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[!1.bmp!|width=280px!|AutoCAD Channel Program]
Southeast Isometric View
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h3. Input Definitions


h5. Inputs Needed to Call the Channel Function

channel{~}origin~ \- a 3*1 matrix with x,y,z positions corresponding to the point where the channel will be drawn

channel{~}dim~ \- a 3*1 matrix with the x,y,z positions specifying the dimensions of the channel cutout

t

 - specifies the thickness of the channel walls

h5. Inputs Defined within the Channel Function

p1 =

* x :

 channel{~}origin0~
* y : channel{~}origin1~
* z : channel{~}origin2~

p2 =
* x : channel{~}origin0~ + channel{~}dim0~
* y : channel{~}origin1~ + channel{~}dim1~
* z : channel{~}origin2~ + channel{~}dim2~

p3 =
* x : channel{~}origin0~
* y : channel{~}origin1~ \- t
* z : channel{~}origin2~ \- t

p4 =
* x : channel{~}origin0~ + channel{~}dim0~
* y : channel{~}origin1~ + channel{~}dim1~ + t
* z : channel{~}origin2~ channel{~}dim2~

p5 =
* x : channel{~}origin0~
* y : channel{~}origin1~ + channel{~}dim1~ + t

p6 =
* x : channel{~}origin0~ \- zc
* y : channel{~}origin1~ \- t - zc

p7 =
* x : channel{~}origin0~ + channel{~}dim0~ + zc
* y : channel{~}origin1~ + channel{~}dim1~ + t + zc

win1 =
* x : channel{~}origin0~
* y : channel{~}origin1~ \- t
* z : channel{~}origin2~

win2 =
* x : channel{~}origin0~ + channel{~}dim0~
* y : channel{~}origin1~ + channel{~}dim1~ + t
* z : channel{~}origin2~

h5. Technical Program Outline

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*viewtop* \- sets the workspace so that the user is viewing the top of the object.

viewtop <-- viewtop

*zoom{*}{*}{~}win{~}*\- zooms on a window space directly around where the channel is to be drawn (as shown above - actual window size relative to channel that is to be drawn).

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

win1 =
* x : channel{~}origin0~
* y : channel{~}origin1~ \- t
* z : channel{~}origin2~

win2 =
* x : channel{~}origin0~ + channel{~}dim0~
* y : channel{~}origin1~ + channel{~}dim1~ + t
* z : channel{~}origin2~

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*box1* \- creates a box that will serve as the channel cutout.

box1 <-- boxA(p1,p2)

p1 =
* x : channel{~}origin0~
* y : channel{~}origin1~
* z : channel{~}origin2~

p2 =
* x : channel{~}origin0~ + channel{~}dim0~
* y : channel{~}origin1~ + channel{~}dim1~
* z : channel{~}origin2~ + channel{~}dim2~

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*box2* \- creates the outer box of the channel.

box2 <-- boxA(p3,p4)

p3 =
* x : channel{~}origin0~
* y : channel{~}origin1~ \- t
* z : channel{~}origin2~ \- t

p4 =
* x : channel{~}origin0~ + channel{~}dim0~
* y : channel{~}origin1~ + channel{~}dim1~ + t
* z : channel{~}origin2~ channel{~}dim2~

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Southeast Isometric View, After Subtract
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*subtract1* \- subtracts the inner box from the outer box to create a channel, using p5 to select the outer box as the object to be subtracted from, and p6 and p7 to draw a box that selects the inner box as the object to be subtracted.

subtract1 <-- subtractH(p5,p6,p7)

p5 =
* x : channel{~}origin0~
* y : channel{~}origin1~ + channel{~}dim1~ + t

p6 =
* x : channel{~}origin0~ \- zc
* y : channel{~}origin1~ \- t - zc

p7 =
* x : channel{~}origin0~ + channel{~}dim0~ + zc
* y : channel{~}origin1~ + channel{~}dim1~ + t + zc

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