单击任何窗口小部件时

Question

我正在研究一个应用程序，在该应用程序中，我嵌入了一个vispy场景。Scenecanvas到Pyqt5以绘制量。但是，当我将PYQT5放在全屏上时，每当我单击任何小部件时，它都会闪烁。有什么方法可以解决此问题吗？

我添加了一个小脚本波纹管，它重现了同一问题。单击“负载音量”按钮或下拉列表，使屏幕闪烁过度。不确定是否在其他操作系统上发生这种情况，但是我正在使用Windows 10。

任何帮助都将不胜感激。谢谢

from PyQt5.QtWidgets import QComboBox, QVBoxLayout, QWidget, QHBoxLayout, QApplication, QFileDialog, QPushButton, QMainWindow
from vispy import scene
from vispy.visuals.transforms import STTransform, MatrixTransform
import numpy as np
import tifffile
import sys

import skimage
import skimage.exposure

class vispyTest(QMainWindow):

    def __init__(self):
        super(vispyTest, self).__init__()

        self.setVispyCanvas = scene.SceneCanvas()
        # self.setVispyCanvas.measure_fps()
        self.vispyView = self.setVispyCanvas.central_widget.add_view()

        # Create an XYZAxis visual
        self.axis = scene.visuals.XYZAxis(parent=self.vispyView)
        s = STTransform(translate=(50, 50), scale=(50, 50, 50, 1))
        affine = s.as_matrix()
        self.axis.transform = affine

        # Create cameras
        fov = 60.
        self.imageCamera = scene.cameras.TurntableCamera(
            parent=self.vispyView.scene, fov=fov, name='Turntable')
        self.vispyView.camera = self.imageCamera

        # Set initial view angle.
        self.vispyView.camera.azimuth = 90
        self.vispyView.camera.elevation = 30

        self.loadVolume = QPushButton()
        self.loadVolume.setText("LOAD VOLUME")
        self.loadVolume.clicked.connect(self.set_volume)

        self.closeWindow = QPushButton()
        self.closeWindow.setText("CLOSE")
        self.closeWindow.clicked.connect(self.close)

        colors = ["Yellow", "Magenta", "Black", "White",
                       "Green", "Blue", "Cyan", "Red"]
        self.drop_down = QComboBox()
        for color in colors:
            self.drop_down.addItem(color)

        self.buttonLayout = QVBoxLayout()
        self.buttonLayout.addWidget(self.loadVolume)
        self.buttonLayout.addWidget(self.drop_down)
        self.buttonLayout.addWidget(self.closeWindow)

        self.mainWidget = QWidget()
        self.mainLayout = QHBoxLayout(self.mainWidget)

        self.mainLayout.setSpacing(10)
        self.mainLayout.setContentsMargins(20, 20, 20, 20)
        self.mainLayout.addLayout(self.buttonLayout)
        self.mainLayout.addWidget(self.setVispyCanvas.native, 1)

        self.setCentralWidget(self.mainWidget)

        self.showFullScreen()

    def set_volume(self):

        openImageFile, _ = QFileDialog.getOpenFileName(
            self, "open", "", "Image Files (*.tif *.tiff *.TIF ""*.TIFF);;All Files (*)")

        if not openImageFile:
            return

        with tifffile.TiffFile(openImageFile) as tif:
            vol1 = tif.asarray()

        self.imageVolume = self.prepare_for_rendering(vol1)

        self.volume1 = scene.visuals.Volume(
            vol=self.imageVolume,
            parent=self.vispyView.scene,
            threshold=0.225,
            relative_step_size=2.0,
            method="mip")

        transformVolume = scene.STTransform(
            translate=(0, 0, 0))
        self.volume1.transform = transformVolume

        self.setVispyCanvas.update()

    def prepare_for_rendering(self, vol):
        """Convert the volume to uint8 and normalize intensity."""
        # Normalize intensity for float volumes between -1.0 and 1.0
        if (vol.dtype == np.float32 or vol.dtype == np.float64) and np.min(
                vol) < -1.0 or np.max(vol) > 1.0:
            vol = skimage.exposure.rescale_intensity(vol)
        if vol.dtype != np.uint8:
            vol = skimage.img_as_ubyte(vol)
        return vol

if __name__ == '__main__':
    # print(__doc__)
    app = QApplication(sys.argv)
    main_window = vispyTest()
    sys.exit(app.exec_())

