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<h1 class="title">glwidget.cpp Example File</h1>
<span class="small-subtitle">opengl/pbuffers2/glwidget.cpp</span>
<!-- $$$opengl/pbuffers2/glwidget.cpp-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp"> <span class="comment">/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** 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 Digia Plc and its Subsidiary(-ies) 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."
**
** $QT_END_LICENSE$
**
****************************************************************************/</span>
<span class="preprocessor">#include <QtGui/QImage></span>
<span class="preprocessor">#include "glwidget.h"</span>
<span class="preprocessor">#include <math.h></span>
<span class="preprocessor">#ifndef GL_MULTISAMPLE</span>
<span class="preprocessor">#define GL_MULTISAMPLE 0x809D</span>
<span class="preprocessor">#endif</span>
GLWidget<span class="operator">::</span>GLWidget(<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent)
: <span class="type"><a href="qglwidget.html">QGLWidget</a></span>(<span class="type"><a href="qglformat.html">QGLFormat</a></span>(QGL<span class="operator">::</span>SampleBuffers)<span class="operator">,</span> parent)
{
setWindowTitle(tr(<span class="string">"OpenGL pbuffers 2"</span>));
pbuffer <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qglpixelbuffer.html">QGLPixelBuffer</a></span>(<span class="number">1024</span><span class="operator">,</span> <span class="number">1024</span><span class="operator">,</span> format()<span class="operator">,</span> <span class="keyword">this</span>);
rot_x <span class="operator">=</span> rot_y <span class="operator">=</span> rot_z <span class="operator">=</span> <span class="number">0.0f</span>;
scale <span class="operator">=</span> <span class="number">0.1f</span>;
anim <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qtimeline.html">QTimeLine</a></span>(<span class="number">750</span><span class="operator">,</span> <span class="keyword">this</span>);
anim<span class="operator">-</span><span class="operator">></span>setUpdateInterval(<span class="number">20</span>);
connect(anim<span class="operator">,</span> SIGNAL(valueChanged(<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span>))<span class="operator">,</span> SLOT(animate(<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span>)));
connect(anim<span class="operator">,</span> SIGNAL(finished())<span class="operator">,</span> SLOT(animFinished()));
svg_renderer <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qsvgrenderer.html">QSvgRenderer</a></span>(QLatin1String(<span class="string">":/res/bubbles.svg"</span>)<span class="operator">,</span> <span class="keyword">this</span>);
connect(svg_renderer<span class="operator">,</span> SIGNAL(repaintNeeded())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(draw()));
logo <span class="operator">=</span> <span class="type"><a href="qimage.html">QImage</a></span>(<span class="string">":/res/designer.png"</span>);
logo <span class="operator">=</span> logo<span class="operator">.</span>convertToFormat(<span class="type"><a href="qimage.html">QImage</a></span><span class="operator">::</span>Format_ARGB32);
makeCurrent(); <span class="comment">// need a current context to create the display list</span>
tile_list <span class="operator">=</span> glGenLists(<span class="number">1</span>);
glNewList(tile_list<span class="operator">,</span> GL_COMPILE);
glBegin(GL_QUADS);
{
glTexCoord2f(<span class="number">0.0f</span><span class="operator">,</span> <span class="number">0.0f</span>); glVertex3f(<span class="operator">-</span><span class="number">1.0f</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>);
glTexCoord2f(<span class="number">1.0f</span><span class="operator">,</span> <span class="number">0.0f</span>); glVertex3f( <span class="number">1.0f</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>);
glTexCoord2f(<span class="number">1.0f</span><span class="operator">,</span> <span class="number">1.0f</span>); glVertex3f( <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>);
glTexCoord2f(<span class="number">0.0f</span><span class="operator">,</span> <span class="number">1.0f</span>); glVertex3f(<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>);
