glbox.cpp Example File
activeqt/opengl/glbox.cpp
/****************************************************************************
**
** Copyright (C) 1992-2005 Trolltech AS. All rights reserved.
**
** This file is part of the documentation of the Qt Toolkit.
**
** This file may be used under the terms of the GNU General Public
** License version 2.0 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 GNU
** General Public Licensing requirements will be met:
** http://www.trolltech.com/products/qt/opensource.html
**
** If you are unsure which license is appropriate for your use, please
** review the following information:
** http://www.trolltech.com/products/qt/licensing.html or contact the
** sales department at sales@trolltech.com.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
****************************************************************************/
/****************************************************************************
**
** This is a simple QGLWidget displaying an openGL wireframe box
**
** The OpenGL code is mostly borrowed from Brian Pauls "spin" example
** in the Mesa distribution
**
****************************************************************************/
#include "glbox.h"
#include <QAxAggregated>
#include <QUuid>
#include <objsafe.h>
#if defined(Q_CC_MSVC)
#pragma warning(disable:4305) // init: truncation from const double to float
#endif
/*!
Create a GLBox widget
*/
GLBox::GLBox( QWidget* parent, const char* name )
: QGLWidget( parent )
{
xRot = yRot = zRot = 0.0; // default object rotation
scale = 1.25; // default object scale
object = 0;
}
/*!
Release allocated resources
*/
GLBox::~GLBox()
{
makeCurrent();
glDeleteLists( object, 1 );
}
/*!
Paint the box. The actual openGL commands for drawing the box are
performed here.
*/
void GLBox::paintGL()
{
glClear( GL_COLOR_BUFFER_BIT );
glLoadIdentity();
glTranslatef( 0.0, 0.0, -10.0 );
glScalef( scale, scale, scale );
glRotatef( xRot, 1.0, 0.0, 0.0 );
glRotatef( yRot, 0.0, 1.0, 0.0 );
glRotatef( zRot, 0.0, 0.0, 1.0 );
glCallList( object );
}
/*!
Set up the OpenGL rendering state, and define display list
*/
void GLBox::initializeGL()
{
qglClearColor(Qt::black); // Let OpenGL clear to black
object = makeObject(); // Generate an OpenGL display list
glShadeModel( GL_FLAT );
}
/*!
Set up the OpenGL view port, matrix mode, etc.
*/
void GLBox::resizeGL( int w, int h )
{
glViewport( 0, 0, (GLint)w, (GLint)h );
glMatrixMode( GL_PROJECTION );
glLoadIdentity();
glFrustum( -1.0, 1.0, -1.0, 1.0, 5.0, 15.0 );
glMatrixMode( GL_MODELVIEW );
}
/*!
Generate an OpenGL display list for the object to be shown, i.e. the box
*/
GLuint GLBox::makeObject()
{
GLuint list;
list = glGenLists( 1 );
glNewList( list, GL_COMPILE );
qglColor(Qt::white); // Shorthand for glColor3f or glIndex
glLineWidth( 2.0 );
glBegin( GL_LINE_LOOP );
glVertex3f( 1.0, 0.5, -0.4 );
glVertex3f( 1.0, -0.5, -0.4 );
glVertex3f( -1.0, -0.5, -0.4 );
glVertex3f( -1.0, 0.5, -0.4 );
glEnd();
glBegin( GL_LINE_LOOP );
glVertex3f( 1.0, 0.5, 0.4 );
glVertex3f( 1.0, -0.5, 0.4 );
glVertex3f( -1.0, -0.5, 0.4 );
glVertex3f( -1.0, 0.5, 0.4 );
glEnd();
glBegin( GL_LINES );
glVertex3f( 1.0, 0.5, -0.4 ); glVertex3f( 1.0, 0.5, 0.4 );
glVertex3f( 1.0, -0.5, -0.4 ); glVertex3f( 1.0, -0.5, 0.4 );
glVertex3f( -1.0, -0.5, -0.4 ); glVertex3f( -1.0, -0.5, 0.4 );
glVertex3f( -1.0, 0.5, -0.4 ); glVertex3f( -1.0, 0.5, 0.4 );
glEnd();
glEndList();
return list;
}
/*!
Set the rotation angle of the object to \e degrees around the X axis.
*/
void GLBox::setXRotation( int degrees )
{
xRot = (GLfloat)(degrees % 360);
updateGL();
}
/*!
Set the rotation angle of the object to \e degrees around the Y axis.
*/
void GLBox::setYRotation( int degrees )
{
yRot = (GLfloat)(degrees % 360);
updateGL();
}
/*!
Set the rotation angle of the object to \e degrees around the Z axis.
*/
void GLBox::setZRotation( int degrees )
{
zRot = (GLfloat)(degrees % 360);
updateGL();
}
class ObjectSafetyImpl : public QAxAggregated,
public IObjectSafety
{
public:
ObjectSafetyImpl() {}
long queryInterface( const QUuid &iid, void **iface )
{
*iface = 0;
if ( iid == IID_IObjectSafety )
*iface = (IObjectSafety*)this;
else
return E_NOINTERFACE;
AddRef();
return S_OK;
}
QAXAGG_IUNKNOWN;
HRESULT WINAPI GetInterfaceSafetyOptions( REFIID riid, DWORD *pdwSupportedOptions, DWORD *pdwEnabledOptions )
{
*pdwSupportedOptions = INTERFACESAFE_FOR_UNTRUSTED_DATA | INTERFACESAFE_FOR_UNTRUSTED_CALLER;
*pdwEnabledOptions = INTERFACESAFE_FOR_UNTRUSTED_DATA | INTERFACESAFE_FOR_UNTRUSTED_CALLER;
return S_OK;
}
HRESULT WINAPI SetInterfaceSafetyOptions( REFIID riid, DWORD pdwSupportedOptions, DWORD pdwEnabledOptions )
{
return S_OK;
}
};
QAxAggregated *GLBox::createAggregate()
{
return new ObjectSafetyImpl();
}
