I am wondering how those of you with wider experience of DCs might deal with this (apparently) simple problem.
Let us say that we want to make a DC for a 2D drawing of the cross section of a steel I beam. Let us further say that we want to limit the number of options to the following:
89 x 152
102 x 178
102 x 203
133 x 203
102 x 254
146 x 254
For simplicity, we will assume that flange and web widths are consistent at 8mm and 6mm respectively.
We only have three elements: top flange; web; bottom flange. The two flanges are identical and the web is always central.
We want the user to be able to choose from the six beam sizes.
We could set up the DC so that the user selects from the four widths and the four heights. The problem comes when you realize that that would give you far more choices than actually exist. And the width is not defined by the height or vice versa.
With the six options above, I cannot think of an elegant way to do it. But I’m sure I must be overlooking something obvious.