I would like to display a Sketchup::DimensionLinear object right in the middle of a rectangle. For example, the following code:
ents = Sketchup.active_model.entities
ents.add_face([0, 0], [100, 0], [100, 200], [0, 200])
ents.add_dimension_linear([50, 0, 0], [50, 200, 0], [1, 0, 0])
ents.add_edges([50, 0, 0], [50, 200, 0])
creates a rectangle face with a vertical edge in the middle, but the dimension is offset a little bit to the right.
Is it possible to display the dimension on the vertical axis of this rectangle without having to adjust the endpoints? Changing [50, 0, 0] and [50, 200, 0] to [49, 0, 0] and [49, 200, 0] does the trick, but that feels more like a hack than a proper solution.
Because the length of the offset vector (which you supplied as the 3rd argument to add_dimension_linear,) is 1 inch and points in the x direction.
The docs describe the offset vector as:
- offset_vector (Geom::Vector3d) —
the parallel offset vector from the reference line to the dimension line measured from the ‘start’ reference point.
Well the obvious question for this case would be:
- Does the factory method accept a zero length offset vector argument ?
Trying …
ents.add_dimension_linear([50, 0, 0], [50, 200, 0], [0, 0, 0])
… produces …
#<ArgumentError: Invalid elements in the array.>
… so the answer is no.
The closest you can get is:
ents.add_dimension_linear([50, 0, 0], [50, 200, 0], [0.001, 0, 0])
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Oh, wow. I don’t know why I was under the impression that the 3rd argument must be a vector of magnitude 1… Thanks again, Dan!
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If you are adding a series of dimensions from the same baseline, then each offset would be larger than the previous (according to whatever drafting standard is applied.)
