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Figure.plot fails to plot lines correctly #255

@seisman

Description

@seisman

Description of the problem

Figure.plot() doesn't plot simple lines correctly.

Full code that generated the error

import pygmt

fig = pygmt.Figure()
fig.basemap(J="X8c/8c", R="-10/10/0/10", B=True)
fig.plot(x=[0.0, 0.0], y=[0, 10], W="1p,gray,-")
fig.plot(x=[5.0, 5.0], y=[2, 8], W="1p,gray,-")
fig.plot(x=[3.0, 8.0], y=[0, 10], W="1p,gray,-")
fig.show(method="external")

Output plot
plot-lines-fail

Only the first line is correct. The other two lines are wrong.

System information

  • Operating system: macOS
  • Python installation (Anaconda, system, ETS): Anaconda
  • Version of GMT: 6.0.0_15a9160
  • Version of Python: 3.7.0
  • Version of this package: latest
  • If using conda, paste the output of conda list below

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    bugSomething isn't workingupstreamBug or missing feature of upstream core GMT

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