AutoCAD Pipe Program

General Program Information

Input Definitions

Inputs Needed to Call the Pipe Function
Origin - a 3*1 matrix with x,y,z positions corresponding to the point where the pipe will be drawn
Pipe_inr - th inner radius of the pipe
Pipe_length - the length of the pipe

Inputs Defined within the Pipe Function
p2 =

• x : origin₀ + outerradius(2*pipe_inr)
• y : origin₁
• z : origin₂
  p3 =
• x : origin₀ + pipe_inr
• y : origin₁
• z : origin₂
  win1 =
• x : origin₀ - outerradius(2*pipe_inr)
• y : origin₁ - outerradius(2*pipe_inr)
• z : origin₂
  win2 =
• x : origin₀ + outerradius(2*pipe_inr)
• y : origin₁ + outerradius(2*pipe_inr)
• z : origin₂

Pipe_outr - the outer radius of the pipe, found from the pipe database using the outerradius(2*Pipe_inr) function

Technical Program Outline

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

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).

zoom_win <-- zoom_win(win1,win2)

win1 =

• x : origin₀ - outerradius(2*pipe_inr)
• y : origin₁ - outerradius(2*pipe_inr)
• z : origin₂

win2 =

• x : origin₀ + outerradius(2*pipe_inr)
• y : origin₁ + outerradius(2*pipe_inr)
• z : origin₂

cylinder1 - Draws the larger of the 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 : origin₀
• y : origin₁
• z : origin₂

pipe_outr : outerradius(2*pipe_inr)

pipe_length : pipe_length

cylinder2 - 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

cylinder2 <-- cylinder(origin,pipe_inr,pipe_length)

origin =

• x : origin₀
• y : origin₁
• z : origin₂

pipe_inr : pipe_inr

pipe_length : pipe_length

subtract1 - In order to create the hollow pipe, 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 selects p3, on the edge of the outer cylinder, to select the outer cylinder to subtract from.

subtract <-- subtract(p2,p3)

p2 =

• x : origin₀ + outerradius(2*pipe_inr)
• y : origin₁
• z : origin₂

p3 =

• x : origin₀ + pipe_inr
• y : origin₁
• z : origin₂