sim_plot_panel.cpp

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/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2016 CERN
 * Copyright (C) 2021 KiCad Developers, see AUTHORS.txt for contributors.
 *
 * @author Tomasz Wlostowski <[email protected]>
 * @author Maciej Suminski <[email protected]>
 *
 * 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 3
 * 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, you may find one here:
 * https://www.gnu.org/licenses/gpl-3.0.html
 * or you may search the http://www.gnu.org website for the version 3 license,
 * or you may write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
 */

#include "sim_plot_colors.h"
#include "sim_plot_panel.h"
#include "sim_plot_frame.h"

#include <algorithm>
#include <limits>


static wxString formatFloat( double x, int nDigits )
{
 wxString rv, fmt;

 if( nDigits )
 {
 fmt.Printf( "%%.0%df", nDigits );
 }
 else
 {
 fmt = wxT( "%.0f" );
 }

 rv.Printf( fmt, x );

 return rv;
}


static void getSISuffix( double x, const wxString& unit, int& power, wxString& suffix )
{
 const int n_powers = 11;

 const struct
 {
 double exponent;
 char suffix;
 } powers[] =
 {
 { -18, 'a' },
 { -15, 'f' },
 { -12, 'p' },
 { -9, 'n' },
 { -6, 'u' },
 { -3, 'm' },
 { 0, 0 },
 { 3, 'k' },
 { 6, 'M' },
 { 9, 'G' },
 { 12, 'T' },
 { 14, 'P' }
 };

 power = 0;
 suffix = unit;

 if( x == 0.0 )
 return;

 for( int i = 0; i < n_powers - 1; i++ )
 {
 double r_cur = pow( 10, powers[i].exponent );

 if( fabs( x ) >= r_cur && fabs( x ) < r_cur * 1000.0 )
 {
 power = powers[i].exponent;

 if( powers[i].suffix )
 suffix = wxString( powers[i].suffix ) + unit;
 else
 suffix = unit;

 return;
 }
 }
}


static int countDecimalDigits( double x, int maxDigits )
{
 if( std::isnan( x ) )
 {
 // avoid trying to count the decimals of NaN
 return 0;
 }

 int64_t k = (int)( ( x - floor( x ) ) * pow( 10.0, (double) maxDigits ) );
 int n = 0;

 while( k && ( ( k % 10LL ) == 0LL || ( k % 10LL ) == 9LL ) )
 {
 k /= 10LL;
 }

 n = 0;

 while( k != 0LL )
 {
 n++;
 k /= 10LL;
 }

 return n;
}


template <typename parent>
class LIN_SCALE : public parent
{
public:
 LIN_SCALE( wxString name, wxString unit, int flags ) : parent( name, flags ), m_unit( unit ){};

 void formatLabels() override
 {
 double maxVis = parent::AbsVisibleMaxValue();

 wxString suffix;
 int power, digits = 0;
 int constexpr DIGITS = 3;

 getSISuffix( maxVis, m_unit, power, suffix );

 double sf = pow( 10.0, power );

 for( auto& l : parent::TickLabels() )
 {
 int k = countDecimalDigits( l.pos / sf, DIGITS );

 digits = std::max( digits, k );
 }

 for( auto& l : parent::TickLabels() )
 {
 l.label = formatFloat( l.pos / sf, digits ) + suffix;
 l.visible = true;
 }
 }

private:
 const wxString m_unit;
};


template <typename parent>
class LOG_SCALE : public parent
{
public:
 LOG_SCALE( wxString name, wxString unit, int flags ) : parent( name, flags ), m_unit( unit ){};

 void formatLabels() override
 {
 wxString suffix;
 int power;

 for( auto& l : parent::TickLabels() )
 {
 getSISuffix( l.pos, m_unit, power, suffix );
 double sf = pow( 10.0, power );
 int k = countDecimalDigits( l.pos / sf, 3 );

 l.label = formatFloat( l.pos / sf, k ) + suffix;
 l.visible = true;
 }
 }

private:
 const wxString m_unit;
};


void CURSOR::Plot( wxDC& aDC, mpWindow& aWindow )
{
 if( !m_window )
 m_window = &aWindow;

 if( !m_visible )
 return;

 const auto& dataX = m_trace->GetDataX();
 const auto& dataY = m_trace->GetDataY();

 if( dataX.size() <= 1 )
 return;

 if( m_updateRequired )
 {
 m_coords.x = m_trace->s2x( aWindow.p2x( m_dim.x ) );

