Line on a map projection not plotted correctly

[JeremyBloxham]

Description

When plotting a line on a projection, 360 degrees gets added to the longitude of each point, except the first, resulting in the line wrapping around the globe between the first and second points.

Steps to reproduce

import proplot as pplt
lons = [307., 292., 280., 269., 259., 249., 239., 228.]
lats = [ 51., 32., 11., -8., -24., -36., -46., -54.]
fig, ax = pplt.subplots(proj='cyl',basemap=False, width=20, height=12, proj_kw={'lon_0': 180})
ax.plot(lons, lats)

Expected behavior: line without 360 degree warp

Actual behavior: first point wrapped 360 degrees.

Equivalent steps in matplotlib

Please make sure this bug is related to a specific proplot feature. If you're not sure, try to replicate it with the native matplotlib API. Matplotlib bugs belong on the matplotlib github page.

# your code here, if applicable

Proplot version

3.3.3. 0.8.1

[lukelbd]

This was due to unnecessary normalization of 1D geographic data attempting to make it "monotonic". This supposedly would prevent the exact situation shown in your example, but ended up causing it because the algorithm was full of holes. Have fixed the issue by simply removing that bit of code (c8a8faa).