AutoCAD and Its Applications—Basics 2014, 21st Edition Page 362 (362 of 1072)

362
AutoCAD and Its Applications—Basics
Reference Option
The
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
current
:
prompt. Next, specify the angle at which the objects should be, 0° in the example. See
Figure 12-5A. Use the
Points
option of the
Reference
option to specify the new angle
using two points not associated with the selected base point.
PROFESSIONAL S TIP P P P R O R O F FE S SS I O N N A A L T NA NA AL T TI P P P P
Specify the reference and new angles using specific values; or pick fi
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. A—Entering reference angles.
B—Selecting points on a reference line.
2. Specify the current
rotation angle
1. Select the base
point (center)
Original 150° Rotation Rotated to 0°
A
150°
3. Specify 0° as the
new rotation angle
3. Specify 0° as the
new rotation angle
Unknown
angle
1. Select the base
point (center)
Original Unknown Rotation Rotated to 0°
2. Pick two points
to specify the
rotation angle
B

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362
AutoCAD and Its Applications—Basics
Reference Option
The
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
current
:
prompt. Next, specify the angle at which the objects should be, 0° in the example. See
Figure 12-5A. Use the
Points
option of the
Reference
option to specify the new angle
using two points not associated with the selected base point.
PROFESSIONAL S TIP P P P R O R O F FE S SS I O N N A A L T NA NA AL T TI P P P P
Specify the reference and new angles using specific values; or pick fi
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. A—Entering reference angles.
B—Selecting points on a reference line.
2. Specify the current
rotation angle
1. Select the base
point (center)
Original 150° Rotation Rotated to 0°
A
150°
3. Specify 0° as the
new rotation angle
3. Specify 0° as the
new rotation angle
Unknown
angle
1. Select the base
point (center)
Original Unknown Rotation Rotated to 0°
2. Pick two points
to specify the
rotation angle
B

Help

Chapter 12 Arranging and Patterning Objects
363
Copying While Rotating
The
Copy
option of the
ROTATE
command copies and rotates the selected objects,
leaving the original objects unchanged. The copy rotates to the specified angle. fi
Exercise 12-2
Complete the exercise on the companion website.
www.g-wlearning.com/CAD
Aligning Objects Aligning Object s
Use 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 points
and destination points. Pick the first source point, followed by the first fi destination fi
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. 7 7
ALIGN
Ribbon
Home
Modify
Align
Type
ALIGN
AL
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
option of the
Scale
option to apply this example.
DW
LS
MIC M
KITCHEN
10/0 X 11/7
DW
LS
MIC
M
KITCHEN
10/0 X 11/7
First
destination
point
Second
destination
point
Second source
point
First source
point
Figure 12-7.
Select the
Yes
option 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 source
point
First destination
point
Second source
point
Second destination
point
Original Objects Rectangle Not Scaled Rectangle Scaled

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Chapter 12 Arranging and Patterning Objects
361
Exercise 12-1
Complete the exercise on the companion website.
www.g-wlearning.com/CAD
Rotating Objects Rot a ting Object s
Use 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
ROTATE
command 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 defi a rotation angle at the fine
Specify rotation angle or [Copy/Reference]
current
:
prompt. Objects rotate counterclockwise by default. To rotate an object
clockwise, use a negative value. See Figure 12-4.
ROTATE
Ribbon
Home
Modify
Rotate
Type
ROTATE
RO
Figure 12-3.
Moving a circle
using the selected
base point,
1,1
in
this example, as the
displacement.
Object moves according
to the coordinates
of the base point
Selected base point
at center
1,1
Selected objects
highlighted
2,2
X=1
Y=1
Figure 12-4.
Rotating a north arrow on a site plan –30° (330°) and 30°.
30° 30 °
30° Rotation –30° Rotation
Base point
(midpoint)
–30°0 – –3 °

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