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33fc476d89
* require qwt >=6.2 (and fallback to internal 6.3 if system's qwt doesn't suffice) * debian doesn't have qwt for Qt6 and won't have it for trixie
161 lines
3.5 KiB
C++
161 lines
3.5 KiB
C++
/******************************************************************************
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* Qwt Widget Library
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* Copyright (C) 1997 Josef Wilgen
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* Copyright (C) 2002 Uwe Rathmann
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the Qwt License, Version 1.0
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*****************************************************************************/
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#include "qwt_vectorfield_symbol.h"
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#include <qpainter.h>
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#include <qpainterpath.h>
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//! Constructor
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QwtVectorFieldSymbol::QwtVectorFieldSymbol()
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{
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}
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//! Destructor
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QwtVectorFieldSymbol::~QwtVectorFieldSymbol()
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{
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}
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class QwtVectorFieldArrow::PrivateData
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{
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public:
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PrivateData( qreal headW, qreal tailW )
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: headWidth( headW )
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, tailWidth( tailW )
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, length( headW + 4.0 )
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{
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/*
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Arrow is drawn horizontally, pointing into positive x direction
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with tip at 0,0.
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*/
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path.lineTo( -headWidth, headWidth );
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path.lineTo( -headWidth, tailWidth );
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path.lineTo( -length, tailWidth );
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path.lineTo( -length, -tailWidth );
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path.lineTo( -headWidth, -tailWidth );
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path.lineTo( -headWidth, -headWidth );
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path.closeSubpath();
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}
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void setLength( qreal l )
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{
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length = qMax( l, headWidth );
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path.setElementPositionAt( 3, -length, tailWidth );
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path.setElementPositionAt( 4, -length, -tailWidth );
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}
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const qreal headWidth;
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const qreal tailWidth;
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qreal length;
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QPainterPath path;
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};
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/*!
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\brief Constructor
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The length is initialized by headWidth + 4
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\param headWidth Width of the triangular head
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\param tailWidth Width of the arrow tail
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\sa setLength()
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*/
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QwtVectorFieldArrow::QwtVectorFieldArrow( qreal headWidth, qreal tailWidth )
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{
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m_data = new PrivateData( headWidth, tailWidth );
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}
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//! Destructor
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QwtVectorFieldArrow::~QwtVectorFieldArrow()
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{
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delete m_data;
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}
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void QwtVectorFieldArrow::setLength( qreal length )
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{
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m_data->setLength( length );
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}
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qreal QwtVectorFieldArrow::length() const
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{
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return m_data->length;
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}
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void QwtVectorFieldArrow::paint( QPainter* painter ) const
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{
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painter->drawPath( m_data->path );
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}
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class QwtVectorFieldThinArrow::PrivateData
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{
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public:
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PrivateData( qreal headW )
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: headWidth( headW )
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, length( headW + 4.0 )
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{
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path.lineTo( -headWidth, headWidth * 0.6 );
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path.moveTo( 0, 0 );
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path.lineTo( -headWidth, -headWidth * 0.6 );
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path.moveTo( 0, 0 );
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path.lineTo( -length, 0 );
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}
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const qreal headWidth;
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qreal length;
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QPainterPath path;
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};
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/*!
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\brief Constructor
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The length is initialized by headWidth + 4
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\param headWidth Width of the triangular head
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\sa setLength()
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*/
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QwtVectorFieldThinArrow::QwtVectorFieldThinArrow( qreal headWidth )
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{
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m_data = new PrivateData( headWidth );
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}
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//! \brief Destructor
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QwtVectorFieldThinArrow::~QwtVectorFieldThinArrow()
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{
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delete m_data;
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}
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void QwtVectorFieldThinArrow::setLength( qreal length )
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{
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m_data->length = length;
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const qreal headWidth = qMin( m_data->headWidth, length / 3.0 );
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QPainterPath& path = m_data->path;
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path.setElementPositionAt( 1, -headWidth, headWidth * 0.6 );
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path.setElementPositionAt( 3, -headWidth, -headWidth * 0.6 );
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path.setElementPositionAt( 5, -length, 0 );
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}
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qreal QwtVectorFieldThinArrow::length() const
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{
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return m_data->length;
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}
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void QwtVectorFieldThinArrow::paint(QPainter* p) const
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{
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p->drawPath( m_data->path );
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}
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