Applies constraint parameters to selected objects, or converts dimensional constraints to parameter constraints.
The BCPARAMETER command is used in the Block Editor. This command applies a constraint parameter to an object or between constraint points on object(s).
The following prompts are displayed.
Creates a horizontal or vertical constraint parameter based on the locations of the extension line origins and the location of the dimension line similar to the DIMLINEAR command.
Selects an object instead of a constraint point. Press Enter or click the dropdown list to select the object.
Constrains the X distance of a line or between two points on different objects. Valid objects include lines and polyline segments.
Selects an object instead of a constraint point. Press Enter or click the dropdown list to select the object.
Constrains the Y distance of a line or between two points on different objects. Valid objects include lines and polyline segments.
Selects an object instead of a constraint point. Press Enter or click the dropdown list to select the object.
Constrains the length of a line or the distance between two lines, a point on an object and a line, or two points on different objects.
Selects a point and a line object. The aligned constraint controls the distance between a point and the closest point on a line.
Selects two line objects. The lines are made parallel and the aligned constraint controls the distance between the two lines.
Constrains the angle between two lines or polyline segments. It is similar to an angular dimension.
Selects three valid constraint points on the object.
Valid Objects or Points  Characteristics 


When you enter or edit an angle value that is either negative or is greater than 360 degrees, the number entered is stored for the expression (for example, 390), but the value displayed is based on the formatting of the units (for example, 30 if decimal degrees).
When an expression with variables evaluates to greater than 360 or less than 360, the constraint value is displayed in the Parameters Manager palette based on the units of the drawing.
Creates a radial constraint parameter for a circle, arc, or polyline arc segment.
Valid Object or Points  Characteristics 

Circle  Constrains the radius of the circle or arc. 
Arc 
Creates a diameter constraint parameter for a circle, arc, or polyline arc segment.
Valid Object or Points  Characteristics 

Circle  Constrains the diameter of the circle or arc. 
Arc 
Converts the dimensional constraints to constraint parameters.
Objects other than dimensional constraints are ignored and filtered from the selection set.