 // Find the closest point coordinates
 auto maxXIt = std::upper_bound( dataX.begin(), dataX.end(), m_coords.x );
 int maxIdx = maxXIt - dataX.begin();
 int minIdx = maxIdx - 1;

 // Out of bounds checks
 if( minIdx < 0 )
 {
 minIdx = 0;
 maxIdx = 1;
 m_coords.x = dataX[0];
 }
 else if( maxIdx >= (int) dataX.size() )
 {
 maxIdx = dataX.size() - 1;
 minIdx = maxIdx - 1;
 m_coords.x = dataX[maxIdx];
 }

 const double leftX = dataX[minIdx];
 const double rightX = dataX[maxIdx];
 const double leftY = dataY[minIdx];
 const double rightY = dataY[maxIdx];

 // Linear interpolation
 m_coords.y = leftY + ( rightY - leftY ) / ( rightX - leftX ) * ( m_coords.x - leftX );
 m_updateRequired = false;

 // Notify the parent window about the changes
 wxQueueEvent( aWindow.GetParent(), new wxCommandEvent( EVT_SIM_CURSOR_UPDATE ) );
 }
 else
 {
 m_updateRef = true;
 }

 if( m_updateRef )
 {
 UpdateReference();
 m_updateRef = false;
 }

 // Line length in horizontal and vertical dimensions
 const wxPoint cursorPos( aWindow.x2p( m_trace->x2s( m_coords.x ) ),
 aWindow.y2p( m_trace->y2s( m_coords.y ) ) );

 wxCoord leftPx = m_drawOutsideMargins ? 0 : aWindow.GetMarginLeft();
 wxCoord rightPx = m_drawOutsideMargins ? aWindow.GetScrX() :
 aWindow.GetScrX() - aWindow.GetMarginRight();
 wxCoord topPx = m_drawOutsideMargins ? 0 : aWindow.GetMarginTop();
 wxCoord bottomPx = m_drawOutsideMargins ? aWindow.GetScrY() :
 aWindow.GetScrY() - aWindow.GetMarginBottom();

 wxPen pen = GetPen();
 pen.SetStyle( m_continuous ? wxPENSTYLE_SOLID : wxPENSTYLE_LONG_DASH );
 aDC.SetPen( pen );

 if( topPx < cursorPos.y && cursorPos.y < bottomPx )
 aDC.DrawLine( leftPx, cursorPos.y, rightPx, cursorPos.y );

 if( leftPx < cursorPos.x && cursorPos.x < rightPx )
 aDC.DrawLine( cursorPos.x, topPx, cursorPos.x, bottomPx );
}


bool CURSOR::Inside( wxPoint& aPoint )
{
 if( !m_window )
 return false;

 return ( std::abs( (double) aPoint.x -
 m_window->x2p( m_trace->x2s( m_coords.x ) ) ) <= DRAG_MARGIN )
 || ( std::abs( (double) aPoint.y -
 m_window->y2p( m_trace->y2s( m_coords.y ) ) ) <= DRAG_MARGIN );
}


void CURSOR::UpdateReference()
{
 if( !m_window )
 return;

 m_reference.x = m_window->x2p( m_trace->x2s( m_coords.x ) );
 m_reference.y = m_window->y2p( m_trace->y2s( m_coords.y ) );
}


