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/*
**************************************************************************
description
--------------------
copyright : (C) 2002 by Andreas Zehender
email : zehender@kde.org
**************************************************************************
**************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
**************************************************************************/
#include "pmformulalabel.h"
#include "pmpolynomexponents.h"
#include <qapplication.h>
#include <qsimplerichtext.h>
#include <qpainter.h>
const int c_indent = 3;
const int c_dotSize = 3;
QString PMFormulaLabel::s_xyz[3] =
{
QString( "x" ), QString( "y" ), QString( "z" )
};
QString PMFormulaLabel::s_digit[10] =
{
QString( "0" ),
QString( "1" ),
QString( "2" ),
QString( "3" ),
QString( "4" ),
QString( "5" ),
QString( "6" ),
QString( "7" ),
QString( "8" ),
QString( "9" )
};
QString PMFormulaLabel::s_nullString = QString( "= 0" );
PMFormulaLabel::PMFormulaLabel( const PMPolynomExponents& exp, QWidget* parent, const char* name )
: QWidget( parent, name )
{
m_exponents[0] = exp.exponent( 0 );
m_exponents[1] = exp.exponent( 1 );
m_exponents[2] = exp.exponent( 2 );
calculateSizeHint( );
}
PMFormulaLabel::PMFormulaLabel( int x, int y, int z, QWidget* parent, const char* name )
: QWidget( parent, name )
{
m_exponents[0] = x;
m_exponents[1] = y;
m_exponents[2] = z;
calculateSizeHint( );
}
PMFormulaLabel::~PMFormulaLabel( )
{
}
void PMFormulaLabel::drawContents( QPainter* p )
{
QRect cr = rect( );
int i;
cr.setLeft( cr.left( ) + c_indent );
int sum = m_exponents[0] + m_exponents[1] + m_exponents[2];
if( sum == 0 )
p->drawText( cr, Qt::AlignVCenter | Qt::AlignLeft, s_nullString );
else
{
// draw dot
int center = ( cr.top( ) + cr.bottom( ) ) / 2;
int rad = c_dotSize / 2;
p->setBrush( QBrush( colorGroup( ).text( ) ) );
p->drawEllipse( cr.left( ), center - rad, c_dotSize, c_dotSize );
cr.setLeft( cr.left( ) + c_dotSize + c_indent );
QFontMetrics m1( font( ) );
QFont f2 = exponentFont( );
QFontMetrics m2( f2 );
int up = m1.height( ) / 2;
for( i = 0; i < 3; i++ )
{
if( m_exponents[i] > 0 )
{
p->drawText( cr, Qt::AlignVCenter | Qt::AlignLeft, s_xyz[i] );
cr.setLeft( cr.left( ) + m1.width( s_xyz[i] ) );
if( m_exponents[i] > 1 )
{
cr.setBottom( cr.bottom( ) - up );
p->setFont( f2 );
p->drawText( cr, Qt::AlignVCenter | Qt::AlignLeft,
s_digit[m_exponents[i]] );
cr.setLeft( cr.left( ) + m2.width( s_digit[m_exponents[i]] ) + 1 );
cr.setBottom( cr.bottom( ) + up );
p->setFont( font( ) );
}
}
}
}
}
void PMFormulaLabel::paintEvent( QPaintEvent* ev )
{
QPainter paint( this );
if( ev->rect( ).intersects( rect( ) ) )
{
paint.setClipRegion( ev->region( ).intersect( rect( ) ) );
drawContents( &paint );
}
}
void PMFormulaLabel::calculateSizeHint( )
{
int sum = m_exponents[0] + m_exponents[1] + m_exponents[2];
QFontMetrics m1( font( ) );
if( sum == 0 )
m_sizeHint.setWidth( m1.width( s_nullString ) );
else
{
QFontMetrics m2( exponentFont( ) );
int width = c_indent * 3 + c_dotSize;
int i;
for( i = 0; i < 3; i++ )
{
if( m_exponents[i] > 0 )
{
width += m1.width( s_xyz[i] );
if( m_exponents[i] > 1 )
width += m2.width( s_digit[m_exponents[i]] ) + 1;
}
}
m_sizeHint.setWidth( width );
}
m_sizeHint.setHeight( m1.height( ) + 7 );
}
QSize PMFormulaLabel::sizeHint( ) const
{
return minimumSizeHint( );
}
QSize PMFormulaLabel::minimumSizeHint( ) const
{
return m_sizeHint;
}
void PMFormulaLabel::fontChange( const QFont& )
{
calculateSizeHint( );
}
QFont PMFormulaLabel::exponentFont( ) const
{
QFont small = font( );
int fs = small.pointSize( );
if( fs > 0 )
{
fs = fs * 2 / 3;
if( fs == 0 )
fs = 1;
small.setPointSize( fs );
}
else
{
fs = small.pixelSize( );
fs = fs * 2 / 3;
if( fs == 0 )
fs = 1;
small.setPixelSize( fs );
}
return small;
}
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