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179 lines
5.0 KiB
179 lines
5.0 KiB
/****************************************************************************
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**
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** Copyright (C) 1992-2008 Trolltech ASA. All rights reserved.
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**
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** This file is part of an example program for TQt. This example
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** program may be used, distributed and modified without limitation.
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**
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*****************************************************************************/
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#include "canvas.h"
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#include <ntqapplication.h>
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#include <ntqpainter.h>
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#include <ntqevent.h>
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#include <ntqrect.h>
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const bool no_writing = FALSE;
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Canvas::Canvas( TQWidget *parent, const char *name, WFlags fl )
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: TQWidget( parent, name, WStaticContents | fl ),
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pen( TQt::red, 3 ), polyline(3),
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mousePressed( FALSE ), oldPressure( 0 ), saveColor( red ),
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buffer( width(), height() )
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{
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if ((tqApp->argc() > 0) && !buffer.load(tqApp->argv()[1]))
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buffer.fill( colorGroup().base() );
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setBackgroundMode( TQWidget::PaletteBase );
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#ifndef QT_NO_CURSOR
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setCursor( TQt::crossCursor );
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#endif
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}
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void Canvas::save( const TQString &filename, const TQString &format )
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{
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if ( !no_writing )
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buffer.save( filename, format.upper() );
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}
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void Canvas::clearScreen()
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{
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buffer.fill( colorGroup().base() );
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repaint( FALSE );
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}
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void Canvas::mousePressEvent( TQMouseEvent *e )
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{
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mousePressed = TRUE;
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polyline[2] = polyline[1] = polyline[0] = e->pos();
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}
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void Canvas::mouseReleaseEvent( TQMouseEvent * )
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{
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mousePressed = FALSE;
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}
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void Canvas::mouseMoveEvent( TQMouseEvent *e )
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{
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if ( mousePressed ) {
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TQPainter painter;
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painter.begin( &buffer );
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painter.setPen( pen );
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polyline[2] = polyline[1];
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polyline[1] = polyline[0];
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polyline[0] = e->pos();
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painter.drawPolyline( polyline );
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painter.end();
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TQRect r = polyline.boundingRect();
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r = r.normalize();
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r.setLeft( r.left() - penWidth() );
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r.setTop( r.top() - penWidth() );
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r.setRight( r.right() + penWidth() );
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r.setBottom( r.bottom() + penWidth() );
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bitBlt( this, r.x(), r.y(), &buffer, r.x(), r.y(), r.width(), r.height() );
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}
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}
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void Canvas::tabletEvent( TQTabletEvent *e )
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{
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e->accept();
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// change the width based on range of pressure
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if ( e->device() == TQTabletEvent::Stylus ) {
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if ( e->pressure() >= 0 && e->pressure() <= 32 )
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pen.setColor( saveColor.light(175) );
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else if ( e->pressure() > 32 && e->pressure() <= 64 )
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pen.setColor( saveColor.light(150) );
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else if ( e->pressure() > 64 && e->pressure() <= 96 )
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pen.setColor( saveColor.light(125) );
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else if ( e->pressure() > 96 && e->pressure() <= 128 )
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pen.setColor( saveColor );
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else if ( e->pressure() > 128 && e->pressure() <= 160 )
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pen.setColor( saveColor.dark(150) );
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else if ( e->pressure() > 160 && e->pressure() <= 192 )
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pen.setColor( saveColor.dark(200) );
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else if ( e->pressure() > 192 && e->pressure() <= 224 )
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pen.setColor( saveColor.dark(250) );
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else // pressure > 224
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pen.setColor( saveColor.dark(300) );
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} else if ( e->device() == TQTabletEvent::Eraser
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&& pen.color() != backgroundColor() ) {
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pen.setColor( backgroundColor() );
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}
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int xt = e->xTilt();
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int yt = e->yTilt();
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if ( ( xt > -15 && xt < 15 ) && ( yt > -15 && yt < 15 ) )
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pen.setWidth( 3 );
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else if ( ((xt < -15 && xt > -30) || (xt > 15 && xt < 30)) &&
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((yt < -15 && yt > -30) || (yt > 15 && yt < 30 )) )
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pen.setWidth( 6 );
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else if ( ((xt < -30 && xt > -45) || (xt > 30 && xt < 45)) &&
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((yt < -30 && yt > -45) || (yt > 30 && yt < 45)) )
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pen.setWidth( 9 );
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else if ( (xt < -45 || xt > 45 ) && ( yt < -45 || yt > 45 ) )
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pen.setWidth( 12 );
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switch ( e->type() ) {
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case TQEvent::TabletPress:
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mousePressed = TRUE;
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polyline[2] = polyline[1] = polyline[0] = e->pos();
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break;
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case TQEvent::TabletRelease:
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mousePressed = FALSE;
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break;
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case TQEvent::TabletMove:
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if ( mousePressed ) {
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TQPainter painter;
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painter.begin( &buffer );
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painter.setPen( pen );
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polyline[2] = polyline[1];
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polyline[1] = polyline[0];
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polyline[0] = e->pos();
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painter.drawPolyline( polyline );
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painter.end();
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TQRect r = polyline.boundingRect();
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r = r.normalize();
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r.setLeft( r.left() - penWidth() );
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r.setTop( r.top() - penWidth() );
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r.setRight( r.right() + penWidth() );
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r.setBottom( r.bottom() + penWidth() );
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bitBlt( this, r.x(), r.y(), &buffer, r.x(), r.y(), r.width(),
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r.height() );
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}
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break;
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default:
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break;
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}
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}
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void Canvas::resizeEvent( TQResizeEvent *e )
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{
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TQWidget::resizeEvent( e );
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int w = width() > buffer.width() ?
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width() : buffer.width();
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int h = height() > buffer.height() ?
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height() : buffer.height();
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TQPixmap tmp( buffer );
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buffer.resize( w, h );
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buffer.fill( colorGroup().base() );
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bitBlt( &buffer, 0, 0, &tmp, 0, 0, tmp.width(), tmp.height() );
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}
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void Canvas::paintEvent( TQPaintEvent *e )
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{
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TQWidget::paintEvent( e );
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TQMemArray<TQRect> rects = e->region().rects();
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for ( uint i = 0; i < rects.count(); i++ ) {
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TQRect r = rects[(int)i];
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bitBlt( this, r.x(), r.y(), &buffer, r.x(), r.y(), r.width(), r.height() );
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}
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}
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