Python 中的 matplotlib.artist.artist.get_transform()
原文:https://www.geesforgeks.org/matplotlib-artist-artist-get_transform-in-python/
【Matplotlib】是 Python 中的一个库,它是 NumPy 库的数字-数学扩展。 艺术家类 包含将渲染到图形画布中的对象的抽象基类。图形中所有可见的元素都是艺术家的子类。
matplotlib.artist.artist.get_transform()方法
matplotlib 库的艺术家模块中的 get_transform()方法用于获取该艺术家使用的 Transform 实例
句法: 艺术家。get_transform(self)
参数:此方法不接受任何参数。
返回:该方法返回该艺术家使用的变换实例
以下示例说明了 matplotlib 中的 matplotlib.artist.artist.get_transform()函数:
例 1:
# Implementation of matplotlib function
from matplotlib.artist import Artist
import numpy as np
import matplotlib.pyplot as plt
import matplotlib.transforms as mtransforms
fig, ax = plt.subplots()
l1, = ax.plot([0.1, 0.5, 0.9],
[0.1, 0.9, 0.5],
"bo-")
l2, = ax.plot([0.1, 0.5, 0.9],
[0.5, 0.2, 0.7],
"ro-")
for l in [l1, l2]:
xx = l.get_xdata()
yy = l.get_ydata()
shadow, = ax.plot(xx, yy)
shadow.update_from(l)
ot = mtransforms.offset_copy(Artist.get_transform(l),
ax.figure,
x = 4.0, y =-6.0,
units ='points')
shadow.set_transform(ot)
plt.title("""matplotlib.artist.Artist.get_transform()
function Example""", fontweight="bold")
plt.show()
输出:
例 2:
# Implementation of matplotlib function
from matplotlib.artist import Artist
import matplotlib.pyplot as plt
from matplotlib import collections, colors, transforms
import numpy as np
nverts = 50
npts = 100
r = np.arange(nverts)
theta = np.linspace(0, 2 * np.pi, nverts)
xx = r * np.sin(theta)
yy = r * np.cos(theta)
spiral = np.column_stack([xx, yy])
rs = np.random.RandomState(19680801)
xyo = rs.randn(npts, 2)
colors = [colors.to_rgba(c)
for c in plt.rcParams['axes.prop_cycle'].by_key()['color']]
fig, ax1 = plt.subplots()
col = collections.RegularPolyCollection(
7, sizes = np.abs(xx) * 10.0,
offsets = xyo,
transOffset = ax1.transData)
trans = transforms.Affine2D().scale(fig.dpi / 72.0)
Artist.set_transform(col, trans)
ax1.add_collection(col, autolim = True)
col.set_color(colors)
plt.title("""matplotlib.artist.Artist.set_transform()
function Example""", fontweight="bold")
plt.show()
输出:
Value Return by get_transform() :
Affine2D(
[[1.38888889 0\. 0\. ]
[0\. 1.38888889 0\. ]
[0\. 0\. 1\. ]])