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<h1 class="title">qtbox.cpp Example File</h1>
<span class="small-subtitle">demos/boxes/qtbox.cpp</span>
<!-- $$$demos/boxes/qtbox.cpp-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp"> <span class="comment">/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the demonstration applications of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** 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 http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/contact-us.
**
** 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 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** As a special exception, The Qt Company gives you certain additional
** rights. These rights are described in The Qt Company 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.
**
** $QT_END_LICENSE$
**
****************************************************************************/</span>
<span class="preprocessor">#include "qtbox.h"</span>
<span class="keyword">const</span> <span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> ROTATE_SPEED_X <span class="operator">=</span> <span class="number">30.0</span> <span class="operator">/</span> <span class="number">1000.0</span>;
<span class="keyword">const</span> <span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> ROTATE_SPEED_Y <span class="operator">=</span> <span class="number">20.0</span> <span class="operator">/</span> <span class="number">1000.0</span>;
<span class="keyword">const</span> <span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> ROTATE_SPEED_Z <span class="operator">=</span> <span class="number">40.0</span> <span class="operator">/</span> <span class="number">1000.0</span>;
<span class="keyword">const</span> <span class="type">int</span> MAX_ITEM_SIZE <span class="operator">=</span> <span class="number">512</span>;
<span class="keyword">const</span> <span class="type">int</span> MIN_ITEM_SIZE <span class="operator">=</span> <span class="number">16</span>;
<span class="comment">//============================================================================//</span>
<span class="comment">// ItemBase //</span>
<span class="comment">//============================================================================//</span>
ItemBase<span class="operator">::</span>ItemBase(<span class="type">int</span> size<span class="operator">,</span> <span class="type">int</span> x<span class="operator">,</span> <span class="type">int</span> y) : m_size(size)<span class="operator">,</span> m_isResizing(<span class="keyword">false</span>)
{
setFlag(<span class="type"><a href="qgraphicsitem.html">QGraphicsItem</a></span><span class="operator">::</span>ItemIsMovable<span class="operator">,</span> <span class="keyword">true</span>);
setFlag(<span class="type"><a href="qgraphicsitem.html">QGraphicsItem</a></span><span class="operator">::</span>ItemIsSelectable<span class="operator">,</span> <span class="keyword">true</span>);
setFlag(<span class="type"><a href="qgraphicsitem.html">QGraphicsItem</a></span><span class="operator">::</span>ItemIsFocusable<span class="operator">,</span> <span class="keyword">true</span>);
setAcceptHoverEvents(<span class="keyword">true</span>);
setPos(x<span class="operator">,</span> y);
m_startTime <span class="operator">=</span> <span class="type"><a href="qtime.html">QTime</a></span><span class="operator">::</span>currentTime();
}
ItemBase<span class="operator">::</span><span class="operator">~</span>ItemBase()
{
}
<span class="type"><a href="qrectf.html">QRectF</a></span> ItemBase<span class="operator">::</span>boundingRect() <span class="keyword">const</span>
{
<span class="keyword">return</span> <span class="type"><a href="qrectf.html">QRectF</a></span>(<span class="operator">-</span>m_size <span class="operator">/</span> <span class="number">2</span><span class="operator">,</span> <span class="operator">-</span>m_size <span class="operator">/</span> <span class="number">2</span><span class="operator">,</span> m_size<span class="operator">,</span> m_size);
}
<span class="type">void</span> ItemBase<span class="operator">::</span>paint(<span class="type"><a href="qpainter.html">QPainter</a></span> <span class="operator">*</span>painter<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="qstyleoptiongraphicsitem.html">QStyleOptionGraphicsItem</a></span> <span class="operator">*</span>option<span class="operator">,</span> <span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>)
{
<span class="keyword">if</span> (option<span class="operator">-</span><span class="operator">></span>state <span class="operator">&</span> <span class="type"><a href="qstyle.html">QStyle</a></span><span class="operator">::</span>State_Selected) {
painter<span class="operator">-</span><span class="operator">></span>setRenderHint(<span class="type"><a href="qpainter.html">QPainter</a></span><span class="operator">::</span>Antialiasing<span class="operator">,</span> <span class="keyword">true</span>);
<span class="keyword">if</span> (option<span class="operator">-</span><span class="operator">></span>state <span class="operator">&</span> <span class="type"><a href="qstyle.html">QStyle</a></span><span class="operator">::</span>State_HasFocus)
painter<span class="operator">-</span><span class="operator">></span>setPen(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>yellow);
<span class="keyword">else</span>
painter<span class="operator">-</span><span class="operator">></span>setPen(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>white);
painter<span class="operator">-</span><span class="operator">></span>drawRect(boundingRect());
painter<span class="operator">-</span><span class="operator">></span>drawLine(m_size <span class="operator">/</span> <span class="number">2</span> <span class="operator">-</span> <span class="number">9</span><span class="operator">,</span> m_size <span class="operator">/</span> <span class="number">2</span><span class="operator">,</span> m_size <span class="operator">/</span> <span class="number">2</span><span class="operator">,</span> m_size <span class="operator">/</span> <span class="number">2</span> <span class="operator">-</span> <span class="number">9</span>);
painter<span class="operator">-</span><span class="operator">></span>drawLine(m_size <span class="operator">/</span> <span class="number">2</span> <span class="operator">-</span> <span class="number">6</span><span class="operator">,</span> m_size <span class="operator">/</span> <span class="number">2</span><span class="operator">,</span> m_size <span class="operator">/</span> <span class="number">2</span><span class="operator">,</span> m_size <span class="operator">/</span> <span class="number">2</span> <span class="operator">-</span> <span class="number">6</span>);
