# Copyright (C) 2016 Riverbank Computing Limited
# Copyright (C) 2014 Klaralvdalens Datakonsult AB (KDAB).
#
# Commercial License Usage
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# accordance with the commercial license agreement provided with the
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# BSD License Usage
# Alternatively, you may use this file under the terms of the BSD license
# as follows:
#
# "Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#   * Redistributions of source code must retain the above copyright
#     notice, this list of conditions and the following disclaimer.
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#     notice, this list of conditions and the following disclaimer in
#     the documentation and/or other materials provided with the
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import sys

from PyQt5.QtCore import (pyqtProperty, pyqtSignal, qFuzzyCompare, QObject,
        QPropertyAnimation)
from PyQt5.QtGui import QGuiApplication, QMatrix4x4, QQuaternion, QVector3D
from PyQt5.Qt3DCore import QEntity, QTransform
from PyQt5.Qt3DRender import QCamera
from PyQt5.Qt3DExtras import (Qt3DWindow, QOrbitCameraController,
        QPhongMaterial, QSphereMesh, QTorusMesh)


class OrbitTransformController(QObject):

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

        self.m_target = None
        self.m_matrix = QMatrix4x4()
        self.m_radius = 1.0
        self.m_angle = 0.0

    targetChanged = pyqtSignal()

    @pyqtProperty(QTransform, notify=targetChanged)
    def target(self):
        return self.m_target

    @target.setter
    def target(self, target):
        if self.m_target is not target:
            self.m_target = target
            self.targetChanged.emit()

    radiusChanged = pyqtSignal()

    @pyqtProperty(float, notify=radiusChanged)
    def radius(self):
        return self.m_radius

    @radius.setter
    def radius(self, radius):
        if not qFuzzyCompare(self.m_radius, radius):
            self.m_radius = radius
            self.updateMatrix()
            self.radiusChanged.emit()

    angleChanged = pyqtSignal()

    @pyqtProperty(float, notify=angleChanged)
    def angle(self):
        return self.m_angle

    @angle.setter
    def angle(self, angle):
        if not qFuzzyCompare(self.m_angle, angle):
            self.m_angle = angle
            self.updateMatrix()
            self.angleChanged.emit()

    def updateMatrix(self):
        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)


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

    # Material.
    material = QPhongMaterial(rootEntity)

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

    torusTransform = QTransform()
    torusTransform.setScale3D(QVector3D(1.5, 1.0, 0.5))
    torusTransform.setRotation(
            QQuaternion.fromAxisAndAngle(QVector3D(1.0, 0.0, 0.0), 45.0))

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

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

    sphereTransform = QTransform()
    controller = OrbitTransformController(sphereTransform)
    controller.target = sphereTransform
    controller.radius = 20.0

    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


app = QGuiApplication(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, 0.0, 40.0))
camera.setViewCenter(QVector3D(0.0, 0.0, 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_())