qt_demoe/qwtdemo/qwt/qwt_compass.cpp

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2019-11-07 02:55:57 +00:00
/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
* Qwt Widget Library
* Copyright (C) 1997 Josef Wilgen
* Copyright (C) 2002 Uwe Rathmann
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the Qwt License, Version 1.0
*****************************************************************************/
#include "qwt_compass.h"
#include "qwt_compass_rose.h"
#include "qwt_math.h"
#include "qwt_scale_draw.h"
#include "qwt_painter.h"
#include "qwt_dial_needle.h"
#include <qpainter.h>
#include <qpixmap.h>
#include <qevent.h>
/*!
\brief Constructor
Initializes a label map for multiples of 45 degrees
*/
QwtCompassScaleDraw::QwtCompassScaleDraw()
{
enableComponent( QwtAbstractScaleDraw::Backbone, false );
enableComponent( QwtAbstractScaleDraw::Ticks, false );
d_labelMap.insert( 0.0, QString::fromLatin1( "N" ) );
d_labelMap.insert( 45.0, QString::fromLatin1( "NE" ) );
d_labelMap.insert( 90.0, QString::fromLatin1( "E" ) );
d_labelMap.insert( 135.0, QString::fromLatin1( "SE" ) );
d_labelMap.insert( 180.0, QString::fromLatin1( "S" ) );
d_labelMap.insert( 225.0, QString::fromLatin1( "SW" ) );
d_labelMap.insert( 270.0, QString::fromLatin1( "W" ) );
d_labelMap.insert( 315.0, QString::fromLatin1( "NW" ) );
#if 0
d_labelMap.insert( 22.5, QString::fromLatin1( "NNE" ) );
d_labelMap.insert( 67.5, QString::fromLatin1( "NEE" ) );
d_labelMap.insert( 112.5, QString::fromLatin1( "SEE" ) );
d_labelMap.insert( 157.5, QString::fromLatin1( "SSE" ) );
d_labelMap.insert( 202.5, QString::fromLatin1( "SSW" ) );
d_labelMap.insert( 247.5, QString::fromLatin1( "SWW" ) );
d_labelMap.insert( 292.5, QString::fromLatin1( "NWW" ) );
d_labelMap.insert( 337.5, QString::fromLatin1( "NNW" ) );
#endif
}
/*!
\brief Constructor
\param map Value to label map
*/
QwtCompassScaleDraw::QwtCompassScaleDraw( const QMap<double, QString> &map ):
d_labelMap( map )
{
enableComponent( QwtAbstractScaleDraw::Backbone, false );
enableComponent( QwtAbstractScaleDraw::Ticks, false );
}
/*!
\brief Set a map, mapping values to labels
\param map Value to label map
The values of the major ticks are found by looking into this
map. The default map consists of the labels N, NE, E, SE, S, SW, W, NW.
\warning The map will have no effect for values that are no major
tick values. Major ticks can be changed by QwtScaleDraw::setScale
\sa labelMap(), scaleDraw(), setScale()
*/
void QwtCompassScaleDraw::setLabelMap( const QMap<double, QString> &map )
{
d_labelMap = map;
}
/*!
\return map, mapping values to labels
\sa setLabelMap()
*/
QMap<double, QString> QwtCompassScaleDraw::labelMap() const
{
return d_labelMap;
}
/*!
Map a value to a corresponding label
\param value Value that will be mapped
label() looks in the labelMap() for a corresponding label for value
or returns an null text.
\return Label, or QString::null
\sa labelMap(), setLabelMap()
*/
QwtText QwtCompassScaleDraw::label( double value ) const
{
if ( qFuzzyCompare( value + 1.0, 1.0 ) )
value = 0.0;
if ( value < 0.0 )
value += 360.0;
if ( d_labelMap.contains( value ) )
return d_labelMap[value];
return QwtText();
}
class QwtCompass::PrivateData
{
public:
PrivateData():
rose( NULL )
{
}
~PrivateData()
{
delete rose;
}
QwtCompassRose *rose;
};
/*!
