qt-everywhere-src-5.14.1/qtbase/examples/widgets/graphicsview/boxes/qtbox.cpp - orbit - Git at Google

 /****************************************************************************
 **
 ** Copyright (C) 2016 The Qt Company Ltd.
 ** Contact: https://www.qt.io/licensing/
 **
 ** This file is part of the demonstration applications of the Qt Toolkit.
 **
 ** $QT_BEGIN_LICENSE:BSD$
 ** Commercial License Usage
 ** Licensees holding valid commercial Qt licenses may use this file in
 ** accordance with the commercial license agreement provided with the
 ** Software or, alternatively, in accordance with the terms contained in
 ** a written agreement between you and The Qt Company. For licensing terms
 ** and conditions see https://www.qt.io/terms-conditions. For further
 ** information use the contact form at https://www.qt.io/contact-us.
 **
 ** 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.
 **   * Redistributions in binary form must reproduce the above copyright
 **     notice, this list of conditions and the following disclaimer in
 **     the documentation and/or other materials provided with the
 **     distribution.
 **   * Neither the name of The Qt Company Ltd nor the names of its
 **     contributors may be used to endorse or promote products derived
 **     from this software without specific prior written permission.
 **
 **
 ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
 **
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/

 #include "qtbox.h"

 constexpr qreal ROTATE_SPEED_X = 30.0 / 1000.0;
 constexpr qreal ROTATE_SPEED_Y = 20.0 / 1000.0;
 constexpr qreal ROTATE_SPEED_Z = 40.0 / 1000.0;
 constexpr int MAX_ITEM_SIZE = 512;
 constexpr int MIN_ITEM_SIZE = 16;

 //============================================================================//
 //                                  ItemBase                                  //
 //============================================================================//

 ItemBase::ItemBase(int size, int x, int y) : m_size(size), m_startTime(QTime::currentTime())
 {
     setFlag(QGraphicsItem::ItemIsMovable, true);
     setFlag(QGraphicsItem::ItemIsSelectable, true);
     setFlag(QGraphicsItem::ItemIsFocusable, true);
     setAcceptHoverEvents(true);
     setPos(x, y);
 }

 QRectF ItemBase::boundingRect() const
 {
     return QRectF(-m_size / 2, -m_size / 2, m_size, m_size);
 }

 void ItemBase::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *)
 {
     if (option->state & QStyle::State_Selected) {
         painter->setRenderHint(QPainter::Antialiasing, true);
         if (option->state & QStyle::State_HasFocus)
             painter->setPen(Qt::yellow);
         else
             painter->setPen(Qt::white);
         painter->drawRect(boundingRect());

         painter->drawLine(m_size / 2 - 9, m_size / 2, m_size / 2, m_size / 2 - 9);
         painter->drawLine(m_size / 2 - 6, m_size / 2, m_size / 2, m_size / 2 - 6);
         painter->drawLine(m_size / 2 - 3, m_size / 2, m_size / 2, m_size / 2 - 3);

         painter->setRenderHint(QPainter::Antialiasing, false);
     }
 }

 void ItemBase::contextMenuEvent(QGraphicsSceneContextMenuEvent *event)
 {
     if (!isSelected() && scene()) {
         scene()->clearSelection();
         setSelected(true);
     }

     QMenu menu;
     QAction *delAction = menu.addAction("Delete");
     QAction *newAction = menu.addAction("New");
     QAction *growAction = menu.addAction("Grow");
     QAction *shrinkAction = menu.addAction("Shrink");

     QAction *selectedAction = menu.exec(event->screenPos());

     if (selectedAction == delAction)
         deleteSelectedItems(scene());
     else if (selectedAction == newAction)
         duplicateSelectedItems(scene());
     else if (selectedAction == growAction)
         growSelectedItems(scene());
     else if (selectedAction == shrinkAction)
         shrinkSelectedItems(scene());
 }

 void ItemBase::duplicateSelectedItems(QGraphicsScene *scene)
 {
     if (!scene)
         return;

     const QList<QGraphicsItem *> selected = scene->selectedItems();
     for (QGraphicsItem *item : selected) {
         ItemBase *itemBase = qgraphicsitem_cast<ItemBase *>(item);
         if (itemBase)
             scene->addItem(itemBase->createNew(itemBase->m_size, itemBase->pos().x() + itemBase->m_size, itemBase->pos().y()));
     }
 }

 void ItemBase::deleteSelectedItems(QGraphicsScene *scene)
 {
     if (!scene)
         return;