glTexCoord2f(<span class="number">1.0f</span><span class="operator">,</span> <span class="number">0.0f</span>); glVertex3f(<span class="operator">-</span><span class="number">1.0f</span><span class="operator">,</span> <span class="operator">-</span><span class="number">1.0f</span><span class="operator">,</span> <span class="operator">-</span><span class="number">1.0f</span>);
glTexCoord2f(<span class="number">1.0f</span><span class="operator">,</span> <span class="number">1.0f</span>); glVertex3f(<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="operator">-</span><span class="number">1.0f</span>);
glTexCoord2f(<span class="number">0.0f</span><span class="operator">,</span> <span class="number">1.0f</span>); glVertex3f( <span class="number">1.0f</span><span class="operator">,</span> <span class="number">1.0f</span><span class="operator">,</span> <span class="operator">-</span><span class="number">1.0f</span>);
glTexCoord2f(<span class="number">0.0f</span><span class="operator">,</span> <span class="number">0.0f</span>); glVertex3f( <span class="number">1.0f</span><span class="operator">,</span> <span class="operator">-</span><span class="number">1.0f</span><span class="operator">,</span> <span class="operator">-</span><span class="number">1.0f</span>);
glTexCoord2f(<span class="number">0.0f</span><span class="operator">,</span> <span class="number">1.0f</span>); glVertex3f(<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="operator">-</span><span class="number">1.0f</span>);
glTexCoord2f(<span class="number">0.0f</span><span class="operator">,</span> <span class="number">0.0f</span>); glVertex3f(<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>);
glTexCoord2f(<span class="number">1.0f</span><span class="operator">,</span> <span class="number">0.0f</span>); glVertex3f( <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>);
glTexCoord2f(<span class="number">1.0f</span><span class="operator">,</span> <span class="number">1.0f</span>); glVertex3f( <span class="number">1.0f</span><span class="operator">,</span> <span class="number">1.0f</span><span class="operator">,</span> <span class="operator">-</span><span class="number">1.0f</span>);
glTexCoord2f(<span class="number">1.0f</span><span class="operator">,</span> <span class="number">1.0f</span>); glVertex3f(<span class="operator">-</span><span class="number">1.0f</span><span class="operator">,</span> <span class="operator">-</span><span class="number">1.0f</span><span class="operator">,</span> <span class="operator">-</span><span class="number">1.0f</span>);
glTexCoord2f(<span class="number">0.0f</span><span class="operator">,</span> <span class="number">1.0f</span>); glVertex3f( <span class="number">1.0f</span><span class="operator">,</span> <span class="operator">-</span><span class="number">1.0f</span><span class="operator">,</span> <span class="operator">-</span><span class="number">1.0f</span>);
glTexCoord2f(<span class="number">0.0f</span><span class="operator">,</span> <span class="number">0.0f</span>); glVertex3f( <span class="number">1.0f</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>);
glTexCoord2f(<span class="number">1.0f</span><span class="operator">,</span> <span class="number">0.0f</span>); glVertex3f(<span class="operator">-</span><span class="number">1.0f</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>);
glTexCoord2f(<span class="number">1.0f</span><span class="operator">,</span> <span class="number">0.0f</span>); glVertex3f( <span class="number">1.0f</span><span class="operator">,</span> <span class="operator">-</span><span class="number">1.0f</span><span class="operator">,</span> <span class="operator">-</span><span class="number">1.0f</span>);
glTexCoord2f(<span class="number">1.0f</span><span class="operator">,</span> <span class="number">1.0f</span>); glVertex3f( <span class="number">1.0f</span><span class="operator">,</span> <span class="number">1.0f</span><span class="operator">,</span> <span class="operator">-</span><span class="number">1.0f</span>);
glTexCoord2f(<span class="number">0.0f</span><span class="operator">,</span> <span class="number">1.0f</span>); glVertex3f( <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>);
