/****************************************************************************** $Id: qt/globjwin.cpp   3.1.1   edited Nov 8 10:35 $**** 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.*******************************************************************************//******************************************************************************** Implementation of GLObjectWindow widget class******************************************************************************/#include <qpushbutton.h>#include <qslider.h>#include <qlayout.h>#include <qframe.h>#include <qlabel.h>#include <qmenubar.h>#include <qpopupmenu.h>#include <qapplication.h>#include <qkeycode.h>#include <qpixmap.h>#include <qimage.h>#include <qpainter.h>#include "globjwin.h"#include "glbox.h"GLObjectWindow::GLObjectWindow( QWidget* parent, const char* name )    : QWidget( parent, name ){    // Create a menu    file = new QPopupMenu( this );    file->setCheckable( TRUE );    file->insertItem( "Grab Frame Buffer", this, SLOT(grabFrameBuffer()) );    file->insertItem( "Render Pixmap", this, SLOT(makePixmap()) );    file->insertItem( "Render Pixmap Hidden", this, SLOT(makePixmapHidden()) );    file->insertSeparator();    fixMenuItemId = file->insertItem( "Use Fixed Pixmap Size", this, 				      SLOT(useFixedPixmapSize()) );    file->insertSeparator();    insertMenuItemId = file->insertItem( "Insert Pixmap Here", this, 					 SLOT(makePixmapForMenu()) );    file->insertSeparator();    file->insertItem( "Exit",  qApp, SLOT(quit()), CTRL+Key_Q );    // Create a menu bar    QMenuBar *m = new QMenuBar( this );    m->setSeparator( QMenuBar::InWindowsStyle );    m->insertItem("&File", file );    // Create nice frames to put around the OpenGL widgets    QFrame* f1 = new QFrame( this, "frame1" );    f1->setFrameStyle( QFrame::Sunken | QFrame::Panel );    f1->setLineWidth( 2 );    // Create an OpenGL widget    c1 = new GLBox( f1, "glbox1");    // Create a label that can display the pixmap    lb = new QLabel( this, "pixlabel" );    lb->setFrameStyle( QFrame::Sunken | QFrame::Panel );    lb->setLineWidth( 2 );    lb->setAlignment( AlignCenter );    lb->setMargin( 0 );    lb->setIndent( 0 );    // Create the three sliders; one for each rotation axis    QSlider* x = new QSlider ( 0, 360, 60, 0, QSlider::Vertical, this, "xsl" );    x->setTickmarks( QSlider::Left );    connect( x, SIGNAL(valueChanged(int)), c1, SLOT(setXRotation(int)) );    QSlider* y = new QSlider ( 0, 360, 60, 0, QSlider::Vertical, this, "ysl" );    y->setTickmarks( QSlider::Left );    connect( y, SIGNAL(valueChanged(int)), c1, SLOT(setYRotation(int)) );    QSlider* z = new QSlider ( 0, 360, 60, 0, QSlider::Vertical, this, "zsl" );    z->setTickmarks( QSlider::Left );    connect( z, SIGNAL(valueChanged(int)), c1, SLOT(setZRotation(int)) );    // Now that we have all the widgets, put them into a nice layout    // Put the sliders on top of each other    QVBoxLayout* vlayout = new QVBoxLayout( 20, "vlayout");    vlayout->addWidget( x );    vlayout->addWidget( y );    vlayout->addWidget( z );    // Put the GL widget inside the frame    QHBoxLayout* flayout1 = new QHBoxLayout( f1, 2, 2, "flayout1");    flayout1->addWidget( c1, 1 );    // Top level layout, puts the sliders to the left of the frame/GL widget    QHBoxLayout* hlayout = new QHBoxLayout( this, 20, 20, "hlayout");    hlayout->setMenuBar( m );    hlayout->addLayout( vlayout );    hlayout->addWidget( f1, 1 );    hlayout->addWidget( lb, 1 );}void GLObjectWindow::grabFrameBuffer(){    QImage img = c1->grabFrameBuffer();    // Convert image to pixmap so we can show it    QPixmap pm;    pm.convertFromImage( img, AvoidDither );    drawOnPixmap( &pm );    lb->setPixmap( pm );}void GLObjectWindow::makePixmap(){    // Make a pixmap to to be rendered by the gl widget    QPixmap pm;    // Render the pixmap, with either c1's size or the fixed size pmSz    if ( pmSz.isValid() )	pm = c1->renderPixmap( pmSz.width(), pmSz.height() );    else 	pm = c1->renderPixmap();    if ( !pm.isNull() ) {	// Present the pixmap to the user	drawOnPixmap( &pm );	lb->setPixmap( pm );    }    else {	lb->setText( "Failed to render Pixmap." );    }}void GLObjectWindow::makePixmapHidden(){    // Make a QGLWidget to draw the pixmap. This widget will not be shown.    GLBox* w = new GLBox( this, "temporary glwidget", c1 );    bool success = FALSE;    QPixmap pm;    if ( w->isValid() ) {	// Set the current rotation	w->copyRotation( *c1 );	// Determine wanted pixmap size	QSize sz = pmSz.isValid() ? pmSz : c1->size();	// Make our hidden glwidget render the pixmap	pm = w->renderPixmap( sz.width(), sz.height() );	if ( !pm.isNull() )	    success = TRUE;    }    if ( success ) {	// Present the pixmap to the user	drawOnPixmap( &pm );	lb->setPixmap( pm );    }    else {	lb->setText( "Failed to render Pixmap." );    }    delete w;}void GLObjectWindow::drawOnPixmap( QPixmap* pm ){    // Draw some text on the pixmap to differentiate it from the GL window    if ( pm->isNull() ) {	qWarning("Cannot draw on null pixmap");	return;    }    else {	QPainter p( pm );       p.setFont( QFont( "Helvetica", 18 ) );	p.setPen( white );	p.drawText( pm->rect(), AlignCenter, "This is a Pixmap" );    }}void GLObjectWindow::useFixedPixmapSize(){    if ( pmSz.isValid() ) {	pmSz = QSize();	file->setItemChecked( fixMenuItemId, FALSE );    }    else {	pmSz = QSize( 200, 200 );	file->setItemChecked( fixMenuItemId, TRUE );    }}void GLObjectWindow::makePixmapForMenu(){    QPixmap pm = c1->renderPixmap( 32, 32 );    if ( !pm.isNull() )	file->changeItem( pm, "Insert Pixmap Here", insertMenuItemId );}