Nearly done

After much messing about trying to calculate the correct section of image to cut out I finally managed to get it working on one specific object and best of all I can have objects overlapping as much as they like and it still looks correct. Next is to make it so only objects that have changed are redrawn and I can carry on and look to porting it to OpenGL. As I said before, I can hopefully do away with the expensive sorting algorithm with costs N*N-1 (N=Number of objects) checks to correctly sort everything without the danger of overdraw. I was going to use a double linked list instead of the dynamic array that I've got at the minute but it was taking a long time to get right and kept throwing up bugs when it came to swapping objects around. I guess that's the danger of linked lists, you either get them right or leave well alone. Trouble with the new method is it's fine for the one object I've been testing but if I make all objects use the same method it slows stuff down way too much which is why it's so important only certain objects get a redraw. Guess I'll do the "dirty" object stuff next then make all objects use the same method.