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from OpenGL.GL import *
import OpenGL.Tk as togl
import Tkinter as tkinter
import time

class ColorBox(togl.Opengl):
    """A colorful, rotating box"""

    def __init__(self, master, cnf=()):
        """Initialize GUI and OpenGL"""
        togl.Opengl.__init__(self, master, **cnf)

        self.set_eyepoint(20) # move away from object

        #total degrees of rotation
        self.amountRotated = 0

        #rotate amount in degrees
        self.increment = 2

    def redraw(self, event):
        """Draw box on black background"""

        #clear background and disable lighting
        glClearColor(0.0, 0.0, 0.0, 0.0) #set clearing color
        glClear(GL_COLOR_BUFFER_BIT) #clear background
        glDisable(GL_LIGHTING)

        #constants
        red = (1.0, 0.0, 0.0)
        green = (0.0, 1.0, 0.0)
        blue = (0.0, 0.0, 1.0)
        purple = (1.0, 0.0, 1.0)

        vertices =\
            [((-3.0, 3.0, -3.0), red),
            ((-3.0, -3.0, -3.0), green),
            (( 3.0, 3.0, -3.0), blue),
            (( 3.0, -3.0, -3.0), purple),
            (( 3.0, 3.0, 3.0), red),
            (( 3.0, -3.0, 3.0), green),
            ((-3.0, 3.0, 3.0), blue),
            ((-3.0, -3.0, 3.0), purple),
            ((-3.0, 3.0, -3.0), red),
            ((-3.0, -3.0, -3.0), green)]

        #begin drawing
        glBegin(GL_QUAD_STRIP) 

        #change color and plot point for each vertex
        for vertex in vertices:
            location, color = vertex
            apply(glColor3f, color)
            apply(glVertex3f, location)

        #stop drawing
        glEnd() 

    def update(self):
        """Rotate box"""
        
        #change rotation direction
        if self.amountRotated >= 500:
            self.increment = -2 #rotate left
            
        #change rotation direction
        elif self.amountRotated <= 0: 
            self.increment = 2 #rotate right

        #rotate box around x, y, z axis (1.0, 1.0, 1.0)
        glRotate(self.increment, 1.0, 1.0, 1.0)
        self.amountRotated += self.increment
        
        #redraw geometry
        self.tkRedraw()


if __name__ == "__main__":

    # Da beim ersten import von OpenGl.Tk ein Tk Fenster gebaut wird zerstoere
    # ich dieses hier, da es fuer mich keinen ersichtlichen nutzen hat.
    try:
        togl._default_root.destroy()
    except tkinter.TclError:
        pass
    
    root = tkinter.Tk()
    root.tk.call('package', 'require', 'Togl')
    
    frame_left = tkinter.Frame(root)
    frame_left.pack(side="left")
    
    bt = tkinter.Button(frame_left, text="Do something!")
    bt.pack()
    
    cb = ColorBox(root, dict(double=1))
    cb.pack(expand="yes", fill="both")

    while True:
        time.sleep(0.025)
        cb.update()
        root.update()

    root.mainloop()