/* built with Studio Sketchpad: 
 *   https://sketchpad.cc
 * 
 * observe the evolution of this sketch: 
 *   https://studio.sketchpad.cc/sp/pad/view/ro.9fB95erId$S/rev.118
 * 
 * authors: 
 *   Orla Bradley

 * 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, "Modified clone of 'Spinner'", created by Ari Bader-Natal
// http://studio.sketchpad.cc/sp/pad/view/ro.93DzrRzw3-CL8/rev.173


// 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(800);
    size(400, 400); 
    smooth();
    frameRate(40);
    strokeWeight(10);
    noFill();
} 



void draw() {
    background(600);

    translate(width/3, height/3);
    
    for (n = 0; n < 130; n++) {
        stroke(0, n*4, 300-n, n/2);
        rotate(radians(0 + (n * 22)));
        ellipse(30 + (sin(radians(i * 14))), 27 - i/4, 102, 80 + i);
    }
    
    if (i > 180) {
        step *= -2;
    }
    if (i < -28) {
        step *= -2;    
    }
    
    i+=step;
}