File indexing completed on 2024-05-05 05:46:05 

0001 /***************************************************************************
0002  *   Copyright (C) 2003-2005 by David Saxton                               *
0003  *   david@bluehaze.org                                                    *
0004  *                                                                         *
0005  *   This program is free software; you can redistribute it and/or modify  *
0006  *   it under the terms of the GNU General Public License as published by  *
0007  *   the Free Software Foundation; either version 2 of the License, or     *
0008  *   (at your option) any later version.                                   *
0009  ***************************************************************************/
0010 
0011 #include "ecsignallamp.h"
0012 #include "ecnode.h"
0013 #include "element.h"
0014 #include "libraryitem.h"
0015 #include "pin.h"
0016 
0017 #include <KLocalizedString>
0018 #include <QPainter>
0019 #include <cmath>
0020 
0021 // TODO: resistance and power rating should be user definable properties.
0022 #define RESISTANCE 100
0023 #define WATTAGE 0.5
0024 // minimal power to create glow. (looks low...)
0025 #define LIGHTUP (WATTAGE / 20)
0026 
0027 Item *ECSignalLamp::construct(ItemDocument *itemDocument, bool newItem, const char *id)
0028 {
0029     return new ECSignalLamp(static_cast<ICNDocument *>(itemDocument), newItem, id);
0030 }
0031 
0032 LibraryItem *ECSignalLamp::libraryItem()
0033 {
0034     return new LibraryItem(QStringList(QString("ec/signal_lamp")), i18n("Signal Lamp"), i18n("Outputs"), "signal_lamp.png", LibraryItem::lit_component, ECSignalLamp::construct);
0035 }
0036 
0037 ECSignalLamp::ECSignalLamp(ICNDocument *icnDocument, bool newItem, const char *id)
0038     : Component(icnDocument, newItem, id ? id : "signal_lamp")
0039 {
0040     m_name = i18n("Signal Lamp");
0041     setSize(-8, -8, 16, 16);
0042 
0043     init1PinLeft();
0044     init1PinRight();
0045 
0046     createResistance(m_pPNode[0], m_pNNode[0], RESISTANCE);
0047 
0048     advanceSinceUpdate = 0;
0049     avgPower = 0.;
0050     m_bDynamicContent = true;
0051 }
0052 
0053 ECSignalLamp::~ECSignalLamp()
0054 {
0055 }
0056 
0057 void ECSignalLamp::stepNonLogic()
0058 {
0059     const double voltage = m_pPNode[0]->pin()->voltage() - m_pNNode[0]->pin()->voltage();
0060     if (advanceSinceUpdate == 0) {
0061         advanceSinceUpdate = 1; // do not try to divide by 0
0062     }
0063     avgPower = fabs(avgPower * 0.99 + (voltage * voltage / RESISTANCE) * 0.01);
0064     ++advanceSinceUpdate;
0065 }
0066 
0067 void ECSignalLamp::drawShape(QPainter &p)
0068 {
0069     initPainter(p);
0070 
0071     int _x = int(x());
0072     int _y = int(y());
0073 
0074     // Calculate the brightness as a linear function of power, bounded below by
0075     // 25 milliWatts and above by 500 milliWatts.
0076     int brightness = (avgPower < LIGHTUP) ? 255 : ((avgPower > WATTAGE) ? 0 : int(255 * (1 - ((avgPower - LIGHTUP) / (WATTAGE - LIGHTUP)))));
0077     advanceSinceUpdate = 0;
0078 
0079     p.setBrush(QColor(255, 255, brightness));
0080     p.drawEllipse(_x - 8, _y - 8, 16, 16);
0081 
0082     int pos = 8 - int(8 * M_SQRT1_2);
0083 
0084     p.drawLine(_x - 8 + pos, _y - 8 + pos, _x + 8 - pos, _y + 8 - pos);
0085     p.drawLine(_x + 8 - pos, _y - 8 + pos, _x - 8 + pos, _y + 8 - pos);
0086 
0087     deinitPainter(p);
0088 }