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// KPPPLoad - a PPP load monitor
// Copyright (C) 1998 Sean Vyain, svyain@mail.tds.net
//
// 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.
//
// 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#include <qpainter.h>
#include "Graph.h"
#include "Options.h"
Graph::Graph( QWidget* parent, const char* name )
: QWidget( parent, name ),
_historySize( 0 ),
_txHistory( 0 ),
_rxHistory( 0 ),
_txAverage( 0 ),
_rxAverage( 0 ),
_max( 1 )
{
// Allocate data arrays.
_dataSize = options->getStatsPeriod() / options->getStatsInterval();
_txData = new int[ _dataSize ];
_rxData = new int[ _dataSize ];
for ( int i = 0; i < _dataSize; i++ ) {
_txData[i] = 0;
_rxData[i] = 0;
}
connect( options, SIGNAL( sigRateDivider() ), this, SLOT( redrawGraph() ) );
connect( options, SIGNAL( sigRxColor() ) , this, SLOT( redrawGraph() ) );
connect( options, SIGNAL( sigTxColor() ) , this, SLOT( redrawGraph() ) );
}
Graph::~Graph()
{
}
void Graph::updateStats( uint rxDelta, uint txDelta, uint, uint )
{
int oldMax = _max;
// Compute the new transmit and receive load averages
_txAverage = _txAverage - _txData[_dataSize-1] + txDelta;
_rxAverage = _rxAverage - _rxData[_dataSize-1] + rxDelta;
// Shift the transmit and receive data.
for ( int i = _dataSize-1; i > 0; i-- ) {
_txData[i] = _txData[i-1];
_rxData[i] = _rxData[i-1];
}
_txData[0] = txDelta;
_rxData[0] = rxDelta;
// Find a new maximum, if needed.
if (( _txHistory[_historySize-1] == _max ) || ( _rxHistory[_historySize-1] == _max )) {
_max = 1;
for ( int i = 0; i < _historySize-1; i++ ) {
if ( _txHistory[i] > _max ) _max = _txHistory[i];
if ( _rxHistory[i] > _max ) _max = _rxHistory[i];
}
}
// Shift the history by one.
for ( int i = _historySize-1; i > 0; i-- ) {
_txHistory[i] = _txHistory[i-1];
_rxHistory[i] = _rxHistory[i-1];
}
// Store the new transfer rates.
_txHistory[0] = _txAverage / _dataSize;
_rxHistory[0] = _rxAverage / _dataSize;
// Update the maximum rate (again).
if ( _txHistory[0] > _max ) _max = _txHistory[0];
if ( _rxHistory[0] > _max ) _max = _rxHistory[0];
// Rescale, if needed.
if ( oldMax != _max ) {
redrawGraph();
} else {
updateGraph();
}
paintEvent( 0 );
}
void Graph::linkDown()
{
for ( int i = 0; i < _dataSize; i++ ) {
_txData[i] = 0;
_rxData[i] = 0;
}
for ( int i = 0; i < _historySize; i++ ) {
_txHistory[i] = 0;
_rxHistory[i] = 0;
}
_max = 1;
_txAverage = 0;
_rxAverage = 0;
redrawGraph();
paintEvent( 0 );
}
void Graph::resizeEvent( QResizeEvent* )
{
int* txNew = new int[ width() ];
int* rxNew = new int[ width() ];
for ( int i = 0; (i < _historySize) && (i < width()); i++ ) {
txNew[i] = _txHistory[i];
rxNew[i] = _rxHistory[i];
}
for ( int i = _historySize; i < width(); i++ ) {
txNew[i] = 0;
rxNew[i] = 0;
}
delete [] _txHistory;
delete [] _rxHistory;
_historySize = width();
_txHistory = txNew;
_rxHistory = rxNew;
// Redraw the graph.
_pixmap.resize( width(), height() );
redrawGraph();
}
void Graph::paintEvent( QPaintEvent* )
{
bitBlt( this, 0, 0, &_pixmap, 0, 0, width(), height(), CopyROP );
}
void Graph::mousePressEvent( QMouseEvent* e )
{
if ( e->button() == RightButton ) {
emit popupMenu( mapToGlobal( e->pos() ) );
}
}
void Graph::redrawGraph()
{
QPainter p;
p.begin( &_pixmap );
p.setBackgroundColor( backgroundColor() );
p.eraseRect( 0, 0, width(), height() );
// Draw dividing lines.
p.setPen( black );
for ( int i = options->getRateDivider() * options->getStatsInterval(); i < _max;
i += options->getRateDivider() * options->getStatsInterval() ) {
p.drawLine( 0, height() - i * height() / _max, width(), height() - i * height() / _max );
}
// Plot data.
for ( int i = 1; i < _historySize; i++ ) {
p.setPen( options->getRxColor() );
p.drawLine( width() - i - 1, height() - _rxHistory[i-1] * height() / _max, width() - i - 2, height() - _rxHistory[i] * height() / _max );
p.drawLine( width() - i - 1, height() - _rxHistory[i-1] * height() / _max + 1, width() - i - 2, height() - _rxHistory[i] * height() / _max + 1 );
p.setPen( options->getTxColor() );
p.drawLine( width() - i - 1, height() - _txHistory[i-1] * height() / _max, width() - i - 2, height() - _txHistory[i] * height() / _max );
p.drawLine( width() - i - 1, height() - _txHistory[i-1] * height() / _max + 1, width() - i - 2, height() - _txHistory[i] * height() / _max + 1 );
}
p.end();
}
void Graph::updateGraph()
{
// Move the existing data over one pixel.
bitBlt( &_pixmap, 0, 0, &_pixmap, 1, 0, width() - 1, height(), CopyROP );
QPainter p;
p.begin( &_pixmap );
p.setBackgroundColor( backgroundColor() );
p.eraseRect( width() - 1, 0, width() - 1, height() );
// Draw dividing lines.
p.setPen( black );
for ( int i = options->getRateDivider() * options->getStatsInterval(); i < _max;
i += options->getRateDivider() * options->getStatsInterval() ) {
p.drawPoint( width()-1, height() - i * height() / _max );
}
// Plot data.
p.setPen( options->getRxColor() );
p.drawLine( width() - 1, height() - _rxHistory[0] * height() / _max, width() - 2, height() - _rxHistory[1] * height() / _max );
p.drawLine( width() - 1, height() - _rxHistory[0] * height() / _max + 1, width() - 2, height() - _rxHistory[1] * height() / _max + 1 );
p.setPen( options->getTxColor() );
p.drawLine( width() - 1, height() - _txHistory[0] * height() / _max, width() - 2, height() - _txHistory[1] * height() / _max );
p.drawLine( width() - 1, height() - _txHistory[0] * height() / _max + 1, width() - 2, height() - _txHistory[1] * height() / _max + 1 );
p.end();
}
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