为什么这个轴或标题不显示？

Question

我正致力于制作极坐标图表，而我却无法了解我想要的一切。

有人可以帮我弄清楚为什么2点钟的轴和标题不会出现吗？任何其他提示，使这看起来更好将不胜感激！这是我的代码：

import numpy as np
import pylab as pl
import matplotlib.pyplot as py

class Radar(object):

    def __init__(self, fig, titles, labels, rect=None):
        if rect is None:
            rect = [0.05, 0.05, 0.95, 0.95]

        self.n = len(titles)
        self.angles = np.arange(90, 90+360, 360.0/self.n)
        self.axes = [fig.add_axes(rect, projection="polar", label="axes%d" % i) 
                         for i in range(self.n)]

        self.ax = self.axes[0]
        self.ax.set_thetagrids(self.angles, labels=titles, fontsize=12, weight="bold")

        for ax in self.axes[1:]:
            ax.patch.set_visible(False)
            ax.grid("off")
            ax.xaxis.set_visible(False)

        for ax, angle, label in zip(self.axes, self.angles, labels):
            ax.set_rgrids(range(1, 7), labels=label, angle=angle, fontsize=12)
            ax.spines["polar"].set_visible(False)
            ax.set_ylim(0, 6) 

    def plot(self, values, *args, **kw):
        angle = np.deg2rad(np.r_[self.angles, self.angles[0]])
        values = np.r_[values, values[0]]
        self.ax.plot(angle, values, *args, **kw)

fig = pl.figure(figsize=(20, 10))

titles = [
    "Canada", "Australia",
    "New Zealand", "Japan", "China", "USA", "Mexico", "Finland", 
]

labels = [
    list("abcde"), list("12345"), list("uvwxy"), 
    [" ", " ", "$156", "$158", "$160"],
    list("jklmn"), list("asdfg"), list("qwert"), [" ", "4.3", "4.4", "4.5", "4.6"]
]

radar = Radar(fig, titles, labels)
radar.plot([1, 3, 2, 5, 4, 5, 3, 3],  "--", lw=1, color="b", alpha=.5, label="USA 2014")
radar.plot([2.3, 2, 3, 3, 2, 3, 2, 4],"-", lw=1, color="r", alpha=.5, label="2014")
radar.plot([3, 4, 3, 4, 2, 2, 1, 3], "-", lw=1, color="g", alpha=.5, label="2013")
radar.plot([4.5, 5, 4, 5, 3, 3, 4, 4], "-", lw=1, color="y", alpha=.5, label="2012")

radar.ax.legend(loc='upper center', bbox_to_anchor=(0.5, -0.10),
          fancybox=True, shadow=True, ncol=4)

fig = py.gcf()
fig.set_size_inches(6, 10, forward=True)
fig.savefig('test2png.png', dpi=100, bbox_inches="tight", pad_inches=1)

以及它产生的图像：

真的很感激任何帮助。

Answer 1

问题在于，当您使用此行定义radar.angles时：

self.angles = np.arange(90, 90+360, 360.0/self.n)

你的最终角度为>360.：

print self.angles
>>> [  90.  135.  180.  225.  270.  315.  360.  405.] 

您只需要以不同方式指定角度，以确保它们都是<=360.

例如，如果您将self.angles的定义更改为：

self.angles = [a if a <=360. else a - 360. for a in np.arange(90, 90+360, 360.0/self.n)]

print self.angles
>>> [  90.  135.  180.  225.  270.  315.  360.  45.]

然后一切正常：