ok here we go:

Code:
if &#40;links&#41; AND &#40;angle < 360&#41; then angle &#58;= angle +1;
if &#40;rechts&#41; AND &#40;angle > 0&#41; then angle &#58;= angle -1;

if &#40;links&#41; AND &#40;angle = 360&#41; then angle &#58;= 0;
if &#40;rechts&#41; AND &#40;angle = 0&#41; then angle &#58;= 360;

links & rechts are checked in OnKeyDown links is true if VK_LEFT is pressed and rechts if VK_RIGHT..
(Undone in OnKeyUp)