python - 如何在单个 PyQt GUI 实例中多处理多个绘图

问题描述

我有一个名为CrosshairPlotWidget. 每个绘图对象都会产生一个更新其数据的线程，但这些线程仍在同一个主 GUI 进程中。这是我目前拥有的和插图：

1 个主 GUI 进程，2 个线程

我想在一个单独的进程中运行这两个图，但都在同一个 GUI 实例（同一个窗口）中。本质上，我试图将每个情节放入自己单独的子进程中以实现真正的并发，因为我的 CPU 瓶颈。通过将每个更新线程放在一个单独的进程中，它将绕过 Python 的全局解释器锁。这是预期目标的图示：

1 个主 GUI 进程和 2 个子进程，每个子进程都有自己的线程

我看过

但对我的情况没有任何帮助。

我还发现它可以进行多处理但不在同一个 GUI 窗口中。

from PyQt4 import QtCore, QtGui
import multiprocessing as mp
from threading import Thread
import pyqtgraph as pg
import numpy as np
import sys
import random
import time

class CrosshairPlotWidget(QtGui.QWidget):
    """Scrolling plot with crosshair"""

    def __init__(self, parent=None):
        super(CrosshairPlotWidget, self).__init__(parent)

        # Use for time.sleep (s)
        self.FREQUENCY = .025
        # Use for timer.timer (ms)
        self.TIMER_FREQUENCY = self.FREQUENCY * 1000

        self.LEFT_X = -10
        self.RIGHT_X = 0
        self.x_axis = np.arange(self.LEFT_X, self.RIGHT_X, self.FREQUENCY)
        self.buffer = int((abs(self.LEFT_X) + abs(self.RIGHT_X))/self.FREQUENCY)
        self.data = []

        self.crosshair_plot_widget = pg.PlotWidget()
        self.crosshair_plot_widget.setXRange(self.LEFT_X, self.RIGHT_X)
        self.crosshair_plot_widget.setLabel('left', 'Value')
        self.crosshair_plot_widget.setLabel('bottom', 'Time (s)')
        self.crosshair_color = (101,255,183)

        self.crosshair_plot = self.crosshair_plot_widget.plot()

        self.layout = QtGui.QGridLayout()
        self.layout.addWidget(self.crosshair_plot_widget)

        self.crosshair_plot_widget.plotItem.setAutoVisible(y=True)
        self.vertical_line = pg.InfiniteLine(angle=90)
        self.horizontal_line = pg.InfiniteLine(angle=0, movable=False)
        self.vertical_line.setPen(self.crosshair_color)
        self.horizontal_line.setPen(self.crosshair_color)
        self.crosshair_plot_widget.setAutoVisible(y=True)
        self.crosshair_plot_widget.addItem(self.vertical_line, ignoreBounds=True)
        self.crosshair_plot_widget.addItem(self.horizontal_line, ignoreBounds=True)

        self.crosshair_update = pg.SignalProxy(self.crosshair_plot_widget.scene().sigMouseMoved, rateLimit=60, slot=self.update_crosshair)

        self.update_data_thread = Thread(target=self.plot_updater, args=())
        self.update_data_thread.daemon = True
        self.update_data_thread.start()

    def plot_updater(self):
        """Updates data buffer with data value"""

        while True:
            self.data_point = random.randint(1,101)
            if len(self.data) >= self.buffer:
                del self.data[:1]
            self.data.append(float(self.data_point))
            self.crosshair_plot.setData(self.x_axis[len(self.x_axis) - len(self.data):], self.data)
            time.sleep(self.FREQUENCY)

    def update_crosshair(self, event):
        """Paint crosshair on mouse"""

        coordinates = event[0]  
        if self.crosshair_plot_widget.sceneBoundingRect().contains(coordinates):
            mouse_point = self.crosshair_plot_widget.plotItem.vb.mapSceneToView(coordinates)
            index = mouse_point.x()
            if index > self.LEFT_X and index <= self.RIGHT_X:
                self.crosshair_plot_widget.setTitle("<span style='font-size: 12pt'>x=%0.1f,   <span style='color: red'>y=%0.1f</span>" % (mouse_point.x(), mouse_point.y()))
            self.vertical_line.setPos(mouse_point.x())
            self.horizontal_line.setPos(mouse_point.y())

    def get_crosshair_plot_layout(self):
        return self.layout

if __name__ == '__main__':
    # Create main application window
    app = QtGui.QApplication([])
    app.setStyleSheet("""
        QWidget {
            background-color: #19232D;
            border: 0px solid #32414B;
            padding: 0px;
            color: #F0F0F0;
            selection-background-color: #1464A0;
            selection-color: #F0F0F0;
        }""")
    app.setStyle(QtGui.QStyleFactory.create("Cleanlooks"))
    mw = QtGui.QMainWindow()
    mw.setWindowTitle('Crosshair Plot')

    # Create and set widget layout
    # Main widget container
    cw = QtGui.QWidget()
    ml = QtGui.QGridLayout()
    cw.setLayout(ml)
    mw.setCentralWidget(cw)

    # Create crosshair plot
    crosshair_plot1 = CrosshairPlotWidget()
    crosshair_plot2 = CrosshairPlotWidget()

    ml.addLayout(crosshair_plot1.get_crosshair_plot_layout(),0,0,1,1)
    ml.addLayout(crosshair_plot2.get_crosshair_plot_layout(),0,1,1,1)
    mw.show()

    ## Start Qt event loop unless running in interactive mode or using pyside.
    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
        QtGui.QApplication.instance().exec_()

标签： pythonmultithreadingpyqtmultiprocessingpyqtgraph

python - 如何在单个 PyQt GUI 实例中多处理多个绘图

问题描述

解决方案

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