     const QList<QGraphicsItem *> selected = scene->selectedItems();
     for (QGraphicsItem *item : selected) {
         ItemBase *itemBase = qgraphicsitem_cast<ItemBase *>(item);
         if (itemBase)
             delete itemBase;
     }
 }

 void ItemBase::growSelectedItems(QGraphicsScene *scene)
 {
     if (!scene)
         return;

     const QList<QGraphicsItem *> selected = scene->selectedItems();
     for (QGraphicsItem *item : selected) {
         ItemBase *itemBase = qgraphicsitem_cast<ItemBase *>(item);
         if (itemBase) {
             itemBase->prepareGeometryChange();
             itemBase->m_size *= 2;
             if (itemBase->m_size > MAX_ITEM_SIZE)
                 itemBase->m_size = MAX_ITEM_SIZE;
         }
     }
 }

 void ItemBase::shrinkSelectedItems(QGraphicsScene *scene)
 {
     if (!scene)
         return;

     const QList<QGraphicsItem *> selected = scene->selectedItems();
     for (QGraphicsItem *item : selected) {
         ItemBase *itemBase = qgraphicsitem_cast<ItemBase *>(item);
         if (itemBase) {
             itemBase->prepareGeometryChange();
             itemBase->m_size /= 2;
             if (itemBase->m_size < MIN_ITEM_SIZE)
                 itemBase->m_size = MIN_ITEM_SIZE;
         }
     }
 }

 void ItemBase::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
 {
     if (m_isResizing) {
         int dx = int(2.0 * event->pos().x());
         int dy = int(2.0 * event->pos().y());
         prepareGeometryChange();
         m_size = (dx > dy ? dx : dy);
         if (m_size < MIN_ITEM_SIZE)
             m_size = MIN_ITEM_SIZE;
         else if (m_size > MAX_ITEM_SIZE)
             m_size = MAX_ITEM_SIZE;
     } else {
         QGraphicsItem::mouseMoveEvent(event);
     }
 }

 void ItemBase::hoverMoveEvent(QGraphicsSceneHoverEvent *event)
 {
     if (m_isResizing || (isInResizeArea(event->pos()) && isSelected()))
         setCursor(Qt::SizeFDiagCursor);
     else
         setCursor(Qt::ArrowCursor);
     QGraphicsItem::hoverMoveEvent(event);
 }

 void ItemBase::mousePressEvent(QGraphicsSceneMouseEvent *event)
 {
     static qreal z = 0.0;
     setZValue(z += 1.0);
     if (event->button() == Qt::LeftButton && isInResizeArea(event->pos())) {
         m_isResizing = true;
     } else {
         QGraphicsItem::mousePressEvent(event);
     }
 }

 void ItemBase::mouseReleaseEvent(QGraphicsSceneMouseEvent *event)
 {
     if (event->button() == Qt::LeftButton && m_isResizing) {
         m_isResizing = false;
     } else {
         QGraphicsItem::mouseReleaseEvent(event);
     }
 }

 void ItemBase::keyPressEvent(QKeyEvent *event)
 {
     switch (event->key()) {
     case Qt::Key_Delete:
         deleteSelectedItems(scene());
         break;
     case Qt::Key_Insert:
         duplicateSelectedItems(scene());
         break;
     case Qt::Key_Plus:
         growSelectedItems(scene());
         break;
     case Qt::Key_Minus:
         shrinkSelectedItems(scene());
         break;
     default:
         QGraphicsItem::keyPressEvent(event);
         break;
     }
 }

 void ItemBase::wheelEvent(QGraphicsSceneWheelEvent *event)
 {
     prepareGeometryChange();
     m_size = int(m_size * qExp(-event->delta() / 600.0));
     m_size = qBound(MIN_ITEM_SIZE, m_size, MAX_ITEM_SIZE);
 }

 int ItemBase::type() const
 {
     return Type;
 }


 bool ItemBase::isInResizeArea(const QPointF &pos)
 {
     return (-pos.y() < pos.x() - m_size + 9);
 }

 //============================================================================//
 //                                    QtBox                                   //
 //============================================================================//

