tqt3/tools/designer/examples/opengl/glwidget.cpp

/**********************************************************************
**
** Copyright (C) 2000-2008 Trolltech ASA.  All rights reserved.
**
** This file is part of TQt Designer.
**
** This file may be used under the terms of the GNU General
** Public License versions 2.0 or 3.0 as published by the Free
** Software Foundation and appearing in the files LICENSE.GPL2
** and LICENSE.GPL3 included in the packaging of this file.
** Alternatively you may (at your option) use any later version
** of the GNU General Public License if such license has been
** publicly approved by Trolltech ASA (or its successors, if any)
** and the KDE Free TQt Foundation.
**
** Please review the following information to ensure GNU General
** Public Licensing retquirements will be met:
** http://trolltech.com/products/qt/licenses/licensing/opensource/.
** If you are unsure which license is appropriate for your use, please
** review the following information:
** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
** or contact the sales department at sales@trolltech.com.
**
** Licensees holding valid TQt Commercial licenses may use this file in
** accordance with the TQt Commercial License Agreement provided with
** the Software.
**
** This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE. Trolltech reserves all rights not granted
** herein.
**
**********************************************************************/

#include "glwidget.h"

/*!
  Create a GLWidget widget
*/

GLWidget::GLWidget( TQWidget* parent, const char* name )
    : TQGLWidget( parent, name )
{
    xrot = yrot = zrot = 25;		// default object rotation
    scale_ = 1.25;			// default object scale
    object = 0;
}

/*!
  Release allocated resources
*/

GLWidget::~GLWidget()
{
    glDeleteLists( object, 1 );
}


/*!
  Paint the box. The actual openGL commands for drawing the box are
  performed here.
*/

void GLWidget::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 GLWidget::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 GLWidget::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 GLWidget::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(  1.0f,  0.5f, -0.4f );
    glVertex3f(  1.0f, -0.5f, -0.4f );
    glVertex3f( -1.0f, -0.5f, -0.4f );
    glVertex3f( -1.0f,  0.5f, -0.4f );
    glEnd();

    glBegin( GL_LINE_LOOP );
    glVertex3f(  1.0f,  0.5f, 0.4f );
    glVertex3f(  1.0f, -0.5f, 0.4f );
    glVertex3f( -1.0f, -0.5f, 0.4f );
    glVertex3f( -1.0f,  0.5f, 0.4f );
    glEnd();

    glBegin( GL_LINES );
    glVertex3f(  1.0f,  0.5f, -0.4f );   glVertex3f(  1.0f,  0.5f, 0.4f );
    glVertex3f(  1.0f, -0.5f, -0.4f );   glVertex3f(  1.0f, -0.5f, 0.4f );
    glVertex3f( -1.0f, -0.5f, -0.4f );   glVertex3f( -1.0f, -0.5f, 0.4f );
    glVertex3f( -1.0f,  0.5f, -0.4f );   glVertex3f( -1.0f,  0.5f, 0.4f );
    glEnd();

    glEndList();

    return list;
}

void GLWidget::setXRot( double x )
{
    xrot = x;
    update();
}

void GLWidget::setYRot( double y )
{
    yrot = y;
    update();
}

void GLWidget::setZRot( double z )
{
    zrot = z;
    update();
}

void GLWidget::setScale( double s )
{
    scale_ = s;
    update();
}