SIM_PLOT_PANEL::SIM_PLOT_PANEL( const wxString& aCommand, wxWindow* parent,
 SIM_PLOT_FRAME* aMainFrame, wxWindowID id, const wxPoint& pos,
 const wxSize& size, long style, const wxString& name )
 : SIM_PANEL_BASE( aCommand, parent, id, pos, size, style, name ),
 m_axis_x( nullptr ),
 m_axis_y1( nullptr ),
 m_axis_y2( nullptr ),
 m_dotted_cp( false ),
 m_masterFrame( aMainFrame )
{
 m_sizer = new wxBoxSizer( wxVERTICAL );
 m_plotWin = new mpWindow( this, wxID_ANY, pos, size, style );

 m_plotWin->LimitView( true );
 m_plotWin->SetMargins( 50, 80, 50, 80 );

 UpdatePlotColors();

 updateAxes();

 // a mpInfoLegend displays le name of traces on the left top panel corner:
 m_legend = new mpInfoLegend( wxRect( 0, 40, 200, 40 ), wxTRANSPARENT_BRUSH );
 m_legend->SetVisible( false );
 m_plotWin->AddLayer( m_legend );

 m_plotWin->EnableDoubleBuffer( true );
 m_plotWin->UpdateAll();

 m_sizer->Add( m_plotWin, 1, wxALL | wxEXPAND, 1 );
 SetSizer( m_sizer );
}


SIM_PLOT_PANEL::~SIM_PLOT_PANEL()
{
 // ~mpWindow destroys all the added layers, so there is no need to destroy m_traces contents
}


void SIM_PLOT_PANEL::updateAxes()
{
 if( m_axis_x )
 return;

 switch( GetType() )
 {
 case ST_AC:
 m_axis_x = new LOG_SCALE<mpScaleXLog>( _( "Frequency" ), wxT( "Hz" ), mpALIGN_BOTTOM );
 m_axis_y1 = new LIN_SCALE<mpScaleY>( _( "Gain" ), wxT( "dBV" ), mpALIGN_LEFT );
 m_axis_y2 = new LIN_SCALE<mpScaleY>( _( "Phase" ), wxT( "\u00B0" ),
 mpALIGN_RIGHT ); // degree sign
 m_axis_y2->SetMasterScale( m_axis_y1 );
 break;

 case ST_DC:
 prepareDCAxes();
 break;

 case ST_NOISE:
 m_axis_x = new LOG_SCALE<mpScaleXLog>( _( "Frequency" ), wxT( "Hz" ), mpALIGN_BOTTOM );
 m_axis_y1 = new mpScaleY( _( "noise [(V or A)^2/Hz]" ), mpALIGN_LEFT );
 break;

 case ST_TRANSIENT:
 m_axis_x = new LIN_SCALE<mpScaleX>( _( "Time" ), wxT( "s" ), mpALIGN_BOTTOM );
 m_axis_y1 = new LIN_SCALE<mpScaleY>( _( "Voltage" ), wxT( "V" ), mpALIGN_LEFT );
 m_axis_y2 = new LIN_SCALE<mpScaleY>( _( "Current" ), wxT( "A" ), mpALIGN_RIGHT );
 m_axis_y2->SetMasterScale( m_axis_y1 );
 break;

 default:
 // suppress warnings
 break;
 }

 if( m_axis_x )
 {
 m_axis_x->SetTicks( false );
 m_axis_x->SetNameAlign ( mpALIGN_BOTTOM );

 m_plotWin->AddLayer( m_axis_x );
 }

 if( m_axis_y1 )
 {
 m_axis_y1->SetTicks( false );
 m_axis_y1->SetNameAlign ( mpALIGN_LEFT );
 m_plotWin->AddLayer( m_axis_y1 );
 }

 if( m_axis_y2 )
 {
 m_axis_y2->SetTicks( false );
 m_axis_y2->SetNameAlign ( mpALIGN_RIGHT );
 m_plotWin->AddLayer( m_axis_y2 );
 }
}

