128 lines
3.3 KiB
C++
128 lines
3.3 KiB
C++
#include "attitude_indicator.h"
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#include <qwt_point_polar.h>
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#include <qwt_round_scale_draw.h>
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#include <qevent.h>
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#include <qpainter.h>
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#include <qpolygon.h>
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AttitudeIndicatorNeedle::AttitudeIndicatorNeedle( 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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void AttitudeIndicatorNeedle::drawNeedle( QPainter *painter,
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double length, QPalette::ColorGroup colorGroup ) const
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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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AttitudeIndicator::AttitudeIndicator(
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QWidget *parent ):
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QwtDial( parent ),
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d_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 AttitudeIndicatorNeedle( 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 ( d_gradient != gradient )
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{
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d_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 ¢er, 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( QPainter *painter,
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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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