1. Polygon, polyline and donut
University of Technology
Computer engineering and information technology Department
AutoCAD
lecture(13)
Modify command
Polygon, polyline and donut
Issued by: Ms.c. Ameer Mosa Thoeny

2. University of Technology
Computer engineering and information technology Department
1-POLYGON:
The POLYGON command enables you to draw multi-sided, closed figures with equal side lengths. You can draw polygons that have from 3 to 1,024 sides.
First specify the number of sides. Then choose one of three methods of defining the polygon.

3. Choose the Edge option. Specify the two endpoints of any
University of Technology
Computer engineering and information technology Department
1-Edge option:
Choose the Edge option. Specify the two endpoints of any
edge of the polygon to complete the polygon.
The command syntax for copy is as follows:
Command: polygon
Enter number of sides <5>: 5
Specify center of polygon or [Edge]: e
Specify first endpoint of edge: 10,10
Specify second endpoint of edge: 20,20

4. University of Technology
Computer engineering and information technology Department
2-Inscribed in circle:
After specifying the center, choose Inscribed in Circle. Then specify the radius from the center to a vertex (point). This defines the polygon with reference to an imaginary circle whose circumference touches all the vertices of the polygon.
The command syntax for copy is as follows:
Command: polygon
Enter number of sides <4>: 5
Specify center of polygon or [Edge]: 20,20
Enter an option [Inscribed in circle/Circumscribed about circle] <I>:I
Specify radius of circle: 10

5. 3-Circumscribed about circle:
University of Technology
Computer engineering and information technology Department
3-Circumscribed about circle:
After specifying the center, choose Circumscribed about Circle. Then specify the radius from the center to the midpoint of a side. This defines the polygon with reference to an imaginary circle whose circumference touches all the midpoints of the polygon’s sides.
The command syntax for copy is as follows:
Command: polygon
Enter number of sides <5>: 5
Specify center of polygon or [Edge]: 20,20
Enter an option [Inscribed in circle/Circumscribed about circle] <I>: c
Specify radius of circle: 10

6. 2-POLYLINE: The command syntax for copy is as follows: Command: pline
University of Technology
Computer engineering and information technology Department
2-POLYLINE:
The command syntax for copy is as follows:
Command: pline
Specify start point: 0,0
Current line-width is
Specify next point or [Arc/Halfwidth/Length/Undo/Width]: w
Specify starting width <2.0000>: 2
Specify ending width <2.0000>: 2
Specify next point or [Arc/Halfwidth/Length/Undo/Width]: 20,20
Specify next point or [Arc/Close/Halfwidth/Length/Undo/Width]: 40,0
Specify next point or [Arc/Close/Halfwidth/Length/Undo/Width]: 60,20
Specify next point or [Arc/Close/Halfwidth/Length/Undo/Width]: 80,0
Specify next point or [Arc/Close/Halfwidth/Length/Undo/Width]: 100,20
Specify next point or [Arc/Close/Halfwidth/Length/Undo/Width]:enter

7. Specify next point or [Arc/Halfwidth/Length/Undo/Width]: w
University of Technology
Computer engineering and information technology Department
Command: pline
Specify start point: 0,0
Current line-width is
Specify next point or [Arc/Halfwidth/Length/Undo/Width]: w
Specify starting width <4.0000>: 2
Specify ending width <2.0000>: 10
Specify next point or [Arc/Halfwidth/Length/Undo/Width]: 60,0
Specify next point or [Arc/Close/Halfwidth/Length/Undo/Width]: 120,0
Specify next point or [Arc/Close/Halfwidth/Length/Undo/Width]:

8. Specify next point or [Arc/Halfwidth/Length/Undo/Width]: w
University of Technology
Computer engineering and information technology Department
Command: pline
Specify start point: 0,0
Current line-width is
Specify next point or [Arc/Halfwidth/Length/Undo/Width]: w
Specify starting width < >: 2
Specify ending width <2.0000>: 10
Specify next point or [Arc/Halfwidth/Length/Undo/Width]: 60,0
Specify next point or [Arc/Close/Halfwidth/Length/Undo/Width]: w
Specify next point or [Arc/Close/Halfwidth/Length/Undo/Width]: 120,0
Specify next point or [Arc/Close/Halfwidth/Length/Undo/Width]:

9. 3-Making Donuts
A donut is a wide polyline that looks like two concentric circles.
You define a diameter for the inner and outer circles.
Donuts are often used in electrical drawings to create symbols.
If the inner circle’s radius is zero, you create a filled-in circle.

10. The real view of donut as below:
University of Technology
Computer engineering and information technology Department
The real view of donut as below:
The command syntax for copy is as follows:
Command: donut
Specify inside diameter of donut <1.0000>: 20
Specify outside diameter of donut <5.0000>: 80
Specify center of donut or <exit>: 10,10
Specify center of donut or <exit>: