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143 lines
3.2 KiB
143 lines
3.2 KiB
/****************************************************************************
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**
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** Copyright (C) 1992-2008 Trolltech ASA. All rights reserved.
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**
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** This file is part of an example program for TQt. This example
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** program may be used, distributed and modified without limitation.
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**
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*****************************************************************************/
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/****************************************************************************
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**
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** This is a simple TQGLWidget displaying an openGL wireframe box
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**
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** The OpenGL code is mostly borrowed from Brian Pauls "spin" example
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** in the Mesa distribution
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**
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****************************************************************************/
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#include "glbox.h"
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#if defined(Q_CC_MSVC)
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#pragma warning(disable:4305) // init: truncation from const double to float
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#endif
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/*!
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Create a GLBox widget
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*/
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GLBox::GLBox( TQWidget* parent, const char* name, WFlags f )
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: GLControlWidget( parent, name, 0, f )
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{
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setAnimationDelay( -1 );
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xRot = yRot = zRot = 0.0; // default object rotation
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scale = 1.25; // default object scale
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object = 0;
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}
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/*!
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Release allocated resources
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*/
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GLBox::~GLBox()
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{
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makeCurrent();
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glDeleteLists( object, 1 );
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}
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/*!
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Paint the box. The actual openGL commands for drawing the box are
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performed here.
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*/
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void GLBox::paintGL()
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{
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glClear( GL_COLOR_BUFFER_BIT );
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glLoadIdentity();
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transform();
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glCallList( object );
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drawText();
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qglColor( green );
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glLineWidth( 1.0 );
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glBegin( GL_LINES );
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{
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glVertex3f( 0.0, 0.0, 0.0 );
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glVertex3f( 0.98, 0.98, 0.98 );
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}
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glEnd();
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renderText( 1.0, 1.0, 1.0, "Wirebox", TQFont( "helvetica", 12, TQFont::Bold, TRUE ) );
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}
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/*!
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Set up the OpenGL rendering state, and define display list
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*/
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void GLBox::initializeGL()
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{
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qglClearColor( black ); // Let OpenGL clear to black
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object = makeObject(); // Generate an OpenGL display list
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glShadeModel( GL_FLAT );
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}
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/*!
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Set up the OpenGL view port, matrix mode, etc.
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*/
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void GLBox::resizeGL( int w, int h )
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{
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glViewport( 0, 0, (GLint)w, (GLint)h );
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glMatrixMode( GL_PROJECTION );
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glLoadIdentity();
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glFrustum( -1.0, 1.0, -1.0, 1.0, 5.0, 15.0 );
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glMatrixMode( GL_MODELVIEW );
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}
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/*!
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Generate an OpenGL display list for the object to be shown, i.e. the box
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*/
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GLuint GLBox::makeObject()
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{
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GLuint list;
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list = glGenLists( 1 );
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glNewList( list, GL_COMPILE );
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qglColor( white ); // Shorthand for glColor3f or glIndex
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glLineWidth( 2.0 );
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glBegin( GL_LINE_LOOP );
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glVertex3f( 1.0, 0.5, -0.4 );
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glVertex3f( 1.0, -0.5, -0.4 );
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glVertex3f( -1.0, -0.5, -0.4 );
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glVertex3f( -1.0, 0.5, -0.4 );
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glEnd();
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glBegin( GL_LINE_LOOP );
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glVertex3f( 1.0, 0.5, 0.4 );
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glVertex3f( 1.0, -0.5, 0.4 );
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glVertex3f( -1.0, -0.5, 0.4 );
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glVertex3f( -1.0, 0.5, 0.4 );
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glEnd();
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glBegin( GL_LINES );
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glVertex3f( 1.0, 0.5, -0.4 ); glVertex3f( 1.0, 0.5, 0.4 );
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glVertex3f( 1.0, -0.5, -0.4 ); glVertex3f( 1.0, -0.5, 0.4 );
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glVertex3f( -1.0, -0.5, -0.4 ); glVertex3f( -1.0, -0.5, 0.4 );
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glVertex3f( -1.0, 0.5, -0.4 ); glVertex3f( -1.0, 0.5, 0.4 );
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glEnd();
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glEndList();
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return list;
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}
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