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-rw-r--r--kpovmodeler/pmformulalabel.cpp190
1 files changed, 190 insertions, 0 deletions
diff --git a/kpovmodeler/pmformulalabel.cpp b/kpovmodeler/pmformulalabel.cpp
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+++ b/kpovmodeler/pmformulalabel.cpp
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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;
+}