{float:left|border=2px solid black}
[!1.JPG|width=550px it correponds to the lower center of the pipe
Pipe{~}inr~ \- the inner radius of the pipe
Pipe{~}length~ \- the length of the pipe

h5. Inputs Defined within the Pipe Function

p2 =
* x : origin{~}0~ + outerradius(2*pipe{~}inr~)
* y : origin{~}1~
* z : origin{~}2~

p3 =
* x : origin{~}0~ + pipe{~}inr~
* y : origin{~}1~
* z : origin{~}2~

win1 =
* x : origin{~}0~ \- outerradius(2*pipe{~}inr~) - zc
* y : origin{~}1~ \- outerradius(2*pipe{~}inr~) - zc
* z : origin{~}2~

win2 =
* x : origin{~}0~ + outerradius(2*pipe{~}inr~) + zc
* y : origin{~}1~ + outerradius(2*pipe{~}inr~) + zc
* z : origin{~}2~

Pipe{~}outr~ = outerradius(2*Pipe{~}inr~)

               the outer radius of the pipe, found from the pipe database using the outerradius function

*Note:* zc corresponds to the zoom constant used within AutoCAD and created in the basics file that is referenced by the pipe program.

h1. Technical Program Outline

*Note:* All coordinates are referenced in top view in the program unless otherwise specified

[!1.JPG!|AutoCAD Pipe Program]
* *

*zoom{*}{*}{~}win{~}*\- zooms on a window space directly around where the pipe is to be draw (as shown above - actual window size relative to pipe that is to be drawn).  The points win1 and win2 are used to select this window size, based on including the space of the pipe (the outer radius) and a zoom constant (zc) to ensure the entire drawing will be within the frame.

zoom{~}win~ <-\- zoom{~}win~(win1,win2)

win1 =
* x : origin{~}0~ \- outerradius(2*pipe{~}inr~)
* y : origin{~}1~ \- outerradius(2*pipe{~}inr~)
* z : origin{~}2~

win2 =
* x : origin{~}0~ + outerradius(2*pipe{~}inr~)
* y : origin{~}1~ + outerradius(2*pipe{~}inr~)
* z : origin{~}2~
Top View
{float}

{float:left|border=2px solid black}
[!2.JPG|width=250px
[!2.JPG!|AutoCAD Pipe Program]
Top View
[!3.JPG|width=180px!|AutoCAD Pipe Program]
*cylinder1* \- Draws the larger of theSouthwest Isometric View
{float}

{float:left|border=2px solid black}
[!4.JPG|width=250px two cylinders needed to create a pipe. The cylinder has pipe{~}outr~ as the radius. From topview, the cylinder draws up towards the viewer with the pipe origin at the bottom base.

cylinder1 <-\- cylinder(origin,pipe{~}outr~,pipe{~}length~)

origin =
* x : origin{~}0~
* y : origin{~}1~
* z : origin{~}2~

pipe{~}outr~&nbsp;= outerradius(2*pipe{~}inr~)

pipe{~}length~&nbsp;= pipe{~}length~

[!4.JPG!|AutoCAD Pipe Program]
Top View
[!5.JPG|width=180px!|AutoCAD Pipe Program]
*cylinder2* \-Southwest Isometric View
{float}

{float:left|border=2px solid black}
[!6.JPG|width=380px Draws the smaller of the two cylinders needed to create the pipe. The cylinder has pipe{~}inr~ as the radius. From topview, the cylinder draws up towards the viewer with the pipe origin at the bottom base. This inner cylinder will then be subtracted to create the hollow pipe, with the inner radius as specified.

cylinder2 <-\- cylinder(origin,pipe{~}inr~,pipe{~}length~)

origin =
* x : origin{~}0~
* y : origin{~}1~
* z : origin{~}2~

pipe{~}inr~ : pipe{~}inr~

pipe{~}length~ : pipe{~}length~

[!6.JPG!|AutoCAD Pipe Program]
*subtract1* \- In order to create the hollow 
Top View
{float}

{float:left|border=2px solid black}
[!7.JPG|width=280pxpipe, the inner cylinder must be subtracted from the outer cylinder. The subtract function selects p2, on the edge of the inner cylinder, to select the inner cylinder as the piece to be subtracted. The subtract function then selects p3, on the edge of the outer cylinder, to select the outer cylinder to subtract from.

subtract <-\- subtract(p2,p3)

p2 =
* x : origin{~}0~ + pipe{~}inr~
* y : origin{~}1~
* z : origin{~}2~

p3 =
* x : origin{~}0~ + outerradius(2*pipe{~}inr~)
* y : origin{~}1~
* z : origin{~}2~

[!7.JPG!|AutoCAD Pipe Program]
Top View
{float}