Methods


backImage
bufImage
refreshScreen
loadPPMFile:toImage:
destroyImage:
lockBuf
lockAndClearBuf
unlockBuf
dispatchEvents
getTimeMillis
free

backImage

- ( SpriteImage *) backImage;

Returns the image used as a background (used to clear the back buffer after each frame).


bufImage

- ( SpriteImage *) bufImage;

Returns the image used as a back buffer. Sprites render themselves onto this image and then it is displayed on the screen on each frame update.


destroyImage:

- ( void ) destroyImage:
        (SpriteImage *) si;

Destroys the data associated with the SpriteImage si. Does not free the structure itself.


dispatchEvents

- ( id ) dispatchEvents;

Gets any pending events from the windowing system's event queue, and sends them as messages back to the host SpriteApp object, which then invokes its handlers for the events.


free

- free;

Releases the IODelegate object.


getTimeMillis

- ( unsigned int ) getTimeMillis;

Gets the time since the application started in milliseconds. For a 32-bit unsigned int, this value will wrap around once every 49.7 days.


loadPPMFile:toImage:

- ( int ) loadPPMFile:
        (char *) fn toImage:
        (SpriteImage *) si;

Loads a PPM file given by filename fn; converts it into a SpriteImage suitable for rendering on the back buffer, and stores the data in the structure pointed to by si.


lockAndClearBuf

- ( void ) lockAndClearBuf;

Locks the backbuffer image so that it may be drawn upon, and overwrites it with the background image.


lockBuf

- ( void ) lockBuf;

Locks the backbuffer image so that it may be drawn upon.


refreshScreen

- ( void ) refreshScreen;

Write back buffer image to screen.


unlockBuf

- ( void ) unlockBuf;

Unlocks the backbuffer image after a previous call to lockBuf.

(Last Updated 7/27/2005)