/* built with Studio Sketchpad: 
 *   https://sketchpad.cc
 * 
 * observe the evolution of this sketch: 
 *   https://dflab.sketchpad.cc/sp/pad/view/ro.W7g7trmwqvu/rev.1
 * 
 * authors: 
 *   Sofia Gomez

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



float px[];
float py[];
 
int num_particles = 50;
 
void setup() {  
    size(300, 300); 
 
    background(255);
    fill (220, 235, 44);
    
    px = new float[num_particles];
    py = new float[num_particles];
    
    for (int i = 10; i < num_particles; i++) {
        px[i] = random (width);
        py[i] = random (height);
    }
} 
 
// as instruções que estiverem dentro desta função draw
// são executadas a cada novo frame
 
void draw() {
    background (38, 42, 62);
    
    for (int i = 0; i < num_particles; i = i+1) {
        px[i] = constrain (px[i] + random (-10, 10), 0, width);
        py[i] = constrain (py[i] + random (-10, 10), 0, height);
 
        ellipse (px[i], py[i], 10, 10);
    }
}