Applies or persists
geometric relationships between objects or points on objects.
Summary
When you apply a geometric constraint to a pair
of objects, the order in which the objects are selected and the
point on which each object is selected can affect how the objects
are positioned relative to each other.
The following table outlines
the valid constraint points for an object.
Objects
|
Valid Constraint Points
|
Line
|
Endpoints, midpoint
|
Arc
|
Center, endpoints, midpoint
|
Spline
|
Endpoints
|
| Circle |
Center
|
Ellipse
|
Center, major and minor
axes
|
Polyline
|
Endpoints, midpoints
of line and arc subobjects, center of arc subobjects
|
Xref, attribute, table
|
Insertion point
|
Block
|
Insertion point, nested
entities
|
Text, multiline text
|
Insertion point, alignment
point
|
The following commands
are equivalent to each GEOMCONSTRAINT option:
- Horizontal (GCHORIZONTAL)
-
Causes lines or pairs
of points to lie parallel to the X axis of the current coordinate
system.
- Vertical (GCVERTICAL)
-
Causes lines or pairs
of points to lie parallel to the Y axis of the current coordinate
system.
- Perpendicular (GCPERPENDICULAR)
-
Causes selected lines
to lie 90 degrees to one another.
- Parallel (GCPARALLEL)
-
Causes selected lines
to lie parallel to each other.
- Tangent (GCTANGENT)
-
Constrains two curves
to maintain a point of tangency to each other or their extensions.
- Smooth (GCSMOOTH)
-
Constrains a spline
to be contiguous and maintain G2 continuity with another spline,
line, arc, or polyline.
- Coincident (GCCOINCIDENT)
-
Constrains two points
together or a point to a curve (or an extension of a curve).
- Concentric (GCCONCENTRIC)
-
Constrains two arcs,
circles, or ellipses to the same center point.
- Collinear (GCCOLLINEAR)
-
Causes two or more line
segments to lie along the same line.
- Symmetric (GCSYMMETRIC)
-
Causes selected objects
to become symmetrically constrained about a selected line.
- Equal (GCEQUAL)
-
Resizes selected arcs
and circles to the same radius, or selected lines to the same length.
- Fix (GCFIX)
-
Locks points and curves
in position.
