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PYGLET – On Draw Event
  • Last Updated : 22 Sep, 2020

In this article we will see how we can trigger window on draw event 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). The EventLoop will dispatch this event when the window should be redrawn. This will happen during idle time after any window events and after any scheduled functions were called. The window will already have the GL context, so there is no need to call switch_to. The window’s flip method will be called after this event, so your event handler should not.

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

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

Below is the syntax of the window on draw event, this method get called when this event is triggered

@window.event       
def on_draw():
    print("Window Draw Event")

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():
      
    # printing some message
    print("Window Draw event called")
      
    # clearing the window
    window.clear()
      
    # drawing the label on the window
    label.draw()
      
# key press event    
@window.event
def on_key_press(symbol, modifier):
      
    print("nn")
    # key "C" get press
    if symbol == pyglet.window.key.C:
          
        # close the window
        window.close()
  
          
  
   
  
# image for icon
img = image = pyglet.resource.image("logo.png")
  
# setting image as icon
window.set_icon(img)
                 
# start running the application
pyglet.app.run()

Output :

Window Draw event called

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