/* built with Studio Sketchpad: 
 *   https://sketchpad.cc
 * 
 * observe the evolution of this sketch: 
 *   https://studio.sketchpad.cc/sp/pad/view/ro.455KVE-l4h2/rev.177
 * 
 * authors: 
 *   Ari Bader-Natal

 * license (unless otherwise specified): 
 *   creative commons attribution-share alike 3.0 license.
 *   https://creativecommons.org/licenses/by-sa/3.0/ 
 */ 



// This sketch builds on a prior work, "Untitled Sketch", created by [unnamed author]
// http://sketchpad.cc/sp/pad/view/ro.npuJTk36kNy/rev.1022

int i = 50;
int step = 3;

void setup() {
    background(255);
    size(400, 400); 
    smooth();
    frameRate(30);
    strokeWeight(8);
    noFill();
}  



void draw() {
    background(255);

    translate(width/2, height/2);
    
    for (n = 0; n < 128; n++) {
        stroke(0, n*2, 256-n, n/2);
        rotate(radians(0 + (n * 15)));
        ellipse(30 + (sin(radians(i * 12))), 25 - i/2, 100, 75 + i);
    }
    
    if (i > 160) {
        step *= -1;
    }
    if (i < -25) {
        step *= -1;    
    }
    
    i+=step;
}