AutoCAD and Its Applications—Comprehensive 2018, 25th Edition Page 796 (818 of 1650)

796 AutoCAD and Its Applications—Basics Copyright Goodheart-Willcox Co., Inc. Figure 26-19. Assigning a polar stretch action to a polar parameter. A—Specify the parameter and parameter grip, and create a window for the stretch frame. B—Select the objects to be included in the stretch action. C—Select the objects to be included in the rotation action. 1. Pick the polar parameter 7. Select all of the objects to rotate 6. Pick the second point of the crossing window A B C 2. Pick near the parameter point 3. Pick the first point for the stretch frame 4. Pick the second point for the stretch frame 5. Pick the first point of the crossing window

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Chapter 26 Introduction to Dynamic Blocks 795 Copyright Goodheart-Willcox Co., Inc. Assigning a Polar Stretch Action Figure 26-19 illustrates the process of adding a polar stretch action to the steel channel shape example. Access the Polar Stretch action option and pick the Depth parameter. Then specify a parameter point to associate with the action. Move the crosshairs near the appropriate parameter point to display the red snap marker, and pick to select. Alternatives include selecting the sTart point option to pick the start point of the polar parameter, or the Second point option to select the endpoint. If you plan to use grip editing to control the block, and added a single grip, specify the point with the grip. Next, create a window to defi ne the stretch frame. This is the same technique you apply when using the STRETCH command. See Figure 26-19A. Pick the objects to stretch, including the associated parameter. You do not need to use a crossing window, because the previous operation defi nes the stretch. However, crossing selec- tion is often quicker. See Figure 26-19B. Then select the objects to rotate, which are often the objects of a block. See Figure 26-19C. Press [Enter] to place the action icon. Test and save the block, and exit the Block Editor. The dynamic block is now ready to use. Using a Polar Stretch Action Dynamically Figure 26-20 shows the steel channel shape block reference selected for editing. The polar parameter grip appears as a light blue square at the far end of the channel depth. The insertion base point specifi ed when the block was created appears as a standard unselected grip. Select the parameter grip and stretch the channel depth to the new length and angle. Use dynamic input to view the stretch dimension and rotation angle, and enter an exact length value in the distance fi eld and rotation angle in the angle fi eld. You can also use the Properties palette to defi ne the distance and rotation angle. Ribbon Block Editor Action Parameters Polar Stretch Type BACTIONTOOL Polar Stretch polar stretch action: An action used to change the size, shape, and rotation of block objects with a stretch operation. Figure 26-18. An example of a portion of a motor mount with side views of different steel channel shapes that were created and rotated using a single block with a polar parameter assigned a polar stretch action.

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Chapter 26 Introduction to Dynamic Blocks 797 Copyright Goodheart-Willcox Co., Inc. NOTE NOTE The Properties palette includes Distance multiplier and Angle offset options for move, stretch, and polar stretch actions. Enter a value in the Distance multiplier text box to multiply by the parameter value when adjusting the block. For example, if you assign a distance multiplier of 2 to a move action and move an object 4 units, the object actu- ally moves 8 units. Enter an angle in the Angle offset text box to change the parameter grip angle. For example, if you assign an offset angle of 45 to a move action and move an object 10°, the object actually moves 55°. Exercise 26-5 www.g-wlearning.com/CAD/ Complete the exercise on the companion website. Rotation Parameters Rot a tion P a r a meter s A rotation parameter creates a rotation property to which you can assign a rotate action. For example, assign a rotation parameter with a rotate action to the needle in the speedometer block shown in Figure 26-21 to rotate the needle around the circum- ference of the dial. To insert the rotation parameter, access the Rotation parameter option and pick the center of the circular base of the needle as the rotation base point. Then pick a point, such as the needle endpoint shown, to specify the parameter radius. Set the default rotation angle from 0° east, or if rotation should originate from an angle other than 0°, use the Base angle option. Figure 26-21 shows using the Base angle option to base the rotation at –10° and then specifying a default rotation angle of 200° to align the rotation with the 120 and 0 mph marks. rotation parameter: A parameter that allows objects in a block to rotate independently of the block. rotate action: An action used to rotate objects within a block without affecting the other objects in the block. Ribbon Block Editor Action Parameters Rotation Type BPARAMETER Rotation Figure 26-20. Applying the polar stretch action. Specify angle value Polar parameter grip Specify length value Insertion point grip

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