/* built with Studio Sketchpad: 
 *   https://sketchpad.cc
 * 
 * observe the evolution of this sketch: 
 *   https://studio.sketchpad.cc/sp/pad/view/ro.-OZif9hDFrk/rev.275
 * 
 * authors: 
 *   Bruno Buccolo
 *   
 *   

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



Pill[] pills = new Pill[50];

void setup() { 

    background(255);
    size(600, 600); 
    smooth();
    frameRate(30);

    for (var i = 0; i < 50; i++){
        pills[i] = new Pill(i*15 + 10);
    }
} 

void draw() {
    //background(255);
    for (var i = 0; i < 50; i++){
        pills[i].update();
    }
}

class Pill { 

    int rand = random(255);
    float arc_length = 2*PI*(rand/255);
    float start_pos = rand*PI;
    float end_pos = arc_length;
    int size;
    float vel = (rand/255)*0.4;
    int weigth = random(15) + 10;
    int color = rand - 50;
    int direction = (random(2) > 1 ? 1 : -1);

    Pill(int size_input) {
        this.size = size_input;
        stroke(color, 100, 100);
        strokeWeight(weigth);
        arc(300, 300, size, size, start_pos, end_pos);
        noFill();
    } 

      void update() { 
        if (direction > 0){
            start_pos = end_pos;
            end_pos = (end_pos + PI/8*vel);
        } else {
            end_pos = start_pos;
            start_pos = (start_pos -PI/8*vel);
        }
        stroke(random(color), random(255-color), 100);
        strokeWeight(weigth);
        arc(300, 300, size, size, start_pos, end_pos);
      }
}