Resize DC with ruby

GWD

I'm trying to resize a DC with a ruby script. But the result is very strange.

I use the .set_last_size function, and the DC size changes but not to the right size.

Jim

Where is the documentation on .set_last_size?

What happens if you use using a typical scaling Transformation?

TIG

Dan covered the additional methods added by the DC Extension [including that one] here
http://www.sketchucation.com/forums/viewtopic.php?p=293542&sid=5e9cba98370bfa85f9ab7093e95f2894#p293542

TIG

If you use .scaled_size and .unscaled_size these return arrays of the xyz size/scales as original or current.
If you use these values in the .set_last_size() with a modifying * or / for x/y/z values you will see that halving the X doubles LenX and so on - so conversely to double the X use /2. To set the X-length to a new value in 'units' just do the cockeyed math to get the correct factor - e.g. x=10" and you want it to be 20" you find the ratio 10/20, and then apply it to the present scaling factor as a / (as 'manual trials' show... to make it *2 you'd actually use /2 )... [do the "/cm conversions to suit...] It just seems weird

Dan Rathbun

@unknownuser said:

I'm trying to resize a DC with a ruby script. But the result is very strange.

I use the .set_last_size function, and the DC size changes but not to the right size.

The .set_last_size function is an internal method that needs to be called at the correct point in the redraw process depending on various factors, as driven by the DCObservers.

A DynamicComponent is not actually a Ruby class in the instance object sense (although it was written as a Singleton class block, it really could have been written as a module, instead.)

So a DC, is really just a Sketchup::ComponentInstance instance object, that has a specially named AttributeDictionary, ie: "dynamic_attributes" and the DC extension has Observers that "watch for" and react upon objects that have that specially named dictionary.

I suggest you use the normal transform! method to scale or move a DC via Ruby, then if you must force a redraw, call the redraw as you did in your example.
Also, if doing rotational transforms, be sure to do them in x, y, z order.

Morgan74

Hello,

I wrote a small code to add a DC at a specific position and resize it.

So when Sketchup add an instance of a DC its position is 0,0,0. You need to define a transformation to place it where you want.

t1 = Geom;;Transformation.axes(...,...,...)
newDC = Sketchup.active_model.entities.add_instance(Sketchup.active_model.definitions["MyDC"],t1)

To set the length I used the set_attribute method of the DC definition

len = 13
len2 = 12
newDC.definition.set_attribute "dynamic_attributes","_lenx_nominal",len.to_s
newDC.definition.set_attribute "dynamic_attributes","_lenz_nominal",len2.to_s