Pygame – Mouse events


Pygame – Mouse Events



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Pygame recongnizes three mouse events, namely, MOUSEMOTION, MOUSEBUTTONUP, and MOUSEBUTTONDOWN. The corresponding event object returns the coordinates of position at which mouse is pressed/released and the button number.

For example, a MOUSEBUTTONDOWN event object will display following result −


<Event(1025-MouseButtonDown {''pos'': (398, 328), ''button'': 1, ''window'': None})>

Example

To obtain the coordinates of position of button down, we can use get_pos() function associated with event object.


import pygame, sys

pygame.init()
screen = pygame.display.set_mode((640, 480))
pygame.display.set_caption("Hello World")
while True:
   for event in pygame.event.get():
      if event.type == pygame.QUIT:
         pygame.quit()
         sys.exit()
      if event.type == pygame.MOUSEBUTTONDOWN:
         pos=pygame.mouse.get_pos()
         btn=pygame.mouse
         print ("x = {}, y = {}".format(pos[0], pos[1]))

Output

Run above code and press the mouse button at random positions on the game window.


x = 192, y = 160
x = 419, y = 245
x = 204, y = 405
x = 449, y = 17
x = 12, y = 15

The MOUSEMOTION event object captures instantaneous position of moving mouse location.


if event.type == pygame.MOUSEMOTION:
   pos=event.pos 
   print ("x = {}, y = {}".format(pos[0], pos[1]))

Other important functions and attributes in pygame.mouse module are as follows −











pygame.key.get_pressed get the state of the mouse buttons
pygame.mouse.get_pos get the mouse cursor position
pygame.mouse.get_rel get the amount of mouse movement
pygame.mouse.set_pos set the mouse cursor position
pygame.mouse.set_visible hide or show the mouse cursor
pygame.mouse.get_visible get the current visibility state of the mouse cursor
pygame.mouse.get_focused check if the display is receiving mouse input
pygame.mouse.set_cursor set the image for the mouse cursor
pygame.mouse.set_system_cursor set the mouse cursor to a system variant

Pygame defines following system cursors −













pygame.SYSTEM_CURSOR_ARROW arrow
pygame.SYSTEM_CURSOR_IBEAM i-beam
pygame.SYSTEM_CURSOR_WAIT wait
pygame.SYSTEM_CURSOR_CROSSHAIR crosshair
pygame.SYSTEM_CURSOR_SIZENWSE double arrow pointing northwest and southeast
pygame.SYSTEM_CURSOR_SIZENESW double arrow pointing northeast and southwest
pygame.SYSTEM_CURSOR_SIZEWE double arrow pointing west and east
pygame.SYSTEM_CURSOR_SIZENS double arrow pointing north and south
pygame.SYSTEM_CURSOR_SIZEALL four pointed arrow
pygame.SYSTEM_CURSOR_NO slashed circle or crossbones
pygame.SYSTEM_CURSOR_HAND hand

Following statement will set the game window cursor to crosshair.


pygame.mouse.set_system_cursor(pygame.SYSTEM_CURSOR_CROSSHAIR)

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