Answer 1

这是您脚本的简化版本，不需要任何额外的依赖项并显示纯色卷：

from PyQt5.QtWidgets import QComboBox, QVBoxLayout, QWidget, QHBoxLayout, QApplication, QFileDialog, QPushButton, QMainWindow
from vispy import scene
from vispy.visuals.transforms import STTransform, MatrixTransform
import numpy as np
import sys


class vispyTest(QMainWindow):

    def __init__(self):
        super(vispyTest, self).__init__()

        self.setVispyCanvas = scene.SceneCanvas()
        # self.setVispyCanvas.measure_fps()
        self.vispyView = self.setVispyCanvas.central_widget.add_view()

        # Create an XYZAxis visual
        self.axis = scene.visuals.XYZAxis(parent=self.vispyView)
        s = STTransform(translate=(50, 50), scale=(50, 50, 50, 1))
        affine = s.as_matrix()
        self.axis.transform = affine

        # Create cameras
        fov = 60.
        self.imageCamera = scene.cameras.TurntableCamera(
            parent=self.vispyView.scene, fov=fov, name='Turntable')
        self.vispyView.camera = self.imageCamera

        # Set initial view angle.
        self.vispyView.camera.azimuth = 90
        self.vispyView.camera.elevation = 30

        self.loadVolume = QPushButton()
        self.loadVolume.setText("LOAD VOLUME")
        self.loadVolume.clicked.connect(self.set_volume)

        self.closeWindow = QPushButton()
        self.closeWindow.setText("CLOSE")
        self.closeWindow.clicked.connect(self.close)

        colors = ["Yellow", "Magenta", "Black", "White",
                       "Green", "Blue", "Cyan", "Red"]
        self.drop_down = QComboBox()
        for color in colors:
            self.drop_down.addItem(color)

        self.buttonLayout = QVBoxLayout()
        self.buttonLayout.addWidget(self.loadVolume)
        self.buttonLayout.addWidget(self.drop_down)
        self.buttonLayout.addWidget(self.closeWindow)

        self.mainWidget = QWidget()
        self.mainLayout = QHBoxLayout(self.mainWidget)

        self.mainLayout.setSpacing(10)
        self.mainLayout.setContentsMargins(20, 20, 20, 20)
        self.mainLayout.addLayout(self.buttonLayout)
        self.mainLayout.addWidget(self.setVispyCanvas.native, 1)

        self.setCentralWidget(self.mainWidget)

        self.showFullScreen()

    def set_volume(self):
        self.imageVolume = np.ones((100, 200, 300), dtype=np.uint8)
        self.volume1 = scene.visuals.Volume(
            vol=self.imageVolume,
            parent=self.vispyView.scene,
            threshold=0.225,
            relative_step_size=2.0,
            cmap="viridis",
            method="mip")

        transformVolume = scene.STTransform(translate=(0, 0, 0))
        self.volume1.transform = transformVolume
        self.setVispyCanvas.update()


if __name__ == '__main__':
    app = QApplication(sys.argv)
    main_window = vispyTest()
    sys.exit(app.exec_())

放大一段时间后，显示了：

我唯一在Popos上看到“闪烁”的时间（Linux）系统是我最初从起始位置放大的时候。此起始位置由您的相机和您在音量上的转换设置。缩小后，您仍然看到闪烁吗？您说“任何小部件”，这是否意味着QT下降？我无法再现。如果您使用self.show（）而不是self.self.showfullscreen（），您会看到闪烁吗？