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#!/usr/bin/env python
""" pygame.examples.moveit
This is the full and final example from the Pygame Tutorial,
"How Do I Make It Move". It creates 10 objects and animates
them on the screen.
It also has a separate player character that can be controlled with arrow keys.
Note it's a bit scant on error checking, but it's easy to read. :]
Fortunately, this is python, and we needn't wrestle with a pile of
error codes.
"""
import os
import pygame as pg
main_dir = os.path.split(os.path.abspath(__file__))[0]
# Height and Width of screen
WIDTH = 640
HEIGHT = 480
# Height and width of the sprite
SPRITE_WIDTH = 80
SPRITE_HEIGHT = 60
# our game object class
class GameObject:
def __init__(self, image, height, speed):
self.speed = speed
self.image = image
self.pos = image.get_rect().move(0, height)
# move the object.
def move(self, up=False, down=False, left=False, right=False):
if right:
self.pos.right += self.speed
if left:
self.pos.right -= self.speed
if down:
self.pos.top += self.speed
if up:
self.pos.top -= self.speed
# controls the object such that it cannot leave the screen's viewpoint
if self.pos.right > WIDTH:
self.pos.left = 0
if self.pos.top > HEIGHT - SPRITE_HEIGHT:
self.pos.top = 0
if self.pos.right < SPRITE_WIDTH:
self.pos.right = WIDTH
if self.pos.top < 0:
self.pos.top = HEIGHT - SPRITE_HEIGHT
# quick function to load an image
def load_image(name):
path = os.path.join(main_dir, "data", name)
return pg.image.load(path).convert()
# here's the full code
def main():
pg.init()
clock = pg.time.Clock()
screen = pg.display.set_mode((WIDTH, HEIGHT))
player = load_image("player1.gif")
entity = load_image("alien1.gif")
background = load_image("liquid.bmp")
# scale the background image so that it fills the window and
# successfully overwrites the old sprite position.
background = pg.transform.scale2x(background)
background = pg.transform.scale2x(background)
screen.blit(background, (0, 0))
objects = []
p = GameObject(player, 10, 3)
for x in range(10):
o = GameObject(entity, x * 40, x)
objects.append(o)
pg.display.set_caption("Move It!")
# This is a simple event handler that enables player input.
while True:
# Get all keys currently pressed, and move when an arrow key is held.
keys = pg.key.get_pressed()
if keys[pg.K_UP]:
p.move(up=True)
if keys[pg.K_DOWN]:
p.move(down=True)
if keys[pg.K_LEFT]:
p.move(left=True)
if keys[pg.K_RIGHT]:
p.move(right=True)
# Draw the background
screen.blit(background, (0, 0))
for e in pg.event.get():
# quit upon screen exit
if e.type == pg.QUIT:
return
for o in objects:
screen.blit(background, o.pos, o.pos)
for o in objects:
o.move(right=True)
screen.blit(o.image, o.pos)
screen.blit(p.image, p.pos)
clock.tick(60)
pg.display.update()
pg.time.delay(100)
if __name__ == "__main__":
main()
pg.quit()
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