/****************************************************************************** $Id: qt/glbox.cpp   3.3.4   edited May 27 2003 $**** Copyright (C) 1992-2000 Trolltech AS.  All rights reserved.**** This file is part of an example program for Qt.  This example** program may be used, distributed and modified without limitation.*******************************************************************************//******************************************************************************** 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"#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, name ){    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( 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( 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();}