Lays out a number of rects of given aspect ratio in a given frame.

GridLayout.m

- (void)drawGridWithFrame:(CGRect)rect containing:(int)numSquares squaresOfAspectRatio:(float)aspectRatio margin:(float)margin addToArray:(NSMutableArray *)array {
	
	float totalArea = rect.size.width * rect.size.height;
	float areaPerSquare = floorf(totalArea / numSquares);
	float height = sqrtf(areaPerSquare/aspectRatio);
	CGSize squareSize = CGSizeMake(aspectRatio * height, height);
	int numPerRow = (int)floorf(rect.size.width / squareSize.width);
	int numPerCol = (int)floorf(rect.size.height / squareSize.height);
	
	if (numPerCol * numPerRow < numSquares) {
		int numForWidthExp = (numPerRow + 1) * numPerCol;
		int numForHeightExp = numPerRow * (numPerCol + 1);
		if ((numForWidthExp >= numForHeightExp || numForHeightExp < numSquares) && numForWidthExp >= numSquares)
			numPerRow++;
		else if (numForHeightExp >= numSquares)
			numPerCol++;
		else {
			numPerCol++;
			numPerRow++;
		}
	}
	
	float rectWidthMargin = 0.0;
	float rectHeightMargin = 0.0;
	
	float widthStretchFactor = (rect.size.width / (float)numPerRow) / squareSize.width;
	
	if ((widthStretchFactor * squareSize.height) * numPerCol < rect.size.height) {
		squareSize = CGSizeMake(squareSize.width * widthStretchFactor, squareSize.height * widthStretchFactor);
		rectHeightMargin = (rect.size.height - (squareSize.height * numPerCol)) / 2.0;
	} else {
		float heightStretchFactor = (rect.size.height / (float)numPerCol) / squareSize.height;
		squareSize = CGSizeMake(squareSize.width * heightStretchFactor, squareSize.height * heightStretchFactor);
		rectWidthMargin = (rect.size.width - (squareSize.width * numPerRow)) / 2.0;
	}

		
		
	
	int index = 0;
	
	for (int y = 0; y < numPerCol; y++) {
		for (int x = 0; x < numPerRow; x++) {

			ccColor4B color = (ccColor4B){rand() % 255, rand() % 255, rand() % 255, 255};
			int width = (int)floorf(squareSize.width - (2.0 * margin));
			int height = (int)floorf(squareSize.height - (2.0 * margin));
			
			CCColorLayer *layer = [CCColorLayer layerWithColor:color width:width height:height];
			
			float xPos = rect.origin.x + rectWidthMargin + (squareSize.width * x) + margin;
			float yPos = (rect.origin.y + rect.size.height -  + rectHeightMargin) - ((squareSize.height * (y + 1)) + margin);
			
			layer.position = ccp(xPos, yPos);
			
			[self addChild:layer];
			
			if (nil != array)
				[array addObject:layer];
			
			index++;
			
			if (index >= numSquares)
				break;
		}					   
		
		if (index >= numSquares)
			break;
	}
	
}