void SIM_PLOT_PANEL::prepareDCAxes()
{
 wxString sim_cmd = getSimCommand().Lower();
 wxString rem;

 if( sim_cmd.StartsWith( ".dc", &rem ) )
 {
 wxChar ch;

 rem.Trim( false );

 try
 {
 ch = rem.GetChar( 0 );
 }
 catch( ... )
 {;}

 switch( ch )
 {
 // Make sure that we have a reliable default (even if incorrectly labeled)
 default:
 case 'v':
 m_axis_x =
 new LIN_SCALE<mpScaleX>( _( "Voltage (swept)" ), wxT( "V" ), mpALIGN_BOTTOM );
 break;
 case 'i':
 m_axis_x =
 new LIN_SCALE<mpScaleX>( _( "Current (swept)" ), wxT( "A" ), mpALIGN_BOTTOM );
 break;
 case 'r':
 m_axis_x = new LIN_SCALE<mpScaleX>( _( "Resistance (swept)" ), wxT( "\u03A9" ),
 mpALIGN_BOTTOM );
 break;
 case 't':
 m_axis_x = new LIN_SCALE<mpScaleX>( _( "Temperature (swept)" ), wxT( "\u00B0C" ),
 mpALIGN_BOTTOM );
 break;
 }

 m_axis_y1 = new LIN_SCALE<mpScaleY>( _( "Voltage (measured)" ), wxT( "V" ), mpALIGN_LEFT );
 m_axis_y2 = new LIN_SCALE<mpScaleY>( _( "Current" ), wxT( "A" ), mpALIGN_RIGHT );
 }
}


void SIM_PLOT_PANEL::UpdatePlotColors()
{
 // Update bg and fg colors:
 m_plotWin->SetColourTheme( m_colors.GetPlotColor( SIM_PLOT_COLORS::COLOR_SET::BACKGROUND ),
 m_colors.GetPlotColor( SIM_PLOT_COLORS::COLOR_SET::FOREGROUND ),
 m_colors.GetPlotColor( SIM_PLOT_COLORS::COLOR_SET::AXIS ) );

 // Update color of all traces
 for( auto& t : m_traces )
 if( t.second->GetCursor() )
 t.second->GetCursor()->SetPen(
 wxPen( m_colors.GetPlotColor( SIM_PLOT_COLORS::COLOR_SET::CURSOR ) ) );

 m_plotWin->UpdateAll();
}


void SIM_PLOT_PANEL::UpdateTraceStyle( TRACE* trace )
{
 int type = trace->GetType();
 wxPenStyle penStyle = ( ( ( type & SPT_AC_PHASE ) || ( type & SPT_CURRENT ) ) && m_dotted_cp )
 ? wxPENSTYLE_DOT
 : wxPENSTYLE_SOLID;
 trace->SetPen( wxPen( trace->GetTraceColour(), 2, penStyle ) );
}


bool SIM_PLOT_PANEL::addTrace( const wxString& aTitle, const wxString& aName, int aPoints,
 const double* aX, const double* aY, SIM_PLOT_TYPE aType,
 const wxString& aParam )
{
 TRACE* trace = nullptr;
 wxString name = aTitle;

 updateAxes();

 // Find previous entry, if there is one
 auto prev = m_traces.find( name );
 bool addedNewEntry = ( prev == m_traces.end() );

 if( addedNewEntry )
 {
 if( GetType() == ST_TRANSIENT )
 {
 bool hasVoltageTraces = false;

 for( const auto& tr : m_traces )
 {
 if( !( tr.second->GetType() & SPT_CURRENT ) )
 {
 hasVoltageTraces = true;
 break;
 }
 }

 if( !hasVoltageTraces )
 m_axis_y2->SetMasterScale( nullptr );
 else
 m_axis_y2->SetMasterScale( m_axis_y1 );
 }

