我试图运行下面所示的代码(我从这个源代码中获得的)来在Baseman对象中引入饼状图。
import math
import numpy as np
import matplotlib.pyplot as plt
from mpl_toolkits.basemap import Basemap
colors = ['red','blue','green','yellow','magenta','purple']
def draw_pie(ax,ratios=[0.4,0.3,0.3], X=0, Y=0, size = 1000):
N = len(ratios)
xy = []
start = 0.
for ratio in ratios:
x = [0] + np.cos(np.linspace(2*math.pi*start,2*math.pi*(start+ratio), 30)).tolist()
y = [0] + np.sin(np.linspace(2*math.pi*start,2*math.pi*(start+ratio), 30)).tolist()
xy1 = zip(x,y)
xy.append(xy1)
start += ratio
for i, xyi in enumerate(xy):
ax.scatter([X],[Y] , marker=(xyi,0), s=size, facecolor=colors[i] )
#ax.scatter([X],[Y] , marker=(2,0), s=size, facecolor=colors[i] )
fig = plt.figure(figsize=(11.7,8.3))
#Custom adjust of the subplots
plt.subplots_adjust(left=0.05,right=0.95,top=0.90,bottom=0.05,wspace=0.15,hspace=0.05)
ax = plt.subplot(111)
#Let's create a basemap around Belgium
m = Basemap(resolution='i',projection='merc', llcrnrlat=49.0,urcrnrlat=52.0,llcrnrlon=1.,urcrnrlon=8.0,lat_ts=51.0)
m.drawcountries(linewidth=0.5)
m.drawcoastlines(linewidth=0.5)
X,Y = m(4.5,50.5)
draw_pie(ax,[0.5,0.25,0.25], X, Y,size=300)
plt.savefig('test.png')
plt.savefig('test.pdf')
但是，提供的代码会产生以下错误:
---------------------------------------------------------------------------
TypeError Traceback (most recent call last)
<ipython-input-180-1520446b93e5> in <module>
27
28 X,Y = m(4.5,50.5)
---> 29 draw_pie(ax,[0.5,0.25,0.25], X, Y,size=300)
30 plt.savefig('test.png')
31 plt.savefig('test.pdf')
<ipython-input-180-1520446b93e5> in draw_pie(ax, ratios, X, Y, size)
15
16 for i, xyi in enumerate(xy):
---> 17 ax.scatter([X],[Y] , marker=(xyi,0), s=size, facecolor=colors[i] )
18
19 fig = plt.figure(figsize=(11.7,8.3))
~/opt/anaconda3/lib/python3.8/site-packages/matplotlib/__init__.py in inner(ax, data, *args, **kwargs)
1445 def inner(ax, *args, data=None, **kwargs):
1446 if data is None:
-> 1447 return func(ax, *map(sanitize_sequence, args), **kwargs)
1448
1449 bound = new_sig.bind(ax, *args, **kwargs)
~/opt/anaconda3/lib/python3.8/site-packages/matplotlib/cbook/deprecation.py in wrapper(*inner_args, **inner_kwargs)
409 else deprecation_addendum,
410 **kwargs)
--> 411 return func(*inner_args, **inner_kwargs)
412
413 return wrapper
~/opt/anaconda3/lib/python3.8/site-packages/matplotlib/axes/_axes.py in scatter(self, x, y, s, c, marker, cmap, norm, vmin, vmax, alpha, linewidths, verts, edgecolors, plotnonfinite, **kwargs)
4471 marker_obj = marker
4472 else:
-> 4473 marker_obj = mmarkers.MarkerStyle(marker)
4474
4475 path = marker_obj.get_path().transformed(
~/opt/anaconda3/lib/python3.8/site-packages/matplotlib/markers.py in __init__(self, marker, fillstyle)
226 self._marker_function = None
227 self.set_fillstyle(fillstyle)
--> 228 self.set_marker(marker)
229
230 def _recache(self):
~/opt/anaconda3/lib/python3.8/site-packages/matplotlib/markers.py in set_marker(self, marker)
311 if not isinstance(marker, MarkerStyle):
312 self._marker = marker
--> 313 self._recache()
314
315 def get_path(self):
~/opt/anaconda3/lib/python3.8/site-packages/matplotlib/markers.py in _recache(self)
239 self._capstyle = 'butt'
240 self._filled = True
--> 241 self._marker_function()
242
243 def __bool__(self):
~/opt/anaconda3/lib/python3.8/site-packages/matplotlib/markers.py in _set_tuple_marker(self)
370 symstyle = marker[1]
371 if symstyle == 0:
--> 372 self._path = Path.unit_regular_polygon(numsides)
373 self._joinstyle = 'miter'
374 elif symstyle == 1:
~/opt/anaconda3/lib/python3.8/site-packages/matplotlib/path.py in unit_regular_polygon(cls, numVertices)
711 centered at (0, 0).
712 """
--> 713 if numVertices <= 16:
714 path = cls._unit_regular_polygons.get(numVertices)
715 else:
TypeError: '<=' not supported between instances of 'zip' and 'int'
我找到了问题所在
ax.scatter([X],[Y] , marker=(xyi,0), s=size, facecolor=colors[i] )
xyi是"形状";将模拟饼状图中的饼状块的多边形，但标记器不接受。如果将xyi替换为int(就像在注释行中一样)，脚本将运行而不会出现错误，但是当然，不会出现饼状图……显然，marker在这个位置只接受整数。不是一个列表或zip文件(就像现在的情况)。
我已经搜索了这个特定的标记是如何工作的，但无法理解它是如何操作的，因此无法纠正脚本使其工作。有办法纠正这个错误吗?
您提供的源代码创建于2010年。从那以后，Matplotlib发生了很大的变化。您的draw_pie函数现在可以替换为:
def draw_pie(ax, ratios=[0.4, 0.3, 0.3], X=0, Y=0, size=1):
ax.pie(ratios,center=(X, Y), radius=size, frame=True)
你的代码应该使用:
fig = plt.figure(figsize=(11.7,8.3))
#Custom adjust of the subplots
plt.subplots_adjust(left=0.05,right=0.95,top=0.90,bottom=0.05,wspace=0.15,hspace=0.05)
ax = plt.subplot(111)
#Let's create a basemap around Belgium
m = Basemap(resolution='i',projection='merc', llcrnrlat=49.0,urcrnrlat=52.0,llcrnrlon=1.,urcrnrlon=8.0,lat_ts=51.0)
m.drawcountries(linewidth=0.5)
m.drawcoastlines(linewidth=0.5)
X,Y = m(4.5,50.5)
draw_pie(ax,[0.5,0.25,0.25], X, Y,size=3)
plt.savefig('test.png')
plt.savefig('test.pdf')