PSystem ps;
Particle p[];

void setup() {
  size(600,600);
  ps = (PSystem)loadPlugin("PSystem");
  ps.defaultSpringRestLength = 0.2;
  ps.defaultSpringStrength = 0.005;
  
  
  Particle p[] = new Particle[100];
  for (int v = 1; v < 74; v=v+6)  {                   // 72/6=12 offsets for web
       for (int i = v; i < v+6; i++) {                // defines each one of the offsets
       float webX;                                    
       float webY;  
       float radius = i*6;
       webX = radius * cos((TWO_PI / 6)*i) + 300;     // position for each particle on X axis
       webY = radius * sin((TWO_PI / 6)*i) + 300;     // position for each particle on Y axis
       p[i] = new Particle(webX, webY, frame);
       ps.addParticle(p[i]);                          // particle drawn
          if (i>1) {
          ps.addSpring(p[i], p[i-1]);                 // springs in one offset
          }        
          if (i>6) {                                  // springs in between offsets
          ps.addSpring(p[i], p[i-6]);
          }
      }
    }
   
   for (int m = 73; m < 79; m++){                     // fixes outermost offset
      p[m].fix();
   }
   ps.setGravity(0, 0, -0.4);                         // pulls the web 'down'
   
}
void loop() {
stroke(200, 50, 90);                                  // web color
 if (mouseX < 300 && mouseY < 300) {
 ps.setGravity(mouseX/100, mouseY/1000, mouseY/1000); 
 }
 else {
 ps.setGravity(-mouseX/100,-mouseY/1000, mouseY/1000);//variable gravity with mouse
 }                                                    //be gentle
background(0, 0, 0);
ps.draw();
}                                                     //thanks Axel.