1  # colormixer
       2  
       3  from turtle import Screen, Turtle, mainloop
       4  
       5  class ESC[4;38;5;81mColorTurtle(ESC[4;38;5;149mTurtle):
       6  
       7      def __init__(self, x, y):
       8          Turtle.__init__(self)
       9          self.shape("turtle")
      10          self.resizemode("user")
      11          self.shapesize(3,3,5)
      12          self.pensize(10)
      13          self._color = [0,0,0]
      14          self.x = x
      15          self._color[x] = y
      16          self.color(self._color)
      17          self.speed(0)
      18          self.left(90)
      19          self.pu()
      20          self.goto(x,0)
      21          self.pd()
      22          self.sety(1)
      23          self.pu()
      24          self.sety(y)
      25          self.pencolor("gray25")
      26          self.ondrag(self.shift)
      27  
      28      def shift(self, x, y):
      29          self.sety(max(0,min(y,1)))
      30          self._color[self.x] = self.ycor()
      31          self.fillcolor(self._color)
      32          setbgcolor()
      33  
      34  def setbgcolor():
      35      screen.bgcolor(red.ycor(), green.ycor(), blue.ycor())
      36  
      37  def main():
      38      global screen, red, green, blue
      39      screen = Screen()
      40      screen.delay(0)
      41      screen.setworldcoordinates(-1, -0.3, 3, 1.3)
      42  
      43      red = ColorTurtle(0, .5)
      44      green = ColorTurtle(1, .5)
      45      blue = ColorTurtle(2, .5)
      46      setbgcolor()
      47  
      48      writer = Turtle()
      49      writer.ht()
      50      writer.pu()
      51      writer.goto(1,1.15)
      52      writer.write("DRAG!",align="center",font=("Arial",30,("bold","italic")))
      53      return "EVENTLOOP"
      54  
      55  if __name__ == "__main__":
      56      msg = main()
      57      print(msg)
      58      mainloop()