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/****************************************************************************
**
** Copyright (C) 1992-2008 Trolltech ASA. 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();
}
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