# GEOMCONSTRAINT Command [GstarCAD 2027](Help%20System/GSTARCAD/2027/Index.md) → [Commands](Help%20System/GSTARCAD/2027/Commands/(Commands).md) → [G](Help%20System/GSTARCAD/2027/Commands/G/(G).md) ## Function Description: Applies geometric relationships between objects or between points on objects, or maintains these relationships permanently. When applying geometric constraints to a pair of objects, the order in which you select the objects and the points on each object can affect how the objects are positioned relative to each other. ## Command Access: Icon: / Menu Item: / Function Area: / Toolbar: / Command Line: GEOMCONSTRAINT Command Alias:/ ## Command Prompts: ``` Enter constraint type [Horizontal (H) / Vertical (V) / Perpendicular (P) / Parallel (PA) / Tangent (T) / Smooth (SM) / Coincident (C) / Concentric (CON) / Collinear (COL) / Symmetric (S) / Equal (E) / Fixed (F)] <Horizontal>: Each branch option of this command is equivalent to each of the separate commands 1-12. ``` **The following commands are equivalent to each GEOMCONSTRAINT option:** ## GCCOINCIDENT Constrains two points to coincide or a point to lie on a curve (or the curve's extension). ## GCCOLLINEAR Aligns two or more line segments to be in the same straight line direction. ## GCCONCENTRIC Constrains two arcs, circles, or ellipses to share the same center point. ## GCFIX Locks a point or a curve in place, preventing it from moving. ## GCPARALLEL Makes selected lines parallel to each other. ## GCPERPENDICULAR Positions selected lines at right angles to each other. ## GCHORIZONTAL Aligns a line or a pair of points to be parallel to the X-axis of the current coordinate system. ## GCVERTICAL Aligns a line or a pair of points to be parallel to the Y-axis of the current coordinate system. ## GCTANGENT Constrains two curves to be tangent to each other or their extensions to be tangent. ## GCSYMMETRIC Applies symmetry constraint to selected objects relative to a selected line. ## GCSMOOTH Constrains a spline curve to be continuous and maintain G2 continuity with other spline curves, lines, arcs, or polylines. ## GCEQUAL Adjusts the size of selected arcs and circles to have the same radius, or adjusts the size of selected lines to have the same length. --- [Original help](https://www.gstarcad.net/help/GstarCAD_2027_en-US/detail/commandReferences_G/GEOMCONSTRAINT.html) · © Gstarsoft Co., Ltd.