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/***************************************************************************
* $Id$
**
* 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.
**
****************************************************************************/
import org.kde.qt.*;
import java.util.*;
class Scribble extends QMainWindow
{
protected Canvas canvas;
protected QSpinBox bPWidth;
protected QToolButton bPColor, bSave, bClear;
class Canvas extends QWidget
{
void setPenColor( QColor c )
{ pen.setColor( c ); }
void setPenWidth( int w )
{ pen.setWidth( w ); }
QColor penColor()
{ return pen.color(); }
int penWidth()
{ return pen.width(); }
protected QPen pen;
protected QPointArray polyline;
protected boolean mousePressed;
protected QPixmap buffer = new QPixmap();
public boolean no_writing = false;
Canvas( QWidget parent )
{
this(parent, null);
}
Canvas( QWidget parent, String name )
{
super( parent, name, WStaticContents );
pen = new QPen( Qt.red(), 3 );
polyline = new QPointArray(3);
if ((qApp().args().length > 0) && !buffer.load(qApp().args()[0]))
buffer.fill( colorGroup().base() );
setBackgroundMode( QWidget.PaletteBase );
setCursor( Qt.crossCursor() );
}
void save( String filename, String format )
{
if ( !no_writing )
buffer.save( filename, format.toUpperCase() );
}
void clearScreen()
{
buffer.fill( colorGroup().base() );
repaint( false );
}
protected void mousePressEvent( QMouseEvent e )
{
mousePressed = true;
polyline.setPoint(0, e.pos());
polyline.setPoint(1, e.pos());
polyline.setPoint(2, e.pos());
}
protected void mouseReleaseEvent( QMouseEvent e )
{
mousePressed = false;
}
protected void mouseMoveEvent( QMouseEvent e )
{
if ( mousePressed ) {
QPainter painter = new QPainter();
painter.begin( buffer );
painter.setPen( pen );
polyline.setPoint(2, polyline.at(1));
polyline.setPoint(1, polyline.at(0));
polyline.setPoint(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() );
}
}
protected void resizeEvent( QResizeEvent e )
{
super.resizeEvent( e );
int w = width() > buffer.width() ?
width() : buffer.width();
int h = height() > buffer.height() ?
height() : buffer.height();
QPixmap tmp = new QPixmap( buffer );
buffer.resize( w, h );
buffer.fill( colorGroup().base() );
bitBlt( buffer, 0, 0, tmp, 0, 0, tmp.width(), tmp.height() );
}
protected void paintEvent( QPaintEvent e )
{
super.paintEvent( e );
ArrayList rects = e.region().rects();
for ( int i = 0; i < rects.size(); i++ ) {
QRect r = (QRect) rects.get(i);
bitBlt( this, r.x(), r.y(), buffer, r.x(), r.y(), r.width(), r.height() );
}
}
}
//------------------------------------------------------
Scribble( )
{
this(null, null);
}
Scribble( QWidget parent, String name )
{
super( parent, name );
canvas = new Canvas( this );
setCentralWidget( canvas );
QToolBar tools = new QToolBar( this );
bSave = new QToolButton( new QIconSet(), "Save", "Save as PNG image", this, SLOT(" slotSave()"), tools );
bSave.setText( "Save as..." );
tools.addSeparator();
bPColor = new QToolButton( new QIconSet(), "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( new QIconSet(), "Clear Screen", "Clear Screen", this, SLOT(" slotClear()"), tools );
bClear.setText( "Clear Screen" );
}
void slotSave()
{
QPopupMenu menu = new QPopupMenu( null );
HashMap formats = new HashMap();
for ( int i = 0; i < QImageIO.outputFormats().size(); i++ ) {
String str = (String) QImageIO.outputFormats().get( i );
formats.put( new Integer(menu.insertItem( str + "..." )), str );
}
menu.setMouseTracking( true );
int id = menu.exec( bSave.mapToGlobal( new QPoint( 0, bSave.height() + 1 ) ) );
if ( id != -1 ) {
String format = (String) formats.get( new Integer(id) );
String filename = QFileDialog.getSaveFileName( "", "*." + format.toLowerCase(), this );
if ( !filename.equals("") )
canvas.save( filename, format );
}
}
void slotColor()
{
QColor c = QColorDialog.getColor( canvas.penColor(), this );
if ( c.isValid() )
canvas.setPenColor( c );
}
void slotWidth( int w )
{
canvas.setPenWidth( w );
}
void slotClear()
{
canvas.clearScreen();
}
}
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