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/**
* SPDX-FileCopyrightText: 2001-2015 Klaralvdalens Datakonsult AB. All rights reserved.
*
* This file is part of the KD Chart library.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "Model.h"
#include "KChartMath_p.h"
#include <QRandomGenerator>
#include <QDebug>
#include <QTime>
#include <QElapsedTimer>
static const qreal s_stepWidth = 0.1;
Model::Model()
: m_x( 0 ),
m_function( SineFunction )
{
m_appendTimer.setInterval( 3 );
connect( &m_appendTimer, SIGNAL(timeout()), SLOT(appendPoint()) );
// pre-fill some values
appendPoints( 100 );
}
int Model::columnCount( const QModelIndex& parent ) const
{
Q_UNUSED( parent );
return 2; // row 0: x, row 1: y
}
int Model::rowCount( const QModelIndex& parent ) const
{
Q_UNUSED( parent );
return m_data.count();
}
QModelIndex Model::index( int row, int column, const QModelIndex& parent ) const
{
if ( column > 1 || row >= m_data.count() || parent.isValid() ) {
return QModelIndex();
}
return createIndex( row, column );
}
QModelIndex Model::parent( const QModelIndex& index ) const
{
Q_UNUSED( index );
return QModelIndex();
}
QVariant Model::data( const QModelIndex& index, int role ) const
{
if ( role != Qt::DisplayRole || index.parent().isValid() ||
index.column() > 1 || index.row() >= m_data.count() ) {
return QVariant();
}
if ( index.column() == 0 ) {
return index.row() * s_stepWidth;
} else {
return m_data.at( index.row() );
}
}
// slot
void Model::setFunction( Function f )
{
m_function = f;
}
void Model::setRunning( bool running )
{
if ( running ) {
m_appendTimer.start();
} else {
m_appendTimer.stop();
}
}
// slot
void Model::appendPoint()
{
appendPoints( 1 );
}
void Model::appendPoints( int numPoints )
{
Q_ASSERT( numPoints >= 1);
beginInsertRows( QModelIndex(), m_data.count(), m_data.count() + numPoints - 1 );
for ( int i = 0; i < numPoints; i++ ) {
m_data.append( nextFunctionValue() );
}
QElapsedTimer stopWatch;
stopWatch.start();
endInsertRows(); // this immediately triggers the signals that cause the diagram to update
qDebug() << "Adding" << numPoints << "data points to the existing" << m_data.count() - numPoints
<< "took" << stopWatch.elapsed() << "milliseconds";
}
qreal Model::nextFunctionValue()
{
qreal fx = 0.0;
switch ( m_function ) {
case SineFunction:
fx = sin( m_x );
break;
case TriangleFunction: {
qreal x = fmod( m_x + 0.5 * M_PI, 2 * M_PI ); // make it look like sine, only less round
if ( x < M_PI ) {
fx = -1.0 + x * ( 2.0 / M_PI);
} else {
fx = 3.0 - x * ( 2.0 / M_PI);
}
break; }
case SquareFunction: {
qreal x = fmod( m_x, 2 * M_PI );
fx = x < M_PI ? 1 : -1;
break; }
case NoiseFunction:
fx = -1.0 + qreal( QRandomGenerator::global()->generate() ) * 2.0 / qreal( RAND_MAX );
break;
case SineOneDivFunction: {
// we want this repeating and we want negative arguments, too.
qreal x = fmod( m_x + 10, 20 ) - 10;
if ( qAbs( x ) < 1e-6 ) {
break;
}
fx = sin( 1.0 / x );
break; }
case OneDivSineFunction: {
qreal s = sin( m_x );
fx = qAbs( s ) > 1e-6 ? 1.0 / s : 0.0;
break; }
default:
Q_ASSERT( false );
}
m_x += s_stepWidth;
return fx;
}
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