painter<span class="operator">-</span><span class="operator">></span>drawLine(m_size <span class="operator">/</span> <span class="number">2</span> <span class="operator">-</span> <span class="number">3</span><span class="operator">,</span> m_size <span class="operator">/</span> <span class="number">2</span><span class="operator">,</span> m_size <span class="operator">/</span> <span class="number">2</span><span class="operator">,</span> m_size <span class="operator">/</span> <span class="number">2</span> <span class="operator">-</span> <span class="number">3</span>);
painter<span class="operator">-</span><span class="operator">></span>setRenderHint(<span class="type"><a href="qpainter.html">QPainter</a></span><span class="operator">::</span>Antialiasing<span class="operator">,</span> <span class="keyword">false</span>);
}
}
<span class="type">void</span> ItemBase<span class="operator">::</span>contextMenuEvent(<span class="type"><a href="qgraphicsscenecontextmenuevent.html">QGraphicsSceneContextMenuEvent</a></span> <span class="operator">*</span>event)
{
<span class="keyword">if</span> (<span class="operator">!</span>isSelected() <span class="operator">&</span><span class="operator">&</span> scene()) {
scene()<span class="operator">-</span><span class="operator">></span>clearSelection();
setSelected(<span class="keyword">true</span>);
}
<span class="type"><a href="qmenu.html">QMenu</a></span> menu;
<span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>delAction <span class="operator">=</span> menu<span class="operator">.</span>addAction(<span class="string">"Delete"</span>);
<span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>newAction <span class="operator">=</span> menu<span class="operator">.</span>addAction(<span class="string">"New"</span>);
<span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>growAction <span class="operator">=</span> menu<span class="operator">.</span>addAction(<span class="string">"Grow"</span>);
<span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>shrinkAction <span class="operator">=</span> menu<span class="operator">.</span>addAction(<span class="string">"Shrink"</span>);
<span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>selectedAction <span class="operator">=</span> menu<span class="operator">.</span>exec(event<span class="operator">-</span><span class="operator">></span>screenPos());
<span class="keyword">if</span> (selectedAction <span class="operator">=</span><span class="operator">=</span> delAction)
deleteSelectedItems(scene());
<span class="keyword">else</span> <span class="keyword">if</span> (selectedAction <span class="operator">=</span><span class="operator">=</span> newAction)
duplicateSelectedItems(scene());
<span class="keyword">else</span> <span class="keyword">if</span> (selectedAction <span class="operator">=</span><span class="operator">=</span> growAction)
growSelectedItems(scene());
<span class="keyword">else</span> <span class="keyword">if</span> (selectedAction <span class="operator">=</span><span class="operator">=</span> shrinkAction)
shrinkSelectedItems(scene());
}
<span class="type">void</span> ItemBase<span class="operator">::</span>duplicateSelectedItems(<span class="type"><a href="qgraphicsscene.html">QGraphicsScene</a></span> <span class="operator">*</span>scene)
{
<span class="keyword">if</span> (<span class="operator">!</span>scene)
<span class="keyword">return</span>;
<span class="type"><a href="qlist.html">QList</a></span><span class="operator"><</span><span class="type"><a href="qgraphicsitem.html">QGraphicsItem</a></span> <span class="operator">*</span><span class="operator">></span> selected;
selected <span class="operator">=</span> scene<span class="operator">-</span><span class="operator">></span>selectedItems();
foreach (<span class="type"><a href="qgraphicsitem.html">QGraphicsItem</a></span> <span class="operator">*</span>item<span class="operator">,</span> selected) {
ItemBase <span class="operator">*</span>itemBase <span class="operator">=</span> qgraphicsitem_cast<span class="operator"><</span>ItemBase <span class="operator">*</span><span class="operator">></span>(item);
<span class="keyword">if</span> (itemBase)
scene<span class="operator">-</span><span class="operator">></span>addItem(itemBase<span class="operator">-</span><span class="operator">></span>createNew(itemBase<span class="operator">-</span><span class="operator">></span>m_size<span class="operator">,</span> itemBase<span class="operator">-</span><span class="operator">></span>pos()<span class="operator">.</span>x() <span class="operator">+</span> itemBase<span class="operator">-</span><span class="operator">></span>m_size<span class="operator">,</span> itemBase<span class="operator">-</span><span class="operator">></span>pos()<span class="operator">.</span>y()));
}
}
<span class="type">void</span> ItemBase<span class="operator">::</span>deleteSelectedItems(<span class="type"><a href="qgraphicsscene.html">QGraphicsScene</a></span> <span class="operator">*</span>scene)
{
<span class="keyword">if</span> (<span class="operator">!</span>scene)
<span class="keyword">return</span>;
<span class="type"><a href="qlist.html">QList</a></span><span class="operator"><</span><span class="type"><a href="qgraphicsitem.html">QGraphicsItem</a></span> <span class="operator">*</span><span class="operator">></span> selected;
selected <span class="operator">=</span> scene<span class="operator">-</span><span class="operator">></span>selectedItems();
foreach (<span class="type"><a href="qgraphicsitem.html">QGraphicsItem</a></span> <span class="operator">*</span>item<span class="operator">,</span> selected) {
ItemBase <span class="operator">*</span>itemBase <span class="operator">=</span> qgraphicsitem_cast<span class="operator"><</span>ItemBase <span class="operator">*</span><span class="operator">></span>(item);
<span class="keyword">if</span> (itemBase)
<span class="keyword">delete</span> itemBase;
}
}
<span class="type">void</span> ItemBase<span class="operator">::</span>growSelectedItems(<span class="type"><a href="qgraphicsscene.html">QGraphicsScene</a></span> <span class="operator">*</span>scene)
{
<span class="keyword">if</span> (<span class="operator">!</span>scene)
<span class="keyword">return</span>;
<span class="type"><a href="qlist.html">QList</a></span><span class="operator"><</span><span class="type"><a href="qgraphicsitem.html">QGraphicsItem</a></span> <span class="operator">*</span><span class="operator">></span> selected;
