表格中的 Matplotlib 文本对齐 [英] Matplotlib Text Alignment in Table

问题描述

我正在努力使文本正确地向左/向右对齐，而不会浪费列中的空间.中心/左/右使用相同的列宽:

1. 要克服此问题，需要将相关列的填充设置为较低的值，因为对于所有其他列，实际上需要10％.没有内置的选项可以设置填充，但是可以通过在列的单元格上循环并更改相应的 PAD 属性来对其进行操作.

     def set_pad_for_column(col，pad = 0.1):单元格 = the_table.get_celld()列= [如果cell [1] == col，则the_table.get_celld()中单元格的单元格]对于列中的单元格:cells [cell] .PAD = padset_pad_for_column(col = 1，pad = 0.01)

   这仅对第二列( col = 1 )产生1％的填充.

   I am struggling to left/right align text properly without having wasted space in the columns. The same col widths are being used for center/left/right:

   1. Center aligned: properly centered, ok
   2. Left aligned: wasted space on the left
   3. Even with omitting colWidths as table argument and playing around with my favorite solution the_table._autoColumns = range (-1,len (colLabels)) does not improve the situation

   What am I doing wrong? Is this a bug in matplotlib?

   Best Regards, René

   import pandas as pd 
   import matplotlib.pyplot as plt
   
   size_x, size_y = 12, 4
   fig = plt.figure (figsize=(size_x, size_y))
   ax  = fig.add_subplot(111)
   
   col_ID    = pd.Series ([ "R001", "R002", "R003", "R005", "R006", "R007" ])
   col_Title = pd.Series ([ 50*"*", 10*"-", 70*"x", "R005", "R006", "R007" ])
   col_x     = pd.Series ([  3,      1,      3,      4,      2,      3 ])
   col_y     = pd.Series ([  4,      2,      3,      2,      4,      3 ])
   
   legend_df = pd.DataFrame ({ "ID"    : col_ID,
                               "Title" : col_Title,
                               "X-Pos" : col_x,
                               "Y-Pos" : col_y,
                               "Value" : col_x * col_y })
   rowLabels = legend_df.index
   colLabels = legend_df.columns
   cellText  = legend_df.values
   
   # Center-Aligned text looks ok
   the_table = plt.table (cellText=cellText, rowLabels=rowLabels, colLabels=colLabels, loc='upper center', cellLoc="center", colWidths=[0.05, 0.52, 0.05, 0.05, 0.05, 0.05])
   
   # Bogus: Same colWidths, but left OR right aligned -> unwanted space in title column
   # the_table = ax.table (cellText=cellText, rowLabels=rowLabels, colLabels=colLabels, loc='upper center', cellLoc="left", colWidths=[0.05, 0.52, 0.05, 0.05, 0.05, 0.05])
   
   the_table.auto_set_font_size(False)
   the_table.set_fontsize (8)
   
   # Set col width automatically
   # the_table._autoColumns = range (-1,len (colLabels))
   
   ax.xaxis.set_visible (False)                                            # Grafik-Achsen ausschalten, wir wollen nur Plot
   ax.yaxis.set_visible (False)
   # the_table.scale(2, 2) 
   
   plt.show()
   

   解决方案

   Per default the cells have a 10% padding to both sides, which is useful to let the text start a bit next to the table cell border. For very large cells 10% is then too much and leads to the undesired large space.

   To overcome this, one would need to set the padding for the column in question to a lower value, as for all other columns 10% is actually desireable. There is no built-in option to set the padding, but one may manipulate it by looping over the cells of the column and changing the respective PAD attribute.

   def set_pad_for_column(col, pad=0.1):
       cells = the_table.get_celld()
       column = [cell for cell in the_table.get_celld() if cell[1] == col]
       for cell in column:
           cells[cell].PAD = pad
   
   set_pad_for_column(col=1, pad=0.01) 
   

   This produces a padding of 1% only for the second column (col=1).

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