 QtBox::QtBox(int size, int x, int y) : ItemBase(size, x, y)
 {
     for (int i = 0; i < 8; ++i) {
         m_vertices[i].setX(i & 1 ? 0.5f : -0.5f);
         m_vertices[i].setY(i & 2 ? 0.5f : -0.5f);
         m_vertices[i].setZ(i & 4 ? 0.5f : -0.5f);
     }
     for (int i = 0; i < 4; ++i) {
         m_texCoords[i].setX(i & 1 ? 1.0f : 0.0f);
         m_texCoords[i].setY(i & 2 ? 1.0f : 0.0f);
     }
     m_normals[0] = QVector3D(-1.0f, 0.0f, 0.0f);
     m_normals[1] = QVector3D(1.0f, 0.0f, 0.0f);
     m_normals[2] = QVector3D(0.0f, -1.0f, 0.0f);
     m_normals[3] = QVector3D(0.0f, 1.0f, 0.0f);
     m_normals[4] = QVector3D(0.0f, 0.0f, -1.0f);
     m_normals[5] = QVector3D(0.0f, 0.0f, 1.0f);
 }

 QtBox::~QtBox()
 {
     delete m_texture;
 }

 ItemBase *QtBox::createNew(int size, int x, int y)
 {
     return new QtBox(size, x, y);
 }

 void QtBox::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
 {
     QRectF rect = boundingRect().translated(pos());
     float width = float(painter->device()->width());
     float height = float(painter->device()->height());

     float left = 2.0f * float(rect.left()) / width - 1.0f;
     float right = 2.0f * float(rect.right()) / width - 1.0f;
     float top = 1.0f - 2.0f * float(rect.top()) / height;
     float bottom = 1.0f - 2.0f * float(rect.bottom()) / height;
     float moveToRectMatrix[] = {
         0.5f * (right - left), 0.0f, 0.0f, 0.0f,
         0.0f, 0.5f * (bottom - top), 0.0f, 0.0f,
         0.0f, 0.0f, 1.0f, 0.0f,
         0.5f * (right + left), 0.5f * (bottom + top), 0.0f, 1.0f
     };

     painter->beginNativePainting();

     glMatrixMode(GL_PROJECTION);
     glPushMatrix();
     glLoadMatrixf(moveToRectMatrix);
     qgluPerspective(60.0, 1.0, 0.01, 10.0);

     glMatrixMode(GL_MODELVIEW);
     glPushMatrix();
     glLoadIdentity();

     //glEnable(GL_DEPTH_TEST);
     glEnable(GL_CULL_FACE);
     glEnable(GL_LIGHTING);
     glEnable(GL_COLOR_MATERIAL);
     glEnable(GL_NORMALIZE);

     if (m_texture == nullptr)
         m_texture = new GLTexture2D(":/res/boxes/qt-logo.jpg", 64, 64);
     m_texture->bind();
     glEnable(GL_TEXTURE_2D);

     glColorMaterial(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE);
     float lightColour[] = {1.0f, 1.0f, 1.0f, 1.0f};
     float lightDir[] = {0.0f, 0.0f, 1.0f, 0.0f};
     glLightfv(GL_LIGHT0, GL_DIFFUSE, lightColour);
     glLightfv(GL_LIGHT0, GL_POSITION, lightDir);
     glEnable(GL_LIGHT0);

     glTranslatef(0.0f, 0.0f, -1.5f);
     glRotatef(ROTATE_SPEED_X * m_startTime.msecsTo(QTime::currentTime()), 1.0f, 0.0f, 0.0f);
     glRotatef(ROTATE_SPEED_Y * m_startTime.msecsTo(QTime::currentTime()), 0.0f, 1.0f, 0.0f);
     glRotatef(ROTATE_SPEED_Z * m_startTime.msecsTo(QTime::currentTime()), 0.0f, 0.0f, 1.0f);
     int dt = m_startTime.msecsTo(QTime::currentTime());
     if (dt < 500)
         glScalef(dt / 500.0f, dt / 500.0f, dt / 500.0f);

     for (int dir = 0; dir < 3; ++dir) {
         glColor4f(1.0f, 1.0f, 1.0f, 1.0);

         glBegin(GL_TRIANGLE_STRIP);
         glNormal3fv(reinterpret_cast<float *>(&m_normals[2 * dir + 0]));
         for (int i = 0; i < 2; ++i) {
             for (int j = 0; j < 2; ++j) {
                 glTexCoord2fv(reinterpret_cast<float *>(&m_texCoords[(j << 1) | i]));
                 glVertex3fv(reinterpret_cast<float *>(&m_vertices[(i << ((dir + 2) % 3)) | (j << ((dir + 1) % 3))]));
             }
         }
         glEnd();

         glBegin(GL_TRIANGLE_STRIP);
         glNormal3fv(reinterpret_cast<float *>(&m_normals[2 * dir + 1]));
         for (int i = 0; i < 2; ++i) {
             for (int j = 0; j < 2; ++j) {
                 glTexCoord2fv(reinterpret_cast<float *>(&m_texCoords[(j << 1) | i]));
                 glVertex3fv(reinterpret_cast<float *>(&m_vertices[(1 << dir) | (i << ((dir + 1) % 3)) | (j << ((dir + 2) % 3))]));
             }
         }
         glEnd();
     }
     m_texture->unbind();

