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patches.Arc objects randomly drawing the full ellipse #9659

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@scnorton

Description

@scnorton

Bug report

Bug summary

Providing theta1 and theta2 to the Arc constructor sometimes causes the arc to be drawn as the full ellipse.

Code for reproduction

from matplotlib.patches import Arc
import matplotlib.pyplot as plt

patches = [
    Arc((143954140, 374), 476, 476, theta1=0, theta2=180),
    Arc((143954902, 374), 2001, 749, theta1=0, theta2=180),
    Arc((143955137, 374), 2471, 749, theta1=0, theta2=180),
    Arc((143955276, 374), 2748, 749, theta1=0, theta2=180),
    Arc((143955362, 374), 2022, 749, theta1=0, theta2=180),
    Arc((143955500, 374), 2299, 749, theta1=0, theta2=180),
    Arc((143955641, 374), 488, 488, theta1=0, theta2=180),
    Arc((143955650, 374), 506, 506, theta1=0, theta2=180),
    Arc((143955885, 374), 976, 749, theta1=0, theta2=180),
    Arc((143956128, 374), 489, 489, theta1=0, theta2=180),
    Arc((143956135, 374), 467, 467, theta1=0, theta2=180),
    Arc((143956137, 374), 471, 471, theta1=0, theta2=180),
    Arc((143956276, 374), 748, 748, theta1=0, theta2=180),
    Arc((143956515, 374), 1226, 749, theta1=0, theta2=180),
    Arc((143956167, 374), 412, 412, theta1=0, theta2=180),
    Arc((143956170, 374), 402, 402, theta1=0, theta2=180),
    Arc((143956172, 374), 401, 401, theta1=0, theta2=180),
    Arc((143956183, 374), 380, 380, theta1=0, theta2=180),
    Arc((143956321, 374), 657, 657, theta1=0, theta2=180),
    Arc((143956610, 374), 80, 80, theta1=0, theta2=180),
    Arc((143956849, 374), 558, 558, theta1=0, theta2=180),
    Arc((143956928, 374), 400, 400, theta1=0, theta2=180),
    Arc((143956960, 374), 335, 335, theta1=0, theta2=180),
    Arc((143956962, 374), 331, 331, theta1=0, theta2=180),
    Arc((143957055, 374), 146, 146, theta1=0, theta2=180),
    Arc((143957346, 374), 105, 105, theta1=0, theta2=180),
    Arc((143957397, 374), 207, 207, theta1=0, theta2=180),
    Arc((143957448, 374), 308, 308, theta1=0, theta2=180),
    Arc((143957459, 374), 331, 331, theta1=0, theta2=180),
    Arc((143957475, 374), 363, 363, theta1=0, theta2=180),
    Arc((143957696, 374), 804, 749, theta1=0, theta2=180),
    Arc((143958871, 374), 3154, 749, theta1=0, theta2=180),
    Arc((143957954, 374), 287, 287, theta1=0, theta2=180),
    Arc((143957957, 374), 292, 292, theta1=0, theta2=180),
    Arc((143958125, 374), 628, 628, theta1=0, theta2=180),
    Arc((143958305, 374), 268, 268, theta1=0, theta2=180),
    Arc((143958313, 374), 251, 251, theta1=0, theta2=180),
    Arc((143958368, 374), 142, 142, theta1=0, theta2=180),
    Arc((143958369, 374), 136, 136, theta1=0, theta2=180),
    Arc((143958370, 374), 138, 138, theta1=0, theta2=180),
    Arc((143958905, 374), 535, 535, theta1=0, theta2=180),
    Arc((143959528, 374), 1780, 749, theta1=0, theta2=180),
    Arc((143959543, 374), 1810, 749, theta1=0, theta2=180),
    Arc((143959544, 374), 1813, 749, theta1=0, theta2=180),
    Arc((143959849, 374), 1198, 749, theta1=0, theta2=180),
    Arc((143960119, 374), 658, 658, theta1=0, theta2=180),
    Arc((143960678, 374), 151, 151, theta1=0, theta2=180),
    Arc((143960682, 374), 158, 158, theta1=0, theta2=180),
    Arc((143960682, 374), 159, 159, theta1=0, theta2=180),
    Arc((143960723, 374), 241, 241, theta1=0, theta2=180),
    Arc((143960797, 374), 388, 388, theta1=0, theta2=180),
    Arc((143960845, 374), 484, 484, theta1=0, theta2=180),
    Arc((143960809, 374), 363, 363, theta1=0, theta2=180),
    Arc((143960943, 374), 95, 95, theta1=0, theta2=180),
    Arc((143960945, 374), 92, 92, theta1=0, theta2=180)
]

plt.figure()
ax = plt.gca()
map(ax.add_patch, patches)
plt.xlim(143953697, 143961337)
plt.ylim(-150, 900)
plt.show()

Actual outcome

image

Expected outcome

All the arcs should be half-ellipses above the line y = 0.5.

Matplotlib version

  • Operating system: Mac OS Sierra
  • Matplotlib version: 2.1.0
  • Matplotlib backend (print(matplotlib.get_backend())): MacOSX
  • Python version: 2.7.14 (Homebrew)
  • Jupyter version (if applicable):
  • Other libraries: numpy 13.3.3

python 2.7.14 from homebrew (brew install python); matplotlib from pip (sudo -H pip install matplotlib)

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