147 lines
3.9 KiB
C++
147 lines
3.9 KiB
C++
/*****************************************************************************
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* Qwt Examples - Copyright (C) 2002 Uwe Rathmann
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* This file may be used under the terms of the 3-clause BSD License
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*****************************************************************************/
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#include "AttitudeIndicator.h"
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#include <QwtPointPolar>
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#include <QwtRoundScaleDraw>
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#include <QwtDialNeedle>
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#include <QKeyEvent>
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#include <QPainter>
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#include <QPainterPath>
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namespace
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{
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class Needle : public QwtDialNeedle
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{
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public:
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Needle( const QColor& color )
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{
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QPalette palette;
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palette.setColor( QPalette::Text, color );
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setPalette( palette );
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}
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protected:
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virtual void drawNeedle( QPainter* painter,
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double length, QPalette::ColorGroup colorGroup ) const QWT_OVERRIDE
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{
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double triangleSize = length * 0.1;
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double pos = length - 2.0;
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QPainterPath path;
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path.moveTo( pos, 0 );
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path.lineTo( pos - 2 * triangleSize, triangleSize );
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path.lineTo( pos - 2 * triangleSize, -triangleSize );
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path.closeSubpath();
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painter->setBrush( palette().brush( colorGroup, QPalette::Text ) );
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painter->drawPath( path );
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double l = length - 2;
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painter->setPen( QPen( palette().color( colorGroup, QPalette::Text ), 3 ) );
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painter->drawLine( QPointF( 0.0, -l ), QPointF( 0.0, l ) );
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}
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};
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}
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AttitudeIndicator::AttitudeIndicator( QWidget* parent )
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: QwtDial( parent )
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, m_gradient( 0.0 )
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{
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QwtRoundScaleDraw* scaleDraw = new QwtRoundScaleDraw();
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scaleDraw->enableComponent( QwtAbstractScaleDraw::Backbone, false );
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scaleDraw->enableComponent( QwtAbstractScaleDraw::Labels, false );
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setScaleDraw( scaleDraw );
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setMode( RotateScale );
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setWrapping( true );
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setOrigin( 270.0 );
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setScaleMaxMinor( 0 );
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setScaleStepSize( 30.0 );
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setScale( 0.0, 360.0 );
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const QColor color = palette().color( QPalette::Text );
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setNeedle( new Needle( color ) );
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}
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void AttitudeIndicator::setGradient( double gradient )
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{
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if ( gradient < -1.0 )
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gradient = -1.0;
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else if ( gradient > 1.0 )
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gradient = 1.0;
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if ( m_gradient != gradient )
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{
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m_gradient = gradient;
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update();
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}
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}
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void AttitudeIndicator::drawScale( QPainter* painter,
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const QPointF& center, double radius ) const
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{
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const double offset = 4.0;
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const QPointF p0 = qwtPolar2Pos( center, offset, 1.5 * M_PI );
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const double w = innerRect().width();
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QPainterPath path;
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path.moveTo( qwtPolar2Pos( p0, w, 0.0 ) );
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path.lineTo( qwtPolar2Pos( path.currentPosition(), 2 * w, M_PI ) );
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path.lineTo( qwtPolar2Pos( path.currentPosition(), w, 0.5 * M_PI ) );
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path.lineTo( qwtPolar2Pos( path.currentPosition(), w, 0.0 ) );
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painter->save();
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painter->setClipPath( path ); // swallow 180 - 360 degrees
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QwtDial::drawScale( painter, center, radius );
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painter->restore();
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}
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void AttitudeIndicator::drawScaleContents(
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QPainter* painter, const QPointF&, double ) const
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{
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int dir = 360 - qRound( origin() - value() ); // counter clockwise
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int arc = 90 + qRound( gradient() * 90 );
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const QColor skyColor( 38, 151, 221 );
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painter->save();
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painter->setBrush( skyColor );
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painter->drawChord( scaleInnerRect(),
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( dir - arc ) * 16, 2 * arc * 16 );
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painter->restore();
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}
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void AttitudeIndicator::keyPressEvent( QKeyEvent* event )
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{
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switch( event->key() )
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{
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case Qt::Key_Plus:
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{
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setGradient( gradient() + 0.05 );
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break;
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}
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case Qt::Key_Minus:
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{
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setGradient( gradient() - 0.05 );
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break;
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}
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default:
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QwtDial::keyPressEvent( event );
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}
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}
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#include "moc_AttitudeIndicator.cpp"
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