glTexCoord2f(<span class="number">0.0f</span><span class="operator">,</span> <span class="number">0.0f</span>); glVertex3f( <span class="number">1.0f</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>);
glTexCoord2f(<span class="number">0.0f</span><span class="operator">,</span> <span class="number">0.0f</span>); glVertex3f(<span class="operator">-</span><span class="number">1.0f</span><span class="operator">,</span> <span class="operator">-</span><span class="number">1.0f</span><span class="operator">,</span> <span class="operator">-</span><span class="number">1.0f</span>);
glTexCoord2f(<span class="number">1.0f</span><span class="operator">,</span> <span class="number">0.0f</span>); glVertex3f(<span class="operator">-</span><span class="number">1.0f</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>);
glTexCoord2f(<span class="number">1.0f</span><span class="operator">,</span> <span class="number">1.0f</span>); glVertex3f(<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>);
glTexCoord2f(<span class="number">0.0f</span><span class="operator">,</span> <span class="number">1.0f</span>); glVertex3f(<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="operator">-</span><span class="number">1.0f</span>);
}
glEnd();
glEndList();
wave <span class="operator">=</span> <span class="keyword">new</span> GLfloat<span class="operator">[</span>logo<span class="operator">.</span>width()<span class="operator">*</span>logo<span class="operator">.</span>height()<span class="operator">]</span>;
memset(wave<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> logo<span class="operator">.</span>width()<span class="operator">*</span>logo<span class="operator">.</span>height());
startTimer(<span class="number">30</span>); <span class="comment">// wave timer</span>
pbuffer<span class="operator">-</span><span class="operator">></span>makeCurrent();
dynamicTexture <span class="operator">=</span> pbuffer<span class="operator">-</span><span class="operator">></span>generateDynamicTexture();
<span class="comment">// bind the dynamic texture to the pbuffer - this is a no-op under X11</span>
hasDynamicTextureUpdate <span class="operator">=</span> pbuffer<span class="operator">-</span><span class="operator">></span>bindToDynamicTexture(dynamicTexture);
}
GLWidget<span class="operator">::</span><span class="operator">~</span>GLWidget()
{
<span class="keyword">delete</span><span class="operator">[</span><span class="operator">]</span> wave;
glDeleteLists(tile_list<span class="operator">,</span> <span class="number">1</span>);
pbuffer<span class="operator">-</span><span class="operator">></span>releaseFromDynamicTexture();
glDeleteTextures(<span class="number">1</span><span class="operator">,</span> <span class="operator">&</span>dynamicTexture);
<span class="keyword">delete</span> pbuffer;
}
<span class="type">void</span> GLWidget<span class="operator">::</span>paintEvent(<span class="type"><a href="qpaintevent.html">QPaintEvent</a></span> <span class="operator">*</span>)
{
draw();
}
<span class="type">void</span> GLWidget<span class="operator">::</span>draw()
{
<span class="type"><a href="qpainter.html">QPainter</a></span> p(<span class="keyword">this</span>); <span class="comment">// used for text overlay</span>
<span class="comment">// save the GL state set for QPainter</span>
p<span class="operator">.</span>beginNativePainting();
saveGLState();
<span class="comment">// render the 'bubbles.svg' file into our pbuffer</span>
<span class="type"><a href="qpainter.html">QPainter</a></span> pbuffer_painter(pbuffer);
svg_renderer<span class="operator">-</span><span class="operator">></span>render(<span class="operator">&</span>pbuffer_painter);
pbuffer_painter<span class="operator">.</span>end();
glFlush();
<span class="comment">// rendering directly to a texture is not supported on X11 and</span>
<span class="comment">// some Windows implementations, unfortunately</span>
<span class="keyword">if</span> (<span class="operator">!</span>hasDynamicTextureUpdate)
pbuffer<span class="operator">-</span><span class="operator">></span>updateDynamicTexture(dynamicTexture);
makeCurrent();
<span class="comment">// draw into the GL widget</span>
