Screen Coordinates
- Author:
- Ryan Hirst
- Topic:
- Coordinates
I would like points that stay put on the screen. Here are some requirements:
-stay pinned to screen coordinates
-stay in the viewport
-they may be freely moved
-we may use them as reference points for other objects.
None of the methods in GGB meet these requirements (try it).
Why? (Hint: there is no such thing as absolute coordinates).
The points U1, V1, W1, Z1, however, do.
Procedure:
- imgWhite = (blank, 32×32 pixel image). Set ObjectProperties>Position>Corner1 to Corner[1]
- crn3 = Corner[imgWhite, 3]
- track the ratio Pixels/(GGB Unit): ppu = 32/x(crn3 - Corner[1])