Home · All Namespaces · All Classes · Main Classes · Grouped Classes · Modules · Functions

ledmeter.cpp Example File
graphicsview/portedasteroids/ledmeter.cpp

 /****************************************************************************
 **
 ** Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies).
 ** Contact: Qt Software Information ([email protected])
 **
 ** This file is part of the example classes of the Qt Toolkit.
 **
 ** Commercial Usage
 ** Licensees holding valid Qt Commercial licenses may use this file in
 ** accordance with the Qt Commercial License Agreement provided with the
 ** Software or, alternatively, in accordance with the terms contained in
 ** a written agreement between you and Nokia.
 **
 **
 ** GNU General Public License Usage
 ** Alternatively, this file may be used under the terms of the GNU
 ** General Public License versions 2.0 or 3.0 as published by the Free
 ** Software Foundation and appearing in the file LICENSE.GPL included in
 ** the packaging of this file.  Please review the following information
 ** to ensure GNU General Public Licensing requirements will be met:
 ** http://www.fsf.org/licensing/licenses/info/GPLv2.html and
 ** http://www.gnu.org/copyleft/gpl.html.  In addition, as a special
 ** exception, Nokia gives you certain additional rights. These rights
 ** are described in the Nokia Qt GPL Exception version 1.3, included in
 ** the file GPL_EXCEPTION.txt in this package.
 **
 ** Qt for Windows(R) Licensees
 ** As a special exception, Nokia, as the sole copyright holder for Qt
 ** Designer, grants users of the Qt/Eclipse Integration plug-in the
 ** right for the Qt/Eclipse Integration to link to functionality
 ** provided by Qt Designer and its related libraries.
 **
 ** If you are unsure which license is appropriate for your use, please
 ** contact the sales department at [email protected].
 **
 ****************************************************************************/

 /*
  * KAsteroids - Copyright (c) Martin R. Jones 1997
  *
  * Part of the KDE project
  */

 #include <qpainter.h>
 //Added by qt3to4:
 #include <QResizeEvent>
 #include <Q3Frame>
 #include "ledmeter.h"

 KALedMeter::KALedMeter( QWidget *parent ) : Q3Frame( parent )
 {
     mCRanges.setAutoDelete( TRUE );
     mRange = 100;
     mCount = 20;
     mCurrentCount = 0;
     mValue = 0;
     setMinimumWidth( mCount * 2 + frameWidth() );
 }

 void KALedMeter::setRange( int r )
 {
     mRange = r;
     if ( mRange < 1 )
         mRange = 1;
     setValue( mValue );
     update();
 }

 void KALedMeter::setCount( int c )
 {
     mCount = c;
     if ( mCount < 1 )
         mCount = 1;
     setMinimumWidth( mCount * 2 + frameWidth() );
     calcColorRanges();
     setValue( mValue );
     update();
 }

 void KALedMeter::setValue( int v )
 {
     mValue = v;
     if ( mValue > mRange )
         mValue = mRange;
     else if ( mValue < 0 )
         mValue = 0;
     int c = ( mValue + mRange / mCount - 1 ) * mCount / mRange;
     if ( c != mCurrentCount )
     {
         mCurrentCount = c;
         update();
     }
 }

 void KALedMeter::addColorRange( int pc, const QColor &c )
 {
     ColorRange *cr = new ColorRange;
     cr->mPc = pc;
     cr->mColor = c;
     mCRanges.append( cr );
     calcColorRanges();
 }

 void KALedMeter::resizeEvent( QResizeEvent *e )
 {
     Q3Frame::resizeEvent( e );
     int w = ( width() - frameWidth() - 2 ) / mCount * mCount;
     w += frameWidth() + 2;
     setFrameRect( QRect( 0, 0, w, height() ) );
 }

 void KALedMeter::drawContents( QPainter *p )
 {
     QRect b = contentsRect();

     unsigned cidx = 0;
     int ncol = mCount;
     QColor col = colorGroup().foreground();

     if ( !mCRanges.isEmpty() )
     {
         col = mCRanges.at( cidx )->mColor;
         ncol = mCRanges.at( cidx )->mValue;
     }
     p->setBrush( col );
     p->setPen( col );

     int lw = b.width() / mCount;
     int lx = b.left() + 1;
     for ( int i = 0; i < mCurrentCount; i++, lx += lw )
     {
         if ( i > ncol )
         {
             if ( ++cidx < mCRanges.count() )
             {
                 col = mCRanges.at( cidx )->mColor;
                 ncol = mCRanges.at( cidx )->mValue;
                 p->setBrush( col );
                 p->setPen( col );
             }
         }

         p->drawRect( lx, b.top() + 1, lw - 1, b.height() - 2 );
     }
 }

 void KALedMeter::calcColorRanges()
 {
     int prev = 0;
     ColorRange *cr;
     for ( cr = mCRanges.first(); cr; cr = mCRanges.next() )
     {
         cr->mValue = prev + cr->mPc * mCount / 100;
         prev = cr->mValue;
     }
 }