海豚

本文例子主要展示了如何使用补丁、路径和转换类绘制和操作给定的顶点和节点的形状。

测试可用。

import matplotlib.cm as cm

import matplotlib.pyplot as plt

from matplotlib.patches import Circle, PathPatch

from matplotlib.path import Path

from matplotlib.transforms import Affine2D

import numpy as np

# Fixing random state for reproducibility

np.random.seed(19680801)

r = np.random.rand(50)

t = np.random.rand(50) * np.pi * 2.0

x = r * np.cos(t)

y = r * np.sin(t)

fig, ax = plt.subplots(figsize=(6, 6))

circle = Circle((0, 0), 1, facecolor='none',

edgecolor=(0, 0.8, 0.8), linewidth=3, alpha=0.5)

ax.add_patch(circle)

im = plt.imshow(np.random.random((100, 100)),

origin='lower', cmap=cm.winter,

interpolation='spline36',

extent=([-1, 1, -1, 1]))

im.set_clip_path(circle)

plt.plot(x, y, 'o', color=(0.9, 0.9, 1.0), alpha=0.8)

# Dolphin from OpenClipart library by Andy Fitzsimon

#

#

#

#

#

dolphin = """

M -0.59739425,160.18173 C -0.62740401,160.18885 -0.57867129,160.11183

-0.57867129,160.11183 C -0.57867129,160.11183 -0.5438361,159.89315

-0.39514638,159.81496 C -0.24645668,159.73678 -0.18316813,159.71981

-0.18316813,159.71981 C -0.18316813,159.71981 -0.10322971,159.58124

-0.057804323,159.58725 C -0.029723983,159.58913 -0.061841603,159.60356

-0.071265813,159.62815 C -0.080250183,159.65325 -0.082918513,159.70554

-0.061841203,159.71248 C -0.040763903,159.7194 -0.0066711426,159.71091

0.077336307,159.73612 C 0.16879567,159.76377 0.28380306,159.86448

0.31516668,159.91533 C 0.3465303,159.96618 0.5011127,160.1771

0.5011127,160.1771 C 0.63668998,160.19238 0.67763022,160.31259

0.66556395,160.32668 C 0.65339985,160.34212 0.66350443,160.33642

0.64907098,160.33088 C 0.63463742,160.32533 0.61309688,160.297

0.5789627,160.29339 C 0.54348657,160.28968 0.52329693,160.27674

0.50728856,160.27737 C 0.49060916,160.27795 0.48965803,160.31565

0.46114204,160.33673 C 0.43329696,160.35786 0.4570711,160.39871

0.43309565,160.40685 C 0.4105108,160.41442 0.39416631,160.33027

0.3954995,160.2935 C 0.39683269,160.25672 0.43807996,160.21522

0.44567915,160.19734 C 0.45327833,160.17946 0.27946869,159.9424

-0.061852613,159.99845 C -0.083965233,160.0427 -0.26176109,160.06683

-0.26176109,160.06683 C -0.30127962,160.07028 -0.21167141,160.09731

-0.24649368,160.1011 C -0.32642366,160.11569 -0.34521187,160.06895

-0.40622293,160.0819 C -0.467234,160.09485 -0.56738444,160.17461

-0.59739425,160.18173

"""

vertices = []

codes = []

parts = dolphin.split()

i = 0

code_map = {

'M': (Path.MOVETO, 1),

'C': (Path.CURVE4, 3),

'L': (Path.LINETO, 1)}

while i < len(parts):

code = parts[i]

path_code, npoints = code_map[code]

codes.extend([path_code] * npoints)

vertices.extend([[float(x) for x in y.split(',')] for y in

parts[i + 1:i + npoints + 1]])

i += npoints + 1

vertices = np.array(vertices, float)

vertices[:, 1] -= 160

dolphin_path = Path(vertices, codes)

dolphin_patch = PathPatch(dolphin_path, facecolor=(0.6, 0.6, 0.6),

edgecolor=(0.0, 0.0, 0.0))

ax.add_patch(dolphin_patch)

vertices = Affine2D().rotate_deg(60).transform(vertices)

dolphin_path2 = Path(vertices, codes)

dolphin_patch2 = PathPatch(dolphin_path2, facecolor=(0.5, 0.5, 0.5),

edgecolor=(0.0, 0.0, 0.0))

ax.add_patch(dolphin_patch2)

plt.show()

效果如下：

总结

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