Geometric Calculation with ruby

[davesexcel]

![11.25" width](/uploads/imported_attachments/Rd18_StringerWidth.jpg "11.25" width")
Hi,
I am trying to get a point so that my group ends up being 11.25" wide.
` Sketchup.active_model.entities.clear!

b=51.5
d=46.5
e=0.5
rise=7.75
run=10

#<<<routed stringer

group = ent.add_group(); group.name="Routed Stringer"

ent6 = group.entities
pts = []

pts[0] = [0,b-(1+e),d]
pts[1] = [0,b-(4+e),d]
pts[2] = [0,-3, rise]
pts[3] = [0, -3, 0]
pts[4] = [0,(run+2.5)*0.4256, 0]
pts[5] = [0, b-(1+e), (d-12 )]

   #add the face to the entities in the model
face = ent6.add_face pts`

The calculation I came up with will only work when the variables are a specific value, has anybody an idea how to calculate the points, so my width stays 11.25 with variable inputs?

Thanks

[sdmitch]

Are b,d,e,rise,run all variables?

[davesexcel]

Hello,
b & d are variables, rise and run are calculated from b & d.

for this example rise=d/6 and run=(b-(1+e))/5

I just put in the numbers so the code can easily be copied and run

[sdmitch]

@davesexcel said:

Hello,
b & d are variables, rise and run are calculated from b & d.

for this example rise=d/6 and run=(b-(1+e))/5

I just put in the numbers so the code can easily be copied and run

As I see the problem then is that points 4 & 5 need to be calculated.

mod = Sketchup.active_model
ent = mod.active_entities
sel = mod.selection
vue = mod.active_view
Sketchup.active_model.entities.clear!
vars = UI.inputbox(["b;","d;"],[51.5,46.5],"Routed Stringer")
if vars
  b,d = vars; e = 0.5
  run = (b-(1+e))/5.0
  rise = d/6.0

  #<<<routed stringer
  group = ent.add_group(); group.name="Routed Stringer"

  ent6 = group.entities
  pts = []

  pts[0] = [0,b-(1+e),d]
  pts[1] = [0,b-(4+e),d]
  pts[2] = [0,-3, rise]
  pts[3] = [0, -3, 0]
  #calculate pts 4 & 5
  vec = pts[2].vector_to(pts[1])
  v = vec.axes[1].reverse
  tpt = pts[2].offset(v,11.25)
  pts[4]=Geom.intersect_line_line [pts[3],[0,1,0]],[tpt,vec]
  #pts[4] = [0,(run+2.5)*0.4256, 0]
  pts[5] = Geom.intersect_line_line [pts[0],[0,0,1]],[tpt,vec]
  #pts[5] = [0, b-(1+e), (d-12 )]

  #add the face to the entities in the model
  face = ent6.add_face pts
end

[davesexcel]

Thanks a lot, I need to work on
Geom.intersect_line_line more

[thomthom]

Using the Geom methods, and the methods on Geom::Point3d, Geom::Vector3d as much as possible is beneficial for performance. The SketchUp API methods are implemented in C++ and will be faster than pure Ruby code.