qtdso-0.3.1.rar dsovumeter.cpp

www.pudn.com > qtdso-0.3.1.rar > dsovumeter.cpp

//======================================================================
// File: dsovumeter.cpp
// Author: Matthias Toussaint
// Created: Sun Sep 8 12:46:10 CEST 2002
//----------------------------------------------------------------------
// Permission to use, copy, modify, and distribute this software and its
// documentation for any purpose and without fee is hereby granted,
// provided that below copyright notice appear in all copies and that
// both that copyright notice and this permission notice appear in
// supporting documentation.
//
// This file is provided AS IS with no warranties of any kind. The
// author shall have no liability with respect to the infringement of
// copyrights, trade secrets or any patents by this file or any part
// thereof. In no event will the author be liable for any lost revenue
// or profits or other special, indirect and consequential damages.
//----------------------------------------------------------------------
// (c) 2000-2002 Matthias Toussaint
//======================================================================

#include <qpainter.h>
#include <dsowid.h>
#include <dsovumeter.h>
#include <qpixmap.h>

#include <qdrawutil.h>

#include <iostream>

QSize
DsoVuMeter::sizeHint() const
{
return QSize( 140, fontMetrics().height()+4 );
}

DsoVuMeter::DsoVuMeter( int channel, int maxValue,
QWidget *parent, const char *name ) :
QWidget( parent, name ),
m_channel( channel ),
m_maxValue( maxValue ),
m_min( 127 ),
m_max( 127 )
{
setBackgroundMode( QWidget::NoBackground );
}

DsoVuMeter::~DsoVuMeter()
{
}

void
DsoVuMeter::setValuesSLOT( int maxValue, int min, int max )
{
m_min = min;
m_max = max;
m_maxValue = maxValue;

update();
}

void
DsoVuMeter::paintEvent( QPaintEvent */*ev*/ )
{
QPixmap doubleBuffer( width(), height() );

QPainter p;
p.begin(&amt;doubleBuffer);

if ((0 == m_min || m_maxValue == m_max) &amt;&amt; isEnabled())
{
p.fillRect( 0, 0, width(), height(), Qt::red.light() );
}
else
{
p.fillRect( 0, 0, width(), height(), colorGroup().background() );
}

int tw = fontMetrics().width( tr("Ch2") ) + 2;
int w = width()-tw-4;
int h = height()-4;

if (0 == m_channel)
{
p.drawText( 2, 2, tw, h, Qt::AlignLeft | Qt::AlignVCenter,
tr("Ch1") );
}
else
{
p.drawText( 2, 2, tw, h, Qt::AlignLeft | Qt::AlignVCenter,
tr("Ch2") );
}

qDrawShadePanel( &amt;p, 2+tw, 2, w, h, colorGroup(), true, 1, 0 );

if (isEnabled())
{
float min = 3 + tw + (float)m_min / (float)m_maxValue * (float)(w-2);
float max = 3 + tw + (float)m_max / (float)m_maxValue * (float)(w-2);

int w2 = (int)qRound( max-min );
if (w2 < 1) w2 = 1;

p.fillRect( 3+tw, 3, w-2, h-2, DsoWid::chColor[m_channel].dark( 150 ) );
p.fillRect( static_cast<int> (min), 5,
w2, h-6, DsoWid::chColor[m_channel] );
}
p.end();
p.begin( this );
p.drawPixmap( 0, 0, doubleBuffer );
p.end();
}