glClear(GL_COLOR_BUFFER_BIT <span class="operator">|</span> GL_DEPTH_BUFFER_BIT);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glFrustum(<span class="operator">-</span><span class="number">1</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="operator">-</span><span class="number">1</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">10</span><span class="operator">,</span> <span class="number">100</span>);
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">15.0f</span>);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glViewport(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> width()<span class="operator">,</span> height());
glBindTexture(GL_TEXTURE_2D<span class="operator">,</span> dynamicTexture);
glEnable(GL_TEXTURE_2D);
glEnable(GL_MULTISAMPLE);
glEnable(GL_CULL_FACE);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA<span class="operator">,</span> GL_ONE_MINUS_SRC_ALPHA);
<span class="comment">// draw background</span>
glPushMatrix();
glScalef(<span class="number">1.7f</span><span class="operator">,</span> <span class="number">1.7f</span><span class="operator">,</span> <span class="number">1.7f</span>);
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">1.0f</span>);
glCallList(tile_list);
glPopMatrix();
<span class="keyword">const</span> <span class="type">int</span> w <span class="operator">=</span> logo<span class="operator">.</span>width();
<span class="keyword">const</span> <span class="type">int</span> h <span class="operator">=</span> logo<span class="operator">.</span>height();
glRotatef(rot_x<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(rot_y<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(rot_z<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>);
glScalef(scale<span class="operator">/</span>w<span class="operator">,</span> scale<span class="operator">/</span>w<span class="operator">,</span> scale<span class="operator">/</span>w);
glDepthFunc(GL_LESS);
glEnable(GL_DEPTH_TEST);
<span class="comment">// draw the Qt icon</span>
glTranslatef(<span class="operator">-</span>w<span class="operator">+</span><span class="number">1</span><span class="operator">,</span> <span class="operator">-</span>h<span class="operator">+</span><span class="number">1</span><span class="operator">,</span> <span class="number">0.0f</span>);
<span class="keyword">for</span> (<span class="type">int</span> y<span class="operator">=</span>h<span class="operator">-</span><span class="number">1</span>; y<span class="operator">></span><span class="operator">=</span><span class="number">0</span>; <span class="operator">-</span><span class="operator">-</span>y) {
<span class="type"><a href="qtglobal.html#uint-typedef">uint</a></span> <span class="operator">*</span>p <span class="operator">=</span> (<span class="type"><a href="qtglobal.html#uint-typedef">uint</a></span><span class="operator">*</span>) logo<span class="operator">.</span>scanLine(y);
<span class="type"><a href="qtglobal.html#uint-typedef">uint</a></span> <span class="operator">*</span>end <span class="operator">=</span> p <span class="operator">+</span> w;
<span class="type">int</span> x <span class="operator">=</span> <span class="number">0</span>;
<span class="keyword">while</span> (p <span class="operator"><</span> end) {
glColor4ub(<a href="qcolor.html#qRed">qRed</a>(<span class="operator">*</span>p)<span class="operator">,</span> <a href="qcolor.html#qGreen">qGreen</a>(<span class="operator">*</span>p)<span class="operator">,</span> <a href="qcolor.html#qBlue">qBlue</a>(<span class="operator">*</span>p)<span class="operator">,</span> <span class="type"><a href="qtglobal.html#uchar-typedef">uchar</a></span>(<a href="qcolor.html#qAlpha">qAlpha</a>(<span class="operator">*</span>p)<span class="operator">*</span><span class="operator">.</span><span class="number">9</span>));
glTranslatef(<span class="number">0.0f</span><span class="operator">,</span> <span class="number">0.0f</span><span class="operator">,</span> wave<span class="operator">[</span>y<span class="operator">*</span>w<span class="operator">+</span>x<span class="operator">]</span>);
<span class="keyword">if</span> (<a href="qcolor.html#qAlpha">qAlpha</a>(<span class="operator">*</span>p) <span class="operator">></span> <span class="number">128</span>)
