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--- en:part2:pygame:step008 [2010/06/15 11:16]
Horst JENS
+++ — (current)
@@ Line 1: / Line 1: @@
-^ [[:en:part2:pygame:step007| ← previous]] ^ [[en:part2:pygame:start| ↑ Overview]] ^ [[:en:part2:pygame:step009| → next ]] ^
-====== step 008 - animation and sprite sheet ======
-Remember the Subsurfaces from the last step ? And remember that the snake had always the same grinning facial expression ? Now, let's make some animated **sprites**((a 2d-object moving around is referred as a [[wp>Sprite_(computer_graphics)]])) - not pygame sprites, but surfaces that show different images of an animation cycle, like a bird flapping it wings.
-{{ :en:part2:spritesheet008.jpg?300|}}
-Instead of painting all the single pictures of an animation cycle myself i prefer to use ready-made sprite sheets.
-In the data folder, you will find a spritesheet((a graphic file with lot's of sprites)) from Ari Feldmann ( http://www.flyingyogi.com ) showing several pictures of an animal. If you use Ari's sprite's, make sure to include his [[en:resources:licenses:spritelib|license information]] into your program.
-With the help of pygame's subsurface command, i will show you how to extract single images from the sprite sheet and use them.
-==== discussion ====
-==== additional resources ====
-{{:en:part2:data008.tar.gz|}}
-==== source code ====
-<code python step008.py>
-# -*- coding: utf-8 -*-
-"""
-step008.py
-animation & spritesheet
-url: http://thepythongamebook.com/en:part2:pygame:step008
-author: horst.jens@spielend-programmieren.at
-spritesheet from
-http://www.flyingyogi.com
-"""
-import pygame
-import random
-import os
-pygame.init()
-screen=pygame.display.set_mode((800,480)) # try out larger values and see what happens !
-screenrect = screen.get_rect()
-background = pygame.Surface((screen.get_size()))
-backgroundrect = background.get_rect()
-background.fill((255,255,255)) # fill white
-background = background.convert()
-screen.blit(background,(0,0))
-# mypicture = pygame.image.load("picturefile.jpg") # simple method if picture in same folder
-folder = "data" # replace with "." if pictures lay in the same folder as program
-spritesheet = pygame.image.load(os.path.join(folder, "char9.bmp")).convert() # all in one line
-lions = [] # a list for the lion images
-# the spritesheet has lions, 128 x 64 pixels
-for nbr in range(1,5,1): # first line contains 4 picutres of lions
-   lions.append(spritesheet.subsurface((127*(nbr-1),64,127,127)))
-for nbr in range(5,7,1): # second line contains 2 pictures of lions
-   lions.append(spritesheet.subsurface((127*(nbr-5),262-64,127,127)))
-print "len:",len(lions)
-for nbr in range(len(lions)):
-   lions[nbr].set_colorkey((0,0,0)) # black transparent
-   lions[nbr] = lions[nbr].convert_alpha()
-   print "converted nbr", nbr
-for nbr in range(len(lions)):
-    screen.blit(lions[nbr], (nbr*127, 0))  #blit the ball surface on the screen (on top of background)
-    print "blitted nbr", nbr
-screen.blit(lions[nbr], (nbr*127, 0))  #blit the ball surface on the screen (on top of background)
-#screen.blit(lions[1], (x,
-clock = pygame.time.Clock()        #create pygame clock object
-mainloop = True
-FPS = 60                           # desired max. framerate in frames per second.
-playtime = 0
-cycletime = 0
-newnr = 0 # index of the first lionimage to display
-oldnr = 0 # needed to compare if image has changed
-interval = .15 # how long one single images should be displayed in seconds
-while mainloop:
-    milliseconds = clock.tick(FPS)  # milliseconds passed since last frame
-    seconds = milliseconds / 1000.0 # seconds passed since last frame (float)
-    playtime += seconds
-    cycletime += seconds
-    if cycletime > interval:
-        cycletime = 0
-        newnr += 1
-    picnr = int(newnr % 5) # the remainder of a division by 5, because 6 pictures are present (0...5)
-    mypicture = lions[picnr]
-    if newnr > oldnr:
-        #print "change to picture nr %i" % picnr
-        # clean dirty rec (a bit larger than original rect):
-        screen.blit(background.subsurface((300,300,128,66)),(300,300))
-        # blit new lion picture:
-        screen.blit(mypicture, (300,300))
-    oldnr = newnr # save oldnr
-    for event in pygame.event.get():
-        if event.type == pygame.QUIT:
-            mainloop = False # pygame window closed by user
-        elif event.type == pygame.KEYDOWN:
-            if event.key == pygame.K_ESCAPE:
-                mainloop = False # user pressed ESC
-    pygame.display.set_caption("[FPS]: %.2f picture: %i" % (clock.get_fps(), picnr))
-    #this would repaint the whole screen (secure, but slow)
-    #screen.blit(background, (0,0))     #draw background on screen (overwriting all)
-    pygame.display.flip()          # flip the screen 30 times a second
-print "This 'game' was played for %.2f seconds" % playtime
-</code>
-^ [[:en:part2:pygame:step007| ← previous]] ^ [[en:part2:pygame:start| ↑ Overview]] ^ [[:en:part2:pygame:step009| → next ]] ^

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