Mudpile m = null;

void setup(){
   size(500,500);
   background(150,150,20);
  
frameRate(10);
strokeWeight(4);
stroke(125,125,15);
fill(150,150,20);
  
}


void mousePressed(){
  if(m == null){
   m = new Mudpile(mouseX,mouseY);
  }
}

float ANGSTEP = .08;
float VARMUL = .025;
float SHRINK = 10;
float CENTERMOVE = 2;

void draw(){
  
  if(m != null) {
    if(!m.draw()) m = null;
  }

}

class Mudpile{
      float cx = 250; 
      float cy = 250;
      float cxs = 0,cys = 0;
      float baser = random(50,150);
  Mudpile(float sx, float sy){
      cx = sx; cy = sy;

    }
    
    boolean draw(){
        if(baser <= 0) return false;
  pushMatrix();
  translate(cx,cy);
  
  if(cx < mouseX) cxs+= CENTERMOVE; else cxs-=CENTERMOVE;
  if(cy < mouseY) cys+=CENTERMOVE; else cys-=CENTERMOVE;
  cx += cxs;
  cy += cys;
  
  
  beginShape();
   float first = baser + random(-15,15);
   
   vertex(first * cos(0),first * sin(0));
  for(float a = ANGSTEP; a < PI*2; a += ANGSTEP){
    float r = baser + random(-baser * VARMUL, baser * VARMUL);
    vertex(r * cos(a),r * sin(a));
    
  }
   vertex(first * cos(0),first * sin(0));

  if(!mousePressed) baser -= SHRINK;
  
  endShape();
    popMatrix();
        return true;
    }

}