glCallList(tile_list);
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>wave<span class="operator">[</span>y<span class="operator">*</span>w<span class="operator">+</span>x<span class="operator">]</span>);
glTranslatef(<span class="number">2.0f</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="operator">+</span>x;
<span class="operator">+</span><span class="operator">+</span>p;
}
glTranslatef(<span class="operator">-</span>w<span class="operator">*</span><span class="number">2.0f</span><span class="operator">,</span> <span class="number">2.0f</span><span class="operator">,</span> <span class="number">0.0f</span>);
}
<span class="comment">// restore the GL state that QPainter expects</span>
restoreGLState();
p<span class="operator">.</span>endNativePainting();
<span class="comment">// draw the overlayed text using QPainter</span>
p<span class="operator">.</span>setPen(<span class="type"><a href="qcolor.html">QColor</a></span>(<span class="number">197</span><span class="operator">,</span> <span class="number">197</span><span class="operator">,</span> <span class="number">197</span><span class="operator">,</span> <span class="number">157</span>));
p<span class="operator">.</span>setBrush(<span class="type"><a href="qcolor.html">QColor</a></span>(<span class="number">197</span><span class="operator">,</span> <span class="number">197</span><span class="operator">,</span> <span class="number">197</span><span class="operator">,</span> <span class="number">127</span>));
p<span class="operator">.</span>drawRect(<span class="type"><a href="qrect.html">QRect</a></span>(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> width()<span class="operator">,</span> <span class="number">50</span>));
p<span class="operator">.</span>setPen(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>black);
p<span class="operator">.</span>setBrush(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>NoBrush);
<span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> str1(tr(<span class="string">"A simple OpenGL pbuffer example."</span>));
<span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> str2(tr(<span class="string">"Use the mouse wheel to zoom, press buttons and move mouse to rotate, double-click to flip."</span>));
<span class="type"><a href="qfontmetrics.html">QFontMetrics</a></span> fm(p<span class="operator">.</span>font());
p<span class="operator">.</span>drawText(width()<span class="operator">/</span><span class="number">2</span> <span class="operator">-</span> fm<span class="operator">.</span>width(str1)<span class="operator">/</span><span class="number">2</span><span class="operator">,</span> <span class="number">20</span><span class="operator">,</span> str1);
p<span class="operator">.</span>drawText(width()<span class="operator">/</span><span class="number">2</span> <span class="operator">-</span> fm<span class="operator">.</span>width(str2)<span class="operator">/</span><span class="number">2</span><span class="operator">,</span> <span class="number">20</span> <span class="operator">+</span> fm<span class="operator">.</span>lineSpacing()<span class="operator">,</span> str2);
}
<span class="type">void</span> GLWidget<span class="operator">::</span>mousePressEvent(<span class="type"><a href="qmouseevent.html">QMouseEvent</a></span> <span class="operator">*</span>e)
{
anchor <span class="operator">=</span> e<span class="operator">-</span><span class="operator">></span>pos();
}
<span class="type">void</span> GLWidget<span class="operator">::</span>mouseMoveEvent(<span class="type"><a href="qmouseevent.html">QMouseEvent</a></span> <span class="operator">*</span>e)
{
<span class="type"><a href="qpoint.html">QPoint</a></span> diff <span class="operator">=</span> e<span class="operator">-</span><span class="operator">></span>pos() <span class="operator">-</span> anchor;
<span class="keyword">if</span> (e<span class="operator">-</span><span class="operator">></span>buttons() <span class="operator">&</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>LeftButton) {
rot_x <span class="operator">+</span><span class="operator">=</span> diff<span class="operator">.</span>y()<span class="operator">/</span><span class="number">5.0f</span>;
