While creating a sketch, the user should be able to add constraints between parts, adjust the values that constraints try to uphold, and create relationships between constraints. We could imply that the line’s length is constrained or not by varying the rendering style (eg dashed vs solid vs wiggly), or by varying whether or not the line overshoots the points. This is not a problem if there’s only one gizmo showing at a time, but we wanted to show lots of gizmos (eg: so that you could easily wire from one gizmo to another).