     //glDisable(GL_DEPTH_TEST);
     glDisable(GL_CULL_FACE);
     glDisable(GL_LIGHTING);
     glDisable(GL_COLOR_MATERIAL);
     glDisable(GL_TEXTURE_2D);
     glDisable(GL_LIGHT0);
     glDisable(GL_NORMALIZE);

     glPopMatrix();

     glMatrixMode(GL_PROJECTION);
     glPopMatrix();

     painter->endNativePainting();

     ItemBase::paint(painter, option, widget);
 }

 //============================================================================//
 //                                 CircleItem                                 //
 //============================================================================//

 CircleItem::CircleItem(int size, int x, int y) : ItemBase(size, x, y)
     , m_color(QColor::fromHsv(QRandomGenerator::global()->bounded(360), 255, 255))
 {}

 void CircleItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
 {
     int dt = m_startTime.msecsTo(QTime::currentTime());

     qreal r0 = 0.5 * m_size * (1.0 - qExp(-0.001 * ((dt + 3800) % 4000)));
     qreal r1 = 0.5 * m_size * (1.0 - qExp(-0.001 * ((dt + 0) % 4000)));
     qreal r2 = 0.5 * m_size * (1.0 - qExp(-0.001 * ((dt + 1800) % 4000)));
     qreal r3 = 0.5 * m_size * (1.0 - qExp(-0.001 * ((dt + 2000) % 4000)));

     if (r0 > r1)
         r0 = 0.0;
     if (r2 > r3)
         r2 = 0.0;

     QPainterPath path;
     path.moveTo(r1, 0.0);
     path.arcTo(-r1, -r1, 2 * r1, 2 * r1, 0.0, 360.0);
     path.lineTo(r0, 0.0);
     path.arcTo(-r0, -r0, 2 * r0, 2 * r0, 0.0, -360.0);
     path.closeSubpath();
     path.moveTo(r3, 0.0);
     path.arcTo(-r3, -r3, 2 * r3, 2 * r3, 0.0, 360.0);
     path.lineTo(r0, 0.0);
     path.arcTo(-r2, -r2, 2 * r2, 2 * r2, 0.0, -360.0);
     path.closeSubpath();
     painter->setRenderHint(QPainter::Antialiasing, true);
     painter->setBrush(QBrush(m_color));
     painter->setPen(Qt::NoPen);
     painter->drawPath(path);
     painter->setBrush(Qt::NoBrush);
     painter->setPen(Qt::SolidLine);
     painter->setRenderHint(QPainter::Antialiasing, false);

     ItemBase::paint(painter, option, widget);
 }

 ItemBase *CircleItem::createNew(int size, int x, int y)
 {
     return new CircleItem(size, x, y);
 }

 //============================================================================//
 //                                 SquareItem                                 //
 //============================================================================//

 SquareItem::SquareItem(int size, int x, int y) : ItemBase(size, x, y)
     , m_image(QPixmap(":/res/boxes/square.jpg"))
 {}

 void SquareItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
 {
     int dt = m_startTime.msecsTo(QTime::currentTime());
     QTransform oldTransform = painter->worldTransform();
     int dtMod = dt % 2000;
     qreal amp = 0.002 * (dtMod < 1000 ? dtMod : 2000 - dtMod) - 1.0;

     qreal scale = 0.6 + 0.2 * amp * amp;
     painter->setWorldTransform(QTransform().rotate(15.0 * amp).scale(scale, scale), true);

     painter->drawPixmap(-m_size / 2, -m_size / 2, m_size, m_size, m_image);

     painter->setWorldTransform(oldTransform, false);
     ItemBase::paint(painter, option, widget);
 }

