Rounding a value for export with a ":" separator

[Iltis]

Hello,
I'm working on a plugin to export the 2D coordinates of the selected faces. (Okay, with big help from others, I'm newbie in Ruby)

		  # Open a file for writing
		  File.open(filepath, "w"){ |file|
			selection = Sketchup.active_model.selection
			# Get an array of faces that are in the selection.
			faces = selection.grep(Sketchup;;Face) 
			faces.each_with_index{ |face, index|
			  # Write a label for the face.
			  file.puts("Face#{index+1}")
			  # Get a transformation object that translates from model space to 2d space of the face.
			  t = Geom;;Transformation.axes(face.vertices.first.position, *face.normal.axes).inverse
			  # Write all vertices to the file.
			  face.outer_loop.vertices.each{ |vertex|
				# Get the point of the vertex and apply the transformation.
				point = vertex.position.transform(t)
				# Convert the coordinates
				u, v = point.to_a.map{ |c| c.to_f }
				# Write the coordinates to the file.
				file.puts("#{u*25.4};#{v*25.4}")
			  }
			}
		  }

It works, but I have two problems to solve, can you help me?
1 / The numbers close to zero are represented by scientific notation (1e-14), which I have problems to read the text file.
See for example this export of a circle :

Face1
0.0;0.0
6.81483474218631;51.7638090205041
-9.02389274415327e-014;103.527618041008
...
-393.185165257814;51.7638090205041
-386.370330515627;-9.02389274415327e-014
-366.390246014701;-48.236190979496
...
-19.9800845009259;-48.2361909794959

I think I could use the command "sprintf", but I don't know exactly how to write it.

2 / I need to repeat the first point at the end (to close the outline) and I don't know how to properly store this value for reuse.

Thanks for your help.
Renaud.

[TIG]

Try u.to_mm etc on your 'inch' values, so the tolerance is preserved.
Some of your small exponent numbers are in effect 0.0, at least as far a SketchUp's 3d geometry is concerned.
Here are some examples with sprintf...
For example:
1.0.to_mm 25.4 1.0135056009.to_mm 25.74304226286 0.000135056009.to_mm 0.0034304226286 0.00001.to_mm 0.000254 0.0001.to_mm 0.00254 0.000000135056009.to_mm 3.4304226285999997e-06
Then:
sprintf("%.6f", 0.254) 0.254000 sprintf("%.6f", 0.00254) 0.002540 sprintf("%.6f", 0.0000254) 0.000025 sprintf("%.6f", 0.000000254) 0.000000

[driven]

I use the much cruder

file.puts("#{(u*10000*25.4).to_i.to_f/10000};#{(v*10000*25.4).to_i.to_f/10000}")

to return

@unknownuser said:

Face1
0.0:0.0
-3682.0:0.0
-3682.0:-3138.9999
0.0:-3138.9999

[Iltis]

Hello TIG and driven. The solution of driven work good. Thanks a lot!

My second problem is how to code the ********lines in Ruby :

  # Open a file for writing
        File.open(filepath, "w"){ |file|
         selection = Sketchup.active_model.selection
         # Get an array of faces that are in the selection.
         faces = selection.grep(Sketchup;;Face)
         faces.each_with_index{ |face, index|
           # Write a label for the face.
           file.puts("Face#{index+1}")
           # Get a transformation object that translates from model space to 2d space of the face.
           t = Geom;;Transformation.axes(face.vertices.first.position, *face.normal.axes).inverse
           # Write all vertices to the file.
           
        ********* blnFirstPoint=true

           face.outer_loop.vertices.each{ |vertex|
            # Get the point of the vertex and apply the transformation.
            point = vertex.position.transform(t)
            # Convert the coordinates
            u, v = point.to_a.map{ |c| c.to_f }

            ********* if blnFirstPoint=true then
            *********    X1=u
            *********    Y1=v
            *********    blnFirstPoint=false
            ********* end if

            # Write the coordinates to the file.
            file.puts("#{(u*10000*25.4).to_i.to_f/10000};#{(v*10000*25.4).to_i.to_f/10000}")
           }
           ********* file.puts("#{(X1*10000*25.4).to_i.to_f/10000};#{(Y1*10000*25.4).to_i.to_f/10000}")
          }
         } 

It's to close the faces (see the attached picture).
Thanks,
Renaud

---

[TIG]

if blnFirstPoint=**=**true then
Note it is == and NOT = when you are testing a value

• the = assigns the first reference to be the second value, while the == compares two values and returns true/ false in an if test...

Also only use a Capital letter at the start of a Constant, and make your 'variables' starting with lower-case letter.
So it's NOT X1= but x1= etc...

[driven]

the alternate approach is to build an array that includes the start point twice...

   all_points = []
           #add the first at the end as well...
           all_points.push(face.outer_loop.vertices[0..-1]).push(face.outer_loop.vertices[0])
           #then run your code
            all_points.flatten.each{ |vertex|

there are more elegant ways...

john

[Iltis]

OK, this works well :

            begin
		  # Open a file for writing
		  File.open(filepath, "w"){ |file|
			selection = Sketchup.active_model.selection
			# Get an array of faces that are in the selection.
			faces = selection.grep(Sketchup;;Face) 
			faces.each_with_index{ |face, index|
			  # Write a label for the face.
			  file.puts("Face#{index+1}")
			  # Get a transformation object that translates from model space to 2d space of the face.
			  t = Geom;;Transformation.axes(face.vertices.first.position, *face.normal.axes).inverse
			  # Write all vertices to the file.
			  blnFirstPoint = true
			  first_point_u=0
			  first_point_v=0
			    face.outer_loop.vertices.each{ |vertex|
				# Get the point of the vertex and apply the transformation.
				point = vertex.position.transform(t)
				# Convert the coordinates
				u, v = point.to_a.map{ |c| c.to_f }
            if blnFirstPoint==true
				  first_point_u = u
				  first_point_v = v
				  blnFirstPoint = false
				end #if
				# Write the coordinates to the file.
				file.puts("#{(u*10000*25.4).to_i.to_f/10000};#{(v*10000*25.4).to_i.to_f/10000}")
	            } 
			  file.puts("#{(first_point_u*10000*25.4).to_i.to_f/10000};#{(first_point_v*10000*25.4).to_i.to_f/10000}")
			  }
		   }

Thanks a lot!
Renaud