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- Comments about CLOCK
-
- The program illustrates various Gpi calls. It starts a timer
- which sends it WM_TIMER messages once per second. DosGetDateTime
- returns the system time. The various graphical parts of the clock
- face (face, hour hand, minute hand, second hand, major ticks, minor
- ticks), are each drawn by setting the model transform and then
- drawing the part in an unchanging location in world space. Once per
- minute, the clock is drawn from scratch. The second hand is drawn
- in XOR mode, so it can be redrawn in its old location (effectively
- erasing it) and then drawn in its new location, without requiring
- that the whole clock be redrawn.
-
- Under "Preferences", if you select "Hide Frame Controls", all windows
- but the client window and the size border disappear. You can
- restore them by double-clicking on the clock window, or by typing
- any keyboard character when the clock window has the focus.
-