 ItemBase *SquareItem::createNew(int size, int x, int y)
 {
     return new SquareItem(size, x, y);
 }
	/****************************************************************************
	**
	** Copyright (C) 2016 The Qt Company Ltd.
	** Contact: https://www.qt.io/licensing/
	**
	** This file is part of the demonstration applications of the Qt Toolkit.
	**
	** $QT_BEGIN_LICENSE:BSD$
	** Commercial License Usage
	** Licensees holding valid commercial Qt licenses may use this file in
	** accordance with the commercial license agreement provided with the
	** Software or, alternatively, in accordance with the terms contained in
	** a written agreement between you and The Qt Company. For licensing terms
	** and conditions see https://www.qt.io/terms-conditions. For further
	** information use the contact form at https://www.qt.io/contact-us.
	**
	** 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.
	** * Redistributions in binary form must reproduce the above copyright
	** notice, this list of conditions and the following disclaimer in
	** the documentation and/or other materials provided with the
	** distribution.
	** * Neither the name of The Qt Company Ltd nor the names of its
	** contributors may be used to endorse or promote products derived
	** from this software without specific prior written permission.
	**
	**
	** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
	** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
	** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
	** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
	**
	** $QT_END_LICENSE$
	**
	****************************************************************************/

	#include "qtbox.h"

	constexpr qreal ROTATE_SPEED_X = 30.0 / 1000.0;
	constexpr qreal ROTATE_SPEED_Y = 20.0 / 1000.0;
	constexpr qreal ROTATE_SPEED_Z = 40.0 / 1000.0;
	constexpr int MAX_ITEM_SIZE = 512;
	constexpr int MIN_ITEM_SIZE = 16;

	//============================================================================//
	// ItemBase //
	//============================================================================//

	ItemBase::ItemBase(int size, int x, int y) : m_size(size), m_startTime(QTime::currentTime())
	{
	setFlag(QGraphicsItem::ItemIsMovable, true);
	setFlag(QGraphicsItem::ItemIsSelectable, true);
	setFlag(QGraphicsItem::ItemIsFocusable, true);
	setAcceptHoverEvents(true);
	setPos(x, y);
	}

	QRectF ItemBase::boundingRect() const
	{
	return QRectF(-m_size / 2, -m_size / 2, m_size, m_size);
	}

	void ItemBase::paint(QPainter painter, const QStyleOptionGraphicsItem option, QWidget *)
	{
	if (option->state & QStyle::State_Selected) {
	painter->setRenderHint(QPainter::Antialiasing, true);
	if (option->state & QStyle::State_HasFocus)
	painter->setPen(Qt::yellow);
	else
	painter->setPen(Qt::white);
	painter->drawRect(boundingRect());

	painter->drawLine(m_size / 2 - 9, m_size / 2, m_size / 2, m_size / 2 - 9);
	painter->drawLine(m_size / 2 - 6, m_size / 2, m_size / 2, m_size / 2 - 6);
	painter->drawLine(m_size / 2 - 3, m_size / 2, m_size / 2, m_size / 2 - 3);

	painter->setRenderHint(QPainter::Antialiasing, false);
	}
	}

	void ItemBase::contextMenuEvent(QGraphicsSceneContextMenuEvent *event)
	{
	if (!isSelected() && scene()) {
	scene()->clearSelection();
	setSelected(true);
	}

	QMenu menu;
	QAction *delAction = menu.addAction("Delete");
	QAction *newAction = menu.addAction("New");
	QAction *growAction = menu.addAction("Grow");
	QAction *shrinkAction = menu.addAction("Shrink");

	QAction *selectedAction = menu.exec(event->screenPos());

	if (selectedAction == delAction)
	deleteSelectedItems(scene());
	else if (selectedAction == newAction)
	duplicateSelectedItems(scene());
	else if (selectedAction == growAction)
	growSelectedItems(scene());
	else if (selectedAction == shrinkAction)
	shrinkSelectedItems(scene());
	}

	void ItemBase::duplicateSelectedItems(QGraphicsScene *scene)
	{
	if (!scene)
	return;

	const QList<QGraphicsItem *> selected = scene->selectedItems();
	for (QGraphicsItem *item : selected) {
	ItemBase itemBase = qgraphicsitem_cast<ItemBase >(item);
	if (itemBase)
	scene->addItem(itemBase->createNew(itemBase->m_size, itemBase->pos().x() + itemBase->m_size, itemBase->pos().y()));
	}
	}

	void ItemBase::deleteSelectedItems(QGraphicsScene *scene)
	{
	if (!scene)
	return;

