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Computer Aided Engineering Drawing
Entity Draw Commands in AutoCAD
Chapter No 3
Sir Syed University of Engineering & Technology
Computer Engineering DepartmentUniversity Road, Karachi-75300, PAKISTAN
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Text Book
Text Book:Mastering AUTOCAD 14
By George Omura
Course Outline is available at CAED course website.
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Chapter Outline
LINE Command
LINETYPE Command
CHANGE Command POINT Command
PDMODE AND PDSIZE
CIRCLE Command
ARC Command
POLYGON Command
SKETCH Command
ELLIPSE Command DONUT Command
SOLID Command
TRACE Command
TEXT and DTEXT
STYLE Command
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Line Command
The LINE command lets you draw straight lines.
You can specify the desired endpoints using either 2D
or 3D coordinates, or a combination of the two. If you
enter 2D coordinates, AutoCAD uses the current
elevation as the Z component of the point.
Format: LINE
From point: Enter a point.
To point: Enter a point.
To point: to end line sequence.
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Line Command
To erase the last line segment without exitingthe LINE command, enter "u" at the To point:prompt.
You can constrain lines to horizontal or verticalby using the ORTHO command.
Relative, cylindrical, and spherical coordinatepoint entry is allowed.
You can also use object snap to specifyparticular points -- endpoints of lines, centersof circles, etc. -- of previously drawn entities.
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Drawing Lines
To draw single-segment and multiple-segment lines: 1. Choose Line from the Draw menu, then choose
Segments. 2. Using the mouse, click a point on the screen. 3. Move the crosshairs to a second point on the
screen.As you move the crosshairs, a rubber-band lineshows you what the line will look like.
4. Click on the second point. 5. To end the line at the second point, press the right
mouse button (this is the same as pressing ).
If you want to continue the line, keep clicking points on thescreen. AutoCAD draws additional lines, each starting at theendpoint of the previous line. When you are done, press the rightmouse button.
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Draw Line Sub Menu
SegmentsDraws multiple line segments. See LINE and Drawing Lines.
1 Segment
Draws a single line segment. See LINE and Drawing Lines.
Double linesDraws a continuous double line using straight-line segmentsand arcs.
SketchLets you draw freehand.
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Line Type
The LINETYPE command sets the linetype for new
entities.
It can also load linetype definitions from a library file,
write new definitions to a library file, and list the
linetype definitions in a library file.
You can control the dot-dash linetype of each entity
individually, or by layer.
Format: LINETYPE
? / Create / Load / Set: ?
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Line Type
To change the linetype of existing objects, use theCHANGE command. To control layer linetypes, usethe LAYER command.
Options
? Lists the linetypes defined in a specifiedlibrary file.
Create Allows creation of a new linetype andstores it in a specified library file.
Load Loads selected linetypes from a specifiedlibrary file. Set Sets the current linetype used for newly
drawn entities.
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Change Command
The CHANGE command lets you modify or change the
properties of existing objects in the drawing.
Format:CHANGE Select objects:
Properties/:
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Point Command
The POINT command lets you place a Point entity in the
drawing.
Points are useful as "nodes" for object snap purposes.
The appearance of Points in your drawing is governed
by the PDMODE and PDSIZE system variables.
Format:POINT
Point: Designate a point.
You can enter the DDPTYPE command to view the
various forms a point can take.
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PDMODE
PDMODE is a system variable that stores the display
mode for Point entities.
The value stored is an integer and is saved in thedrawing file.
When you enter the POINT command, AutoCAD
draws the Point entity in the form specified byPDMODE, and at the size specified by the PDSIZE
system variable.
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PDMODE
Options 0(Default) A dot at a point.
1Nothing.
2A cross through a point.
3An X through a point. 4A vertical line upward from a point.
To each of these values you can add 32, 64, or 96 to set afigure to be drawn around a point. + 32 Draws a circle around a point. + 64 Draws a square around a point.
+ 96 Draws a circle and square around a point.
