Overview of Geometric Constraints

You can specify geometric constraints between 2D objects or points on objects. When you later edit the constrained geometry, the constraints are maintained.

Thus, using geometric constraints, you have a method of including design requirements in your drawing.

For example, in the illustration below, the following constraints are applied to the geometry.

Every endpoint is constrained to remain coincident with the endpoint of every adjacent object—these constraints are displayed as small blue squares
The vertical lines are constrained to remain parallel with each other and to remain equal to each other in length
The left vertical line is constrained to remain perpendicular to the horizontal line
The horizontal line is constrained to remain horizontal
The location of the circle and the horizontal line are constrained to remain fixed in space—these constraints are displayed as lock icons
NoteThe locked geometry is not associated to the other geometry without geometric constraints linked to it.

The geometry is not fully constrained, however. Using grips, you can still change the radius of the arc, the diameter of the circle, the length of the horizontal line, and the length of the vertical lines. To specify these distances, you need to apply dimensional constraints.

NoteConstraints can be added to segments within a polyline as if they were separate objects.