int x,y;

void setup(){

 size(300,300);

}

void loop(){

  background(255,255,255);
  drawdot();

 }



 void drawdot(){
   rectMode(CENTER_DIAMETER);
   ellipseMode(CENTER_DIAMETER);

   for(int x=0; x<300; x=x+3){
     for(int y=0; y<300; y=y+3){
       if(x<300){
         point(x,y);
       }

     }
     stroke(255,255,255);
     ellipse(mouseX,mouseY,50,50);
     stroke(0,0,0);
     rect(mouseX,mouseY,10,10);

   }

 }