[英]How to assign specific colors to specific cells in a Matplotlib table?
[英]Matplotlib - Assign specific colors to a surface
這段代碼將生成以下兩張圖片,代表一個復雜的函數。 是否可以將第一張圖像的顏色應用於表面? 如果是這樣,如何?
import numpy as np
import matplotlib.pyplot as plt
from matplotlib.colors import hsv_to_rgb
def saw_func(x, dx, a, b):
x = x / dx - np.floor(x / dx)
return a + (b - a) * x
def domain_coloring(mag, arg, phaseres=20):
arg[arg < 0] += 2 * np.pi
arg /= (2 * np.pi)
blackp = saw_func(arg, 1 / phaseres, 0.75, 1)
blackm = saw_func(np.log(mag), 2 * np.pi / phaseres, 0.75, 1)
black = blackp * blackm
H = arg
S, V = np.ones_like(H), black
return (hsv_to_rgb(np.dstack([H, S, V])) * 255).astype(np.uint8)
x = y = np.linspace(-2, 2, 500)
x, y = np.meshgrid(x, y)
z = x + 1j * y
f = (z - 1) / (z**2 + z + 1)
mag, arg = np.absolute(f), np.angle(f)
img = domain_coloring(mag, arg)
fig1, ax1 = plt.subplots()
ax1.imshow(
img,
extent = [np.amin(x), np.amax(x), np.amin(y), np.amax(y)],
interpolation = "nearest",
origin = "lower",
)
plt.show()
fig2 = plt.figure()
ax2 = fig2.add_subplot(1, 1, 1, projection="3d")
ax2.plot_surface(x, y, mag)
ax2.set_zlim([0, 10])
plt.show()
本教程示例使用參數facecolors=
。 顏色需要是 0 到 1 之間的 rgb 值。示例代碼使用 200x200 網格,因為 500x500 相當慢(並且在漸近線處也有更多的偽影問題)。 rstride
和cstride
設置為1
作為默認plot_surface
跳過點。
import numpy as np
import matplotlib.pyplot as plt
from matplotlib.colors import hsv_to_rgb
def saw_func(x, dx, a, b):
x = x / dx - np.floor(x / dx)
return a + (b - a) * x
def domain_coloring(mag, arg, phaseres=20):
arg[arg < 0] += 2 * np.pi
arg /= (2 * np.pi)
blackp = saw_func(arg, 1 / phaseres, 0.75, 1)
blackm = saw_func(np.log(mag), 2 * np.pi / phaseres, 0.75, 1)
black = blackp * blackm
H = arg
S, V = np.ones_like(H), black
return hsv_to_rgb(np.dstack([H, S, V]))
x = y = np.linspace(-2, 2, 200)
x, y = np.meshgrid(x, y)
z = x + 1j * y
f = (z - 1) / (z**2 + z + 1)
mag, arg = np.absolute(f), np.angle(f)
img = domain_coloring(mag, arg)
fig2 = plt.figure()
ax2 = fig2.add_subplot(1, 1, 1, projection="3d")
ax2.plot_surface(x, y, mag, facecolors=img)
ax2.set_zlim([0, 10])
plt.show()
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