Quick Start

Note: Some inferences produce temporary constraints that are only available
when creating a particular entity. They are not persisted and cannot be added,
removed or changed. See Sketch Constraints on page 169 for more information.
Some types of inferences are dependent on “touching” other Sketch entities
with your mouse when in the middle of creating a new Sketch entity. For
example, if you are moving your mouse when creating a line, and move it
over a point or another line, the command remembers that you “touched”
those entities and they now become reference entities for your currently active
Sketch command. Touching a point or curve itself results in an inference.
Here is a list of inferences that are picked up and displayed to you through
some graphical symbol. The number in parenthesis next to the inference name
indicates the priority given to that inference, with 1 being the highest priority.
Geometry Inferences
Geometry inferences are displayed when your mouse is over some key geometry
points.
■ Coincident Point Inference (1):
If your cursor touches an existing Sketch point, you see a red square symbol.
If the point happens to be the center of a circle or circular arc, then you
see a red circle instead of a red square. If you click your mouse when you
see this inference, your new point is guaranteed to coincide with the
inferred point.
■ Point On Curve Inference(2):
Sketch | 163