MultiBC not working with TrajectoryCalc about py-ballisticcalc HOT 3 CLOSED

I checked in a new implementation here: dbookstaber@bd0d3c9

However I'm having trouble getting the Cython to run in my dev environment, and the GitHub tests are having trouble with the numpy reference in drag_model.py.

I think that in order to use the old MBC tests we have to add the following functionality: When weight and diameter are provided, back those out of the BCs and only apply the form factor to the CD. Then the DragModel.drag_table will be the CD*i and we will have a constant BC = sectional_density.

from py-ballisticcalc.

Per discussion, for multi-BC functionality we will provide a global method to return a DragModel instance with the interpolation and BC extraction completed. This saves us the trouble of implementing that piece in Cython.

Also, implement our own linear interpolation so that we have no dependency on numpy.

Also use NamedTuples whenever possible instead of dataclasses for speed.

from py-ballisticcalc.

Numpy dependency removed here: dbookstaber@8f19035

TBD:

1. Separate multi-BC functionality from DragModel class.
2. When weight and diameter are provided, back those out of the BCs and only apply the form factor to the CD.
3. Verify and restore previous test_mbc.py tests if that's how they worked.

from py-ballisticcalc.