Python之外的传说 – matplotlib

概述我试图在matplotlib的情节之外放置一个相当广泛的传奇.这个图例有很多条目,每个条目都可以很长(但我不确切知道多长时间). 显然,这很容易使用 legendHandle = plt.legend(loc = "center left", bbox_to_anchor = (1, 0.5)) 但问题是图例被窗户边缘切断了.我花了很长时间寻找解决方案.到目前为止我能找到的最好的事情是： box 我试图在matplotlib的情节之外放置一个相当广泛的传奇.这个图例有很多条目,每个条目都可以很长(但我不确切知道多长时间).

显然,这很容易使用

legendHandle = plt.legend(loc = "center left",bBox_to_anchor = (1,0.5))

但问题是图例被窗户边缘切断了.我花了很长时间寻找解决方案.到目前为止我能找到的最好的事情是：

Box = ax.get_position()ax.set_position([Box.x0,Box.y0,Box.wIDth * 0.8,Box.height])plt.legend(loc = "center left",0.5))

不幸的是,这并没有真正解决我的问题.由于应用于框宽的显式因子0.8,这仅适用于图形和图例宽度的一个特定组合.如果我调整图形窗口的大小,或者我的图例条目具有不同的长度,则它不起作用.

我只是不明白如何在图中放置一个图例是如此困难.我习惯了Matlab,就像它一样简单

legend('Location','eastoutsIDe')

Python中是否有类似的东西我缺少？

解决方法 尝试了很多,这是我能想到的最好的：

from matplotlib.lines import line2Dfrom matplotlib.grIDspec import GrIDSpecfrom enum import Enumclass Location(Enum):    EastOutsIDe = 1    WestOutsIDe = 2    northOutsIDe = 3    SouthOutsIDe = 4class Legend:    def __init__(self,figure,plotAxes,location: Location):        self.figure = figure        self.plotAxes = plotAxes        self.location = location        # Create a separate subplot for the legend. Actual location doesn't matter - will be modifIEd anyway.        self.legendAxes = figure.add_subplot(1,2,1)        self.legendAxes.clear() # remove old lines        self.legendAxes.set_axis_off()        # Add all lines from the plot to the legend subplot        for line in plotAxes.get_lines():            legendline = line2D([],[])            legendline.update_from(line)            self.legendAxes.add_line(legendline)        if self.location == Location.EastOutsIDe:            self.legend = self.legendAxes.legend(loc = "center left")        elif self.location == Location.WestOutsIDe:            self.legend = self.legendAxes.legend(loc = "center right")        elif self.location == Location.northOutsIDe:            self.legend = self.legendAxes.legend(loc = "lower center")        elif self.location == Location.southOutsIDe:            self.legend = self.legendAxes.legend(loc = "upper center")        else:            raise Exception("UnkNown legend location.")        self.UpdateSize()        # Recalculate legend size if the size changes        figure.canvas.mpl_connect('resize_event',lambda event: self.UpdateSize())    def UpdateSize(self):        self.figure.canvas.draw() # draw everything once in order to get correct legend size        # Extract legend size in percentage of the figure wIDth        legendSize = self.legend.get_window_extent().inverse_transformed(self.figure.transfigure)        legenDWIDth = legendSize.wIDth        legendHeight = legendSize.height        # Update subplot such that it is only as large as the legend        if self.location == Location.EastOutsIDe:            grIDspec = GrIDSpec(1,wIDth_ratios = [1 - legenDWIDth,legenDWIDth])            legendLocation = 1            plotLocation = 0        elif self.location == Location.WestOutsIDe:            grIDspec = GrIDSpec(1,wIDth_ratios = [legenDWIDth,1 - legenDWIDth])            legendLocation = 0            plotLocation = 1        elif self.location == Location.northOutsIDe:            grIDspec = GrIDSpec(2,1,height_ratios = [legendHeight,1 - legendHeight])            legendLocation = 0            plotLocation = 1        elif self.location == Location.southOutsIDe:            grIDspec = GrIDSpec(2,height_ratios = [1 - legendHeight,legendHeight])            legendLocation = 1            plotLocation = 0        else:            raise Exception("UnkNown legend location.")        self.legendAxes.set_position(grIDspec[legendLocation].get_position(self.figure))        self.legendAxes.set_subplotspec(grIDspec[legendLocation]) # to make figure.tight_layout() work if that's desired        self.plotAxes.set_position(grIDspec[plotLocation].get_position(self.figure))        self.plotAxes.set_subplotspec(grIDspec[plotLocation]) # to make figure.tight_layout() work if that's desired

在我到目前为止测试的情况下,这使得图例或多或少都没有.用法是例如

import matplotlib.pyplot as pltplt.ion()figure = plt.figure()plotAxes = figure.gca()plotAxes.plot([1,3],[4,5,6],"b-",label = "Testaaaaaaaaaaaaaa 1")plotAxes.plot([1,[6,4],"r-",label = "Test 2")legend = Legend(figure,Location.EastOutsIDe)

让我问一下我在评论中发布的问题……我将如何建议将其作为matplotlib开发人员的附加功能？ (不是我的黑客,而是在图中有传说的本地方式)

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