CAED____ Chapter3b

8/14/2019 CAED____ Chapter3b

1/37

1

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


2/37

2

CAED - Chapter No 3 Entity Draw Commands in AutoCAD

Text Book

Text Book:Mastering AUTOCAD 14

By George Omura

Course Outline is available at CAED course website.


3/37

3


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


4/37

4


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.


5/37

5


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.


6/37

6


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.


7/37

7


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.


8/37

8


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: ?


9/37

9


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.


10/37

10


Change Command

The CHANGE command lets you modify or change the

properties of existing objects in the drawing.

Format:CHANGE Select objects:

Properties/:


11/37

11


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.


12/37

12


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.


13/37

13


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.


14/37

14


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.


15/37

15


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.


16/37

16


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


17/37

17


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


18/37

18


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.


19/37

19


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


20/37

20


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


21/37

21


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.


22/37

22


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:


23/37

23


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:


24/37

24


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.


25/37

25


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.


26/37

26


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.


27/37

27


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.

h i d i


28/37

28


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.

CAED Ch N 3 E i D C d i A CAD


29/37

29


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.

CAED Ch N 3 E i D C d i A CAD


30/37

30


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.

CAED Ch t N 3 E tit D C d i A t CAD


31/37

31


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.

CAED Ch t N 3 E tit D C d i A t CAD


32/37

32


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.

CAED Chapter No 3 Entit Dra Commands in A toCAD


33/37

33


TEXT Command

The TEXT command draws text of any desired

size and angle.

Format: TEXT Justify/Style/: Enter a point.

CAED Chapter No 3 Entity Draw Commands in AutoCAD


34/37

34


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.



35/37

35


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/:



36/37

36


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



37/37

37


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?

CAED____ Chapter3b

Documents

Transcript of CAED____ Chapter3b