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PDMODE
Therefore, there are 16 valid PDMODE settings:
0 32 64 96
1 33 65 97
2 34 66 98
3 35 67 99
4 36 68 100
Note: All Points are redrawn to the form currentlyspecified by PDMODE when the drawing is
regenerated.
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PDSIZE
PDSIZE is a system variable that stores the displaysize for Point entities. The value stored is a realnumber and is saved in the drawing file.
By default, AutoCAD displays Point entities as a singlepixel.
If PDSIZE is set to a positive number, it specifies anabsolute size for Point entities. If negative, it is
interpreted as a percentage of the viewport size, andPoint entities retain their appearance as you zoom inand out, provided the zoom performs a drawingregeneration.
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DDTYPE Point Style Dialogue Box
The DDPTYPE command lets you specify a new pointdisplay mode and size. Format:DDPTYPE
When you enter the DDPTYPE command, AutoCADdisplays the Point Style dialogue box. Current values forthe point display mode and size are shown. Change thepoint display mode by clicking the new image tile.
The PDMODE system variable is updated when you exitthe dialogue box. The value you specify in the Point Sizeedit box depends on which radio button you select
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Circle
The CIRCLE command draws a circle as specified by any
one of four methods.
Format:CIRCLE
3P/2P/TTR/: Enter a point.
Diameter/: Enter radius value.
Options
3P Three points about the circumference
2P Two points defining the diameter
TTR Tangent, tangent, radius
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Draw Circle Sub Menu
Center, Radius Draws a circle based on center point and radius.
Center, Diameter Draws a circle based on center point and diameter.
2 Point Draws a circle based on 2 endpoints of diameter.
3 Point Draws a circle based on 3 points on the circumference.
Tangent, Tangent, Radius Draws a circle based on the radius and two lines the
circle is tangent to.
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Arc Command
The ARC command draws an arc (circle segment) as
specified by any of the following methods:
Three points on the arc Start point, center, endpoint
Start point, center, included angle
Start point, center, length of chord
Start point, endpoint, radius Start point, endpoint, included angle
Start point, endpoint, starting direction
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Arc Command
Format: ARC
Center/: Enter a point.
Center/End/: Enter a point.
Endpoint: Enter a point.
Options
A Included Angle
C Center point
D Starting Direction
E Endpoint
R Radius
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Draw Arc Sub Menu
3 Point Draws an arc based on 3 points.
Start, Center, End Draws an arc based on a start, center, and endpoint.
Start, Center, Angle Draws an arc based on a start point, center point, spanning an
angle.
Start, Center, Length Draws an arc based on a start point, center point, and length of
chord.
Start, End, Angle Draws an arc based on start point, endpoint, and specified angle. Start, End, Radius
Draws an arc based on a start point, endpoint, and radius.
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BPOLY -- Polyline Creation Dialogue Box
The BPOLY command creates a Polyline of aboundary.
The area isn't hatched, and it's saved in your drawing.
In the Polyline Creation dialogue box, the Define
boundary Set area and the Ray Casting popup list areidentical to the ones in the Advanced Options dialoguebox used by BHATCH.
When you use BPOLY, AutoCAD disables the RetainBoundaries check box. Pick the "Pick Points" button toaccept the settings in the Polyline Creation dialoguebox and create a Polyline. AutoCAD clears thedialogue box and displays this prompt:
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Polygon Command
The POLYGON command lets you draw regular
polygons that can have 3-1024 sides. The size of the
polygon can be specified by the radius of a circle in
which it is inscribed or about which it is circumscribed,
or by the length of an edge.
Format: POLYGON
Number of sides : Enter a number or press
Edge/: Enter a point.
Inscribed in circle/Circumscribed about circle (I/C):
Radius of circle:
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Polygon Command
If you respond to the Edge/Center...option with E,
you'll be prompted to specify the first and second
endpoints of one of its edges:
If you respond to the Inscribed../Circumscribed...
option with I, you should then enter the radius of a
circle on which all the vertices of the polygon will lie.
You can enter the radius numerically, or pick a point
relative to the center of the polygon. If you pick a point,a vertex of the polygon is drawn at that point.
