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对于matplotlib子批中的标题,有没有方法将纯色背景扩展到页面的全宽?

subplot matplotlib python-3.x

agftrading · 技术社区 · 6 年前

我有一个包含多个matplotlib子批的页面。我最初通过部署以下代码为这些子批次添加了标题:

title = fig.suptitle('This is a title',horizontalalignment='center',verticalalignment='top')

因此,我使用以下代码设置标题:

fig.text(x=0.5,y=0.97,ha='center',va='top',s='This is a title',color='w',backgroundcolor='blue')

这确实添加了背景色,但它只延伸到文本本身之外,如所附图像所示。

有没有一种方法可以直接写在图形画布上,即用图suptitle或者图文本方法。对其他实现目标的解决方案持开放态度,但我希望避免将子批次ax对象本身作为标题部署(这似乎有点粗糙)。

谢谢!

*更新*

我已尝试部署以下代码:

title = fig.text(x=0.5,y=0.97,ha='center',va='top',s='This is a title',color='w',backgroundcolor='blue')

bb = title.get_bbox_patch()

bb.set_width(w=100)

*更新*

进一步看另一篇文章,给出了一个潜在的解决方案,这确实有效!

title = fig.text(x=0.5,y=0.97,ha='center',va='top',s='This is a title',color='w',backgroundcolor='blue')

title._bbox_patch._mutation_aspect = 0.02

title.get_bbox_patch().set_boxstyle("square", pad=47.8)

请参阅下面的更新图片:

必须有一个更规定的蟒蛇方法来影响这个结果,但更具体的控制位置和背景颜色的大小!这就是我真正在寻找的解决方案!

谢谢!

1 回复 | 直到 6 年前

ImportanceOfBeingErnest 6 年前

您可以直接应用中提供的解决方案 How do I make the width of the title box span the entire plot? 只需稍作修改,就可以使用图形宽度而不是子图宽度作为子图的水平大小。

import matplotlib.pyplot as plt

from matplotlib.path import Path
from matplotlib.patches import BoxStyle


class ExtendedTextBox(BoxStyle._Base):
    """
    An Extended Text Box that expands to the axes limits 
                        if set in the middle of the axes
    """

    def __init__(self, pad=0.3, width=500.):
        """
        width: 
            width of the textbox. 
            Use `ax.get_window_extent().width` 
                   to get the width of the axes.
        pad: 
            amount of padding (in vertical direction only)
        """
        self.width=width
        self.pad = pad
        super(ExtendedTextBox, self).__init__()

    def transmute(self, x0, y0, width, height, mutation_size):
        """
        x0 and y0 are the lower left corner of original text box
        They are set automatically by matplotlib
        """
        # padding
        pad = mutation_size * self.pad

        # we add the padding only to the box height
        height = height + 2.*pad
        # boundary of the padded box
        y0 = y0 - pad
        y1 = y0 + height
        _x0 = x0
        x0 = _x0 +width /2. - self.width/2.
        x1 = _x0 +width /2. + self.width/2.

        cp = [(x0, y0),
              (x1, y0), (x1, y1), (x0, y1),
              (x0, y0)]

        com = [Path.MOVETO,
               Path.LINETO, Path.LINETO, Path.LINETO,
               Path.CLOSEPOLY]

        path = Path(cp, com)

        return path


# register the custom style
BoxStyle._style_list["ext"] = ExtendedTextBox

fig, ax = plt.subplots()
# set the title position to the horizontal center (0.5) of the axes
title = fig.suptitle('My Log Normal Example', position=(.5, 0.96), 
                     backgroundcolor='black', color='white')
# set the box style of the title text box to our custom box
bb = title.get_bbox_patch()


def resize(event):
    # use the figure width as width of the text box 
    bb.set_boxstyle("ext", pad=0.4, width=fig.get_size_inches()[0]*fig.dpi )

resize(None)
# Optionally: use eventhandler to resize the title box, in case the window is resized
cid = plt.gcf().canvas.mpl_connect('resize_event', resize)

# use the same dpi for saving to file as for plotting on screen
plt.savefig(__file__+".png", dpi="figure")
plt.show()