Zoom and Pan
Sacramento City College
Engineering Design Technology
Zoom and Pan
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Objectives
 Use
real-time zoom and pan
 Magnify a small part of the drawing to
work on details
 Move the display window to reveal
portions of the drawing outside the
boundaries of the monitor.
 Explain the differences between the
REDRAW command and the REGEN
command.
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Regenerating the Screen
The REGEN Command
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Redrawing/Regenerating the Screen
 To
regenerate the drawing, REGEN is
used.
 REGEN
 recalculates
all of the drawing object
coordinates and
 regenerates the display based on the current
zoom magnification.
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Redrawing/Regenerating the Screen
 AutoCAD
 Uses
line segments to represent all drawing
entities on the screen.
 If you are zoomed in, circles may appear to
have straight line segments
 Use REGEN to change them to smooth
curves.
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Use
REGEN
to change
to smooth
circle
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Commands That Can be Used While
“Inside” Other Commands
The “Transparent Commands”
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Transparent Commands
 Several
commands can be used “inside” or
“in the middle of” another command.
 They
are called transparent commands.
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Transparent Commands
 Transparent
Commands
 REDRAW
 PAN
 VIEW
 HELP
 Several
ZOOM options
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Transparent Commands
 To
execute a “transparent” command:
 Enter
the transparent command preceded by
an apostrophe.
 While
in another command, type:
 ‘Zoom
All [Enter]
 The zoom command executes and you
remain inside the previous command.
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The ZOOM Command
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Zooming
 Several ZOOM
 In
 Out
 Extents
 Center
 Dynamic
 Window
 Scale
 Previous
 All
 XP
options exist.
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Zooming

Very useful
 All
 Not
 In
 Previous
 Extents

Only works on TB
 Out

 Window
 XP
so useful
Only works on TB
 Center
Too many steps
 Magnification value input
required

 Dynamic

Was very useful prior to
wheel mouse.
 Scale
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
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Magnification/scale required
Zoom
 Zoom
ALL: “Z space A space”
 Zooms
to display drawing limits
 If objects are larger than the limits, a ZOOM
EXTENTS is executed.
 Always use a ZOOM ALL after you change
the drawing limits.
 Zoom
PREVIOUS: “Z space P space”
 Returns
to the previous display.
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Zoom
 Zoom
EXTENTS:“Z space E space”
 EXTENTS
 Is
the portion of the drawing area that contains
drawing objects.
 The
result of this command is conditional
 1. If all drawing objects are inside the LIMITS
 Zooms
to the LIMITS of the drawing.
 LIMITS = EXTENTS
 2.
If drawing objects are outside the LIMITS
 Zooms
to EXTENTS of the drawing.
 LIMITS <> EXTENTS
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Zoom
 Zoom
WINDOW: “Z space W space”
 Pick
opposite corners of a box. The box
becomes the next display.
 This is the default zoom option if you pick a
point on the screen.
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Zoom
 Zoom
XP:
 This
option is used in conjunction with Model
Space and Paper Space.
 Is used primarily in the layout of scaled multiview drawings prior to plotting
 It scales a Paper Space viewport (which
displays Model Space) relative to Paper
Space.
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Zoom
 Zoom
IN:
 Available
ONLY on the tool bar.
 Automatically executes a 2x zoom scale
factor.
 Zoom
OUT:
 Available
ONLY on the tool bar.
 Automatically executes a 0.5 zoom scale
factor.
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Zoom
 Zoom
CENTER:
 Pick
the center and height of the next screen
display.
 A magnification factor can be entered by
typing a number followed by an X.
 The current value represents the height of the
screen in drawing units.
 Entering a smaller number enlarges the
image size;
 a larger number reduces image size.
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Zoom
 Zoom
DYNAMIC:
 Allows
for a graphic pan and zoom with the
use of a view box that represents the screen.
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Zoom
 (Zoom)
SCALE:
 You
can enlarge/reduce display by typing an
X after the scale.
 Type 2X if you want the image enlarged two
times
 Type 0.5X if you want image reduced by 1/2.
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Moving Around the Display Screen
The PAN Command
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PANing Around the Screen
 The
PAN command allows you to move
your view point around the drawing
without changing the magnification factor.
 Command:
 Hit
Pan or (P)
[Enter] to exit Pan.
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PANing Around the Screen
A
REALTIME PAN allows you to see the
drawing as you pan.
 Pick
PAN or RTPAN commands
 OR
 Pick
Real Time from the PAN cascading
menu
 OR
 Pick
the Pan Realtime button on the Standard
toolbar.
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PANing Around the Screen
 Hold
the left mouse button and move the
mouse in the direction you wish to pan.
 Exit
command with right-click menu.
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PANing Around the Screen
 You
can also use the Pan Presets.
 Left
 Right
 Up
 Down
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PANing Around the Screen
 You
can also use the Scroll Bars to Pan.
 Left
 Right
 Up
 Down
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