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Arranging and Patterning

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Detailed Explanation about the Array command

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  • 351

    Arranging and Patterning Objects

    12Learning ObjectivesAfter completing this chapter, you will be able to:

    Relocate objects using the MOVE command. Change the angular position of objects using the ROTATE command. Use the ALIGN command to move and rotate objects at the same time. Make copies of objects using the COPY command. Draw mirror images of objects using the MIRROR command. Use the REVERSE command. Create patterns of objects using array commands.

    This chapter explains methods for arranging and patterning existing objects using basic editing commands. The approach to editing presented in this chapter is to access a command, such as MOVE, and then follow the prompts to complete the operation. Another technique, presented in Chapter 13, is to select objects rst using the cross-hairs, then access the editing command, and nally complete the operation.

    Moving ObjectsUse the MOVE command to move objects to a different location. Access the MOVE

    command and select objects to move. At the next prompt, specify the base point from which the objects will move. Although the position of the base point is often not crit-ical, you may want to select a point on an object, the corner of a view, or the center of a circle, for example. The selection moves as you move the crosshairs. Specify a second point to complete the move. See Figure 12-1.

    Displacement OptionThe Displacement option allows you to move objects relative to the origin of the

    UCS (user coordinate system), which is at coordinates 0,0,0 by default. To move using a displacement, access the MOVE command and select objects to move. Then choose the Displacement option instead of de ning the base point. At the Specify displacement : prompt, enter an absolute coordinate to move the objects from the origin to the coordinate point. See Figure 12-2.

    MO

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    Home > Modify

    Move

    Type

    MOVEM

    This sample chapter is for review purposes only. Copyright The Goodheart-Willcox Co., Inc. All rights reserved.

  • 352 AutoCAD and Its ApplicationsBasics

    Using the First Point As DisplacementAnother method for moving an object is to use the rst point as the displacement.

    The coordinates you use for the base point automatically dene the coordinates for the direction and the distance to move the object. Access the MOVE command and select objects to move. Then specify the base point, and instead of locating the second point, right-click or press [Enter] or the space bar to accept the default. See Figure 12-3.

    PROFESSIONAL TIPUse object snap modes while editing. For example, to move an object to the center of a circle, use the Center object snap mode to select the center of the circle.

    Figure 12-1. Using the MOVE command to relocate objects. Select base

    point

    Second point

    Selected objectshighlighted

    Move objects intoposition and picksecond point

    Figure 12-2. Using the Displacement option of the MOVE command and the default 0,0,0 origin to move objects. In this example, the origin is the base point and the absolute coordinate point 2,2 is the displacement.

    Selected objectshighlighted

    2,2

    0,0

    Chapter 12 Arranging and Patterning Objects 353

    Exercise 12-1Complete the exercise on the companion website.www.g-wlearning.com/CAD

    Rotating ObjectsUse the ROTATE command to rotate objects. For example, rotate furniture to adjust

    an interior design plan, or rotate the north arrow on a site plan. Access the ROTATEcommand and select objects to rotate. Proceed to the next prompt and specify the base point, or axis of rotation, around which the objects rotate. Next, enter a value or specify a point to de ne a rotation angle at the Specify rotation angle or [Copy/Reference] : prompt. Objects rotate counterclockwise by default. To rotate an object clockwise, use a negative value. See Figure 12-4.

    Figure 12-3.Moving a circle using the selected base point, 1,1 in this example, as the displacement.

    Object moves accordingto the coordinatesof the base point

    Selected base pointat center 1,1

    Selected objectshighlighted

    2,2

    X=1

    Y=1

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    Rotate

    Type

    ROTATERO

    Figure 12-4.Rotating a north arrow on a site plan 30 (330) and 30.

    3030

    30 Rotation 30 RotationBase point(midpoint)

    3030

    This sample chapter is for review purposes only. Copyright The Goodheart-Willcox Co., Inc. All rights reserved.

  • 354 AutoCAD and Its ApplicationsBasics

    Reference OptionThe Reference option is an alternative to entering a rotation angle and allows you

    to specify a new angle in relation to an existing angle. For example, use the Reference option to rotate a gear from 150 to 0. Choose the Reference option and specify the current angle, 150 in the example, at the Specify the reference angle : prompt. Next, specify the angle at which the objects should be, 0 in the example. See Figure 12-5A. Use the Points function of the Reference option to specify the new angle using two points not associated with the selected base point.