	const QList<QGraphicsItem *> selected = scene->selectedItems();
	for (QGraphicsItem *item : selected) {
	ItemBase itemBase = qgraphicsitem_cast<ItemBase >(item);
	if (itemBase)
	delete itemBase;
	}
	}

	void ItemBase::growSelectedItems(QGraphicsScene *scene)
	{
	if (!scene)
	return;

	const QList<QGraphicsItem *> selected = scene->selectedItems();
	for (QGraphicsItem *item : selected) {
	ItemBase itemBase = qgraphicsitem_cast<ItemBase >(item);
	if (itemBase) {
	itemBase->prepareGeometryChange();
	itemBase->m_size *= 2;
	if (itemBase->m_size > MAX_ITEM_SIZE)
	itemBase->m_size = MAX_ITEM_SIZE;
	}
	}
	}

	void ItemBase::shrinkSelectedItems(QGraphicsScene *scene)
	{
	if (!scene)
	return;

	const QList<QGraphicsItem *> selected = scene->selectedItems();
	for (QGraphicsItem *item : selected) {
	ItemBase itemBase = qgraphicsitem_cast<ItemBase >(item);
	if (itemBase) {
	itemBase->prepareGeometryChange();
	itemBase->m_size /= 2;
	if (itemBase->m_size < MIN_ITEM_SIZE)
	itemBase->m_size = MIN_ITEM_SIZE;
	}
	}
	}

	void ItemBase::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
	{
	if (m_isResizing) {
	int dx = int(2.0 * event->pos().x());
	int dy = int(2.0 * event->pos().y());
	prepareGeometryChange();
	m_size = (dx > dy ? dx : dy);
	if (m_size < MIN_ITEM_SIZE)
	m_size = MIN_ITEM_SIZE;
	else if (m_size > MAX_ITEM_SIZE)
	m_size = MAX_ITEM_SIZE;
	} else {
	QGraphicsItem::mouseMoveEvent(event);
	}
	}

	void ItemBase::hoverMoveEvent(QGraphicsSceneHoverEvent *event)
	{
	if (m_isResizing \|\| (isInResizeArea(event->pos()) && isSelected()))
	setCursor(Qt::SizeFDiagCursor);
	else
	setCursor(Qt::ArrowCursor);
	QGraphicsItem::hoverMoveEvent(event);
	}

	void ItemBase::mousePressEvent(QGraphicsSceneMouseEvent *event)
	{
	static qreal z = 0.0;
	setZValue(z += 1.0);
	if (event->button() == Qt::LeftButton && isInResizeArea(event->pos())) {
	m_isResizing = true;
	} else {
	QGraphicsItem::mousePressEvent(event);
	}
	}

	void ItemBase::mouseReleaseEvent(QGraphicsSceneMouseEvent *event)
	{
	if (event->button() == Qt::LeftButton && m_isResizing) {
	m_isResizing = false;
	} else {
	QGraphicsItem::mouseReleaseEvent(event);
	}
	}

	void ItemBase::keyPressEvent(QKeyEvent *event)
	{
	switch (event->key()) {
	case Qt::Key_Delete:
	deleteSelectedItems(scene());
	break;
	case Qt::Key_Insert:
	duplicateSelectedItems(scene());
	break;
	case Qt::Key_Plus:
	growSelectedItems(scene());
	break;
	case Qt::Key_Minus:
	shrinkSelectedItems(scene());
	break;
	default:
	QGraphicsItem::keyPressEvent(event);
	break;
	}
	}

	void ItemBase::wheelEvent(QGraphicsSceneWheelEvent *event)
	{
	prepareGeometryChange();
	m_size = int(m_size * qExp(-event->delta() / 600.0));
	m_size = qBound(MIN_ITEM_SIZE, m_size, MAX_ITEM_SIZE);
	}

	int ItemBase::type() const
	{
	return Type;
	}


	bool ItemBase::isInResizeArea(const QPointF &pos)
	{
	return (-pos.y() < pos.x() - m_size + 9);
	}

	//============================================================================//
	// QtBox //
	//============================================================================//

