I badly know English language, I will ask therefore questions shortly:
1. Why there are no such bindings, how the Middle (for example, to the middle of a line), Centre (for example, centre of a circle or a square), the Perpendicular?
2. Why there is auxiliary geometry, for example, no guide lines?
3. I want to learn to write plug-ins to the program solidThinking, but I can not find PDK anywhere (Plugins Development Kit).
Thanks.