Quick Start

circle, a Tangent constraint is inferred. You see a red circle symbol with a
red line drawn tangent to it.
If you actually clicked the point on the circle before moving your mouse,
your first point is fixed and you only infer this constraint when you move
your mouse in a direction roughly tangential to the circle at your picked
point.
However, if you pressed your mouse left button on the circle (without
releasing it) and dragged the mouse in a direction tangential to the circle,
your first point is not fixed. You can drag the mouse in any direction and
your line adjusts to remain tangential to the circle. Releasing the mouse
will define both points of your line simultaneously. This behavior is not
limited by the bounds of an arc – it will exist for the entire logical circle
that the arc is a part of.
■ Perpendicular Constraint Inference (3):
This is very similar to the Tangent Constraint, except that it is inferred
when you move/drag in a direction perpendicular to the circle or circular
arc.
■ Horizontal Constraint Inference (4):
166 | Chapter 1 Autodesk Inventor Fusion TP2