 // New entry
 trace = new TRACE( aName, aType, aParam );
 trace->SetTraceColour( m_colors.GenerateColor( m_traces ) );
 UpdateTraceStyle( trace );
 m_traces[name] = trace;

 // It is a trick to keep legend & coords always on the top
 for( mpLayer* l : m_topLevel )
 m_plotWin->DelLayer( l );

 m_plotWin->AddLayer( (mpLayer*) trace );

 for( mpLayer* l : m_topLevel )
 m_plotWin->AddLayer( l );
 }
 else
 {
 trace = prev->second;
 }

 std::vector<double> tmp( aY, aY + aPoints );

 if( GetType() == ST_AC )
 {
 if( aType & SPT_AC_PHASE )
 {
 for( int i = 0; i < aPoints; i++ )
 tmp[i] = tmp[i] * 180.0 / M_PI; // convert to degrees
 }
 else
 {
 for( int i = 0; i < aPoints; i++ )
 {
 // log( 0 ) is not valid.
 if( tmp[i] != 0 )
 tmp[i] = 20 * log( tmp[i] ) / log( 10.0 ); // convert to dB
 }
 }
 }

 trace->SetData( std::vector<double>( aX, aX + aPoints ), tmp );

 if( ( aType & SPT_AC_PHASE ) || ( aType & SPT_CURRENT ) )
 trace->SetScale( m_axis_x, m_axis_y2 );
 else
 trace->SetScale( m_axis_x, m_axis_y1 );

 m_plotWin->UpdateAll();

 return addedNewEntry;
}


bool SIM_PLOT_PANEL::deleteTrace( const wxString& aName )
{
 auto it = m_traces.find( aName );

 if( it != m_traces.end() )
 {
 TRACE* trace = it->second;
 m_traces.erase( it );

 if( CURSOR* cursor = trace->GetCursor() )
 m_plotWin->DelLayer( cursor, true );

 m_plotWin->DelLayer( trace, true, true );
 ResetScales();

 return true;
 }

 return false;
}


void SIM_PLOT_PANEL::deleteAllTraces()
{
 for( auto& t : m_traces )
 {
 deleteTrace( t.first );
 }

 m_traces.clear();
}


bool SIM_PLOT_PANEL::HasCursorEnabled( const wxString& aName ) const
{
 TRACE* t = GetTrace( aName );

 return t ? t->HasCursor() : false;
}


void SIM_PLOT_PANEL::EnableCursor( const wxString& aName, bool aEnable )
{
 TRACE* t = GetTrace( aName );

 if( t == nullptr || t->HasCursor() == aEnable )
 return;

 if( aEnable )
 {
 CURSOR* c = new CURSOR( t, this );
 int plotCenter = GetPlotWin()->GetMarginLeft()
 + ( GetPlotWin()->GetXScreen() - GetPlotWin()->GetMarginLeft()
 - GetPlotWin()->GetMarginRight() )
 / 2;
 c->SetX( plotCenter );
 c->SetPen( wxPen( m_colors.GetPlotColor( SIM_PLOT_COLORS::COLOR_SET::CURSOR ) ) );
 t->SetCursor( c );
 m_plotWin->AddLayer( c );
 }
 else
 {
 CURSOR* c = t->GetCursor();
 t->SetCursor( nullptr );
 m_plotWin->DelLayer( c, true );
 }

 // Notify the parent window about the changes
 wxQueueEvent( GetParent(), new wxCommandEvent( EVT_SIM_CURSOR_UPDATE ) );
}


void SIM_PLOT_PANEL::ResetScales()
{
 if( m_axis_x )
 m_axis_x->ResetDataRange();

 if( m_axis_y1 )
 m_axis_y1->ResetDataRange();

 if( m_axis_y2 )
 m_axis_y2->ResetDataRange();

 for( auto t : m_traces )
 t.second->UpdateScales();
}


wxDEFINE_EVENT( EVT_SIM_CURSOR_UPDATE, wxCommandEvent );