code: def in_lamp_reach(p):
      ''' Check if the provided XYPoint can be recreated by a Hue lamp. '''
      v1 = XYPoint(Lime.x - Red.x, Lime.y - Red.y)
      v2 = XYPoint(Blue.x - Red.x, Blue.y - Red.y)
  
      q = XYPoint(p.x - Red.x, p.y - Red.y)
      s = cross_product(q, v2) / cross_product(v1, v2)
      t = cross_product(v1, q) / cross_product(v1, v2)
  
      return (s >= 0.0) and (t >= 0.0) and (s + t <= 1.0f in_lamp_reach(p):
      ''' Check if the provided XYPoint can be recreated by a Hue lamp. '''
      v1 = XYPoint(Lime.x - Red.x, Lime.y - Red.y)
      v2 = XYPoint(Blue.x - Red.x, Blue.y - Red.y)
  
      q = XYPoint(p.x - Red.x, p.y - Red.y)
      s = cross_product(q, v2) / cross_product(v1, v2)
      t = cross_product(v1, q) / cross_product(v1, v2)
  
      return (s >= 0.0) and (t >= 0.0) and (s + t <= 1.0)
docs: Check if the provided XYPoint can be recreated by a Hue lamp.