Get vertical beam position at this instant.
Source position: agraphics.pas line 2106
function VBeamPos: LongInt; |
interrogates hardware for beam position and returns value. valid results in are the range of 0-511. Because of multitasking, the actual value returned may have no use. If you are the highest priority task then the value returned should be close, within 1 line.
This function isn't implemented on all platforms.