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Index › Programming Questions & Help › Syntax Questions › making legs on a stick figure bug move
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making legs on a stick figure bug move (Read 623 times)
Dizzle
making legs on a stick figure bug move
Oct 29th, 2009, 10:01pm  
so here's the code:

void setup(){
 size (400, 400);
 noFill();
 smooth();
 strokeWeight (1);
}
void draw(){
 ellipse (100, 100, 50, 100);
 legl(40, 90, 90);
 legl(42, 110, 110);
 legl(50, 130, 130);
 legr(125, 100, 100);
 legr(123, 120, 120);
 legr(115, 140, 140);
 frameRate (30);
}
void legl (int a, int b, int c) {
 beginShape();
   vertex (a+35, b + 10);
   vertex (a+20, b);
   vertex (a, c + 30);
   endShape();
}
void legr (int d, int e, int f) {
 beginShape();
   vertex (d, e);
   vertex (d+15, e - 10);
   vertex (d+35, f + 20);
   endShape();
}

I want to make values c and f increase +1 per frame for 20 frames, then decrease -1 per frame for 20 frames. I was thinking of doing it with the "for" and "if" commands, but trial and error hasn't been fruitful yet.
how can I approach this?

thank you!
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PhiLho 
Re: making legs on a stick figure bug move
Reply #1 - Oct 29th, 2009, 10:39pm  
Put frameRate call in setup().
No need for a 'for' loop, draw() will do the job.
You can have a global variable, say 'dir', set to 1 initially. And another, say 'count', set to 0.
At the start of draw(), add dir to your positions (should be in global variables too) and increment count (count++).
When count reaches 20, invert dir (dir = -dir;) and reset count.
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