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  maybe simple problem (translate)  (Read 719 times)
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Offline BrainPain

Senior Newbie




Java games rock!


« Posted 2005-04-15 15:42:00 »

hello,

i tried to translate this way:

public void paint(graphics g){
 g.translate(-x,-y)
 // paint something
 g.translate(x,y)
}

the first translate seems to work perfect but later the origin of the graphics is somewhere in the middle.

By the Way:
I'm changing x,y with a MouseListener and i'm using a thread for calling paint().

but why is the origin wrong? i'm translating and translating back so how can the origin change?

Greetz
Offline Valodim

Junior Member




*sigh*


« Reply #1 - Posted 2005-04-15 16:41:48 »

maybe x,y changes (-> the mouse is moved) during the execution of paint()?
Offline weston

Junior Member





« Reply #2 - Posted 2005-04-15 17:20:04 »

you doing any other transforms (scale/rotate) in the:
// paint somthing
area?

for(int i = 1; i > 0; i++)
{
System.out.println(i+" cups of java downed");
}
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Offline BrainPain

Senior Newbie




Java games rock!


« Reply #3 - Posted 2005-04-16 17:40:05 »

no, i'm only painting in the //painting area.
but in the future i want to scale the graphics
in the same way like translate. scaling only
works perfect but without the translate it
is senseless (i want to implement a mouse-zoom)
Offline BrainPain

Senior Newbie




Java games rock!


« Reply #4 - Posted 2005-04-16 20:31:22 »

valodim was right.  Smiley
x,y changed during execution of paint().
i have fix it with storing x,y in temporary
variables at the beginning of paint() and
using the temporary variables for the painting.

now it looks like this:
public void paint(Graphics g){
 int tempX=TranslationX;
 int tempY=TranslationY;

 g2d.translate(-tempX,-tempY);
 // paint something
 g.translate(tempX,tempY);
}

Thanks
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