selected <span class="operator">=</span> scene<span class="operator">-</span><span class="operator">></span>selectedItems();
foreach (<span class="type"><a href="qgraphicsitem.html">QGraphicsItem</a></span> <span class="operator">*</span>item<span class="operator">,</span> selected) {
ItemBase <span class="operator">*</span>itemBase <span class="operator">=</span> qgraphicsitem_cast<span class="operator"><</span>ItemBase <span class="operator">*</span><span class="operator">></span>(item);
<span class="keyword">if</span> (itemBase) {
itemBase<span class="operator">-</span><span class="operator">></span>prepareGeometryChange();
itemBase<span class="operator">-</span><span class="operator">></span>m_size <span class="operator">*</span><span class="operator">=</span> <span class="number">2</span>;
<span class="keyword">if</span> (itemBase<span class="operator">-</span><span class="operator">></span>m_size <span class="operator">></span> MAX_ITEM_SIZE)
itemBase<span class="operator">-</span><span class="operator">></span>m_size <span class="operator">=</span> MAX_ITEM_SIZE;
}
}
}
<span class="type">void</span> ItemBase<span class="operator">::</span>shrinkSelectedItems(<span class="type"><a href="qgraphicsscene.html">QGraphicsScene</a></span> <span class="operator">*</span>scene)
{
<span class="keyword">if</span> (<span class="operator">!</span>scene)
<span class="keyword">return</span>;
<span class="type"><a href="qlist.html">QList</a></span><span class="operator"><</span><span class="type"><a href="qgraphicsitem.html">QGraphicsItem</a></span> <span class="operator">*</span><span class="operator">></span> selected;
selected <span class="operator">=</span> scene<span class="operator">-</span><span class="operator">></span>selectedItems();
foreach (<span class="type"><a href="qgraphicsitem.html">QGraphicsItem</a></span> <span class="operator">*</span>item<span class="operator">,</span> selected) {
ItemBase <span class="operator">*</span>itemBase <span class="operator">=</span> qgraphicsitem_cast<span class="operator"><</span>ItemBase <span class="operator">*</span><span class="operator">></span>(item);
<span class="keyword">if</span> (itemBase) {
itemBase<span class="operator">-</span><span class="operator">></span>prepareGeometryChange();
itemBase<span class="operator">-</span><span class="operator">></span>m_size <span class="operator">/</span><span class="operator">=</span> <span class="number">2</span>;
<span class="keyword">if</span> (itemBase<span class="operator">-</span><span class="operator">></span>m_size <span class="operator"><</span> MIN_ITEM_SIZE)
itemBase<span class="operator">-</span><span class="operator">></span>m_size <span class="operator">=</span> MIN_ITEM_SIZE;
}
}
}
<span class="type">void</span> ItemBase<span class="operator">::</span>mouseMoveEvent(<span class="type"><a href="qgraphicsscenemouseevent.html">QGraphicsSceneMouseEvent</a></span> <span class="operator">*</span>event)
{
<span class="keyword">if</span> (m_isResizing) {
<span class="type">int</span> dx <span class="operator">=</span> <span class="type">int</span>(<span class="number">2.0</span> <span class="operator">*</span> event<span class="operator">-</span><span class="operator">></span>pos()<span class="operator">.</span>x());
<span class="type">int</span> dy <span class="operator">=</span> <span class="type">int</span>(<span class="number">2.0</span> <span class="operator">*</span> event<span class="operator">-</span><span class="operator">></span>pos()<span class="operator">.</span>y());
prepareGeometryChange();
m_size <span class="operator">=</span> (dx <span class="operator">></span> dy <span class="operator">?</span> dx : dy);
<span class="keyword">if</span> (m_size <span class="operator"><</span> MIN_ITEM_SIZE)
m_size <span class="operator">=</span> MIN_ITEM_SIZE;
<span class="keyword">else</span> <span class="keyword">if</span> (m_size <span class="operator">></span> MAX_ITEM_SIZE)
m_size <span class="operator">=</span> MAX_ITEM_SIZE;
} <span class="keyword">else</span> {
<span class="type"><a href="qgraphicsitem.html">QGraphicsItem</a></span><span class="operator">::</span>mouseMoveEvent(event);
}
}
<span class="type">void</span> ItemBase<span class="operator">::</span>hoverMoveEvent(<span class="type"><a href="qgraphicsscenehoverevent.html">QGraphicsSceneHoverEvent</a></span> <span class="operator">*</span>event)
{
<span class="keyword">if</span> (m_isResizing <span class="operator">|</span><span class="operator">|</span> (isInResizeArea(event<span class="operator">-</span><span class="operator">></span>pos()) <span class="operator">&</span><span class="operator">&</span> isSelected()))
setCursor(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>SizeFDiagCursor);
<span class="keyword">else</span>
setCursor(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>ArrowCursor);
<span class="type"><a href="qgraphicsitem.html">QGraphicsItem</a></span><span class="operator">::</span>hoverMoveEvent(event);
}
<span class="type">void</span> ItemBase<span class="operator">::</span>mousePressEvent(<span class="type"><a href="qgraphicsscenemouseevent.html">QGraphicsSceneMouseEvent</a></span> <span class="operator">*</span>event)
{
<span class="keyword">static</span> <span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> z <span class="operator">=</span> <span class="number">0.0</span>;
setZValue(z <span class="operator">+</span><span class="operator">=</span> <span class="number">1.0</span>);
<span class="keyword">if</span> (event<span class="operator">-</span><span class="operator">></span>button() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>LeftButton <span class="operator">&</span><span class="operator">&</span> isInResizeArea(event<span class="operator">-</span><span class="operator">></span>pos())) {
m_isResizing <span class="operator">=</span> <span class="keyword">true</span>;
} <span class="keyword">else</span> {
<span class="type"><a href="qgraphicsitem.html">QGraphicsItem</a></span><span class="operator">::</span>mousePressEvent(event);
}
}
<span class="type">void</span> ItemBase<span class="operator">::</span>mouseReleaseEvent(<span class="type"><a href="qgraphicsscenemouseevent.html">QGraphicsSceneMouseEvent</a></span> <span class="operator">*</span>event)
{
<span class="keyword">if</span> (event<span class="operator">-</span><span class="operator">></span>button() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>LeftButton <span class="operator">&</span><span class="operator">&</span> m_isResizing) {
