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common.py
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common.py
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# -*- encoding: utf-8 --
""" Funciones comunes"""
import pygame, pygame.font, pygame.event, pygame.draw, string
from pygame.locals import MOUSEBUTTONDOWN, MOUSEBUTTONUP
from pygame.locals import MOUSEMOTION, ACTIVEEVENT
from pygame.locals import K_MINUS , K_RETURN, K_BACKSPACE, KEYDOWN, K_ESCAPE
show_tips = True
MOUSE_EVENTS = [MOUSEBUTTONDOWN, MOUSEBUTTONUP, MOUSEMOTION, ACTIVEEVENT]
MOTION_SPEED = 5.0
def load_image(imagefile):
"""Carga una imagen dentro del tema indicado."""
image = pygame.image.load('ima/%s' %(imagefile))
return image.convert_alpha()
def bring_to_front(sprite):
"""Trae un sprite al frente del grupo."""
for group in sprite.groups():
group.remove(sprite)
group.add(sprite)
def interpolate((pos_x, pos_y), (to_x, to_y)):
"""Retorna un generador que aproxima gradualmente un punto a otro."""
while True:
dist_x = to_x - pos_x
dist_y = to_y - pos_y
dta_x = dist_x / MOTION_SPEED
dta_y = dist_y / MOTION_SPEED
if abs(dist_x) >= 1 or abs(dist_y) >= 1:
pos_x += dta_x
pos_y += dta_y
yield int(pos_x), int(pos_y)
else:
yield to_x, to_y
break
def get_key():
"""Obtiene una tecla """
while True:
event = pygame.event.poll()
if event.type == KEYDOWN:
return event.key
else:
pass
def display_box(screen, message):
"Print a message in a box in the middle of the screen"
fontobject = pygame.font.Font(None,18)
pygame.draw.rect(screen, (0,0,0),
((screen.get_width() / 2) - 100,
(screen.get_height() / 2) - 10,
200,20), 0)
pygame.draw.rect(screen, (255,255,255),
((screen.get_width() / 2) - 102,
(screen.get_height() / 2) - 12,
204,24), 1)
if len(message) != 0:
screen.blit(fontobject.render(message, 1, (255,255,255)),
((screen.get_width() / 2) - 100, (screen.get_height() / 2) - 10))
pygame.display.flip()
def ask(screen, question):
"ask(screen, question) -> answer"
pygame.font.init()
current_string = []
display_box(screen, question + ": " + string.join(current_string,""))
while 1:
inkey = get_key()
if inkey == K_BACKSPACE:
current_string = current_string[0:-1]
elif inkey in [K_RETURN, K_ESCAPE]:
break
elif inkey == K_MINUS:
current_string.append("_")
elif inkey <= 127:
if len(current_string) < 5:
current_string.append(chr(inkey))
display_box(screen, question + ": " + string.join(current_string,""))
return string.join(current_string,"")