Help on scale

shirazbj

Hi,

I use the following code to draw a r=100 cyclinder. With the SketchUp runing in Archi mm template, what I got is a r=5080 cyclinder which is 25.4 times bigger. Thought it is in inch.

I was wondering should I specify what template to use in my code? If so, how to do that?

Thanks in advance

Cean

def my_cylinder

    x=0
    y=0
    z=0
    idir=1
    r=100
    h=500
    
    model = Sketchup.active_model
    
    $entities=model.entities
    
    p1 = Geom;;Point3d.new(x,y,z)
    vector= Geom;;Vector3d.new(1,0,10)

    circleI = $entities.add_circle p1, vector, r
    base = $entities.add_face circleI
    base.pushpull h


end #def hw_cylinder

UI.menu("Plugins").add_item("my") { my_cylinder }

shirazbj

Thanks Dan. So, I was right. It was in inch.

It's a bit hard to understand the API:
"
The mm method is used to convert a number to millimeters.

It returns a Length value which is the same length as the given value. For example len = 25.4.mm returns 1 inch.

Returns:

mm
    a value in millimeters if successful

 value = 10
 mm = value.mm

"

The result is the same length but with a different unit.

TIG

In the API a 'raw' number is always taken to be in inches when in the context of a 'length' so 500 is taken as 500".
To get it to be taken as 'mm' you write it as 500.mm [or 50.cm if you prefer 'cm' etc...]

For 'angles' a 'raw' number is assumed to be 'radians' - but you can use 90.degrees to set an angle you can readily understand... otherwise it'd have to be expressed as the more awkward Math::PI/2 to be the equivalent in radians!

Dan Rathbun

See the API on classes:

If you want the radius of the cylinder to be 100mm, then in Ruby:
r = 100.mm puts(r)

3.93700787401575

.

Dan Rathbun

Yes.. Sketchup and the Ruby API use Inches internally.

The "User Units" are only for display in dialogs.

shirazbj

Instead of writing every 'mm' in code, I thought it's more easy to draw as it is and scale back at the end.

That also cleared me from inserting a DWG file, need scale back to get the dimensions show in right number.

Thanks.

TIG

@shirazbj said:

Instead of writing every 'mm' in code, I thought it's more easy to draw as it is and scale back at the end. That also cleared me from inserting a DWG file, need scale back to get the dimensions show in right number.
Thanks.

An imported DWG will use whatever units it has set in the import 'options' dialog opened from the main DWG import browser, So you can rely on that to always be correct.