void setup (){
  size(400,400);
  smooth();
}
float cuberoot = 1.25992105;
float theta=radians(24);
float angle;
int xorg=150; int yorg=300;

void kempe (float x, float y){
  float bx = y * cos (theta);
  float by = y * sin (theta);
  float phi = atan (by / (bx - x));
  float cx = bx + x * cos (2 * phi);
  float cy = by + x * sin (2 * phi);
  line(0, 0, x, 0);
  line(x, 0, cx, cy);
  line(cx, cy, bx, by);
  line(bx, by, 0, 0);
}

void draw (){
fill(255);
rect(0,0,400,400);
fill(0);
noFill();
pushMatrix();
  translate(xorg,yorg);
  scale(1,-1);

  kempe(100,100*cuberoot);
  rotate(theta);
  kempe(100*cuberoot,100*cuberoot*cuberoot);
  rotate(theta);
  kempe(100*cuberoot*cuberoot, 200);
  popMatrix();
}
void mouseDragged(){
  print(mouseX);print(" ");
  print(mouseY);print(" ");
  if(mouseX==xorg){angle=PI/2;}
  else{if(xorg<mouseX){
    angle=atan2(yorg-mouseY,mouseX-xorg);}
    else{angle=PI-atan2(yorg-mouseY,xorg-mouseX);}}
    theta=angle/3;
    println(degrees(theta));
    draw();
}