m_isResizing <span class="operator">=</span> <span class="keyword">false</span>;
} <span class="keyword">else</span> {
<span class="type"><a href="qgraphicsitem.html">QGraphicsItem</a></span><span class="operator">::</span>mouseReleaseEvent(event);
}
}
<span class="type">void</span> ItemBase<span class="operator">::</span>keyPressEvent(<span class="type"><a href="qkeyevent.html">QKeyEvent</a></span> <span class="operator">*</span>event)
{
<span class="keyword">switch</span> (event<span class="operator">-</span><span class="operator">></span>key()) {
<span class="keyword">case</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>Key_Delete:
deleteSelectedItems(scene());
<span class="keyword">break</span>;
<span class="keyword">case</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>Key_Insert:
duplicateSelectedItems(scene());
<span class="keyword">break</span>;
<span class="keyword">case</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>Key_Plus:
growSelectedItems(scene());
<span class="keyword">break</span>;
<span class="keyword">case</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>Key_Minus:
shrinkSelectedItems(scene());
<span class="keyword">break</span>;
<span class="keyword">default</span>:
<span class="type"><a href="qgraphicsitem.html">QGraphicsItem</a></span><span class="operator">::</span>keyPressEvent(event);
<span class="keyword">break</span>;
}
}
<span class="type">void</span> ItemBase<span class="operator">::</span>wheelEvent(<span class="type"><a href="qgraphicsscenewheelevent.html">QGraphicsSceneWheelEvent</a></span> <span class="operator">*</span>event)
{
prepareGeometryChange();
m_size <span class="operator">=</span> <span class="type">int</span>(m_size <span class="operator">*</span> exp(<span class="operator">-</span>event<span class="operator">-</span><span class="operator">></span>delta() <span class="operator">/</span> <span class="number">600.0</span>));
<span class="keyword">if</span> (m_size <span class="operator">></span> MAX_ITEM_SIZE)
m_size <span class="operator">=</span> MAX_ITEM_SIZE;
<span class="keyword">else</span> <span class="keyword">if</span> (m_size <span class="operator"><</span> MIN_ITEM_SIZE)
m_size <span class="operator">=</span> MIN_ITEM_SIZE;
}
<span class="type">int</span> ItemBase<span class="operator">::</span>type() <span class="keyword">const</span>
{
<span class="keyword">return</span> Type;
}
<span class="type">bool</span> ItemBase<span class="operator">::</span>isInResizeArea(<span class="keyword">const</span> <span class="type"><a href="qpointf.html">QPointF</a></span> <span class="operator">&</span>pos)
{
<span class="keyword">return</span> (<span class="operator">-</span>pos<span class="operator">.</span>y() <span class="operator"><</span> pos<span class="operator">.</span>x() <span class="operator">-</span> m_size <span class="operator">+</span> <span class="number">9</span>);
}
<span class="comment">//============================================================================//</span>
<span class="comment">// QtBox //</span>
<span class="comment">//============================================================================//</span>
<span class="type">QtBox</span><span class="operator">::</span><span class="type">QtBox</span>(<span class="type">int</span> size<span class="operator">,</span> <span class="type">int</span> x<span class="operator">,</span> <span class="type">int</span> y) : ItemBase(size<span class="operator">,</span> x<span class="operator">,</span> y)<span class="operator">,</span> m_texture(<span class="number">0</span>)
{
<span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator"><</span> <span class="number">8</span>; <span class="operator">+</span><span class="operator">+</span>i) {
m_vertices<span class="operator">[</span>i<span class="operator">]</span><span class="operator">.</span>setX(i <span class="operator">&</span> <span class="number">1</span> <span class="operator">?</span> <span class="number">0.5f</span> : <span class="operator">-</span><span class="number">0.5f</span>);
m_vertices<span class="operator">[</span>i<span class="operator">]</span><span class="operator">.</span>setY(i <span class="operator">&</span> <span class="number">2</span> <span class="operator">?</span> <span class="number">0.5f</span> : <span class="operator">-</span><span class="number">0.5f</span>);
m_vertices<span class="operator">[</span>i<span class="operator">]</span><span class="operator">.</span>setZ(i <span class="operator">&</span> <span class="number">4</span> <span class="operator">?</span> <span class="number">0.5f</span> : <span class="operator">-</span><span class="number">0.5f</span>);
}
<span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator"><</span> <span class="number">4</span>; <span class="operator">+</span><span class="operator">+</span>i) {
m_texCoords<span class="operator">[</span>i<span class="operator">]</span><span class="operator">.</span>setX(i <span class="operator">&</span> <span class="number">1</span> <span class="operator">?</span> <span class="number">1.0f</span> : <span class="number">0.0f</span>);
m_texCoords<span class="operator">[</span>i<span class="operator">]</span><span class="operator">.</span>setY(i <span class="operator">&</span> <span class="number">2</span> <span class="operator">?</span> <span class="number">1.0f</span> : <span class="number">0.0f</span>);
}
m_normals<span class="operator">[</span><span class="number">0</span><span class="operator">]</span> <span class="operator">=</span> QVector3D(<span class="operator">-</span><span class="number">1.0f</span><span class="operator">,</span> <span class="number">0.0f</span><span class="operator">,</span> <span class="number">0.0f</span>);
m_normals<span class="operator">[</span><span class="number">1</span><span class="operator">]</span> <span class="operator">=</span> QVector3D(<span class="number">1.0f</span><span class="operator">,</span> <span class="number">0.0f</span><span class="operator">,</span> <span class="number">0.0f</span>);
m_normals<span class="operator">[</span><span class="number">2</span><span class="operator">]</span> <span class="operator">=</span> QVector3D(<span class="number">0.0f</span><span class="operator">,</span> <span class="operator">-</span><span class="number">1.0f</span><span class="operator">,</span> <span class="number">0.0f</span>);
m_normals<span class="operator">[</span><span class="number">3</span><span class="operator">]</span> <span class="operator">=</span> QVector3D(<span class="number">0.0f</span><span class="operator">,</span> <span class="number">1.0f</span><span class="operator">,</span> <span class="number">0.0f</span>);
