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Diffstat (limited to 'examples/tablet/canvas.cpp')
| -rw-r--r-- | examples/tablet/canvas.cpp | 178 |
1 files changed, 178 insertions, 0 deletions
diff --git a/examples/tablet/canvas.cpp b/examples/tablet/canvas.cpp new file mode 100644 index 000000000..6d5c0fe75 --- /dev/null +++ b/examples/tablet/canvas.cpp @@ -0,0 +1,178 @@ +/**************************************************************************** +** +** Copyright (C) 1992-2008 Trolltech ASA. All rights reserved. +** +** This file is part of an example program for TQt. This example +** program may be used, distributed and modified without limitation. +** +*****************************************************************************/ + +#include "canvas.h" + +#include <qapplication.h> +#include <qpainter.h> +#include <qevent.h> +#include <qrect.h> + +const bool no_writing = FALSE; + +Canvas::Canvas( TQWidget *parent, const char *name, WFlags fl ) + : TQWidget( parent, name, WStaticContents | fl ), + pen( TQt::red, 3 ), polyline(3), + mousePressed( FALSE ), oldPressure( 0 ), saveColor( red ), + buffer( width(), height() ) +{ + + if ((qApp->argc() > 0) && !buffer.load(qApp->argv()[1])) + buffer.fill( colorGroup().base() ); + setBackgroundMode( TQWidget::PaletteBase ); +#ifndef QT_NO_CURSOR + setCursor( TQt::crossCursor ); +#endif +} + +void Canvas::save( const TQString &filename, const TQString &format ) +{ + if ( !no_writing ) + buffer.save( filename, format.upper() ); +} + +void Canvas::clearScreen() +{ + buffer.fill( colorGroup().base() ); + repaint( FALSE ); +} + +void Canvas::mousePressEvent( TQMouseEvent *e ) +{ + mousePressed = TRUE; + polyline[2] = polyline[1] = polyline[0] = e->pos(); +} + +void Canvas::mouseReleaseEvent( TQMouseEvent * ) +{ + mousePressed = FALSE; +} + +void Canvas::mouseMoveEvent( TQMouseEvent *e ) +{ + if ( mousePressed ) { + TQPainter painter; + painter.begin( &buffer ); + painter.setPen( pen ); + polyline[2] = polyline[1]; + polyline[1] = polyline[0]; + polyline[0] = e->pos(); + painter.drawPolyline( polyline ); + painter.end(); + + TQRect 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::tabletEvent( TQTabletEvent *e ) +{ + e->accept(); + // change the width based on range of pressure + if ( e->device() == TQTabletEvent::Stylus ) { + if ( e->pressure() >= 0 && e->pressure() <= 32 ) + pen.setColor( saveColor.light(175) ); + else if ( e->pressure() > 32 && e->pressure() <= 64 ) + pen.setColor( saveColor.light(150) ); + else if ( e->pressure() > 64 && e->pressure() <= 96 ) + pen.setColor( saveColor.light(125) ); + else if ( e->pressure() > 96 && e->pressure() <= 128 ) + pen.setColor( saveColor ); + else if ( e->pressure() > 128 && e->pressure() <= 160 ) + pen.setColor( saveColor.dark(150) ); + else if ( e->pressure() > 160 && e->pressure() <= 192 ) + pen.setColor( saveColor.dark(200) ); + else if ( e->pressure() > 192 && e->pressure() <= 224 ) + pen.setColor( saveColor.dark(250) ); + else // pressure > 224 + pen.setColor( saveColor.dark(300) ); + } else if ( e->device() == TQTabletEvent::Eraser + && pen.color() != backgroundColor() ) { + pen.setColor( backgroundColor() ); + } + + int xt = e->xTilt(); + int yt = e->yTilt(); + if ( ( xt > -15 && xt < 15 ) && ( yt > -15 && yt < 15 ) ) + pen.setWidth( 3 ); + else if ( ((xt < -15 && xt > -30) || (xt > 15 && xt < 30)) && + ((yt < -15 && yt > -30) || (yt > 15 && yt < 30 )) ) + pen.setWidth( 6 ); + else if ( ((xt < -30 && xt > -45) || (xt > 30 && xt < 45)) && + ((yt < -30 && yt > -45) || (yt > 30 && yt < 45)) ) + pen.setWidth( 9 ); + else if ( (xt < -45 || xt > 45 ) && ( yt < -45 || yt > 45 ) ) + pen.setWidth( 12 ); + + switch ( e->type() ) { + case TQEvent::TabletPress: + mousePressed = TRUE; + polyline[2] = polyline[1] = polyline[0] = e->pos(); + break; + case TQEvent::TabletRelease: + mousePressed = FALSE; + break; + case TQEvent::TabletMove: + if ( mousePressed ) { + TQPainter painter; + painter.begin( &buffer ); + painter.setPen( pen ); + polyline[2] = polyline[1]; + polyline[1] = polyline[0]; + polyline[0] = e->pos(); + painter.drawPolyline( polyline ); + painter.end(); + + TQRect 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() ); + } + break; + default: + break; + } +} + +void Canvas::resizeEvent( TQResizeEvent *e ) +{ + TQWidget::resizeEvent( e ); + + int w = width() > buffer.width() ? + width() : buffer.width(); + int h = height() > buffer.height() ? + height() : buffer.height(); + + TQPixmap tmp( buffer ); + buffer.resize( w, h ); + buffer.fill( colorGroup().base() ); + bitBlt( &buffer, 0, 0, &tmp, 0, 0, tmp.width(), tmp.height() ); +} + +void Canvas::paintEvent( TQPaintEvent *e ) +{ + TQWidget::paintEvent( e ); + + TQMemArray<TQRect> rects = e->region().rects(); + for ( uint i = 0; i < rects.count(); i++ ) { + TQRect r = rects[(int)i]; + bitBlt( this, r.x(), r.y(), &buffer, r.x(), r.y(), r.width(), r.height() ); + } +} |