	QtBox::QtBox(int size, int x, int y) : ItemBase(size, x, y)
	{
	for (int i = 0; i < 8; ++i) {
	m_vertices[i].setX(i & 1 ? 0.5f : -0.5f);
	m_vertices[i].setY(i & 2 ? 0.5f : -0.5f);
	m_vertices[i].setZ(i & 4 ? 0.5f : -0.5f);
	}
	for (int i = 0; i < 4; ++i) {
	m_texCoords[i].setX(i & 1 ? 1.0f : 0.0f);
	m_texCoords[i].setY(i & 2 ? 1.0f : 0.0f);
	}
	m_normals[0] = QVector3D(-1.0f, 0.0f, 0.0f);
	m_normals[1] = QVector3D(1.0f, 0.0f, 0.0f);
	m_normals[2] = QVector3D(0.0f, -1.0f, 0.0f);
	m_normals[3] = QVector3D(0.0f, 1.0f, 0.0f);
	m_normals[4] = QVector3D(0.0f, 0.0f, -1.0f);
	m_normals[5] = QVector3D(0.0f, 0.0f, 1.0f);
	}

	QtBox::~QtBox()
	{
	delete m_texture;
	}

	ItemBase *QtBox::createNew(int size, int x, int y)
	{
	return new QtBox(size, x, y);
	}

	void QtBox::paint(QPainter painter, const QStyleOptionGraphicsItem option, QWidget *widget)
	{
	QRectF rect = boundingRect().translated(pos());
	float width = float(painter->device()->width());
	float height = float(painter->device()->height());

	float left = 2.0f * float(rect.left()) / width - 1.0f;
	float right = 2.0f * float(rect.right()) / width - 1.0f;
	float top = 1.0f - 2.0f * float(rect.top()) / height;
	float bottom = 1.0f - 2.0f * float(rect.bottom()) / height;
	float moveToRectMatrix[] = {
	0.5f * (right - left), 0.0f, 0.0f, 0.0f,
	0.0f, 0.5f * (bottom - top), 0.0f, 0.0f,
	0.0f, 0.0f, 1.0f, 0.0f,
	0.5f * (right + left), 0.5f * (bottom + top), 0.0f, 1.0f
	};

	painter->beginNativePainting();

	glMatrixMode(GL_PROJECTION);
	glPushMatrix();
	glLoadMatrixf(moveToRectMatrix);
	qgluPerspective(60.0, 1.0, 0.01, 10.0);

	glMatrixMode(GL_MODELVIEW);
	glPushMatrix();
	glLoadIdentity();

	//glEnable(GL_DEPTH_TEST);
	glEnable(GL_CULL_FACE);
	glEnable(GL_LIGHTING);
	glEnable(GL_COLOR_MATERIAL);
	glEnable(GL_NORMALIZE);

	if (m_texture == nullptr)
	m_texture = new GLTexture2D(":/res/boxes/qt-logo.jpg", 64, 64);
	m_texture->bind();
	glEnable(GL_TEXTURE_2D);

	glColorMaterial(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE);
	float lightColour[] = {1.0f, 1.0f, 1.0f, 1.0f};
	float lightDir[] = {0.0f, 0.0f, 1.0f, 0.0f};
	glLightfv(GL_LIGHT0, GL_DIFFUSE, lightColour);
	glLightfv(GL_LIGHT0, GL_POSITION, lightDir);
	glEnable(GL_LIGHT0);

	glTranslatef(0.0f, 0.0f, -1.5f);
	glRotatef(ROTATE_SPEED_X * m_startTime.msecsTo(QTime::currentTime()), 1.0f, 0.0f, 0.0f);
	glRotatef(ROTATE_SPEED_Y * m_startTime.msecsTo(QTime::currentTime()), 0.0f, 1.0f, 0.0f);
	glRotatef(ROTATE_SPEED_Z * m_startTime.msecsTo(QTime::currentTime()), 0.0f, 0.0f, 1.0f);
	int dt = m_startTime.msecsTo(QTime::currentTime());
	if (dt < 500)
	glScalef(dt / 500.0f, dt / 500.0f, dt / 500.0f);

	for (int dir = 0; dir < 3; ++dir) {
	glColor4f(1.0f, 1.0f, 1.0f, 1.0);

	glBegin(GL_TRIANGLE_STRIP);
	glNormal3fv(reinterpret_cast<float >(&m_normals[2 dir + 0]));
	for (int i = 0; i < 2; ++i) {
	for (int j = 0; j < 2; ++j) {
	glTexCoord2fv(reinterpret_cast<float *>(&m_texCoords[(j << 1) \| i]));
	glVertex3fv(reinterpret_cast<float *>(&m_vertices[(i << ((dir + 2) % 3)) \| (j << ((dir + 1) % 3))]));
	}
	}
	glEnd();

	glBegin(GL_TRIANGLE_STRIP);
	glNormal3fv(reinterpret_cast<float >(&m_normals[2 dir + 1]));
	for (int i = 0; i < 2; ++i) {
	for (int j = 0; j < 2; ++j) {
	glTexCoord2fv(reinterpret_cast<float *>(&m_texCoords[(j << 1) \| i]));
	glVertex3fv(reinterpret_cast<float *>(&m_vertices[(1 << dir) \| (i << ((dir + 1) % 3)) \| (j << ((dir + 2) % 3))]));
	}
	}
	glEnd();
	}
	m_texture->unbind();

