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/*
KSysGuard, the KDE System Guard
Copyright (c) 1999, 2000 Chris Schlaeger <cs@kde.org>
This program is free software; you can redistribute it and/or
modify it under the terms of version 2 of the GNU General Public
License as published by the Free Software Foundation
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
KSysGuard is currently maintained by Chris Schlaeger <cs@kde.org>.
Please do not commit any changes without consulting me first. Thanks!
*/
#include <assert.h>
#include <string.h>
#include <qpainter.h>
#include <kdebug.h>
#include <kiconloader.h>
#include <ksgrd/StyleEngine.h>
#include "BarGraph.h"
BarGraph::BarGraph( QWidget *parent, const char *name )
: QWidget( parent, name )
{
// paintEvent covers whole widget so we use no background to avoid flicker
setBackgroundMode( NoBackground );
bars = 0;
minValue = 0.0;
maxValue = 100.0;
lowerLimit = upperLimit = 0.0;
lowerLimitActive = upperLimitActive = false;
normalColor = KSGRD::Style->firstForegroundColor();
alarmColor = KSGRD::Style->alarmColor();
backgroundColor = KSGRD::Style->backgroundColor();
fontSize = KSGRD::Style->fontSize();
// Anything smaller than this does not make sense.
setMinimumSize( 16, 16 );
setSizePolicy( QSizePolicy( QSizePolicy::Expanding,
QSizePolicy::Expanding, false ) );
}
BarGraph::~BarGraph()
{
}
bool BarGraph::addBar( const QString &footer )
{
samples.resize( bars + 1 );
samples[ bars++ ] = 0.0;
footers.append( footer );
return true;
}
bool BarGraph::removeBar( uint idx )
{
if ( idx >= bars ) {
kdDebug(1215) << "BarGraph::removeBar: idx " << idx << " out of range "
<< bars << endl;
return false;
}
samples.resize( --bars );
footers.remove( footers.at( idx ) );
update();
return true;
}
void BarGraph::updateSamples( const QMemArray<double> &newSamples )
{
samples = newSamples;
update();
}
void BarGraph::changeRange( double min, double max )
{
minValue = min;
maxValue = max;
}
void BarGraph::paintEvent( QPaintEvent* )
{
int w = width();
int h = height();
QPixmap pm( w, h );
QPainter p;
p.begin( &pm, this );
p.setFont( QFont( p.font().family(), fontSize ) );
QFontMetrics fm( p.font() );
pm.fill( backgroundColor );
/* Draw white line along the bottom and the right side of the
* widget to create a 3D like look. */
p.setPen( QColor( colorGroup().light() ) );
p.drawLine( 0, h - 1, w - 1, h - 1 );
p.drawLine( w - 1, 0, w - 1, h - 1 );
p.setClipRect( 1, 1, w - 2, h - 2 );
if ( bars > 0 ) {
int barWidth = ( w - 2 ) / bars;
uint b;
/* Labels are only printed underneath the bars if the labels
* for all bars are smaller than the bar width. If a single
* label does not fit no label is shown. */
bool showLabels = true;
for ( b = 0; b < bars; b++ )
if ( fm.width( footers[ b ] ) > barWidth )
showLabels = false;
int barHeight;
if ( showLabels )
barHeight = h - 2 - ( 2 * fm.lineSpacing() ) - 2;
else
barHeight = h - 2;
for ( uint b = 0; b < bars; b++ ) {
int topVal = (int) ( (float)barHeight / maxValue *
( samples[ b ] - minValue ) );
/* TODO: This widget does not handle negative values properly. */
if ( topVal < 0 )
topVal = 0;
for ( int i = 0; i < barHeight && i < topVal; i += 2 ) {
if ( ( upperLimitActive && samples[ b ] > upperLimit ) ||
( lowerLimitActive && samples[ b ] < lowerLimit ) )
p.setPen( alarmColor.light( static_cast<int>( 30 + ( 70.0 /
( barHeight + 1 ) * i ) ) ) );
else
p.setPen( normalColor.light( static_cast<int>( 30 + ( 70.0 /
( barHeight + 1 ) * i ) ) ) );
p.drawLine( b * barWidth + 3, barHeight - i, ( b + 1 ) * barWidth - 3,
barHeight - i );
}
if ( ( upperLimitActive && samples[ b ] > upperLimit ) ||
( lowerLimitActive && samples[ b ] < lowerLimit ) )
p.setPen( alarmColor );
else
p.setPen( normalColor );
if ( showLabels ) {
p.drawText( b * barWidth + 3, h - ( 2 * fm.lineSpacing() ) - 2,
barWidth - 2 * 3, fm.lineSpacing(), Qt::AlignCenter,
footers[ b ] );
p.drawText( b * barWidth + 3, h - fm.lineSpacing() - 2,
barWidth - 2 * 3, fm.lineSpacing(), Qt::AlignCenter,
QString( "%1" ).arg( samples[ b ] ) );
}
}
}
p.end();
bitBlt( this, 0, 0, &pm );
}
#include "BarGraph.moc"
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