Handling Keyboards Inputs
Basic steps to handle keyboard input:
- Import required libraries.
- Create a display surface object using display.set_mode() method of pygame.
- Load the image/object.
- Create a click event i.e., KEYDOWN
- Define all the events keys and perform task.
- Create a pause event i.e., KEYUP
- Copying the Text surface object to the display surface object using blit() method of pygame display surface object.
- Show the display surface object on the pygame window using the display.update() method of pygame.
Example:
Python3
# importing all the required librariesimport pygamefrom pygame.locals import *from sys import exit# initiating pygame library to use it's # functionspygame.init()# declaring windows/surface width and heightsize = width, height = 740, 480screen = pygame.display.set_mode(size)# loads a new image from a file and convert()# will create a copy of image on surfaceimg = pygame.image.load("char.png").convert()# declaring value to variablesx, y = 0, 0move_x, move_y = 0, 0while True: for event in pygame.event.get(): if event.type == pygame.QUIT: # pygame.QUIT deactivates pygame exit() # exit() is sys function used to # kill the program # KEYDOWN event will be triggered everytime # we press a button if event.type == KEYDOWN: if event.key == K_LEFT: move_x = -0.3 # object moves -0.3 towards x axis print("pressed LEFT") elif event.key == K_RIGHT: move_x = +0.3 # object moves 0.3 towards x axis print("pressed RIGHT") elif event.key == K_UP: move_y = -0.3 # object moves -0.3 towards y axis print("pressed UP") elif event.key == K_DOWN: move_y = +0.3 # object moves 0.3 towards y axis print("pressed DOWN") # K_LCTRL event will be triggered everytime we # press left CTRL button elif event.key == K_LCTRL: # declaring new image file to update image # everytime left CTRL is pressed img = pygame.image.load("char1.png") pygame.display.update() # update image elif event.key == K_BACKSPACE: # this the default file we declared in start # and it will restore it everytime we press # backspace img = pygame.image.load("char.png") pygame.display.update() # update image # it will get triggered when left key is released if event.type == KEYUP: if event.key == K_LEFT: move_x = 0 # movement stops elif event.key == K_RIGHT: move_x = 0 # movement stops elif event.key == K_UP: move_y = 0 # movement stops elif event.key == K_DOWN: move_y = 0 # movement stops """KEYUP event will be triggered when the release the keys and x,y coordinates will not change anymore""" x += move_x y += move_y # updating coordinate values of x,y screen.fill((255, 255, 255)) # the function will fill the background with white color screen.blit(img, (x, y)) # blit() function will copy image file to x,y coordinates. pygame.display.update() # draw the objects on screen |
Output:
Pygame – Input Handling
Pygame is a cross-platform set of Python modules designed for writing video games. It includes computer graphics and sound libraries designed to be used with the Python programming language.
The sys module in Python provides various functions and variables that are used to manipulate different parts of the Python runtime environment. It allows operating on the interpreter as it provides access to the variables and functions that interact strongly with the interpreter.
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