Hello,

I want to draw a spiral fitting in a rectangle. So my sketch is very basic.

However it doesn't work. I haven't worked with Processing for a while so I must have forgotten something obvious, but what ?

Thank you in advance for helping.

1. int myLength = 0; // initial axis length in number of squares
2. int xpos = 0;
3. int ypos = 0;
4. void setup() {
5.   size(500, 500, JAVA2D);
6.   background(128, 128, 128);
7.   stroke(255, 255, 0);
8.   fill(255, 255, 0);
9.   rectMode(CENTER);
10.     // initial positioning
11.   xpos = width/2;
12.   ypos = height/2;
13.   translate (xpos, ypos);
14. }
15. void loop() {
16.   for (int i = 0; i < 50 ; i++) {
17.     myLength++;
18.     for (int j = 0; j < myLength; j++) { // units do draw per line extends from step to step
19.       rect(0, 0, 20, 20);
20.       translate(20, 0);
21.     }
22.     rotate(PI/2.); // rotates 90 degrees before next step
23.   }
24. }