Yellow Dot Green Dot Constraints
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When doing a sketch yellow snap nodes are not constraints, whereas green snap nodes are constraints.
A circle with a center snapped off the origin (becomes a yellow node), maybe on a axis, can be moved. These are called "soft snaps".
A circle with a center snapped on the origin (becomes a green node), cannot be moved. Snapped to green are called "hard snaps" because the object cannot be moved afterwards.
Text, images and diagrams © 2021 Owen F. Ransen. All rights reserved. (But copy the source code as much as you want!)