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- /****************************************************************************
- ** $Id: qt/scribble.cpp 3.0.3 edited Oct 12 12:18 $
- **
- ** 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.
- **
- *****************************************************************************/
-
- #include "scribble.h"
-
- #include <qapplication.h>
- #include <qevent.h>
- #include <qpainter.h>
- #include <qtoolbar.h>
- #include <qtoolbutton.h>
- #include <qspinbox.h>
- #include <qtooltip.h>
- #include <qrect.h>
- #include <qpoint.h>
- #include <qcolordialog.h>
- #include <qfiledialog.h>
- #include <qcursor.h>
- #include <qimage.h>
- #include <qstrlist.h>
- #include <qpopupmenu.h>
- #include <qintdict.h>
-
- const bool no_writing = FALSE;
-
- Canvas::Canvas( QWidget *parent, const char *name )
- : QWidget( parent, name, WStaticContents ), pen( Qt::red, 3 ), polyline(3),
- mousePressed( FALSE ), buffer( width(), height() )
- {
-
- if ((qApp->argc() > 0) && !buffer.load(qApp->argv()[1]))
- buffer.fill( colorGroup().base() );
- setBackgroundMode( QWidget::PaletteBase );
- #ifndef QT_NO_CURSOR
- setCursor( Qt::crossCursor );
- #endif
- }
-
- void Canvas::save( const QString &filename, const QString &format )
- {
- if ( !no_writing )
- buffer.save( filename, format.upper() );
- }
-
- void Canvas::clearScreen()
- {
- buffer.fill( colorGroup().base() );
- repaint( FALSE );
- }
-
- void Canvas::mousePressEvent( QMouseEvent *e )
- {
- mousePressed = TRUE;
- polyline[2] = polyline[1] = polyline[0] = e->pos();
- }
-
- void Canvas::mouseReleaseEvent( QMouseEvent * )
- {
- mousePressed = FALSE;
- }
-
- void Canvas::mouseMoveEvent( QMouseEvent *e )
- {
- if ( mousePressed ) {
- QPainter painter;
- painter.begin( &buffer );
- painter.setPen( pen );
- polyline[2] = polyline[1];
- polyline[1] = polyline[0];
- polyline[0] = e->pos();
- painter.drawPolyline( polyline );
- painter.end();
-
- QRect r = polyline.boundingRect();
- r = r.normalize();
- r.setLeft( r.left() - penWidth() );
- r.setTop( r.top() - penWidth() );
- r.setRight( r.right() + penWidth() );
- r.setBottom( r.bottom() + penWidth() );
-
- bitBlt( this, r.x(), r.y(), &buffer, r.x(), r.y(), r.width(), r.height() );
- }
- }
-
- void Canvas::resizeEvent( QResizeEvent *e )
- {
- QWidget::resizeEvent( e );
-
- int w = width() > buffer.width() ?
- width() : buffer.width();
- int h = height() > buffer.height() ?
- height() : buffer.height();
-
- QPixmap tmp( buffer );
- buffer.resize( w, h );
- buffer.fill( colorGroup().base() );
- bitBlt( &buffer, 0, 0, &tmp, 0, 0, tmp.width(), tmp.height() );
- }
-
- void Canvas::paintEvent( QPaintEvent *e )
- {
- QWidget::paintEvent( e );
-
- QMemArray<QRect> rects = e->region().rects();
- for ( uint i = 0; i < rects.count(); i++ ) {
- QRect r = rects[(int)i];
- bitBlt( this, r.x(), r.y(), &buffer, r.x(), r.y(), r.width(), r.height() );
- }
- }
-
- //------------------------------------------------------
-
- Scribble::Scribble( QWidget *parent, const char *name )
- : QMainWindow( parent, name )
- {
- canvas = new Canvas( this );
- setCentralWidget( canvas );
-
- QToolBar *tools = new QToolBar( this );
-
- bSave = new QToolButton( QPixmap(), "Save", "Save as PNG image", this, SLOT( slotSave() ), tools );
- bSave->setText( "Save as..." );
-
- tools->addSeparator();
-
- bPColor = new QToolButton( QPixmap(), "Choose Pen Color", "Choose Pen Color", this, SLOT( slotColor() ), tools );
- bPColor->setText( "Choose Pen Color..." );
-
- tools->addSeparator();
-
- bPWidth = new QSpinBox( 1, 20, 1, tools );
- QToolTip::add( bPWidth, "Choose Pen Width" );
- connect( bPWidth, SIGNAL( valueChanged( int ) ), this, SLOT( slotWidth( int ) ) );
- bPWidth->setValue( 3 );
-
- tools->addSeparator();
-
- bClear = new QToolButton( QPixmap(), "Clear Screen", "Clear Screen", this, SLOT( slotClear() ), tools );
- bClear->setText( "Clear Screen" );
- }
-
- void Scribble::slotSave()
- {
- QPopupMenu *menu = new QPopupMenu( 0 );
- QIntDict<QString> formats;
- formats.setAutoDelete( TRUE );
-
- for ( unsigned int i = 0; i < QImageIO::outputFormats().count(); i++ ) {
- QString str = QString( QImageIO::outputFormats().at( i ) );
- formats.insert( menu->insertItem( QString( "%1..." ).arg( str ) ), new QString( str ) );
- }
-
- menu->setMouseTracking( TRUE );
- int id = menu->exec( bSave->mapToGlobal( QPoint( 0, bSave->height() + 1 ) ) );
-
- if ( id != -1 ) {
- QString format = *formats[ id ];
-
- QString filename = QFileDialog::getSaveFileName( QString::null, QString( "*.%1" ).arg( format.lower() ), this );
- if ( !filename.isEmpty() )
- canvas->save( filename, format );
- }
-
- delete menu;
- }
-
- void Scribble::slotColor()
- {
- QColor c = QColorDialog::getColor( canvas->penColor(), this );
- if ( c.isValid() )
- canvas->setPenColor( c );
- }
-
- void Scribble::slotWidth( int w )
- {
- canvas->setPenWidth( w );
- }
-
- void Scribble::slotClear()
- {
- canvas->clearScreen();
- }
-