Implement locationAt

[adam-urbanczyk]

This will resolve #389 . This is exposed only at shapes level, I don't think there is a elegant way to use expose this at the fluen api level.

Here is an example of what can be done with this functions. It can be very useful for modeling thread ends.

from cadquery import *

r = cq.Workplane().rect(3,1).extrude(0.1).faces('<Z').val()

s2 = Wire.makeHelix(7,20,5,angle=360).Edges()[0]
show_object(s2)
N = 20
locs = s2.Edges()[0].locations([0] + [i/N for i in range(1,N+1)])

show_object(Compound.makeCompound(r.located(l) for l in locs))

[codecov]

Codecov Report

Merging #404 into master will increase coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #404      +/-   ##
==========================================
+ Coverage   93.52%   93.56%   +0.04%     
==========================================
  Files          19       19              
  Lines        5048     5083      +35     
  Branches      520      523       +3     
==========================================
+ Hits         4721     4756      +35     
  Misses        205      205              
  Partials      122      122              

Impacted Files	Coverage Δ
cadquery/occ_impl/shapes.py	90.67% <100.00%> (+0.23%)	⬆️
tests/test_cadquery.py	98.97% <100.00%> (+0.01%)	⬆️

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[jmwright]

Looks good, thanks!

[adam-urbanczyk]

OK, merging.