m_normals<span class="operator">[</span><span class="number">4</span><span class="operator">]</span> <span class="operator">=</span> QVector3D(<span class="number">0.0f</span><span class="operator">,</span> <span class="number">0.0f</span><span class="operator">,</span> <span class="operator">-</span><span class="number">1.0f</span>);
m_normals<span class="operator">[</span><span class="number">5</span><span class="operator">]</span> <span class="operator">=</span> QVector3D(<span class="number">0.0f</span><span class="operator">,</span> <span class="number">0.0f</span><span class="operator">,</span> <span class="number">1.0f</span>);
}
<span class="type">QtBox</span><span class="operator">::</span><span class="operator">~</span><span class="type">QtBox</span>()
{
<span class="keyword">if</span> (m_texture)
<span class="keyword">delete</span> m_texture;
}
ItemBase <span class="operator">*</span><span class="type">QtBox</span><span class="operator">::</span>createNew(<span class="type">int</span> size<span class="operator">,</span> <span class="type">int</span> x<span class="operator">,</span> <span class="type">int</span> y)
{
<span class="keyword">return</span> <span class="keyword">new</span> <span class="type">QtBox</span>(size<span class="operator">,</span> x<span class="operator">,</span> y);
}
<span class="type">void</span> <span class="type">QtBox</span><span class="operator">::</span>paint(<span class="type"><a href="qpainter.html">QPainter</a></span> <span class="operator">*</span>painter<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="qstyleoptiongraphicsitem.html">QStyleOptionGraphicsItem</a></span> <span class="operator">*</span>option<span class="operator">,</span> <span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>widget)
{
<span class="type"><a href="qrectf.html">QRectF</a></span> rect <span class="operator">=</span> boundingRect()<span class="operator">.</span>translated(pos());
<span class="type">float</span> width <span class="operator">=</span> <span class="type">float</span>(painter<span class="operator">-</span><span class="operator">></span>device()<span class="operator">-</span><span class="operator">></span>width());
<span class="type">float</span> height <span class="operator">=</span> <span class="type">float</span>(painter<span class="operator">-</span><span class="operator">></span>device()<span class="operator">-</span><span class="operator">></span>height());
<span class="type">float</span> left <span class="operator">=</span> <span class="number">2.0f</span> <span class="operator">*</span> <span class="type">float</span>(rect<span class="operator">.</span>left()) <span class="operator">/</span> width <span class="operator">-</span> <span class="number">1.0f</span>;
<span class="type">float</span> right <span class="operator">=</span> <span class="number">2.0f</span> <span class="operator">*</span> <span class="type">float</span>(rect<span class="operator">.</span>right()) <span class="operator">/</span> width <span class="operator">-</span> <span class="number">1.0f</span>;
<span class="type">float</span> top <span class="operator">=</span> <span class="number">1.0f</span> <span class="operator">-</span> <span class="number">2.0f</span> <span class="operator">*</span> <span class="type">float</span>(rect<span class="operator">.</span>top()) <span class="operator">/</span> height;
<span class="type">float</span> bottom <span class="operator">=</span> <span class="number">1.0f</span> <span class="operator">-</span> <span class="number">2.0f</span> <span class="operator">*</span> <span class="type">float</span>(rect<span class="operator">.</span>bottom()) <span class="operator">/</span> height;
<span class="type">float</span> moveToRectMatrix<span class="operator">[</span><span class="operator">]</span> <span class="operator">=</span> {
<span class="number">0.5f</span> <span class="operator">*</span> (right <span class="operator">-</span> left)<span class="operator">,</span> <span class="number">0.0f</span><span class="operator">,</span> <span class="number">0.0f</span><span class="operator">,</span> <span class="number">0.0f</span><span class="operator">,</span>
<span class="number">0.0f</span><span class="operator">,</span> <span class="number">0.5f</span> <span class="operator">*</span> (bottom <span class="operator">-</span> top)<span class="operator">,</span> <span class="number">0.0f</span><span class="operator">,</span> <span class="number">0.0f</span><span class="operator">,</span>
<span class="number">0.0f</span><span class="operator">,</span> <span class="number">0.0f</span><span class="operator">,</span> <span class="number">1.0f</span><span class="operator">,</span> <span class="number">0.0f</span><span class="operator">,</span>
<span class="number">0.5f</span> <span class="operator">*</span> (right <span class="operator">+</span> left)<span class="operator">,</span> <span class="number">0.5f</span> <span class="operator">*</span> (bottom <span class="operator">+</span> top)<span class="operator">,</span> <span class="number">0.0f</span><span class="operator">,</span> <span class="number">1.0f</span>
};
painter<span class="operator">-</span><span class="operator">></span>beginNativePainting();
glMatrixMode(GL_PROJECTION);
glPushMatrix();
glLoadMatrixf(moveToRectMatrix);
qgluPerspective(<span class="number">60.0</span><span class="operator">,</span> <span class="number">1.0</span><span class="operator">,</span> <span class="number">0.01</span><span class="operator">,</span> <span class="number">10.0</span>);
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);
<span class="keyword">if</span>(m_texture <span class="operator">=</span><span class="operator">=</span> <span class="number">0</span>)
m_texture <span class="operator">=</span> <span class="keyword">new</span> GLTexture2D(<span class="string">":/res/boxes/qt-logo.jpg"</span><span class="operator">,</span> <span class="number">64</span><span class="operator">,</span> <span class="number">64</span>);
m_texture<span class="operator">-</span><span class="operator">></span>bind();
glEnable(GL_TEXTURE_2D);
glColorMaterial(GL_FRONT_AND_BACK<span class="operator">,</span> GL_AMBIENT_AND_DIFFUSE);
<span class="type">float</span> lightColour<span class="operator">[</span><span class="operator">]</span> <span class="operator">=</span> {<span class="number">1.0f</span><span class="operator">,</span> <span class="number">1.0f</span><span class="operator">,</span> <span class="number">1.0f</span><span class="operator">,</span> <span class="number">1.0f</span>};
