Python 如何使动画在PyQt5 Qt3D中正常工作？

我试图从中的示例理解PyQt5中的动画操作

我已经将代码翻译成Python，并且能够运行它，但是没有动画。我想我需要将信号连接到某个地方的Update（）方法，但我让troubel知道如何做到这一点

以下是PyQt5（python 3）代码：

如有任何建议，将不胜感激。 以下是（未激活）结果的屏幕截图

您必须：

完整代码：

from PyQt5.Qt3DCore import QEntity, QTransform
from PyQt5.Qt3DExtras import QTorusMesh, QPhongMaterial, \
    QSphereMesh, Qt3DWindow, QOrbitCameraController

from PyQt5.QtWidgets import QApplication
from PyQt5.QtGui import QVector3D, QQuaternion, QMatrix4x4
from PyQt5.QtCore import pyqtSlot, pyqtSignal, QPropertyAnimation, pyqtProperty

import sys


def fuzzyCompareDouble(p1, p2):
    """
    compares 2 double as points
    """
    return abs(p1 - p2) * 100000. <= min(abs(p1), abs(p2))

class OrbitTransformController(QTransform):
    targetChanged = pyqtSignal()
    angleChanged = pyqtSignal()
    radiusChanged = pyqtSignal()

    def __init__(self, parent):
        super().__init__(parent)
        self.m_target = QTransform()
        self.m_matrix = QMatrix4x4()
        self.m_radius = 1.0
        self.m_angle = 0.0

    def target(self):
        return self.m_target

    def setTarget(self, target):
        if self.m_target == target:
            return
        self.m_target = target
        self.targetChanged.emit()


    def setRadius(self, radius):
        if fuzzyCompareDouble(radius, self.m_radius):
            return
        self.m_radius = radius
        self.radiusChanged.emit()

    def radius(self, ): #  : # method of "", returning float OrbitTransformController (const)
        return self.m_radius

    def setAngle(self, angle): #  : # method of "", returning void OrbitTransformController ()
        if fuzzyCompareDouble(angle, self.m_angle):
            return
        self.m_angle = angle
        self.updateMatrix()
        self.angleChanged.emit()

    def angle(self): #  : # method of "", returning float OrbitTransformController (const)
        return self.m_angle

    def updateMatrix(self, ): #  : # method of "", returning void OrbitTransformController ()
        self.m_matrix.setToIdentity()
        self.m_matrix.rotate(self.m_angle, QVector3D(0.0, 1.0, 0.0))
        self.m_matrix.translate(self.m_radius, 0.0, 0.0)
        self.m_target.setMatrix(self.m_matrix)

    angle = pyqtProperty(float, fget=angle, fset=setAngle, notify=angleChanged)
    radius = pyqtProperty(float, fget=radius, fset=setRadius, notify=radiusChanged)
    target = pyqtProperty(float, fget=target, fset=setTarget, notify=angleChanged)

def createScene():
    # Root entity
    rootEntity = QEntity()

    # Material
    material = QPhongMaterial(rootEntity)

    # Torus
    torusEntity = QEntity(rootEntity)
    # Qt3DExtras.QTorusMesh *
    torusMesh = QTorusMesh()
    torusMesh.setRadius(5)
    torusMesh.setMinorRadius(1)
    torusMesh.setRings(100)
    torusMesh.setSlices(20)

    #Qt3DCore.QTransform *
    torusTransform = QTransform()
    torusTransform.setScale3D(QVector3D(1.5, 1, 0.5))
    torusTransform.setRotation(QQuaternion.fromAxisAndAngle(QVector3D(1, 0, 0), 45.0))

    torusEntity.addComponent(torusMesh)
    torusEntity.addComponent(torusTransform)
    torusEntity.addComponent(material)