\brief Constructor
\param parent Parent widget
Create a compass widget with a scale, no needle and no rose.
The default origin is 270.0 with no valid value. It accepts
mouse and keyboard inputs and has no step size. The default mode
is QwtDial::RotateNeedle.
*/
QwtCompass::QwtCompass( QWidget* parent ):
QwtDial( parent )
{
d_data = new PrivateData;
setScaleDraw( new QwtCompassScaleDraw() );
setOrigin( 270.0 );
setWrapping( true );
setScaleMaxMajor( 36 );
setScaleMaxMinor( 10 );
setScale( 0.0, 360.0 ); // degrees as default
setTotalSteps( 360 );
}
//! Destructor
QwtCompass::~QwtCompass()
{
delete d_data;
}
/*!
Draw the contents of the scale
\param painter Painter
\param center Center of the content circle
\param radius Radius of the content circle
*/
void QwtCompass::drawScaleContents( QPainter *painter,
const QPointF &center, double radius ) const
{
QPalette::ColorGroup cg;
if ( isEnabled() )
cg = hasFocus() ? QPalette::Active : QPalette::Inactive;
else
cg = QPalette::Disabled;
double north = origin();
if ( isValid() )
{
if ( mode() == RotateScale )
north -= value();
}
const int margin = 4;
drawRose( painter, center, radius - margin, 360.0 - north, cg );
}
/*!
Draw the compass rose
\param painter Painter
\param center Center of the compass
\param radius of the circle, where to paint the rose
\param north Direction pointing north, in degrees counter clockwise
\param cg Color group
*/
void QwtCompass::drawRose( QPainter *painter, const QPointF &center,
double radius, double north, QPalette::ColorGroup cg ) const
{
if ( d_data->rose )
d_data->rose->draw( painter, center, radius, north, cg );
}
/*!
Set a rose for the compass
\param rose Compass rose
\warning The rose will be deleted, when a different rose is
set or in ~QwtCompass
\sa rose()
*/
void QwtCompass::setRose( QwtCompassRose *rose )
{
if ( rose != d_data->rose )
{
if ( d_data->rose )
delete d_data->rose;
d_data->rose = rose;
update();
}
}
/*!
\return rose
\sa setRose()
*/
const QwtCompassRose *QwtCompass::rose() const
{
return d_data->rose;
}
/*!
\return rose
\sa setRose()
*/
QwtCompassRose *QwtCompass::rose()
{
return d_data->rose;
}
/*!
Handles key events
Beside the keys described in QwtDial::keyPressEvent numbers
from 1-9 (without 5) set the direction according to their
position on the num pad.
\sa isReadOnly()
*/
void QwtCompass::keyPressEvent( QKeyEvent *kev )
{
if ( isReadOnly() )
return;
#if 0
if ( kev->key() == Key_5 )
{
invalidate(); // signal ???
return;
}
#endif
double newValue = value();
if ( kev->key() >= Qt::Key_1 && kev->key() <= Qt::Key_9 )
{
if ( mode() != RotateNeedle || kev->key() == Qt::Key_5 )
return;
switch ( kev->key() )
{
case Qt::Key_6:
newValue = 180.0 * 0.0;
break;
case Qt::Key_3:
newValue = 180.0 * 0.25;
break;
case Qt::Key_2:
newValue = 180.0 * 0.5;
break;
case Qt::Key_1:
newValue = 180.0 * 0.75;
break;
case Qt::Key_4:
newValue = 180.0 * 1.0;
break;
case Qt::Key_7:
newValue = 180.0 * 1.25;
break;
case Qt::Key_8:
newValue = 180.0 * 1.5;
break;
case Qt::Key_9:
newValue = 180.0 * 1.75;
break;
}
newValue -= origin();
setValue( newValue );
}
else
{
QwtDial::keyPressEvent( kev );
}
}