<span class="type">float</span> lightDir<span class="operator">[</span><span class="operator">]</span> <span class="operator">=</span> {<span class="number">0.0f</span><span class="operator">,</span> <span class="number">0.0f</span><span class="operator">,</span> <span class="number">1.0f</span><span class="operator">,</span> <span class="number">0.0f</span>};
glLightfv(GL_LIGHT0<span class="operator">,</span> GL_DIFFUSE<span class="operator">,</span> lightColour);
glLightfv(GL_LIGHT0<span class="operator">,</span> GL_POSITION<span class="operator">,</span> lightDir);
glEnable(GL_LIGHT0);
glTranslatef(<span class="number">0.0f</span><span class="operator">,</span> <span class="number">0.0f</span><span class="operator">,</span> <span class="operator">-</span><span class="number">1.5f</span>);
glRotatef(ROTATE_SPEED_X <span class="operator">*</span> m_startTime<span class="operator">.</span>msecsTo(<span class="type"><a href="qtime.html">QTime</a></span><span class="operator">::</span>currentTime())<span class="operator">,</span> <span class="number">1.0f</span><span class="operator">,</span> <span class="number">0.0f</span><span class="operator">,</span> <span class="number">0.0f</span>);
glRotatef(ROTATE_SPEED_Y <span class="operator">*</span> m_startTime<span class="operator">.</span>msecsTo(<span class="type"><a href="qtime.html">QTime</a></span><span class="operator">::</span>currentTime())<span class="operator">,</span> <span class="number">0.0f</span><span class="operator">,</span> <span class="number">1.0f</span><span class="operator">,</span> <span class="number">0.0f</span>);
glRotatef(ROTATE_SPEED_Z <span class="operator">*</span> m_startTime<span class="operator">.</span>msecsTo(<span class="type"><a href="qtime.html">QTime</a></span><span class="operator">::</span>currentTime())<span class="operator">,</span> <span class="number">0.0f</span><span class="operator">,</span> <span class="number">0.0f</span><span class="operator">,</span> <span class="number">1.0f</span>);
<span class="type">int</span> dt <span class="operator">=</span> m_startTime<span class="operator">.</span>msecsTo(<span class="type"><a href="qtime.html">QTime</a></span><span class="operator">::</span>currentTime());
<span class="keyword">if</span> (dt <span class="operator"><</span> <span class="number">500</span>)
glScalef(dt <span class="operator">/</span> <span class="number">500.0f</span><span class="operator">,</span> dt <span class="operator">/</span> <span class="number">500.0f</span><span class="operator">,</span> dt <span class="operator">/</span> <span class="number">500.0f</span>);
<span class="keyword">for</span> (<span class="type">int</span> dir <span class="operator">=</span> <span class="number">0</span>; dir <span class="operator"><</span> <span class="number">3</span>; <span class="operator">+</span><span class="operator">+</span>dir) {
glColor4f(<span class="number">1.0f</span><span class="operator">,</span> <span class="number">1.0f</span><span class="operator">,</span> <span class="number">1.0f</span><span class="operator">,</span> <span class="number">1.0</span>);
glBegin(GL_TRIANGLE_STRIP);
glNormal3fv(<span class="keyword">reinterpret_cast</span><span class="operator"><</span><span class="type">float</span> <span class="operator">*</span><span class="operator">></span>(<span class="operator">&</span>m_normals<span class="operator">[</span><span class="number">2</span> <span class="operator">*</span> dir <span class="operator">+</span> <span class="number">0</span><span class="operator">]</span>));
<span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator"><</span> <span class="number">2</span>; <span class="operator">+</span><span class="operator">+</span>i) {
<span class="keyword">for</span> (<span class="type">int</span> j <span class="operator">=</span> <span class="number">0</span>; j <span class="operator"><</span> <span class="number">2</span>; <span class="operator">+</span><span class="operator">+</span>j) {
glTexCoord2fv(<span class="keyword">reinterpret_cast</span><span class="operator"><</span><span class="type">float</span> <span class="operator">*</span><span class="operator">></span>(<span class="operator">&</span>m_texCoords<span class="operator">[</span>(j <span class="operator"><</span><span class="operator"><</span> <span class="number">1</span>) <span class="operator">|</span> i<span class="operator">]</span>));
glVertex3fv(<span class="keyword">reinterpret_cast</span><span class="operator"><</span><span class="type">float</span> <span class="operator">*</span><span class="operator">></span>(<span class="operator">&</span>m_vertices<span class="operator">[</span>(i <span class="operator"><</span><span class="operator"><</span> ((dir <span class="operator">+</span> <span class="number">2</span>) <span class="operator">%</span> <span class="number">3</span>)) <span class="operator">|</span> (j <span class="operator"><</span><span class="operator"><</span> ((dir <span class="operator">+</span> <span class="number">1</span>) <span class="operator">%</span> <span class="number">3</span>))<span class="operator">]</span>));
}
}
glEnd();
glBegin(GL_TRIANGLE_STRIP);
glNormal3fv(<span class="keyword">reinterpret_cast</span><span class="operator"><</span><span class="type">float</span> <span class="operator">*</span><span class="operator">></span>(<span class="operator">&</span>m_normals<span class="operator">[</span><span class="number">2</span> <span class="operator">*</span> dir <span class="operator">+</span> <span class="number">1</span><span class="operator">]</span>));
<span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator"><</span> <span class="number">2</span>; <span class="operator">+</span><span class="operator">+</span>i) {
<span class="keyword">for</span> (<span class="type">int</span> j <span class="operator">=</span> <span class="number">0</span>; j <span class="operator"><</span> <span class="number">2</span>; <span class="operator">+</span><span class="operator">+</span>j) {
glTexCoord2fv(<span class="keyword">reinterpret_cast</span><span class="operator"><</span><span class="type">float</span> <span class="operator">*</span><span class="operator">></span>(<span class="operator">&</span>m_texCoords<span class="operator">[</span>(j <span class="operator"><</span><span class="operator"><</span> <span class="number">1</span>) <span class="operator">|</span> i<span class="operator">]</span>));
