Constructing a SPDisplayObject

gistfile1.m

/* My character class handles switching animation frames based on time, whether it's
   walking, and what direction it's facing. When the time comes to render, it returns
   an SPImage set up like this.
*/

@interface Character : NSObject
{
    SPImage *_image; // Generic image sprite
    NSMutableArray *_frames; // array of texture frames
    int _facing; // North, south, east or west
    int _frameNumber;
    CGPoint _position; // Where in the world is the character
    CGSize _size; // width/height to draw at
    ...
}
@end

@implementation Character
- (SPDisplayObject*)displayObject
{
    int frameNumber;
    
    if (_laughing) {
        frameNumber = _currentFrame + kLaughIndex;
    } else {
        frameNumber = _currentFrame + ((int)_facing * 4);
    }
    _image.texture = (SPTexture*)[_frames objectAtIndex:frameNumber];
    
    _image.x = _position.x;
    _image.y = _position.y;
    
    _image.width = _size.width;
    _image.height = _size.height;

    // I want the characters drawn with the center of the character at their
    // x position, so I need to muck with the _image's pivot point.
    _image.pivotX = _size.width / 2.0f;
    _image.pivotY = _size.height;
    
    return _image;
}
@end