    PROFESSIONAL TIPSpecify the reference and new angles using specic values; or choose points, often on existing objects, as shown in Figure 12-5B. Picking points is especially effective when you do not know the exact refer-ence and new angles.

    Figure 12-5. Using the Reference option of the ROTATE command to rotate a gear on an assembly drawing according to the current angle of the objects. AEntering reference angles. BSelecting points on a reference line.

    2. Specify the current rotation angle

    1. Select the base point (center)

    Original 150 Rotation Rotated to 0A

    1503. Specify 0 as the new rotation angle

    3. Specify 0 as the new rotation angle

    Unknownangle

    1. Select the base point (center)

    Original Unknown Rotation Rotated to 0

    2. Pick two points to specify the rotation angle

    B

    Chapter 12 Arranging and Patterning Objects 355

    Copying While RotatingThe Copy option of the ROTATE command copies and rotates the selected objects,

    leaving the original object unchanged. The copy rotates to the speci ed angle.

    Exercise 12-2Complete the exercise on the companion website.www.g-wlearning.com/CAD

    Aligning ObjectsUse the ALIGN command to move and rotate objects in one operation. The ALIGN

    command is primarily meant for 3D applications, but it can be used for 2D drawings. Access the ALIGN command and select objects to align. Then specify source pointsand destination points. Pick the rst source point, followed by the rst destination point. Then pick the second source point and the second destination point. Two source and destination points are adequate for aligning 2D objects. Right-click or press [Enter]or the space bar when the prompt requests the third source and destination points. See Figure 12-6. The last prompt allows you to change the size of the source objects. Choose Yes to scale the source objects if the distance between the source points is different from the distance between the destination points. See Figure 12-7.

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    ALIGNAL

    source points: Points to define the original position of an object during an ALIGN operation.

    destination points: Points to define the new location of objects during an ALIGN operation.

    Figure 12-6.Using the ALIGN command to move and rotate a kitchen cabinet layout against a wall. Select the No choice of the Scale option to apply this example.

    DW

    LS MIC

    KITCHEN10/0 X 11/7

    DW

    LSM

    IC

    KITCHEN10/0 X 11/7

    Firstdestinationpoint

    Seconddestinationpoint

    Second sourcepoint

    First sourcepoint

    Figure 12-7.Select the Yes choice of the Scale option to change the size of an object during the alignment. The rectangle in this example is a polyline object created using the RECTANGLE command.

    First sourcepoint

    First destinationpoint

    Second sourcepoint

    Second destinationpoint

    Original Objects Rectangle Not Scaled Rectangle Scaled

    This sample chapter is for review purposes only. Copyright The Goodheart-Willcox Co., Inc. All rights reserved.

  • 356 AutoCAD and Its ApplicationsBasics

    Exercise 12-3Complete the exercise on the companion website.www.g-wlearning.com/CAD

    Copying ObjectsUse the COPY command to copy objects. The COPY command is similar to the

    MOVE command, except that when you pick a second point, the original objects remain in place and a copy appears. See Figure 12-8. Access the COPY command, select objects to copy, specify a base point, and pick a location to locate the copy. You can continue creating copies of the selected objects by specifying additional points. Use the Undo option to remove copies without exiting the COPY command. Press [Enter] or the space bar, or right-click and select Enter to exit.

    The COPY command provides the same options as the MOVE command, allowing you to specify a base point and a second point, choose a displacement using the Displacement option, or de ne the rst point as the displacement.

    Exercise 12-4Complete the exercise on the companion website.www.g-wlearning.com/CAD

    NOTEThe Multiple copy mode is active by default and allows you to create several copies of the same object using a single COPY operation. To make a single copy and exit the command after placing the copy, use the mOde option and activate the Single function.

    CO

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    Home > Modify

    Copy

    Type

    COPYCOCP

    Figure 12-8.Using the COPY command to duplicate a polyline object.

    Original object

    Copy

    Selected object

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