使用 pyqtgraph 实时绘制许多子图

Question

我使用了这个问题并试图用它来对许多子图进行快速实时绘图。

不幸的是，我很难理解代码，因此我在根据需要更改它时遇到了问题。

我想创建一个 10x10 像素的 2x2 矩阵的子图。 现在我得到以下信息：

代码如下所示：

from pyqtgraph.Qt import QtCore, QtGui
import pyqtgraph as pg
import numpy as np
import time
import sys

class App(QtGui.QMainWindow):
    def __init__(self, parent=None):
        super(App, self).__init__(parent)

        #### Create Gui Elements ###########
        self.mainbox = QtGui.QWidget()
        self.setCentralWidget(self.mainbox)
        self.mainbox.setLayout(QtGui.QVBoxLayout())

        self.canvas = pg.GraphicsLayoutWidget()
        self.mainbox.layout().addWidget(self.canvas)

        self.label = QtGui.QLabel()
        self.mainbox.layout().addWidget(self.label)

        self.view = self.canvas.addViewBox()
        self.view.setAspectLocked(True)
        self.view.setRange(QtCore.QRectF(0, 0, 50, 50))

        self.img = []
        for i in range(4): 
            self.img.append(pg.ImageItem(None, border="w"))
            self.canvas.nextRow()
            self.view.addItem(self.img[i])

        self._update()

    def _update(self):
        for i in range(4):
            self.data = np.random.rand(10,10)
            self.img[i].setImage(self.data)

        QtCore.QTimer.singleShot(1, self._update)

def sensor_data(n_sensors, x_res, y_res):
    return np.random.rand(n_sensors, x_res, y_res)

if __name__ == '__main__':
    while True:
        # Get sensor data
        data = sensor_data(4, 10, 10)
        # Pass data to live plot function?

    app = QtGui.QApplication(sys.argv)
    thisapp = App()
    thisapp.show()
    sys.exit(app.exec_())

有人可以告诉我我做错了什么吗？

Answer 1

您只构建了一个 ViewBox 并且在其中添加了项目并导致了问题，您必须做的是创建多个 ViewBox 并添加一个项目，如下所示：

from pyqtgraph.Qt import QtCore, QtGui
import pyqtgraph as pg
import numpy as np


class App(QtGui.QMainWindow):
    def __init__(self, parent=None):
        super(App, self).__init__(parent)
        self.mainbox = QtGui.QWidget()
        self.setCentralWidget(self.mainbox)

        self.canvas = pg.GraphicsLayoutWidget()
        self.label = QtGui.QLabel()

        lay = QtGui.QVBoxLayout(self.mainbox)
        lay.addWidget(self.canvas)
        lay.addWidget(self.label)

        self.img_items = []

        for i in range(4):
            view = self.canvas.addViewBox()
            view.setAspectLocked(True)
            view.setRange(QtCore.QRectF(0, 0, 10, 10))
            it = pg.ImageItem(None, border="w")
            view.addItem(it)
            self.img_items.append(it)
            self.canvas.nextRow()

        timer = QtCore.QTimer(self, interval=1)
        timer.timeout.connect(self._update)
        timer.start()

    def _update(self):
        for item in self.img_items:
            data = np.random.rand(10, 10)
            item.setImage(data)

if __name__ == '__main__':
    import sys
    app = QtGui.QApplication(sys.argv)
    thisapp = App()
    thisapp.show()
    sys.exit(app.exec_())

更新：

N×N

n = 2
for i in range(n):
    for j in range(n):
        view = self.canvas.addViewBox(i, j)
        view.setAspectLocked(True)
        view.setRange(QtCore.QRectF(0, 0, 10, 10))
        it = pg.ImageItem(None, border="w")
        view.addItem(it)
        self.img_items.append(it)

更新：

如果你想在一段时间内获取数据 True 你必须在一个新线程中进行以避免 GUI 被阻塞，你还必须给一个小的睡眠以便 GUI 可以更新：

from pyqtgraph.Qt import QtCore, QtGui
import pyqtgraph as pg
import numpy as np


def sensor_data(n_sensors, x_res, y_res):
    return np.random.rand(n_sensors, x_res, y_res)


class Thread(QtCore.QThread):
    dataChanged = QtCore.pyqtSignal(np.ndarray)
    def run(self):
        while True:
            data = sensor_data(4, 10, 10)
            self.dataChanged.emit(data)
            QtCore.QThread.msleep(10)


class App(QtGui.QMainWindow):
    def __init__(self, parent=None):
        super(App, self).__init__(parent)
        self.mainbox = QtGui.QWidget()
        self.setCentralWidget(self.mainbox)

        self.canvas = pg.GraphicsLayoutWidget()
        self.label = QtGui.QLabel()

        lay = QtGui.QVBoxLayout(self.mainbox)
        lay.addWidget(self.canvas)
        lay.addWidget(self.label)

        self.img_items = []
        n = 2

        for i in range(n):
            for j in range(n):
                view = self.canvas.addViewBox(i, j)
                view.setAspectLocked(True)
                view.setRange(QtCore.QRectF(0, 0, 10, 10))
                it = pg.ImageItem(None, border="w")
                view.addItem(it)
                self.img_items.append(it)

    @QtCore.pyqtSlot(np.ndarray)
    def update_data(self, data):
        for i, v in enumerate(data):
            self.img_items[i].setImage(v)


if __name__ == '__main__':
    import sys
    app = QtGui.QApplication(sys.argv)
    thisapp = App()
    thread = Thread()
    thread.dataChanged.connect(thisapp.update_data)
    thread.start()
    thisapp.show()
    sys.exit(app.exec_())