    # Sphere
    sphereEntity = QEntity(rootEntity)
    sphereMesh = QSphereMesh()
    sphereMesh.setRadius(3)

    # Qt3DCore.QTransform *
    sphereTransform = QTransform()
    #OrbitTransformController *
    controller = OrbitTransformController(sphereTransform)
    controller.setTarget(sphereTransform)
    controller.setRadius(20.0)
    # QPropertyAnimation *
    sphereRotateTransformAnimation = QPropertyAnimation(sphereTransform)
    sphereRotateTransformAnimation.setTargetObject(controller)
    sphereRotateTransformAnimation.setPropertyName(b"angle")
    sphereRotateTransformAnimation.setStartValue(0)
    sphereRotateTransformAnimation.setEndValue(360)
    sphereRotateTransformAnimation.setDuration(10000)
    sphereRotateTransformAnimation.setLoopCount(-1)
    sphereRotateTransformAnimation.start()

    sphereEntity.addComponent(sphereMesh)
    sphereEntity.addComponent(sphereTransform)
    sphereEntity.addComponent(material)

    return rootEntity


if __name__ == "__main__":
    app = QApplication(sys.argv)
    view = Qt3DWindow()
    scene = createScene()

    # Camera
    camera = view.camera()
    camera.lens().setPerspectiveProjection(45.0, 16.0/9.0, 0.1, 1000.0)
    camera.setPosition(QVector3D(0, 0, 40.0))
    camera.setViewCenter(QVector3D(0, 0, 0))

    # For camera controls
    camController = QOrbitCameraController(scene)
    camController.setLinearSpeed( 50.0 )
    camController.setLookSpeed( 180.0 )
    camController.setCamera(camera)

    view.setRootEntity(scene)
    view.show()

    sys.exit(app.exec())

来自PyQt5.Qt3DCore导入QEntity，QTransform
从PyQt5.Qt3DExtras导入QTorusMesh、QPhongMaterial、\
QSphereMesh、Qt3DWindow、QOrbitCameraController
从PyQt5.QtWidgets导入QApplication
从PyQt5.QtGui导入QVector3D、q四元数、QMatrix4x4
从PyQt5.QtCore导入pyqtSlot、pyqtSignal、QPropertyAnimation、pyqtProperty
导入系统
def fuzzyCompareDouble（p1、p2）：
"""
比较2个双as点
"""
返回abs（p1-p2）*100000。
Q_OBJECT
Q_PROPERTY(Qt3DCore::QTransform* target READ target WRITE setTarget NOTIFY targetChanged)
Q_PROPERTY(float radius READ radius WRITE setRadius NOTIFY radiusChanged)
Q_PROPERTY(float angle READ angle WRITE setAngle NOTIFY angleChanged)

angle = pyqtProperty(float, fget=angle, fset=setAngle, notify=angleChanged)
radius = pyqtProperty(float, fget=radius, fset=setRadius, notify=radiusChanged)
target = pyqtProperty(QTransform, fget=target, fset=setTarget, notify=targetChanged)

from PyQt5.Qt3DCore import QEntity, QTransform
from PyQt5.Qt3DExtras import QTorusMesh, QPhongMaterial, \
    QSphereMesh, Qt3DWindow, QOrbitCameraController

from PyQt5.QtWidgets import QApplication
from PyQt5.QtGui import QVector3D, QQuaternion, QMatrix4x4
from PyQt5.QtCore import pyqtSlot, pyqtSignal, QPropertyAnimation, pyqtProperty

import sys


def fuzzyCompareDouble(p1, p2):
    """
    compares 2 double as points
    """
    return abs(p1 - p2) * 100000. <= min(abs(p1), abs(p2))

class OrbitTransformController(QTransform):
    targetChanged = pyqtSignal()
    angleChanged = pyqtSignal()
    radiusChanged = pyqtSignal()

    def __init__(self, parent):
        super().__init__(parent)
        self.m_target = QTransform()
        self.m_matrix = QMatrix4x4()
        self.m_radius = 1.0
        self.m_angle = 0.0

    def target(self):
        return self.m_target

    def setTarget(self, target):
        if self.m_target == target:
            return
        self.m_target = target
        self.targetChanged.emit()