glVertex3fv(<span class="keyword">reinterpret_cast</span><span class="operator"><</span><span class="type">float</span> <span class="operator">*</span><span class="operator">></span>(<span class="operator">&</span>m_vertices<span class="operator">[</span>(<span class="number">1</span> <span class="operator"><</span><span class="operator"><</span> dir) <span class="operator">|</span> (i <span class="operator"><</span><span class="operator"><</span> ((dir <span class="operator">+</span> <span class="number">1</span>) <span class="operator">%</span> <span class="number">3</span>)) <span class="operator">|</span> (j <span class="operator"><</span><span class="operator"><</span> ((dir <span class="operator">+</span> <span class="number">2</span>) <span class="operator">%</span> <span class="number">3</span>))<span class="operator">]</span>));
}
}
glEnd();
}
m_texture<span class="operator">-</span><span class="operator">></span>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<span class="operator">-</span><span class="operator">></span>endNativePainting();
ItemBase<span class="operator">::</span>paint(painter<span class="operator">,</span> option<span class="operator">,</span> widget);
}
<span class="comment">//============================================================================//</span>
<span class="comment">// CircleItem //</span>
<span class="comment">//============================================================================//</span>
CircleItem<span class="operator">::</span>CircleItem(<span class="type">int</span> size<span class="operator">,</span> <span class="type">int</span> x<span class="operator">,</span> <span class="type">int</span> y) : ItemBase(size<span class="operator">,</span> x<span class="operator">,</span> y)
{
m_color <span class="operator">=</span> <span class="type"><a href="qcolor.html">QColor</a></span><span class="operator">::</span>fromHsv(rand() <span class="operator">%</span> <span class="number">360</span><span class="operator">,</span> <span class="number">255</span><span class="operator">,</span> <span class="number">255</span>);
}
<span class="type">void</span> CircleItem<span class="operator">::</span>paint(<span class="type"><a href="qpainter.html">QPainter</a></span> <span class="operator">*</span>painter<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="qstyleoptiongraphicsitem.html">QStyleOptionGraphicsItem</a></span> <span class="operator">*</span>option<span class="operator">,</span> <span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>widget)
{
<span class="type">int</span> dt <span class="operator">=</span> m_startTime<span class="operator">.</span>msecsTo(<span class="type"><a href="qtime.html">QTime</a></span><span class="operator">::</span>currentTime());
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> r0 <span class="operator">=</span> <span class="number">0.5</span> <span class="operator">*</span> m_size <span class="operator">*</span> (<span class="number">1.0</span> <span class="operator">-</span> exp(<span class="operator">-</span><span class="number">0.001</span> <span class="operator">*</span> ((dt <span class="operator">+</span> <span class="number">3800</span>) <span class="operator">%</span> <span class="number">4000</span>)));
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> r1 <span class="operator">=</span> <span class="number">0.5</span> <span class="operator">*</span> m_size <span class="operator">*</span> (<span class="number">1.0</span> <span class="operator">-</span> exp(<span class="operator">-</span><span class="number">0.001</span> <span class="operator">*</span> ((dt <span class="operator">+</span> <span class="number">0</span>) <span class="operator">%</span> <span class="number">4000</span>)));
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> r2 <span class="operator">=</span> <span class="number">0.5</span> <span class="operator">*</span> m_size <span class="operator">*</span> (<span class="number">1.0</span> <span class="operator">-</span> exp(<span class="operator">-</span><span class="number">0.001</span> <span class="operator">*</span> ((dt <span class="operator">+</span> <span class="number">1800</span>) <span class="operator">%</span> <span class="number">4000</span>)));
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> r3 <span class="operator">=</span> <span class="number">0.5</span> <span class="operator">*</span> m_size <span class="operator">*</span> (<span class="number">1.0</span> <span class="operator">-</span> exp(<span class="operator">-</span><span class="number">0.001</span> <span class="operator">*</span> ((dt <span class="operator">+</span> <span class="number">2000</span>) <span class="operator">%</span> <span class="number">4000</span>)));
<span class="keyword">if</span> (r0 <span class="operator">></span> r1)
r0 <span class="operator">=</span> <span class="number">0.0</span>;
<span class="keyword">if</span> (r2 <span class="operator">></span> r3)
r2 <span class="operator">=</span> <span class="number">0.0</span>;
<span class="type"><a href="qpainterpath.html">QPainterPath</a></span> path;
path<span class="operator">.</span>moveTo(r1<span class="operator">,</span> <span class="number">0.0</span>);
path<span class="operator">.</span>arcTo(<span class="operator">-</span>r1<span class="operator">,</span> <span class="operator">-</span>r1<span class="operator">,</span> <span class="number">2</span> <span class="operator">*</span> r1<span class="operator">,</span> <span class="number">2</span> <span class="operator">*</span> r1<span class="operator">,</span> <span class="number">0.0</span><span class="operator">,</span> <span class="number">360.0</span>);
path<span class="operator">.</span>lineTo(r0<span class="operator">,</span> <span class="number">0.0</span>);
path<span class="operator">.</span>arcTo(<span class="operator">-</span>r0<span class="operator">,</span> <span class="operator">-</span>r0<span class="operator">,</span> <span class="number">2</span> <span class="operator">*</span> r0<span class="operator">,</span> <span class="number">2</span> <span class="operator">*</span> r0<span class="operator">,</span> <span class="number">0.0</span><span class="operator">,</span> <span class="operator">-</span><span class="number">360.0</span>);
path<span class="operator">.</span>closeSubpath();
path<span class="operator">.</span>moveTo(r3<span class="operator">,</span> <span class="number">0.0</span>);
path<span class="operator">.</span>arcTo(<span class="operator">-</span>r3<span class="operator">,</span> <span class="operator">-</span>r3<span class="operator">,</span> <span class="number">2</span> <span class="operator">*</span> r3<span class="operator">,</span> <span class="number">2</span> <span class="operator">*</span> r3<span class="operator">,</span> <span class="number">0.0</span><span class="operator">,</span> <span class="number">360.0</span>);
