GCHORIZONTAL command
Creates a horizontal geometric constraint on 2D entities.
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Description
Creates a horizontal constraint to ensure a linear entity or pair of points remains parallel to the x-axis.
Methods to create a horizontal constraint
This command has 2 methods to begin creating a horizontal constraint:
         - Select an entity
 - 2 Points
 
- Select an entity
 - Create a horizontal constraint by selecting a linear entity to make parallel to the x-axis.
 - 2 Points
 - Begin creating a horizontal constraint by specifying the first point to make parallel to the x-axis then:
 - Select Second Point:
 - Specify the second point to make horizontal to the x-axis. The first point maintains its position while the second point moves to become horizontal with the first point.