cylinderwindow.py

#!/usr/bin/env python

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"""PySide2 port of the qt3d/simple-cpp example from Qt v5.x"""

import sys
from PySide2.QtCore import Property, QObject, QPropertyAnimation, Signal, Slot
from PySide2.QtGui import QGuiApplication, QMatrix4x4, QQuaternion, QVector3D, QWindow
from PySide2.Qt3DCore import Qt3DCore
from PySide2.Qt3DRender import Qt3DRender
from PySide2.Qt3DExtras import Qt3DExtras


class OrbitTransformController(QObject):
    def __init__(self, parent):
        super(OrbitTransformController, self).__init__(parent)
        self._target = None
        self._matrix = QMatrix4x4()
        self._radius = 1
        self._angle = 0

    def setTarget(self, t):
        self._target = t

    def getTarget(self):
        return self._target

    def setRadius(self, radius):
        if self._radius != radius:
            self._radius = radius
            self.updateMatrix()
            self.radiusChanged.emit()

    def getRadius(self):
        return self._radius

    def setAngle(self, angle):
        if self._angle != angle:
            self._angle = angle
            self.updateMatrix()
            self.angleChanged.emit()

    def getAngle(self):
        return self._angle

    def updateMatrix(self):
        self._matrix.setToIdentity()
        self._matrix.rotate(self._angle, QVector3D(0, 1, 0))
        self._matrix.translate(self._radius, 0, 0)
        if self._target is not None:
            self._target.setMatrix(self._matrix)

    angleChanged = Signal()
    radiusChanged = Signal()
    angle = Property(float, getAngle, setAngle, notify=angleChanged)
    radius = Property(float, getRadius, setRadius, notify=radiusChanged)


class CylinderWindow(Qt3DExtras.Qt3DWindow):
    def __init__(self):
        super(CylinderWindow, self).__init__()

        # Camera
        self.camera().lens().setPerspectiveProjection(45, 16 / 9, 0.1, 1000)
        self.camera().setPosition(QVector3D(0, 0, 40))
        self.camera().setViewCenter(QVector3D(0, 0, 0))

        # For camera controls
        self.createScene()
        self.camController = Qt3DExtras.QOrbitCameraController(self.rootEntity)
        self.camController.setLinearSpeed(50)
        self.camController.setLookSpeed(180)
        self.camController.setCamera(self.camera())

        self.setRootEntity(self.rootEntity)

    def createScene(self):
        # Root entity
        self.rootEntity = Qt3DCore.QEntity()

        # Material
        self.material = Qt3DExtras.QPhongMaterial(self.rootEntity)

        # Torus
        self.torusEntity = Qt3DCore.QEntity(self.rootEntity)
        self.torusMesh = Qt3DExtras.QTorusMesh()
        self.torusMesh.setRadius(5)
        self.torusMesh.setMinorRadius(1)
        self.torusMesh.setRings(100)
        self.torusMesh.setSlices(20)

        self.torusTransform = Qt3DCore.QTransform()
        self.torusTransform.setScale3D(QVector3D(1.5, 1, 0.5))
        self.torusTransform.setRotation(
            QQuaternion.fromAxisAndAngle(QVector3D(1, 0, 0), 45)
        )

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

        # Sphere
        self.sphereEntity = Qt3DCore.QEntity(self.rootEntity)
        self.sphereMesh = Qt3DExtras.QSphereMesh()
        self.sphereMesh.setRadius(3)

        self.sphereTransform = Qt3DCore.QTransform()
        self.controller = OrbitTransformController(self.sphereTransform)
        self.controller.setTarget(self.sphereTransform)
        self.controller.setRadius(20)

        self.sphereRotateTransformAnimation = QPropertyAnimation(self.sphereTransform)
        self.sphereRotateTransformAnimation.setTargetObject(self.controller)
        self.sphereRotateTransformAnimation.setPropertyName(b"angle")
        self.sphereRotateTransformAnimation.setStartValue(0)
        self.sphereRotateTransformAnimation.setEndValue(360)
        self.sphereRotateTransformAnimation.setDuration(10000)
        self.sphereRotateTransformAnimation.setLoopCount(-1)
        self.sphereRotateTransformAnimation.start()

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