1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
|
import sys
import sdl2
import sdl2.ext
# Create a resource container, so that we can easily access all
# resource, we bundle with our application. We are using the current
# file's location and define the "resources" subdirectory as the
# location, in which we keep all data.
RESOURCES = sdl2.ext.Resources(__file__, "resources")
def run():
# Initialize the video subsystem, create a window and make it visible.
sdl2.ext.init()
window = sdl2.ext.Window("Sprite Transformations", size=(800, 600))
window.show()
# Create a hardware-accelerated sprite factory. The sprite factory requires
# a rendering context, which enables it to create the underlying textures
# that serve as the visual parts for the sprites.
renderer = sdl2.ext.Renderer(window)
factory = sdl2.ext.SpriteFactory(sdl2.ext.TEXTURE, renderer=renderer)
# Create a simple rendering system for the window. We will use it to
# display the sprites.
rendersystem = factory.create_sprite_render_system(window)
# Create the sprite to display.
sprite = factory.from_image(RESOURCES.get_path("hello.bmp"))
# Use the sprite.center tuple to change the center of the sprite for
# rotation. You can reset a changed center simply by assinging None to it.
#
# sprite.center = 10, 30 # Changes the center
# sprite.center = None # Resets the center
running = True
while running:
events = sdl2.ext.get_events()
for event in events:
if event.type == sdl2.SDL_QUIT:
running = False
break
elif event.type == sdl2.SDL_KEYDOWN:
# Flip the sprite over its vertical axis on pressing down or up
if event.key.keysym.sym in (sdl2.SDLK_DOWN, sdl2.SDLK_UP):
sprite.flip ^= sdl2.SDL_FLIP_VERTICAL
# Flip the sprite over its horizontal axis on pressing left or
# right
elif event.key.keysym.sym in (sdl2.SDLK_LEFT, sdl2.SDLK_RIGHT):
sprite.flip ^= sdl2.SDL_FLIP_HORIZONTAL
# Rotate the sprite around its center on pressing plus or
# minus. The center can be changed via sprite.center.
elif event.key.keysym.sym == sdl2.SDLK_PLUS:
sprite.angle += 1.0
if sprite.angle >= 360.0:
sprite.angle = 0.0
elif event.key.keysym.sym == sdl2.SDLK_MINUS:
sprite.angle -= 1.0
if sprite.angle <= 0.0:
sprite.angle = 360.0
renderer.clear()
rendersystem.render(sprite, 100, 75)
sdl2.SDL_Delay(10)
sdl2.ext.quit()
return 0
if __name__ == "__main__":
sys.exit(run())
|
