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Index › Programming Questions & Help › Programs › Depth and Overpaint
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Depth and Overpaint (Read 525 times)
stefan.veen
Depth and Overpaint
Apr 24th, 2006, 2:46pm  
hi all,

i don't get how i could work with depths oder virtual depths
in processing.

for example, i have a rectangle and a ellipse one to the next in
the center of the screen. when i increase the size of the
rectangle trough a keyInput thats linked to the variable size,
one time my rectangle will overlay my ellipse and fill the screen.

is there a way to let the rectangle fall apart after some time or
to inform the ellipse that it is always on the front ?

here an example:

___________________________________________________________
import processing.opengl.*;
/*
Taste x = Bigger
Taste y = Smaller
*/
   float boxsize = 0;
   float moveX = 0;
   float moveY = 0;

void setup() {
    size(680, 480, OPENGL);
    smooth();
    lights();
    colorMode(RGB);
    }  
   
   
void draw() {
 
   noStroke();
   fill(102, 32, 0, 100);
   rect(0, 0, 40, 480);
   redraw();
   
   translate(pmouseX + moveX, pmouseY +moveY);

    fill(50, 0, 0, 100);
    box(boxsize);

/* ---------------- SIZE Control ---------------- */
   
       if(keyPressed) { if (key == 'y') {    
         if (boxsize <= 500) { boxsize++; } else { boxsize = 500; } } }  
   
       if(keyPressed) { if (key == 'x') {    
          if (boxsize >= 2) { boxsize--; } else { boxsize = 2; } } }

}
___________________________________________________________

thanx for help on that.
greetz
stefan
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seltar
Re: Depth and Overpaint
Reply #1 - Apr 25th, 2006, 7:39pm  
it's the order of things run in draw that determines the depth. i.e

void draw()
{
rect(10,10,50,50); // rect drawn first
ellipse(40,40,50,50); // then ellipse
}

but you can write a script that reads what order they're in from an array, but you should look into oop for that..
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fry
Re: Depth and Overpaint
Reply #2 - Apr 25th, 2006, 7:47pm  
to make things draw such that they're sorted based on their position in the z-axis, use hint(ENABLE_DEPTH_SORT), as noted in the FAQ.

to make things ignore their z order altogether, so that they always overwrite each other, use hint(DISABLE_DEPTH_TEST).
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