Chapter 26 Introduction to Dynamic Blocks 801 Copyright Goodheart-Willcox Co., Inc. Flip Parameters Flip P a r a meter s A fl ip parameter creates a fl ip property to which you can assign a fl ip action. For example, assign a fl ip parameter with a fl ip action to a door symbol to provide the option to place the door on either side of a wall. Another example is using a fl ip param- eter to control the side of a reference line on which a weld symbol appears for arrow side or other side applications. Figure 26-25 shows an example of adding a fl ip parameter. Access the Flip param- eter option and pick the base point, followed by the endpoint of the refl ection line. See Figure 26-25A. Pick a location for the parameter label, and then enter the number of grips to associate with the parameter. The default 1 option creates a single fl ip grip that allows you to use grip editing to carry out the fl ip action. Flipping a block mirrors the block over the refl ection line. However, for the door symbol, with the line in the position shown in Figure 26-25A, an incorrect fl ip will result when you fl ip the block to the other side of a wall. To mirror the block properly, you must locate the refl ection line to account for wall thickness. To place the door on a 4″ wall, for example, use the MOVE command to move the refl ection line 2″ lower than the door. The label and parameter grip also move. In addition, move the parameter grip horizontally to the middle of the door opening to help place and fl ip the block properly. See Figure 26-25B. NOTE NOTE Name, Label, Description, and Palette options are available before you specify the parameter. Most of these options are also available from the Properties palette if you have already created the parameter. PROFESSIONAL TIP P R OFESSIONAL TIP A block reference with a fl ip parameter mirrors about the refl ection line. You must place the refl ection line in the correct location so the fl ip creates a symmetrical, or mirrored, copy. This typically requires the refl ection line to be coincident with the block insertion point. Ribbon Block Editor Action Parameters Flip Type BPARAMETER Flip flip parameter: A parameter that mirrors selected objects within a block. flip action: An action used to flip the entire block or selected objects within the block. Figure 26-25. A—Adding a flip parameter to an architectural floor plan door block. B—Moving the parameter so the block will flip correctly about the centerline of a wall. Base point Flip parameter grip Reflection line Endpoint A B Parameter label