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This page was last modified on 11 July 2009, at 20:40.

Como fazer animações sem bloqueio usando sprites

From Forum Nokia Wiki


ID Creation date March 11, 2009
Platform S60 1st Edition, S60 2nd Edition, S60 3rd Edition Tested on devices Nokia N95
Category Python Subcategory


Keywords (APIs, classes, methods, functions): Animação, sprite

Aqui está um exemplo simples de como fazer animações usando sprites no PyS60. Este exemplo não bloqueia a thread principal porque ele usa a função assíncrona e32.ao_sleep.

Nesse exemplo, nós usaremos a imagem sequencial do peixe mostrada abaixo:

Image:Sprite.GIF

Pode-se usar qualquer imagem sequencial nesse exemplo. Basta alterar as constantes IMAGE_LOCATION, FRAME_WIDTH, FRAME_HEIGHT, SEQUENCE, POS_X, POS_Y e DELAY

As constantes FRAME_WIDTH e FRAME_HEIGHT são a largura e a altura de cada quadro da imagem, como mostrado a seguir.

Image:Fish.png

A constante SEQUENCE é uma lista de inteiros que determna a sequência de aparecimento de cada quadro como mostrado na imagem acima. POS_X e POS_Y são oa posição em que a animação aparecerá na tela.

import appuifw, graphics, e32, sysinfo
 
IMAGE_LOCATION = "c:\\python\\sprite.GIF"
FRAME_WIDTH = 35
FRAME_HEIGHT = 33
SEQUENCE = [0, 1, 2, 3, 2, 1]
POS_X = 50
POS_Y = 50
DELAY = 0.2
 
def handle_redraw(rect):
if img:
canvas.blit(img)
 
def quit():
running = 0
lock.signal()
 
lock = e32.Ao_lock() #Cria um lock
display_size = sysinfo.display_pixels() #Obtem o tamanho da tela
appuifw.app.screen = 'full' #Configura a aplicação para fullscreen
img = graphics.Image.new(display_size) #Cria uma imagem de base
canvas = appuifw.Canvas(redraw_callback=handle_redraw) #cria um canvas
appuifw.app.body = canvas #Atribui o canvas como sendo o corpo da aplicação
sprite_image = graphics.Image.open(IMAGE_LOCATION) #Carrega a imagem sequencial
appuifw.app.exit_key_handler = quit #Configura a função de saída
 
running = 1
count = 0
 
def animation():
global count
img.clear(0)
img.blit(sprite_image,
target = (POS_X, POS_Y),
source = ((SEQUENCE[count]*FRAME_WIDTH,0),
(FRAME_WIDTH*(1+SEQUENCE[count]), FRAME_HEIGHT)))
handle_redraw(())
 
if count < len(SEQUENCE) - 1:
count += 1
else:
count = 0
 
if running:
#Chama a função de animação depois de DELAY segundos sem bloquear
e32.ao_sleep(DELAY, animation)
 
animation()
lock.wait()

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