# Parametric (dimensional constraints) [GstarCAD 2027](Help%20System/GSTARCAD/2027/Index.md) → [What's new](Help%20System/GSTARCAD/2027/What's%20new/(What's%20new).md) Parametric (Dimensional Constraints) is a powerful tool for controlling the size and position relationships of graphics objects, ensuring that the size and shape of graphics remain consistent during editing. Including: 1) 7 kinds of dimensional constraints, respectively: linear, horizontal, vertical, aligned, angular, radius, diameter; 2) 2 kinds of auxiliary functions: form, convert. **This feature is only available in****Premium****version.** ## Add the following parametric constraint-related commands: 1、[DIMCONSTRAINT (GstarCAD 2026)](../../2026/Commands/D/DIMCONSTRAINT%20Command.md) Controls the size and position relationships of graphics objects, ensuring that the size and shape of graphics remain consistent during editing. 2、[DCLINEAR (GstarCAD 2026)](../../2026/Commands/D/DCLINEAR%20Command.md) Constrains the horizontal or vertical distance between two points. 3、[DCHORIZONTAL (GstarCAD 2026)](../../2026/Commands/D/DCHORIZONTAL%20Command.md) Constrains the X distance between points on an object, or between two points on different objects. 4、[DCVERTICAL (GstarCAD 2026)](../../2026/Commands/D/DCVERTICAL%20Command.md) Constrains the Y distance between points on an object, or between two points on different objects. 5、[DCALIGNED (GstarCAD 2026)](../../2026/Commands/D/DCALIGNED%20Command.md) Constrains the distance between two points on an object or between two points on different objects. 6、[DCANGULAR (GstarCAD 2026)](../../2026/Commands/D/DCANGULAR%20Command.md) Constrains the angle between line or polyline segments, the angle swept out by an arc or a polyline arc segment, or the angle between three points on objects. 7、[DCRADIUS (GstarCAD 2026)](../../2026/Commands/D/DCRADIUS%20Command.md) Constrains the radius of a circle or an arc. 8、[DCDIAMETER (GstarCAD 2026)](../../2026/Commands/D/DCDIAMETER%20Command.md) Constrains the diameter of a circle or an arc. 9、[DCFORM (GstarCAD 2026)](../../2026/Commands/D/DCFORM%20Command.md) Specifies whether the dimensional constraint being created is dynamic or annotational. 10、[DCCONVERT (GstarCAD 2026)](../../2026/Commands/D/DCCONVERT%20Command.md) Converts associative dimensions to dimensional constraints. 11、[DCDISPLAY (GstarCAD 2026)](../../2026/Commands/D/DCDISPLAY%20Command.md) Displays or hides the dynamic constraints associated with a selection set of objects. 12、[CONSTRAINTSETTINGS (GstarCAD 2026)](../../2026/Commands/C/CONSTRAINTSETTINGS%20Command.md) Controls the display of geometric constraints within the CAD software. 13、[PARAMETERS (GstarCAD 2026)](../../2026/Commands/P/PARAMETERS%20Command.md) Controls the associative parameters used in the drawing. ## Added parametric constraint related system variables: 1、[CCONSTRAINTFORM (GstarCAD 2026)](Help%20System/GSTARCAD/2026/System%20Variables/C/CCONSTRAINTFORM%20System%20Variable.md) Controls which to be applied to objects, the annotative constraint or dynamic constraint. 2、[CONSTRAINTNAMEFORMAT (GstarCAD 2026)](Help%20System/GSTARCAD/2026/System%20Variables/C/CONSTRAINTNAMEFORMAT%20System%20Variable.md) Controls the text format of labeled constraints in the CAD software. 3、[DIMCONSTRAINTICON (GstarCAD 2026)](Help%20System/GSTARCAD/2026/System%20Variables/D/DIMCONSTRAINTICON%20System%20Variable.md) Controls the display of the lock icon for dimensional constraints. 4、[DYNCONSTRAINTMODE (GstarCAD 2026)](Help%20System/GSTARCAD/2026/System%20Variables/D/DYNCONSTRAINTMODE%20System%20Variable.md) Displays hide dimension constraint when selected constrained objects. 5、[PARAMETERCOPYMODE (GstarCAD 2026)](Help%20System/GSTARCAD/2026/System%20Variables/P/PARAMETERCOPYMODE%20System%20Variable.md) Controls how to deal with constrains and users parameters of reference when copying constrained objects between drawing, model space, and layouts, and block definitions. 6、[PARAMETERSSTATUS (GstarCAD 2026)](Help%20System/GSTARCAD/2026/System%20Variables/P/PARAMETERSSTATUS%20System%20Variable.md) Specifies whether the parameter manager is displayed or hidden. --- [Original help](https://www.gstarcad.net/help/GstarCAD_2027_en-US/detail/GstarCAD2026NEW/GUG_NewFunction2026_dimensionalconstraints.html) · © Gstarsoft Co., Ltd.