rot_y <span class="operator">+</span><span class="operator">=</span> diff<span class="operator">.</span>x()<span class="operator">/</span><span class="number">5.0f</span>;
} <span class="keyword">else</span> <span class="keyword">if</span> (e<span class="operator">-</span><span class="operator">></span>buttons() <span class="operator">&</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>RightButton) {
rot_z <span class="operator">+</span><span class="operator">=</span> diff<span class="operator">.</span>x()<span class="operator">/</span><span class="number">5.0f</span>;
}
anchor <span class="operator">=</span> e<span class="operator">-</span><span class="operator">></span>pos();
draw();
}
<span class="type">void</span> GLWidget<span class="operator">::</span>wheelEvent(<span class="type"><a href="qwheelevent.html">QWheelEvent</a></span> <span class="operator">*</span>e)
{
e<span class="operator">-</span><span class="operator">></span>delta() <span class="operator">></span> <span class="number">0</span> <span class="operator">?</span> scale <span class="operator">+</span><span class="operator">=</span> scale<span class="operator">*</span><span class="number">0.1f</span> : scale <span class="operator">-</span><span class="operator">=</span> scale<span class="operator">*</span><span class="number">0.1f</span>;
draw();
}
<span class="type">void</span> GLWidget<span class="operator">::</span>mouseDoubleClickEvent(<span class="type"><a href="qmouseevent.html">QMouseEvent</a></span> <span class="operator">*</span>)
{
anim<span class="operator">-</span><span class="operator">></span>start();
}
<span class="type">void</span> GLWidget<span class="operator">::</span>animate(<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> val)
{
rot_y <span class="operator">=</span> val <span class="operator">*</span> <span class="number">180</span>;
draw();
}
<span class="type">void</span> GLWidget<span class="operator">::</span>animFinished()
{
<span class="keyword">if</span> (anim<span class="operator">-</span><span class="operator">></span>direction() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qtimeline.html">QTimeLine</a></span><span class="operator">::</span>Forward)
anim<span class="operator">-</span><span class="operator">></span>setDirection(<span class="type"><a href="qtimeline.html">QTimeLine</a></span><span class="operator">::</span>Backward);
<span class="keyword">else</span>
anim<span class="operator">-</span><span class="operator">></span>setDirection(<span class="type"><a href="qtimeline.html">QTimeLine</a></span><span class="operator">::</span>Forward);
}
<span class="type">void</span> GLWidget<span class="operator">::</span>saveGLState()
{
glPushAttrib(GL_ALL_ATTRIB_BITS);
glMatrixMode(GL_PROJECTION);
glPushMatrix();
glMatrixMode(GL_MODELVIEW);
glPushMatrix();
}
<span class="type">void</span> GLWidget<span class="operator">::</span>restoreGLState()
{
glMatrixMode(GL_PROJECTION);
glPopMatrix();
glMatrixMode(GL_MODELVIEW);
glPopMatrix();
glPopAttrib();
}
<span class="preprocessor">#define PI 3.14159</span>
<span class="type">void</span> GLWidget<span class="operator">::</span>timerEvent(<span class="type"><a href="qtimerevent.html">QTimerEvent</a></span> <span class="operator">*</span>)
{
<span class="keyword">if</span> (<span class="type"><a href="qapplication.html">QApplication</a></span><span class="operator">::</span>mouseButtons() <span class="operator">!</span><span class="operator">=</span> <span class="number">0</span>)
<span class="keyword">return</span>;
<span class="keyword">static</span> <span class="type">bool</span> scale_in <span class="operator">=</span> <span class="keyword">true</span>;
<span class="keyword">if</span> (scale_in <span class="operator">&</span><span class="operator">&</span> scale <span class="operator">></span> <span class="number">35.0f</span>)
scale_in <span class="operator">=</span> <span class="keyword">false</span>;
<span class="keyword">else</span> <span class="keyword">if</span> (<span class="operator">!</span>scale_in <span class="operator">&</span><span class="operator">&</span> scale <span class="operator"><</span> <span class="operator">.</span><span class="number">5f</span>)
scale_in <span class="operator">=</span> <span class="keyword">true</span>;
