// fork from tw:ina_ani:シンプル
scale(0.1)
 fs("black")
  text("pos:" + floor(mx*100) + "," + floor(my*100))
  shift(0,2)
   text('atan2: ' + floor(atan2(my,mx)*100))

fig()
 xy(0,0)
 xy(mx, my)

shift(mx,my)
 scale(0.1)
  rect()