Python-based Pygame implementation method for responding to in-game events (source code)

This example describes Python's approach to responding to events in the game based on the Pygame implementation. Share to everyone for your reference, as follows:

Let's look at the demo effect I've done:

When the player presses on the keyboard: up, down, left, right button, the background will print out the number of keys that the player presses, and the graphic will move with it

This is the phenomenon that exists objectively above.

So what is an event?

You asked me to make a definition, I don't know, I can only give an example to illustrate, for example, the next code, listing some of the events in the game

"'  event             generation path              parameter '  QUIT            user pressed off button          none  ativeevent         pygame is activated or hidden          gain,  state KEYDOWN          Keyboard is pressed              Unicode, key, mod  KEYUP           keyboard is released              key, mod  mousemotion        Mouse Mobile              pos , rel, buttons  mousebuttondown      Mouse Press              pos, button  mousebuttonup       mouse release              pos, Button  Joyaxismotion       Game handle (Joystick or pad) move      Joy, axis, value  joyballmotion       game ball (joy balls)? Move      Joy, Axis, value  joyhatmotion gamepad        (Joystick)? Move      Joy, axis, value  joybuttondown gamepad       Press              Joy, Button  Joybuttonup        game handle let go              of joy, button  videoresize        pygame window Scaling          size, W, h  Videoexpose        pygame window partially exposed (expose)      none  userevent         triggered a user event          code ""

such as mouse down events, mouse release events, keyboard press events .....

The occurrence of these events is accompanied by the occurrence of an action, precisely because there are movements, so we can catch these movements, so as to respond accordingly

For example, if we press the left button of the keyboard, the picture will move to the left for a distance ...

The code section is as follows:

#handle the key eventimport pygamefrom pygame.locals import *from sys import exit ' ' Event generation Path parameter              QUIT user presses the close button None ativeevent Pygame is activated or hidden gain, state KEYDOWN keyboard is pressed Unicode, key, mod KEYUP keyboard is released key, mod mousemotion mouse Mobile pos, rel, button S Mousebuttondown Mouse Press pos, button Mousebuttonup mouse release pos, button Joyaxismotion Tour Play handle (Joystick or pad) move joy, axis, value joyballmotion game ball (joy balls)? Move joy, axis, value joyhatmotion Tour              Play handle (Joystick)? Move joy, axis, value Joybuttondown gamepad press Joy, button Joybuttonup GamePad release Joy, button videoresize pygame window scaling Size, W, H videoexpose pygame window partially exposed (expose) No Ne userevent triggered a user event code ' __author__ = {' name ': ' Hongten ', ' Mail ': ' hongtenzone@foxmail.com ' , ' QQ ': ' 6487198', ' Version ': ' 1.0 '}bg_image = ' c:\\py\\ball.png ' pygame.init () screen = Pygame.display.set_mode ((500, 500), 0, 32) BG = pygame.image.load (bg_image). CONVERT () x, y = 0, 0move_x, move_y = 0, 0while 1:for event in Pygame.event.get (): #p Rint (event.type) if Event.type = = Quit:exit () If Event.type = Keydown:print (Event.key) #event. Key return Back is a numeric value, and K_left,k_up,k_right,k_down, and so are constants, #他们代表的也是一个数字值, these numeric values can be used: print (Event.key) get to #如: K_left = 276 # K_ Up = 273 #所以下面的代码可以替换为: #if Event.key = = 276: # move_x = -10 if Event.key = = K_left:move_x = -10 elif Event.key = = K_up:move_y = -10 elif Event.key = k_right:move_x = Ten elif event.ke     y = = K_down:move_y = Elif Event.type = = keyup:move_x = 0 move_y = 0 x + = move_x y + = move_y #print (x, y) Screen.fill ((0, 0, 0)) Screen.blit (BG, (x, y)) pygame.display.update ()

Full instance code code click here to download this site.

I hope this article is helpful for Python program design.

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