recursively smaller lines!

recursive_lines.pde

void setup(){
  //size(800,600);
  fullScreen(P2D);
}
float step ;
void draw(){
 background(255);
 step = map(mouseX, 0, width, .1f, 1f); 
 drawRecursively(width/2, height/2, width/3, true);
}

void drawRecursively(float x, float y, float size, boolean hor){
 if(size < width/2 && size > 2f){
   if(hor){
     line(x-size, y, x+size, y);
     drawRecursively(x-size, y, size * step, !hor);
     drawRecursively(x+size, y, size * step, !hor);
   }else{
     line(x, y-size, x, y+size);
     drawRecursively(x, y-size, size * step, !hor);
     drawRecursively(x, y+size, size * step, !hor);
   }
 }
}