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<td width="1"> </td><td class="postheader" valign="center"><a href="index.html"><font color="#004faf">Home</font></a> · <a href="classes.html"><font color="#004faf">All Classes</font></a> · <a href="functions.html"><font color="#004faf">All Functions</font></a> · <a href="overviews.html"><font color="#004faf">Overviews</font></a></td></tr></table><h1 class="title">qtbox.cpp Example File<br /><span class="small-subtitle">demos/boxes/qtbox.cpp</span>
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<pre><span class="comment"> /****************************************************************************
**
** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the demonstration applications of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial Usage
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you have questions regarding the use of this file, please contact
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****************************************************************************/</span>
#include "qtbox.h"
const qreal ROTATE_SPEED_X = 30.0 / 1000.0;
const qreal ROTATE_SPEED_Y = 20.0 / 1000.0;
const qreal ROTATE_SPEED_Z = 40.0 / 1000.0;
const int MAX_ITEM_SIZE = 512;
const int MIN_ITEM_SIZE = 16;
<span class="comment"> //============================================================================//</span>
<span class="comment"> // ItemBase //</span>
<span class="comment"> //============================================================================//</span>
ItemBase::ItemBase(int size, int x, int y) : m_size(size), m_isResizing(false)
{
setFlag(QGraphicsItem::ItemIsMovable, true);
setFlag(QGraphicsItem::ItemIsSelectable, true);
setFlag(QGraphicsItem::ItemIsFocusable, true);
setAcceptHoverEvents(true);
setPos(x, y);
m_startTime = QTime::currentTime();
}
ItemBase::~ItemBase()
{
}
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;
QList<QGraphicsItem *> selected;
selected = scene->selectedItems();
foreach (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;
QList<QGraphicsItem *> selected;
selected = scene->selectedItems();
foreach (QGraphicsItem *item, selected) {
ItemBase *itemBase = qgraphicsitem_cast<ItemBase *>(item);
if (itemBase)
delete itemBase;
}
}
void ItemBase::growSelectedItems(QGraphicsScene *scene)
{
if (!scene)
return;
QList<QGraphicsItem *> selected;
selected = scene->selectedItems();
foreach (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;
QList<QGraphicsItem *> selected;
selected = scene->selectedItems();
foreach (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 * exp(-event->delta() / 600.0));
if (m_size > MAX_ITEM_SIZE)
m_size = MAX_ITEM_SIZE;
else if (m_size < MIN_ITEM_SIZE)
m_size = MIN_ITEM_SIZE;
}
int ItemBase::type() const
{
return Type;
}
bool ItemBase::isInResizeArea(const QPointF &pos)
{
return (-pos.y() < pos.x() - m_size + 9);
}
<span class="comment"> //============================================================================//</span>
<span class="comment"> // QtBox //</span>
<span class="comment"> //============================================================================//</span>
QtBox::QtBox(int size, int x, int y) : ItemBase(size, x, y), m_texture(0)
{
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()
{
if (m_texture)
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);
gluPerspective(60.0, 1.0, 0.01, 10.0);
glMatrixMode(GL_MODELVIEW);
glPushMatrix();
glLoadIdentity();
<span class="comment">//glEnable(GL_DEPTH_TEST);</span>
glEnable(GL_CULL_FACE);
glEnable(GL_LIGHTING);
glEnable(GL_COLOR_MATERIAL);
glEnable(GL_NORMALIZE);
if(m_texture == 0)
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();
<span class="comment">//glDisable(GL_DEPTH_TEST);</span>
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);
}
<span class="comment"> //============================================================================//</span>
<span class="comment"> // CircleItem //</span>
<span class="comment"> //============================================================================//</span>
CircleItem::CircleItem(int size, int x, int y) : ItemBase(size, x, y)
{
m_color = QColor::fromHsv(rand() % 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 - exp(-0.001 * ((dt + 3800) % 4000)));
qreal r1 = 0.5 * m_size * (1.0 - exp(-0.001 * ((dt + 0) % 4000)));
qreal r2 = 0.5 * m_size * (1.0 - exp(-0.001 * ((dt + 1800) % 4000)));
qreal r3 = 0.5 * m_size * (1.0 - exp(-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);
}
<span class="comment"> //============================================================================//</span>
<span class="comment"> // SquareItem //</span>
<span class="comment"> //============================================================================//</span>
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);
}</pre>
<p /><address><hr /><div align="center">
<table width="100%" cellspacing="0" border="0"><tr class="address">
<td width="40%" align="left">Copyright © 2010 Nokia Corporation and/or its subsidiary(-ies)</td>
<td width="20%" align="center"><a href="trademarks.html">Trademarks</a></td>
<td width="40%" align="right"><div align="right">Qt 4.6.3</div></td>
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