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"""The almighty Hello World! example"""
# We'll use sys to properly exit with an error code.
import sys
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 system - this implicitly initializes some
# necessary parts within the SDL2 DLL used by the video module.
#
# You SHOULD call this before using any video related methods or
# classes.
sdl2.ext.init()
# Create a new window (like your browser window or editor window,
# etc.) and give it a meaningful title and size. We definitely need
# this, if we want to present something to the user.
window = sdl2.ext.Window("Hello World!", size=(592, 460))
# By default, every Window is hidden, not shown on the screen right
# after creation. Thus we need to tell it to be shown now.
window.show()
# Create a sprite factory that allows us to create visible 2D elements
# easily. Depending on what the user chosses, we either create a factory
# that supports hardware-accelerated sprites or software-based ones.
# The hardware-accelerated SpriteFactory requres a rendering context
# (or SDL_Renderer), which will create the underlying textures for us.
if "-hardware" in sys.argv:
print("Using hardware acceleration")
renderer = sdl2.ext.Renderer(window)
factory = sdl2.ext.SpriteFactory(sdl2.ext.TEXTURE, renderer=renderer)
else:
print("Using software rendering")
factory = sdl2.ext.SpriteFactory(sdl2.ext.SOFTWARE)
# Creates a simple rendering system for the Window. The
# SpriteRenderSystem can draw Sprite objects on the window.
spriterenderer = factory.create_sprite_render_system(window)
# Creates a new 2D pixel-based surface to be displayed, processed or
# manipulated. We will use the one of the shipped example images
# from the resource package to display.
sprite = factory.from_image(RESOURCES.get_path("hello.bmp"))
# Display the surface on the window. This will copy the contents
# (pixels) of the surface to the window. The surface will be
# displayed at surface.position on the window. Play around with the
# surface.x and surface.y values or surface.position (which is just
# surface.x and surface.y grouped as tuple)!
spriterenderer.render(sprite)
# Set up an example event loop processing system. This is a necessity,
# so the application can exit correctly, mouse movements, etc. are
# recognised and so on. The TestEventProcessor class is just for
# testing purposes and does not do anything meaningful. Take a look
# at its code to better understand how the event processing can be
# done and customized!
processor = sdl2.ext.TestEventProcessor()
# Start the event processing. This will run in an endless loop, so
# everything following after processor.run() will not be executed
# before some quitting event is raised.
processor.run(window)
# We called video.init(), so we have to call video.quit() as well to
# release the resources hold by the SDL DLL.
sdl2.ext.quit()
return 0
if __name__ == "__main__":
sys.exit(run())
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