如何更改交互式缩放矩形的颜色? [英] How to change the color of the interactive zoom rectangle?
问题描述
我有一个简单的交互式情节.当我单击放大镜按钮时,我可以绘制一个矩形以进行交互式缩放.您可以在下图中看到虚线矩形.
I have a simple interactive plot. When I click on the magnifying glass button I can draw a rectangle to do interactive zooming. You can see the dotted rectangle in the image below.
但是,当我在深色背景上使用白色网格时(使用 plt.style.use('dark_background')
),缩放矩形几乎不可见.它仍然存在,但在一个主要是黑色的情节上是黑色的.
However, when I use white grid on a dark background (with plt.style.use('dark_background')
), the zoom rectangle is barely visible. It is still there but black on a largely black plot.
为了完整起见,使用 Matplotlib 3.1.3 生成的图如下:
For completeness, the plots where generated with Matplotlib 3.1.3 as follows:
import matplotlib.pyplot as plt
import numpy as np
plt.style.use('dark_background')
fig = plt.figure()
ax = fig.add_subplot(111)
data = 2.5 * np.random.randn(400) + 3
ax.plot(data)
plt.show()
所以我的问题是:如何更改缩放矩形的颜色?
So my question therefore is: how can I change the color of the zoom rectangle?
推荐答案
这取决于您使用的后端,没有(至少我不知道)通用解决方案.如评论中所述,这只能通过修补猴子来实现.这是我使用 Qt5 后端的尝试.请注意,您也需要安装PyQt5才能使此工作正常进行.
It depends on what backend you're using there is no (at least I don't know a) universal solution. As stated in the comments this can be achieved only with monkey-patching. Here is my attempt using Qt5 backend. Note that you need to have PyQt5 installed too in order to make this work.
from PyQt5 import QtGui, QtCore
from matplotlib.backends.backend_qt5 import FigureCanvasQT
# extending the original FigureCanvasQT class
class NewFigureCanvasQT(FigureCanvasQT):
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
def drawRectangle(self, rect):
# Draw the zoom rectangle to the QPainter. _draw_rect_callback needs
# to be called at the end of paintEvent.
if rect is not None:
def _draw_rect_callback(painter):
pen = QtGui.QPen(QtCore.Qt.red, 1 / self._dpi_ratio, # <-- change the color here
QtCore.Qt.DotLine)
painter.setPen(pen)
painter.drawRect(*(pt / self._dpi_ratio for pt in rect))
else:
def _draw_rect_callback(painter):
return
self._draw_rect_callback = _draw_rect_callback
self.update()
# do the imports and replace the old FigureCanvasQT
import matplotlib
import matplotlib.pyplot as plt
matplotlib.backends.backend_qt5.FigureCanvasQT = NewFigureCanvasQT
# switch backend and setup the dark background
matplotlib.use('Qt5Agg')
matplotlib.style.use('dark_background')
# do the plotting
plt.plot(range(9))
plt.show()
将产生以下图片:
编辑:这似乎在版本3.3.1中已修复.查看发行说明.
EDIT: This seem to be fixed in release 3.3.1. See the release notes.
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