/* built with Studio Sketchpad: 
 *   https://sketchpad.cc
 * 
 * observe the evolution of this sketch: 
 *   https://dflab.sketchpad.cc/sp/pad/view/ro.$JVOrqHG5Cd/rev.555
 * 
 * authors: 
 *   Pedro Soares

 * 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 = 320;
 
void setup () {

size (800,700);
background (125, 0, 125);
frameRate (50);
 
 px = new float[num_particles];
    py = new float[num_particles];
    
    for (int i = 0; i < num_particles; i++) {
        px[i] = random (width);
        py[i] = random (height);
        
}
}

float a = 0;
float b = 0;
float d = 0;
float c = 300;

void draw () {
  
 background (125, 0, 125);
 fill (120);
 strokeWeight (2);
 ellipse (mouseX, mouseY, 50, 50);
 fill (255,0,0);
 ellipse (mouseX, mouseY, 20, 20);
  
  stroke (255, 200,0);
  for (int i = 0; i < num_particles; i = i+1) {
        px[i] = constrain (px[i] + random (-5, 5), 0, width);
        py[i] = constrain (py[i] + random (-5, 5), 0, height);
        
        if (dist (px[i], py[i], mouseX, mouseY) < 40) {
            vx = (px[i] - mouseX);
            vy = (py[i] - mouseY);
            
            px[i] = px[i] + vx;
            py[i] = py[i] + vy;
        }
        ellipse (px[i], py[i], 5, 5);
    }
  
  if (mousePressed ==true){
  noStroke();
  fill (255,255,0);
  ellipse (mouseX, mouseY, a, a);
  fill (255,125,0);
  ellipse (mouseX, mouseY, -30+a, -30+a);
  fill (255,0,0);
  ellipse (mouseX, mouseY, -140+a, -140+a);
  
  stroke (255,255,0);
  strokeWeight (20);
  noFill ();
  ellipse (mouseX, mouseY, 15+b, 15+b);
  strokeWeight (5);
  ellipse (mouseX, mouseY, -10+d, -10+d);
  
    strokeWeight (15);
    stroke (255, 180, 0, c);
  for (int i = 0; i < num_particles; i = i+1) {
        px[i] = constrain (px[i] + random (-5, 5), 0, width);
        py[i] = constrain (py[i] + random (-5, 5), 0, height);
        
        if (dist (px[i], py[i], mouseX, mouseY) < 10) {
            vx = (px[i] - mouseX);
            vy = (py[i] - mouseY);
            
            px[i] = px[i] + vx;
            py[i] = py[i] + vy;
        }
        ellipse (px[i], py[i], 5, 5);
    }
  c = c-2
  a = a+19;
  b = b+26;
  d = d+24;
} 
else {
  a = 0;
  b = 0;
  d = 0;
  c = 300;
  stroke (0);

}
}