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PYGLET – Flipping Window Buffer
  • Last Updated : 22 Sep, 2020

In this article we will see how we can flip the window buffer in PYGLET module in python. Pyglet is easy to use but powerful library for developing visually rich GUI applications like games, multimedia etc. A window is a “heavyweight” object occupying operating system resources. Windows may appear as floating regions or can be set to fill an entire screen (fullscreen). Flipping means to swap the OpenGL front and back buffers. Flipping method on a double-buffered window to update the visible display with the back buffer. The contents of the back buffer is undefined after this operation. Windows are double-buffered by default. Flipping is called automatically by EventLoop after the on_draw() event.

We can create a window with the help of command given below

 pyglet.window.Window(width, height, title)

In order to create window we use flip method with the window object

Syntax : window.flip()

Argument : It takes no argument



Return : It returns None

Below is the implementation




# importing pyglet module
import pyglet
import pyglet.window.key
  
# width of window
width = 500
  
# height of window
height = 500
  
# caption i.e title of the window
title = "Geeksforgeeks"
  
# creating a window
window = pyglet.window.Window(width, height, title)
  
# text 
text = "GeeksforGeeks"
  
# creating a label with font = times roman
# font size = 36
# aligning it to the centre
label = pyglet.text.Label(text,
                          font_name ='Times New Roman',
                          font_size = 36,
                          x = window.width//2, y = window.height//2,
                          anchor_x ='center', anchor_y ='center')
  
# on draw event
@window.event
def on_draw():
      
    # clearing the window
    window.clear()
      
    # drawing the label on the window
    label.draw()
      
# key press event    
@window.event
def on_key_press(symbol, modifier):
      
    # key "F" get press
    if symbol == pyglet.window.key.F:
          
        # flipping the window buffer
        window.flip()
          
  
# start running the application
pyglet.app.run()

Output :
Window get flipped when key “F” get pressed, it basically refresh the screen

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