Catapult 2016.

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Presentation transcript:

Catapult 2016

Pygame Pygame is a library designed for programming games using 2D graphics. Compared to zellegraphics, it has: much better mouse and keyboard input much faster drawing commands better image support collision-detection sound

Surfaces In Pygame many drawn objects are Surfaces Pygame draws the Surfaces as layers on top of each other. Different surfaces are able to detect collisions with one another based on a “rectangle” that bounds it Pygame.draw draws things ON TOP of a given surface, it does not create a new surface.

Surfaces (cont.)

Moving objects on screen is much different With zellegraphics, you could do things like circle. Move(dx, dy) In Pygame, you repeatedly: Change the coordinates of your object Blank out the screen Redraw your item(s) in the new location cause them to display This is done in the event loop (next slide)

Event Loop In an infinite loop, get input from the user, using it to change the state of your object (like the location) other code that affects objects (like collisions) blank out the screen redraw your item(s) in the new location cause everything to display

Event Loop (cont.) while True: events = pygame.event.get() for event in events: if event.type = QUIT: …

Colors Zellegraphics had built in colors: “red”, “blue”, etc. pygame.Color(color_name) Red = [255, 0, 0] Blue = [0, 0, 255] Lime Green = [50, 205, 50]

Pygame Documentation http://www.pygame.org/docs

Caution At the end of your project, you’ll be given an opportunity to make a standalone (.exe) version of your project. For this to work, all pygame fonts that you use should be SysFonts (created using pygame.font.SysFont) and the pygame default font should not be used [i.e. don’t use pygame.font.SysFont(None, 12)] pygame.time keeps time in milliseconds not seconds

Demos Snow Controllable Ball Moving Smilies (Take 2)

Things to Remember import pygame from pygame.locals import * pygame.init() Must have event loop pygame.display.update() pygame.display.flip() pygame.quit() Flip – updates full display Surface to the screen Update – updates portions of the display