/*!
    Creates a three part image based on the given side of the left and right caps.
    The center will be derived from the size in the middle.
*/
- (CPThreePartImage)threePartImageWithLeftCap:(int)leftCapWidth rightCap:(int)rightCapWidth;
{
    var context   = CGBitmapGraphicsContextCreate(),
        leftRect  = CGRectMake(0, 0, leftCapWidth, [self size].height),
        centRect  = CGRectMake(leftCapWidth, 0, [self size].width - leftCapWidth - rightCapWidth, [self size].height),
        rightRect = CGRectMake(centRect.size.width + leftCapWidth, 0, rightCapWidth, [self size].height),
        slices    = [];

    context.DOMElement.width = leftCapWidth;
    context.DOMElement.height = [self size].height;
    context.drawImage(self._image, leftRect.origin.x, leftRect.origin.y, leftRect.size.width, leftRect.size.height, 0, 0, leftRect.size.width, leftRect.size.height);

    [slices addObject:[[CPImage alloc] initWithContentsOfFile:context.canvas.toDataURL("image/png") size:leftRect.size]];

    context.DOMElement.width = centRect.size.width;
    context.drawImage(self._image, centRect.origin.x, centRect.origin.y, centRect.size.width, centRect.size.height, 0, 0, centRect.size.width, centRect.size.height);
    [slices addObject:[[CPImage alloc] initWithContentsOfFile:context.canvas.toDataURL("image/png") size:centRect.size]];

    context.DOMElement.width = rightRect.size.width;
    context.drawImage(self._image, rightRect.origin.x, rightRect.origin.y, rightRect.size.width, rightRect.size.height, 0, 0, rightRect.size.width, rightRect.size.height);
    [slices addObject:[[CPImage alloc] initWithContentsOfFile:context.canvas.toDataURL("image/png") size:rightRect.size]];

    return [[CPThreePartImage alloc] initWithImageSlices:slices isVertical:NO];
}
@end