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Polyside Command
POLYSIDES is a system variable that sets the defaultnumber of sides for the POLYGON command. Thevalue stored is an integer; the range is 3-1024.
Draw / Polygon Submenu Edge
Draws an equal sided polygon based on the endpoints ofone edge of the polygon.
Circumscribed Draws an equal sided polygon circumscribing a circle of a
specified radius. Inscribed
Draws an equal sided polygon inscribed within a circle ofa specified radius.
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Sketch Command
The SKETCH command lets you draw freehand. Itrequires a pointing device such as a digitizing tablet ormouse.
Format: SKETCH Record increment : Enter a number. Sketch.Pen eXit Quit Record Erase Connect.
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Sketch Command
Options
Pen Raises/lowers sketching pen.
Quit Discards temporary lines, and exitsSketch.
Record Records temporary lines, but remains in
Sketch.
Erase Erases temporary lines from a specifiedpoint
Connect Restarts sketch at last endpoint.
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Ellipse Command
The ELLIPSE command lets you draw ellipses.
Format: ELLIPSE /Center: Enter a point or C. Axis endpoint 2: Enter a point. /Rotation:
If you respond to the /Center promptwith C, AutoCAD prompts for the center point, and oneendpoint of each axis.
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Ellipse Command
If you have selected isometric Snap mode, ELLIPSElets you draw a circle in the current isometric drawingplane, as follows: Format: ELLIPSE /Center/Isocircle: I Center of circle: Enter a point. /Diameter: Enter a radius
distance or D.
The "Center of circle" is the center point of the originalcircle as projected into the isometric drawing plane.The radius or diameter is the radius or diameter of theoriginal circle as it would appear in a face-onprojection.
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Donut Command
The DONUT (or DOUGHNUT) command draws a filledcircle or ring.
Format:DOUGHNUT Inside diameter : Enter a value or two points.
Outside diameter: Enter a value or two points. Center of doughnut: Enter a point.
The "Center of doughnut" prompt is repeated for multiplelocations of the doughnuts. A null response ends the
DOUGHNUT command. The DOUGHNUT command constructs a closed Polyline
(composed of wide arc segments) represents the specifiedobject.
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Solid Command
The SOLID command lets you draw solid-filled regions byentering them as quadrilateral or triangular sections.
Format: SOLID First point: Enter a point.
Second point: Enter a point. Third point: Enter a point. Fourth point: Enter a point or press for triangular section. Third point: Enter a point or press to end solid.
The SOLID command prompts for the third and fourth pointrecursively, letting you continue drawing solid-filled regions.
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Trace Command
The TRACE command lets you draw Traces, solid-filled
lines of specified width. Traces may be constrained to
horizontal or vertical by the ORTHO command.
Format: TRACE
Trace width :
From point: Enter a point.
To point: Enter a point. To point: Enter a point.
To point: Press to end trace entry.
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TEXT Command
The TEXT command draws text of any desired
size and angle.
Format: TEXT Justify/Style/: Enter a point.
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TEXT Command
Options Justify Allows you to pick from a list of text
alignment options: Align (A), Fit (F),
Center (C), Middle (M), Right (R),
Some alignment options prompt you to
identify Height and Rotation angle.
Style Displays the current text style name,and allows you to name a new style orpick from a list of available styles.
Start point Left-justifies text to the point youspecify. Also prompts you to identifyHeight and Rotation angle.
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DTEXT Command
The DTEXT command allows you to enter text
dynamically: text appears on the screen character by
character as you enter it.
You can enter multiple lines of text with one command.
DTEXT is similar to the TEXT command, and beginsby prompting for the same information.
Format: DTEXT
Justify/Style/:
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Draw TEXT Sub Menu
Dynamic Draws text characters of any size, with
selected styles. See DTEXT.
Import Text Lets you import a text file into the
current drawing.
Set Style...Displays dialogue box of available text
styles. See STYLE.
Attributes > Attributes submenu
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STYLE Command
The STYLE command lets you create new text styles
and modify existing ones.
Format: STYLE
Text style name (or ?) :
Font file :
Height :
Width factor : Enter a scale factor.
Backwards?
Upside-down?
Vertical?