Chapter 26 Introduction to Dynamic Blocks 793 Copyright Goodheart-Willcox Co., Inc. Now assign a scale action to the parameter. First, access the Scale action option and pick the SINK LENGTH linear parameter. Then select the objects to include in the scale action, including the associated parameter. Press [Enter] to assign the action. When using a scale action, it is critical to scale objects relative to the correct base point. Access the Properties palette and display the properties of the scale action. The Overrides category includes options for adjusting the base point. The default Base type option is Dependent, which scales the objects relative to the base point of the associated parameter. Select the Independent option to specify a different loca- tion. The Base X and Base Y values default to the parameter start point. Enter the coordinates relative to the block insertion base point, or use the pick button that appears when you select the Base X and Base Y values to select points on-screen. For the sink example, it is important that the objects be scaled relative to the exact center of the sink so that the sink will be centered within the vanity as the scale changes. Test and save the block, and exit the Block Editor. The dynamic block is now ready to use. PROFESSIONAL TIP P R OFESSIONAL TIP In the previous example, the Independent option allows you to set the center of the sink as the base point for the scale action. This is necessary because the base point of the linear parameter is not the specifi ed midpoint. The parameter uses a midpoint base to scale the parameter and parameter grips from the parameter midpoint. The Independent option of the scale action controls the point from which the geometry, not the parameter, is scaled. Using a Scale Action Dynamically Figure 26-16 shows using the right grip or dynamic input to scale the sink in the vanity block reference. You can use either grip to scale the sink. You can also use the Properties palette to defi ne the distance. Exercise 26-4 www.g-wlearning.com/CAD/ Complete the exercise on the companion website. Ribbon Block Editor Action Parameters Scale Type BACTIONTOOL Scale Figure 26-15. A linear parameter assigned to the sink objects in a block of a vanity with a sink. Locate the parameter base point and independent base type at the center of the sink to scale the sink symmetrically. Sink Quadrant Linear parameter Use the Base option to set the midpoint Countertop