Fun with vectors.

[plenderj]

To convert from the normal computer's co-ordinates system to cartesian co-ordinates, just add half the window width to the x co-ords, and half the window height to the y co-ords.

You may also wanna check out my game in thread :
http://forums.vb-world.net/showthread.php?s=&threadid=56233

You might get some ideas from it...

- jamie

[Zero]

Perfect. Thanks.

[HarryW]

Oops, just realised a mistake - I meant "x increases to the right". Looks like you're sorted though, so no worries.