Copy the KDE 3.5 branch to branches/trinity for new KDE 3.5 features.

BUG:215923


git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/kdegraphics@1054174 283d02a7-25f6-0310-bc7c-ecb5cbfe19da

1 files changed, 190 insertions, 0 deletions

diff --git a/kpovmodeler/pmformulalabel.cpp b/kpovmodeler/pmformulalabel.cpp
new file mode 100644
index 00000000..ac2e98d3
--- /dev/null
+++ b/kpovmodeler/pmformulalabel.cpp
@@ -0,0 +1,190 @@
+/*
+**************************************************************************
+                                 description
+                             --------------------
+    copyright            : (C) 2002 by Andreas Zehender
+    email                : [email protected]
+**************************************************************************
+
+**************************************************************************
+*                                                                        *
+*  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;
+}