使用Matplotlib从GUI中的单独线程保存图形

问题描述

我正在使用QRunnable类从gui启动单独的线程（用于非阻塞功能）。该线程正在使用Matplotlib将某些图另存为pdf。但是它给出了一些警告

    class Results(QRunnable):
        def __init__(self):
        super(Results,self).__init__()


        def run(self):
            plt.plot([1,2,3,4],[1,4])
            plt.savefig('plot.pdf')

    class MainWindow(QMainWindow):


        def __init__(self,*args,**kwargs):
            super(MainWindow,self).__init__(*args,**kwargs)
            self.threadpool = QThreadPool()
            

            layout = QVBoxLayout()
    
            self.l = QLabel("Start")
            b = QPushButton("DANGER!")
            b.pressed.connect(self.oh_no)

            layout.addWidget(self.l)
            layout.addWidget(b)

            w = QWidget()
            w.setLayout(layout)

            self.setCentralWidget(w)

            self.show()

        def oh_no(self):
            worker = Results()
            self.threadpool.start(worker)


    app = QApplication([])
    window = MainWindow()
    app.exec_()

这些是警告：

 QPixmap: It is not safe to use pixmaps outside the GUI thread
 QPainter::begin: Paint device returned engine == 0,type: 2
 QPainter::setRenderHint: Painter must be active to set rendering hints
 QPainter::setBrush: Painter not active
 QPainter::translate: Painter not active
 QPainter::translate: Painter not active
 QPainter::setBrush: Painter not active
 QPainter::setPen: Painter not active
 QPainter::translate: Painter not active
 QPainter::setBrush: Painter not active
 QPainter::setPen: Painter not active
 QPixmap: It is not safe to use pixmaps outside the GUI thread
 QObject: Cannot create children for a parent that is in a different thread.
 (Parent is Oxygen::WidgetStateEngine(0x282cdc0),parent's thread is QThread(0x141baf0),current thread is QThread(0x2a87e60)

解决方法

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