path<span class="operator">.</span>lineTo(r0<span class="operator">,</span> <span class="number">0.0</span>);
path<span class="operator">.</span>arcTo(<span class="operator">-</span>r2<span class="operator">,</span> <span class="operator">-</span>r2<span class="operator">,</span> <span class="number">2</span> <span class="operator">*</span> r2<span class="operator">,</span> <span class="number">2</span> <span class="operator">*</span> r2<span class="operator">,</span> <span class="number">0.0</span><span class="operator">,</span> <span class="operator">-</span><span class="number">360.0</span>);
path<span class="operator">.</span>closeSubpath();
painter<span class="operator">-</span><span class="operator">></span>setRenderHint(<span class="type"><a href="qpainter.html">QPainter</a></span><span class="operator">::</span>Antialiasing<span class="operator">,</span> <span class="keyword">true</span>);
painter<span class="operator">-</span><span class="operator">></span>setBrush(<span class="type"><a href="qbrush.html">QBrush</a></span>(m_color));
painter<span class="operator">-</span><span class="operator">></span>setPen(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>NoPen);
painter<span class="operator">-</span><span class="operator">></span>drawPath(path);
painter<span class="operator">-</span><span class="operator">></span>setBrush(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>NoBrush);
painter<span class="operator">-</span><span class="operator">></span>setPen(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>SolidLine);
painter<span class="operator">-</span><span class="operator">></span>setRenderHint(<span class="type"><a href="qpainter.html">QPainter</a></span><span class="operator">::</span>Antialiasing<span class="operator">,</span> <span class="keyword">false</span>);
ItemBase<span class="operator">::</span>paint(painter<span class="operator">,</span> option<span class="operator">,</span> widget);
}
ItemBase <span class="operator">*</span>CircleItem<span class="operator">::</span>createNew(<span class="type">int</span> size<span class="operator">,</span> <span class="type">int</span> x<span class="operator">,</span> <span class="type">int</span> y)
{
<span class="keyword">return</span> <span class="keyword">new</span> CircleItem(size<span class="operator">,</span> x<span class="operator">,</span> y);
}
<span class="comment">//============================================================================//</span>
<span class="comment">// SquareItem //</span>
<span class="comment">//============================================================================//</span>
SquareItem<span class="operator">::</span>SquareItem(<span class="type">int</span> size<span class="operator">,</span> <span class="type">int</span> x<span class="operator">,</span> <span class="type">int</span> y) : ItemBase(size<span class="operator">,</span> x<span class="operator">,</span> y)
{
m_image <span class="operator">=</span> <span class="type"><a href="qpixmap.html">QPixmap</a></span>(<span class="string">":/res/boxes/square.jpg"</span>);
}
<span class="type">void</span> SquareItem<span class="operator">::</span>paint(<span class="type"><a href="qpainter.html">QPainter</a></span> <span class="operator">*</span>painter<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="qstyleoptiongraphicsitem.html">QStyleOptionGraphicsItem</a></span> <span class="operator">*</span>option<span class="operator">,</span> <span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>widget)
{
<span class="type">int</span> dt <span class="operator">=</span> m_startTime<span class="operator">.</span>msecsTo(<span class="type"><a href="qtime.html">QTime</a></span><span class="operator">::</span>currentTime());
<span class="type"><a href="qtransform.html">QTransform</a></span> oldTransform <span class="operator">=</span> painter<span class="operator">-</span><span class="operator">></span>worldTransform();
<span class="type">int</span> dtMod <span class="operator">=</span> dt <span class="operator">%</span> <span class="number">2000</span>;
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> amp <span class="operator">=</span> <span class="number">0.002</span> <span class="operator">*</span> (dtMod <span class="operator"><</span> <span class="number">1000</span> <span class="operator">?</span> dtMod : <span class="number">2000</span> <span class="operator">-</span> dtMod) <span class="operator">-</span> <span class="number">1.0</span>;
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> scale <span class="operator">=</span> <span class="number">0.6</span> <span class="operator">+</span> <span class="number">0.2</span> <span class="operator">*</span> amp <span class="operator">*</span> amp;
painter<span class="operator">-</span><span class="operator">></span>setWorldTransform(<span class="type"><a href="qtransform.html">QTransform</a></span>()<span class="operator">.</span>rotate(<span class="number">15.0</span> <span class="operator">*</span> amp)<span class="operator">.</span>scale(scale<span class="operator">,</span> scale)<span class="operator">,</span> <span class="keyword">true</span>);
painter<span class="operator">-</span><span class="operator">></span>drawPixmap(<span class="operator">-</span>m_size <span class="operator">/</span> <span class="number">2</span><span class="operator">,</span> <span class="operator">-</span>m_size <span class="operator">/</span> <span class="number">2</span><span class="operator">,</span> m_size<span class="operator">,</span> m_size<span class="operator">,</span> m_image);
painter<span class="operator">-</span><span class="operator">></span>setWorldTransform(oldTransform<span class="operator">,</span> <span class="keyword">false</span>);
ItemBase<span class="operator">::</span>paint(painter<span class="operator">,</span> option<span class="operator">,</span> widget);
}
ItemBase <span class="operator">*</span>SquareItem<span class="operator">::</span>createNew(<span class="type">int</span> size<span class="operator">,</span> <span class="type">int</span> x<span class="operator">,</span> <span class="type">int</span> y)
{
<span class="keyword">return</span> <span class="keyword">new</span> SquareItem(size<span class="operator">,</span> x<span class="operator">,</span> y);
}</pre>
</div>
<!-- @@@demos/boxes/qtbox.cpp -->
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