    def setRadius(self, radius):
        if fuzzyCompareDouble(radius, self.m_radius):
            return
        self.m_radius = radius
        self.radiusChanged.emit()

    def radius(self, ): #  : # method of "", returning float OrbitTransformController (const)
        return self.m_radius

    def setAngle(self, angle): #  : # method of "", returning void OrbitTransformController ()
        if fuzzyCompareDouble(angle, self.m_angle):
            return
        self.m_angle = angle
        self.updateMatrix()
        self.angleChanged.emit()

    def angle(self): #  : # method of "", returning float OrbitTransformController (const)
        return self.m_angle

    def updateMatrix(self, ): #  : # method of "", returning void OrbitTransformController ()
        self.m_matrix.setToIdentity()
        self.m_matrix.rotate(self.m_angle, QVector3D(0.0, 1.0, 0.0))
        self.m_matrix.translate(self.m_radius, 0.0, 0.0)
        self.m_target.setMatrix(self.m_matrix)

    angle = pyqtProperty(float, fget=angle, fset=setAngle, notify=angleChanged)
    radius = pyqtProperty(float, fget=radius, fset=setRadius, notify=radiusChanged)
    target = pyqtProperty(float, fget=target, fset=setTarget, notify=angleChanged)

def createScene():
    # Root entity
    rootEntity = QEntity()

    # Material
    material = QPhongMaterial(rootEntity)

    # Torus
    torusEntity = QEntity(rootEntity)
    # Qt3DExtras.QTorusMesh *
    torusMesh = QTorusMesh()
    torusMesh.setRadius(5)
    torusMesh.setMinorRadius(1)
    torusMesh.setRings(100)
    torusMesh.setSlices(20)

    #Qt3DCore.QTransform *
    torusTransform = QTransform()
    torusTransform.setScale3D(QVector3D(1.5, 1, 0.5))
    torusTransform.setRotation(QQuaternion.fromAxisAndAngle(QVector3D(1, 0, 0), 45.0))

    torusEntity.addComponent(torusMesh)
    torusEntity.addComponent(torusTransform)
    torusEntity.addComponent(material)

    # Sphere
    sphereEntity = QEntity(rootEntity)
    sphereMesh = QSphereMesh()
    sphereMesh.setRadius(3)

    # Qt3DCore.QTransform *
    sphereTransform = QTransform()
    #OrbitTransformController *
    controller = OrbitTransformController(sphereTransform)
    controller.setTarget(sphereTransform)
    controller.setRadius(20.0)
    # QPropertyAnimation *
    sphereRotateTransformAnimation = QPropertyAnimation(sphereTransform)
    sphereRotateTransformAnimation.setTargetObject(controller)
    sphereRotateTransformAnimation.setPropertyName(b"angle")
    sphereRotateTransformAnimation.setStartValue(0)
    sphereRotateTransformAnimation.setEndValue(360)
    sphereRotateTransformAnimation.setDuration(10000)
    sphereRotateTransformAnimation.setLoopCount(-1)
    sphereRotateTransformAnimation.start()

    sphereEntity.addComponent(sphereMesh)
    sphereEntity.addComponent(sphereTransform)
    sphereEntity.addComponent(material)

    return rootEntity


if __name__ == "__main__":
    app = QApplication(sys.argv)
    view = Qt3DWindow()
    scene = createScene()

    # Camera
    camera = view.camera()
    camera.lens().setPerspectiveProjection(45.0, 16.0/9.0, 0.1, 1000.0)
    camera.setPosition(QVector3D(0, 0, 40.0))
    camera.setViewCenter(QVector3D(0, 0, 0))

    # For camera controls
    camController = QOrbitCameraController(scene)
    camController.setLinearSpeed( 50.0 )
    camController.setLookSpeed( 180.0 )
    camController.setCamera(camera)

    view.setRootEntity(scene)
    view.show()

    sys.exit(app.exec())