我有一个网站,根据可用的数据站点运行情况,会产生任意数量的图表(作为图像),这些图表垂直堆叠在一起。以下是一个示例:
问题在于,根据垂直图的数量,suptitle
(顶部标题)会位于不同的位置。请查看以下5个和10个绘图示例:5个绘图:
这里有10个图表:
对于每个图形数量,我得到不同的结果。使用fig.tight_layout()
没有帮助。我需要的是让我的文本底部与图形顶部相隔一定距离。这个问题有一个通用的解决方案吗?
我创建了一些最小化的工作代码,其中包含参数化的图形数量。如果您想要重现这个问题,请查看它。
import datetime
import random
import matplotlib
matplotlib.use('Agg') # Force matplotlib not to use any Xwindows backend.
import matplotlib.pyplot as plt
import matplotlib.dates as mdates
import matplotlib.image as mpimg
import matplotlib.gridspec as gridspec
import numpy as np
random.seed(datetime.datetime.now())
#initial parameters
numOfPlots = 2
dataLen = 100
randomRange = 10*dataLen
dpiVal = 180
#create data
xData = list(range(dataLen) for x in range(numOfPlots))
yData = list(random.sample(range(randomRange), dataLen) for x in range(numOfPlots))
#matplotlib initialize plot
gs = gridspec.GridSpec(numOfPlots,1)
plt.cla()
plt.clf()
fig = plt.figure()
ax = None
for i in list(range(numOfPlots)):
if i == 0:
ax = fig.add_subplot(gs[i])
else:
ax = fig.add_subplot(gs[i],sharex=ax)
ax.plot(xData[i], yData[i])
labelSize = 10
ax.set_ylabel("Hi there",size=8)
ax.get_yaxis().set_label_coords(-0.07,0.5)
plt.yticks(size=8)
plt.ticklabel_format(style='sci', axis='y', scilimits=(0,0),useOffset=True)
plt.subplots_adjust(hspace = 0.3)
if i == numOfPlots-1:
plt.xticks(rotation=0,size=7)
max_xticks = 10
xloc = plt.MaxNLocator(max_xticks)
ax.xaxis.set_major_locator(xloc)
ax=plt.gca()
else:
plt.tick_params(
axis='x', # changes apply to the x-axis
labelbottom='off') # labels along the bottom edge are off
ax_right = ax.twinx()
ax_right.yaxis.set_ticks_position('right')
ax_right.set_ylabel("Nice to see you!",size=labelSize)
ax_right.get_yaxis().set_ticks([])
#the following sets the size and the aspect ratio of the plot
fig.set_size_inches(10, 1.8*numOfPlots)
fig.suptitle("Hi there, this is the first line\nAnd this is the second!!!")
fig.savefig("img_"+str(numOfPlots)+".png",bbox_inches='tight',dpi=dpiVal)