scale <span class="operator">=</span> scale_in <span class="operator">?</span> scale <span class="operator">+</span> scale<span class="operator">*</span><span class="number">0.01f</span> : scale<span class="operator">-</span>scale<span class="operator">*</span><span class="number">0.01f</span>;
rot_z <span class="operator">+</span><span class="operator">=</span> <span class="number">0.3f</span>;
rot_x <span class="operator">+</span><span class="operator">=</span> <span class="number">0.1f</span>;
<span class="type">int</span> dx<span class="operator">,</span> dy; <span class="comment">// disturbance point</span>
<span class="type">float</span> s<span class="operator">,</span> v<span class="operator">,</span> W<span class="operator">,</span> t;
<span class="type">int</span> i<span class="operator">,</span> j;
<span class="keyword">static</span> <span class="type">float</span> wt<span class="operator">[</span><span class="number">128</span><span class="operator">]</span><span class="operator">[</span><span class="number">128</span><span class="operator">]</span>;
<span class="keyword">const</span> <span class="type">int</span> width <span class="operator">=</span> logo<span class="operator">.</span>width();
<span class="keyword">const</span> <span class="type">int</span> AMP <span class="operator">=</span> <span class="number">5</span>;
dx <span class="operator">=</span> dy <span class="operator">=</span> width <span class="operator">></span><span class="operator">></span> <span class="number">1</span>;
W <span class="operator">=</span> <span class="operator">.</span><span class="number">3f</span>;
v <span class="operator">=</span> <span class="operator">-</span><span class="number">4</span>; <span class="comment">// wave speed</span>
<span class="keyword">for</span> (i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator"><</span> width; <span class="operator">+</span><span class="operator">+</span>i) {
<span class="keyword">for</span> ( j <span class="operator">=</span> <span class="number">0</span>; j <span class="operator"><</span> width; <span class="operator">+</span><span class="operator">+</span>j) {
s <span class="operator">=</span> sqrt((<span class="type">double</span>) ((j <span class="operator">-</span> dx) <span class="operator">*</span> (j <span class="operator">-</span> dx) <span class="operator">+</span> (i <span class="operator">-</span> dy) <span class="operator">*</span> (i <span class="operator">-</span> dy)));
wt<span class="operator">[</span>i<span class="operator">]</span><span class="operator">[</span>j<span class="operator">]</span> <span class="operator">+</span><span class="operator">=</span> <span class="number">0.1f</span>;
t <span class="operator">=</span> s <span class="operator">/</span> v;
<span class="keyword">if</span> (s <span class="operator">!</span><span class="operator">=</span> <span class="number">0</span>)
wave<span class="operator">[</span>i<span class="operator">*</span>width <span class="operator">+</span> j<span class="operator">]</span> <span class="operator">=</span> AMP <span class="operator">*</span> sin(<span class="number">2</span> <span class="operator">*</span> PI <span class="operator">*</span> W <span class="operator">*</span> (wt<span class="operator">[</span>i<span class="operator">]</span><span class="operator">[</span>j<span class="operator">]</span> <span class="operator">+</span> t)) <span class="operator">/</span> (<span class="number">0.2</span><span class="operator">*</span>(s <span class="operator">+</span> <span class="number">2</span>));
<span class="keyword">else</span>
wave<span class="operator">[</span>i<span class="operator">*</span>width <span class="operator">+</span> j<span class="operator">]</span> <span class="operator">=</span> AMP <span class="operator">*</span> sin(<span class="number">2</span> <span class="operator">*</span> PI <span class="operator">*</span> W <span class="operator">*</span> (wt<span class="operator">[</span>i<span class="operator">]</span><span class="operator">[</span>j<span class="operator">]</span> <span class="operator">+</span> t));
}
}
}</pre>
</div>
<!-- @@@opengl/pbuffers2/glwidget.cpp -->
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