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Index › Programming Questions & Help › Syntax Questions › trace and no trace at the same time
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trace and no trace at the same time (Read 386 times)
brin
trace and no trace at the same time
Sep 20th, 2006, 9:17pm  
Hello everybody,

how could I tell a moving object ("A") to leave a trace on the screen, while a second object ("B") moves without leaving a trace - at the same time?

for example:

float a = 20;

void setup()
{
 size(500, 200);
 background(51);
 stroke(255);
 framerate(30);
}

void draw()
{
 background(51);//delete --> trace
 a = a + 1;
 if (a < 0) {
   a = height;
 }
 rect(a, 75, 10,10);  
}


thanks in advance,

brin
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sd
Re: trace and no trace at the same time
Reply #1 - Sep 21st, 2006, 5:33am  
Instead of using background to erase the rectangle, draw a rectangle at the old position, with the color of the background that you want.
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Nothing is Impossible
 
brin
Re: trace and no trace at the same time
Reply #2 - Sep 22nd, 2006, 12:33pm  
Very cool, this idea.

The background isn´t of just one colour but drawn by the programm so far. I´ll experiment with "taking a picture" of what the rectangle (or whatever object) is upon, should be possible with "copy()".

Thanks!
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