Changing point color?

Continuing the discussion from Making a Polygon Disappear:

For the next slide I don’t want to fill the circle with triangles. It would be cleaner if the movable point could change color or give some other indication that it’s in the correct location. Ideas?

Make multiple polygons that conditionally display (i.e. put restrictions)

Can a polygon have only one point?

As far as the polygon function is concerned, yes.

Thanks for reading between the lines. That’s exactly what I meant. I appreciate your help!