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/*****************************************************************************
* info_widgets.cpp : Widgets for info panels
****************************************************************************
* Copyright (C) 2013 the VideoLAN team
*
* 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., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
*****************************************************************************/
#include "qt4.hpp"
#include "info_widgets.hpp"
#include <QGridLayout>
#include <QLabel>
#include <QGraphicsView>
#include <QGraphicsScene>
#include <QPolygonF>
#include <QGraphicsPolygonItem>
#include <QGraphicsLineItem>
#include <QVectorIterator>
#define STATS_LENGTH 60
#define ADD_LABEL(row, color, text) \
label = new QLabel( QString( "<font color=\"%1\">%2</font>" ) \
.arg( color.name() ) \
.arg( text ) \
); \
layout->addWidget( label, row, 0, 1, 1, 0 );
VLCStatsView::VLCStatsView( QWidget *parent ) : QGraphicsView( parent )
{
QColor history(0, 0, 0, 255),
total(237, 109, 0, 160),
content(109, 237, 0, 160);
scale( 1.0, -1.0 ); /* invert our Y axis */
setOptimizationFlags( QGraphicsView::DontAdjustForAntialiasing );
setAlignment( Qt::AlignLeft );
setVerticalScrollBarPolicy( Qt::ScrollBarAlwaysOff );
setHorizontalScrollBarPolicy( Qt::ScrollBarAlwaysOff );
viewScene = new QGraphicsScene( this );
historyShape = viewScene->addPolygon( QPolygonF(), QPen(Qt::NoPen),
QBrush(history) );
totalbitrateShape = viewScene->addPolygon( QPolygonF(), QPen(Qt::NoPen),
QBrush(total) );
setScene( viewScene );
reset();
QPen linepen( Qt::DotLine );
linepen.setCosmetic( true );
linepen.setBrush( QBrush( QColor( 33, 33, 33 ) ) );
for ( int i=0; i<3; i++ )
rulers[i] = viewScene->addLine( QLineF(), linepen );
}
#undef ADD_LABEL
void VLCStatsView::reset()
{
historymergepointer = 0;
blocksize = 4;
valuesaccumulator = 0;
valuesaccumulatorcount = 0;
historyShape->setPolygon( QPolygonF() );
totalbitrateShape->setPolygon( QPolygonF() );
}
void VLCStatsView::addValue( float value )
{
value /= 1000;
QPolygonF shape = totalbitrateShape->polygon();
if ( shape.count() > ( STATS_LENGTH + 2 ) ) /* keep only STATS_LENGTH samples */
{
shape.remove( 1 );
for(int i=1; i<( STATS_LENGTH + 2 ); i++)
( (QPointF &) shape.at(i) ).setX( i - 1 ); /*move back values*/
}
int count = shape.count();
if ( count == 0 )
{
shape << QPointF( 0, 0 ); /* begin and close shape */
shape << QPointF( count, 0 );
}
shape.insert( shape.end() - 1, QPointF( count, value ) );
( (QPointF &) shape.last() ).setX( count );
totalbitrateShape->setPolygon( shape );
addHistoryValue( value );
QRectF maxsizes = scene()->itemsBoundingRect();
maxsizes.setRight( STATS_LENGTH );
fitInView( maxsizes ); /* fix viewport */
drawRulers( maxsizes );
}
void VLCStatsView::drawRulers( const QRectF &maxsizes )
{
float height = maxsizes.height() * 1000;
int texp = 0;
while( height > 1.0 ) { height /= 10; texp++; }
height = 1.0;
while( texp-- ) height *= 10;
for ( int i=0; i<3; i++ )
{
float y = ( height / 5 ) * ( i + 1 ) / 1000;
rulers[i]->setLine( QLineF( 0, y, STATS_LENGTH, y ) );
}
}
void VLCStatsView::addHistoryValue( float value )
{
/* We keep a full history by creating virtual blocks for inserts, growing
by power of 2 when no more space is available. At this time, we also
free space by agregating the oldest values 2 by 2.
Each shown value finally being a mean of blocksize samples.
*/
bool doinsert = false;
int next_blocksize = blocksize;
QPolygonF shape = historyShape->polygon();
int count = shape.count();
if ( count == 0 )
{
shape << QPointF( 0, 0 ); /* begin and close shape */
shape << QPointF( count, 0 );
}
valuesaccumulator += ( value / blocksize );
valuesaccumulatorcount++;
if ( valuesaccumulatorcount == blocksize )
{
valuesaccumulator = 0;
valuesaccumulatorcount = 0;
doinsert = true;
}
if ( doinsert )
{
if ( count > ( STATS_LENGTH + 2 ) )
{
float y = 0;
y += ((QPointF &) shape.at( historymergepointer + 1 )).y();
y += ((QPointF &) shape.at( historymergepointer + 2 )).y();
y /= 2;
/* merge */
shape.remove( historymergepointer + 2 );
( (QPointF &) shape.at( historymergepointer + 1 ) ).setY( y );
for(int i=historymergepointer +1; i<( STATS_LENGTH + 2 ); i++)
( (QPointF &) shape.at(i) ).setX( i - 1 ); /*move back values*/
historymergepointer++;
if ( historymergepointer > ( STATS_LENGTH - 1 ) )
{
historymergepointer = 0;
next_blocksize = ( blocksize << 1 );
}
}
shape.insert( shape.end() - 1, QPointF( count, value ) );
( (QPointF &) shape.last() ).setX( count );
}
else
( (QPointF &) shape.last() ).setX( count - 1 );
historyShape->setPolygon( shape );
blocksize = next_blocksize;
}
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