英文:
Pyqt application using matplotlib plots strange behavior when used in a different monitor
问题
我正在创建一个Pyqt应用程序，我希望在加载应用程序时绘制一个空图，然后每次按下按钮时绘制一些数据。
这是我的当前最小工作示例：
```python
import matplotlib.pyplot as plt
from random import random
from PyQt6 import QtWidgets
from matplotlib.backends.backend_qt5agg import FigureCanvasQTAgg
class Window(QtWidgets.QMainWindow):
def __init__(self, parent=None):
super().__init__(parent)
self.resize(1126, 568)
self.centralwidget = QtWidgets.QWidget()
self.gridLayout = QtWidgets.QGridLayout(self.centralwidget)
self.pushButtonConnect = QtWidgets.QPushButton("Connect")
self.gridLayout.addWidget(self.pushButtonConnect, 0, 0, 1, 1)
self.setCentralWidget(self.centralwidget)
self.fig, self.ax = plt.subplots()
self.canvas = FigureCanvasQTAgg(self.fig)
self.gridLayout.addWidget(self.canvas, 0, 1, 1, 1)
self.pushButtonConnect.clicked.connect(self.runGraph)
self.ax.set_xlim([0, 1])
self.ax.set_ylim([0, 1])
def runGraph(self):
canvas_new = FigureCanvasQTAgg(self.fig)
plt.plot([random(), random()], [random(), random()])
self.gridLayout.replaceWidget(self.canvas, canvas_new)
self.canvas = canvas_new
if __name__ == "__main__":
app = QtWidgets.QApplication([])
win = Window()
win.show()
app.exec()
这会创建一个应用程序，在点击按钮5次后，看起来是这样的。
然而，如果我在我的笔记本屏幕上打开相同的应用程序（而不是在我的外部显示器上），每次我点击按钮时，每条线都会变得更粗，5次后看起来像这样。
更甚者：如果我尝试调整主窗口的大小：
self.resize(1126, 568)
在我的显示器上在点击按钮5次后看起来正常，但在我的笔记本屏幕上看起来像这样，就好像在点击按钮时调整了网格。
我是做错了什么，还是matplotlib+Pyqt存在bug？
非常感谢您提前的帮助。
<details>
<summary>英文:</summary>
I'm creating a Pyqt application where i want to plot an empty figure when the application is loaded, and then plot some data every time a button is pressed.
Here is my current minumum working example:
```python
import matplotlib.pyplot as plt
from random import random
from PyQt6 import QtWidgets
from matplotlib.backends.backend_qt5agg import FigureCanvasQTAgg
class Window(QtWidgets.QMainWindow):
def __init__(self, parent=None):
super().__init__(parent)
self.resize(1126, 568)
self.centralwidget = QtWidgets.QWidget()
self.gridLayout = QtWidgets.QGridLayout(self.centralwidget)
self.pushButtonConnect = QtWidgets.QPushButton("Connect")
self.gridLayout.addWidget(self.pushButtonConnect, 0, 0, 1, 1)
self.setCentralWidget(self.centralwidget)
self.fig, self.ax = plt.subplots()
self.canvas = FigureCanvasQTAgg(self.fig)
self.gridLayout.addWidget(self.canvas, 0, 1, 1, 1)
self.pushButtonConnect.clicked.connect(self.runGraph)
self.ax.set_xlim([0, 1])
self.ax.set_ylim([0, 1])
def runGraph(self):
canvas_new = FigureCanvasQTAgg(self.fig)
plt.plot([random(), random()], [random(), random()])
self.gridLayout.replaceWidget(self.canvas, canvas_new)
self.canvas = canvas_new
if __name__ == "__main__":
app = QtWidgets.QApplication([])
win = Window()
win.show()
app.exec()
Which gives an application that, after 5 button clicks
looks like this.
However if a open the same application on my laptop screen (rather than in my external monitor), every time I click the button every line get bigger, and after 5 clicks
looks like this.
And even more: If I try to resize the main Window with:
self.resize(1126, 568)
on my monitor looks normal after 5 clicks, but on my laptop screen it looks like this, like it's resizing the grid if I click the button.
I'm doing something wrong or it's a bug of matplotlib+Pyqt?
Thank you very much in advance.
答案1
得分: 0
根据评论中relent95的建议，只需使用self.canvas.draw()就可以完成任务并解决问题。
所以现在函数如下：
def runGraph(self):
plt.plot([random(), random()], [random(), random()])
self.canvas.draw()
另一方面，我的笔记本电脑奇怪行为的谜团将保持未解之谜。
英文:
As relent95 suggested in the comment, simply using self.canvas.draw() does the job and fix the issue.
So now the function is:
def runGraph(self):
plt.plot([random(), random()], [random(), random()])
self.canvas.draw()
On the other hand, the mystery of my laptop strange behaviour will stay unsolved.
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