798 AutoCAD and Its Applications—Basics Copyright Goodheart-Willcox Co., Inc. After you defi ne the rotation parameter, pick a location for the parameter label. Next, enter the number of grips to associate with the parameter. The default 1 option creates a single grip at the parameter radius that allows you to use grip editing to carry out the rotate action. NOTE NOTE Name, Label, Chain, Description, Palette, and Value set options are available before you specify the parameter. Most of these options and the Base angle option are also avail- able from the Properties palette if you have already created the parameter. Assigning a Rotate Action To assign a rotate action to the speedometer example, access the Rotate action option and pick the rotation parameter. Then select the objects that make up the needle and the rotation parameter. Press [Enter] to place the action. If necessary, access the Properties palette and adjust the Base type option. The default Dependent option sets the rotation point as the base point of the rotation parameter, which is appropriate for the speedometer example. Test and save the block, and exit the Block Editor. The dynamic block is now ready to use. Using a Rotate Action Dynamically Figure 26-22 shows using the rotation parameter grip or dynamic input to rotate the needle inside the speedometer block reference. The Endpoint object snap is most appropriate to select a specifi c speed for this example. You can also use the Properties palette to defi ne the angle. Ribbon Block Editor Action Parameters Rotate Type BACTIONTOOL Rotate Figure 26-21. A rotation parameter with a rotate action allows you to rotate the needle in a speedometer block to indicate different speeds. Use the Base angle option to set a base angle other than 0°. 120 100 80 60 40 20 0 mph Rotation parameter grip Parameter radius Base angle Parameter base point Default rotation angle Parameter label