Parametric Drawing Powerful new parametric drawing functionality in AutoCAD 2010 enables you to dramatically increase productivity by constraining drawing objects based on design intent. Geometric and dimensional constraints help ensure that specific relationships and measurements remain persistent even as objects are modified. The tools for creating and managing geometric and dimensional constraints are available on the Parametric ribbon tab, which is automatically displayed in the 2D Drafting and Annotation workspace. Figure 1. Parametric ribbon tab Establishing Geometric Relationships Geometric constraints establish and maintain geometric relationships between objects, key points on objects, or between an object and the coordinate system. Pairs of key points on or between objects can also be constrained to be vertical or horizontal relative to the current coordinate system. For example, you could specify that two circles must always be concentric, that two lines are always parallel, or that one side of a rectangle is always horizontal.Applying Geometric Constraints Geometric relationships are defined with geometric constraints, located on the Geometric Panel of the Parametrictab of the ribbon, or with the GEOM CONSTRAINT command. When applying constraints, an icon appears next to the cursor to help you remember which constraint you selected. Figure 2. Concentric geometric constraint icon When applying a constraint to points, a temporary marker identifies the closest valid point when rolling over an object. It generally corresponds with points that can be used as object snaps. Whether selecting objects or points on objects to constrain, the order and pick location affects how the objects update: the second object selected updates to satisfy the constraint. After the constraint is applied, though,either object will update when the other is modified. Figure 3. Applying a parallel constraint Figure 4. Applying a coincident constraint Figure 5. Applying a concentric constraint AutoConstrain You can significantly automate the process ofapplying constraints using the AutoConstrain functionality,available on the Geometric panel of the Parametric tab. Auto Constrain automatically applies constraints to geometry that falls within specified tolerances. For example, applying Auto Constrain to a rectangle consisting of four lines generates the appropriate coincident, horizontal, parallel, and perpendicular constraints to maintain the rectangular shape through various edits. You can control which constraints are available, in what order they are applied, and a tolerance to determine whether constraints are automatically applied. These controls are available on the Auto Constrain tab of the Constraint Settings dialog box, which you can access from the Parametric tab or using the CONSTRAINT SETTINGS command.
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