From 5de3dd4762ca33a0f92e79ffa4fe2ff67069d531 Mon Sep 17 00:00:00 2001
From: tpearson <tpearson@283d02a7-25f6-0310-bc7c-ecb5cbfe19da>
Date: Wed, 24 Feb 2010 01:49:02 +0000
Subject: Added KDE3 version of ktechlab

git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/applications/ktechlab@1095338 283d02a7-25f6-0310-bc7c-ecb5cbfe19da
---
 src/electronics/switch.cpp | 221 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 221 insertions(+)
 create mode 100644 src/electronics/switch.cpp

(limited to 'src/electronics/switch.cpp')

diff --git a/src/electronics/switch.cpp b/src/electronics/switch.cpp
new file mode 100644
index 0000000..7cbda70
--- /dev/null
+++ b/src/electronics/switch.cpp
@@ -0,0 +1,221 @@
+/***************************************************************************
+ *   Copyright (C) 2005 by David Saxton                                    *
+ *   david@bluehaze.org                                                    *
+ *                                                                         *
+ *   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.                                   *
+ ***************************************************************************/
+
+#include "circuitdocument.h"
+#include "component.h"
+#include "ecnode.h"
+#include "pin.h"
+#include "resistance.h"
+#include "simulator.h"
+#include "switch.h"
+
+#include <kdebug.h>
+#include <qtimer.h>
+
+#include <cmath>
+#include <stdlib.h> // for rand
+#include <time.h>
+
+Switch::Switch( Component * parent, Pin * p1, Pin * p2, State state )
+{
+	m_bouncePeriod_ms = 5;
+	m_bBounce = false;
+	m_bounceStart = 0;
+	m_pBounceResistance = 0l;
+	m_pP1 = p1;
+	m_pP2 = p2;
+	m_pComponent = parent;
+	m_pStopBouncingTimer = new QTimer( this );
+	connect( m_pStopBouncingTimer, SIGNAL(timeout()), this, SLOT(stopBouncing()) );
+	
+	// Force update
+	m_state = (state == Open) ? Closed : Open;
+	setState(state);
+}
+
+
+Switch::~ Switch( )
+{
+	if (m_pP1)
+		m_pP1->setSwitchConnected( m_pP2, false );
+	
+	if (m_pP2)
+		m_pP2->setSwitchConnected( m_pP1, false );
+}
+
+
+void Switch::setState( State state )
+{
+	if ( m_state == state )
+		return;
+	
+	m_state = state;
+	
+	if ( m_bBounce )
+		startBouncing();
+	else
+	{
+		// I'm being lazy...calling stopBouncing will connect the stuff
+		stopBouncing();
+	}
+}
+
+
+void Switch::setBounce( bool bounce, int msec )
+{
+	m_bBounce = bounce;
+	m_bouncePeriod_ms = msec;
+}
+
+
+void Switch::startBouncing()
+{
+	if ( m_pBounceResistance )
+	{
+		// Already active?
+		return;
+	}
+	
+	CircuitDocument * cd = m_pComponent->circuitDocument();
+	if ( !cd )
+		return;
+	
+// 	kdDebug() << k_funcinfo << endl;
+	
+	m_pBounceResistance = m_pComponent->createResistance( m_pP1, m_pP2, 10000 );
+	m_bounceStart = Simulator::self()->time();
+	Simulator::self()->attachSwitch( this );
+// 	kdDebug() << "m_bounceStart="<<m_bounceStart<<" m_bouncePeriod_ms="<<m_bouncePeriod_ms<<endl;
+	
+	// initialize random generator
+	srand ( time(NULL) );
+	
+	// Give our bounce resistor an initial value
+	bounce();
+}
+
+
+void Switch::bounce()
+{
+	int bounced_ms = (( Simulator::self()->time() - m_bounceStart ) * 1000) / LOGIC_UPDATE_RATE;
+	if ( bounced_ms >= m_bouncePeriod_ms )
+	{
+		if ( !m_pStopBouncingTimer->isActive() )
+			m_pStopBouncingTimer->start( 0, true );
+		return;
+	}
+	
+	double g = double(rand())/double(RAND_MAX);
+	
+	// 4th power of the conductance seems to give a nice distribution
+	g = g * g * g * g;
+	
+	m_pBounceResistance->setConductance( g );
+}
+
+
+void Switch::stopBouncing()
+{
+	Simulator::self()->detachSwitch( this );
+	m_pComponent->removeElement( m_pBounceResistance, true );
+	m_pBounceResistance = 0l;
+	
+	bool connected = (m_state == Closed);
+	
+	if ( m_pP1 && m_pP2 )
+	{
+		m_pP1->setSwitchConnected( m_pP2, connected );
+		m_pP2->setSwitchConnected( m_pP1, connected );
+	}
+	
+	if ( CircuitDocument * cd = m_pComponent->circuitDocument() )
+		cd->requestAssignCircuits();
+}
+
+
+bool Switch::calculateCurrent()
+{
+	if ( !m_pP1 || !m_pP2 )
+		return false;
+	
+	if ( state() == Open )
+	{
+		m_pP1->setSwitchCurrentKnown( this );
+		m_pP2->setSwitchCurrentKnown( this );
+		return true;
+	}
+	
+	Pin * pins[2] = { m_pP1, m_pP2 };
+	
+	double current = 0.0;
+	bool currentKnown = false;
+	
+	int pol;
+	for ( unsigned i = 0; i < 2; ++i )
+	{
+		pol = (i == 0) ? 1 : -1;
+		
+		const WireList inputs = pins[i]->inputWireList();
+		const WireList outputs = pins[i]->outputWireList();
+		
+		currentKnown = true;
+		current = 0.0;
+		
+		WireList::const_iterator end = inputs.end();
+		for ( WireList::const_iterator it = inputs.begin(); it != end; ++it )
+		{
+			if ( !(*it) )
+				continue;
+			
+			if ( !(*it)->currentIsKnown() )
+			{
+				currentKnown = false;
+				break;
+			}
+			
+			current += (*it)->current();
+		}
+		
+		if ( !currentKnown )
+			continue;
+		
+		end = outputs.end();
+		for ( WireList::const_iterator it = outputs.begin(); it != end; ++it )
+		{
+			if ( !(*it) )
+				continue;
+			
+			if ( !(*it)->currentIsKnown() )
+			{
+				currentKnown = false;
+				break;
+			}
+			
+			current -= (*it)->current();
+		}
+		
+		if ( currentKnown )
+			break;
+	}
+	
+	if ( !currentKnown )
+		return false;
+	
+	m_pP1->setSwitchCurrentKnown( this );
+	m_pP2->setSwitchCurrentKnown( this );
+	m_pP1->mergeCurrent( -current * pol );
+	m_pP2->mergeCurrent( current * pol );
+	
+	return true;
+}
+
+#include "switch.moc"
+
+
-- 
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