thing I’ve noticed is that if I replace the
call to copyArea() with an own made routine (using
drawImage) the result is the same!
So the problem is probably in the Java2D API…
Could anyone give me a solution?