我正在使用matplotlibs主轴线在图形上画垂直线。我想把垂直线上的标签直接放在图表上,而不是在图例中。在
我希望我的图表在垂直线上有标签,如下所示:
如果我放大某个部分,我希望垂直线标签相应地移动,这样它们在屏幕上仍然可见。像这样:
有人能帮我吗?我们将不胜感激!在
目前我的代码如下:
from astropy.io import fits
from astropy.utils.data import download_file
from astropy.table import Table
import matplotlib.pyplot as plt
import numpy as np
class Spectrum:
# Let's download the data to plot
def __init__(self, url):
self.url = url
self.hdu_list = fits.open(download_file(url, cache=True), memmap=False)
# Now lets plot the data
def plot_spectra(self):
x = np.array(Table(self.hdu_list[1].data).columns[1])
x = 10 ** x
y = np.array(Table(self.hdu_list[1].data).columns[0])
plt.plot(x, y, 'k', lw=1)
# Now lets plot the vertical lines, AND THIS IS WHERE I WANT TO ADD LABELS.
def plot_spectral_types(self):
my_type = input("Please enter the spectral type to plot (o, b, a, or f): ")
if my_type is 'o':
my_type = o_type
elif my_type is 'b':
my_type = b_type
elif my_type is 'a':
my_type = a_type
elif my_type is 'f':
my_type = f_type
element, wavelength = zip(*my_type)
# Each vertical line's x value is a wavelength.
# I want the vertical line's label to be the corresponding element.
for i in wavelength:
plt.axvline(linewidth=0.25, color='r', x=i)
o_type = [
('NIII', 4097),
('SiIV', 4089),
('H', 4340.5),
('HeI', 4471),
('HeII', 4541),
('NIII', 4632),
('NIII', 4640),
('CIII', 4650),
('HeII', 4686)
]
b_type = [
('SiIV', 4089),
('H', 4101.7),
('HeI', 4121),
('SiII', 4128),
('SiII', 4131),
('H', 4340.5),
('HeI', 4471),
('CIII', 4540),
('HeII', 4541),
('CIII', 4650),
('H', 4861.33)
]
a_type = [
('CaII (K)', 3933.70),
('CaII', 3968.50),
('H', 3970.10),
('H', 4101.70),
('HeI', 4121.00),
('SiII', 4128.00),
('SiII', 4131.00),
('FeI', 4299.00),
('FeI', 4303.00),
('TiII', 4303.00),
('H', 4340.50),
('MgII', 4481.00),
('H', 4861.30),
('H', 6562.70)
]
f_type = [
('CaII', 3933.70),
('CaII', 3968.50),
('H', 3970.10),
('H', 4101.70),
('HeI', 4121.00),
('SiII', 4128.00),
('SiII', 4131.00),
('CaI', 4227.00),
('FeI', 4299.00),
('FeI', 4303.00),
('H', 4340.50),
('CH', 4314.00),
('MgII', 4481.00),
('H', 4861.30),
('H', 6562.70)
]
默认情况下,文本标签位于data-coordinates中,这可能是您遇到的问题。可以将y值转换为图形坐标,即在缩放时相对于当前轴的坐标,并将x坐标保留为数据坐标。一个更独立(见MCVE)的例子:
原图。请注意,前两个标签分别位于图的中间位置和图片上方的四分之一处:
放大后,这些标签已随缩放的x轴正确移动,但仍在图形的一半位置和图形的四分之一处:
相关问题 更多 >
编程相关推荐