	//glDisable(GL_DEPTH_TEST);
	glDisable(GL_CULL_FACE);
	glDisable(GL_LIGHTING);
	glDisable(GL_COLOR_MATERIAL);
	glDisable(GL_TEXTURE_2D);
	glDisable(GL_LIGHT0);
	glDisable(GL_NORMALIZE);

	glPopMatrix();

	glMatrixMode(GL_PROJECTION);
	glPopMatrix();

	painter->endNativePainting();

	ItemBase::paint(painter, option, widget);
	}

	//============================================================================//
	// CircleItem //
	//============================================================================//

	CircleItem::CircleItem(int size, int x, int y) : ItemBase(size, x, y)
	, m_color(QColor::fromHsv(QRandomGenerator::global()->bounded(360), 255, 255))
	{}

	void CircleItem::paint(QPainter painter, const QStyleOptionGraphicsItem option, QWidget *widget)
	{
	int dt = m_startTime.msecsTo(QTime::currentTime());

	qreal r0 = 0.5 * m_size * (1.0 - qExp(-0.001 * ((dt + 3800) % 4000)));
	qreal r1 = 0.5 * m_size * (1.0 - qExp(-0.001 * ((dt + 0) % 4000)));
	qreal r2 = 0.5 * m_size * (1.0 - qExp(-0.001 * ((dt + 1800) % 4000)));
	qreal r3 = 0.5 * m_size * (1.0 - qExp(-0.001 * ((dt + 2000) % 4000)));

	if (r0 > r1)
	r0 = 0.0;
	if (r2 > r3)
	r2 = 0.0;

	QPainterPath path;
	path.moveTo(r1, 0.0);
	path.arcTo(-r1, -r1, 2 * r1, 2 * r1, 0.0, 360.0);
	path.lineTo(r0, 0.0);
	path.arcTo(-r0, -r0, 2 * r0, 2 * r0, 0.0, -360.0);
	path.closeSubpath();
	path.moveTo(r3, 0.0);
	path.arcTo(-r3, -r3, 2 * r3, 2 * r3, 0.0, 360.0);
	path.lineTo(r0, 0.0);
	path.arcTo(-r2, -r2, 2 * r2, 2 * r2, 0.0, -360.0);
	path.closeSubpath();
	painter->setRenderHint(QPainter::Antialiasing, true);
	painter->setBrush(QBrush(m_color));
	painter->setPen(Qt::NoPen);
	painter->drawPath(path);
	painter->setBrush(Qt::NoBrush);
	painter->setPen(Qt::SolidLine);
	painter->setRenderHint(QPainter::Antialiasing, false);

	ItemBase::paint(painter, option, widget);
	}

	ItemBase *CircleItem::createNew(int size, int x, int y)
	{
	return new CircleItem(size, x, y);
	}

	//============================================================================//
	// SquareItem //
	//============================================================================//

	SquareItem::SquareItem(int size, int x, int y) : ItemBase(size, x, y)
	, m_image(QPixmap(":/res/boxes/square.jpg"))
	{}

	void SquareItem::paint(QPainter painter, const QStyleOptionGraphicsItem option, QWidget *widget)
	{
	int dt = m_startTime.msecsTo(QTime::currentTime());
	QTransform oldTransform = painter->worldTransform();
	int dtMod = dt % 2000;
	qreal amp = 0.002 * (dtMod < 1000 ? dtMod : 2000 - dtMod) - 1.0;

	qreal scale = 0.6 + 0.2 * amp * amp;
	painter->setWorldTransform(QTransform().rotate(15.0 * amp).scale(scale, scale), true);

	painter->drawPixmap(-m_size / 2, -m_size / 2, m_size, m_size, m_image);

	painter->setWorldTransform(oldTransform, false);
	ItemBase::paint(painter, option, widget);
	}

	ItemBase *SquareItem::createNew(int size, int x, int y)
	{
	return new SquareItem(size, x, y);
	}