Added a rudimentary info panel to the Qt4 interface.
Chris Laurel
parent
a97bc06603
commit
d7520a1880
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// qtcelestiaactions.h
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//
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// Copyright (C) 2008, Celestia Development Team
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// celestia-developers@lists.sourceforge.net
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//
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// Information panel for Qt4 UI.
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License
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// as published by the Free Software Foundation; either version 2
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// of the License, or (at your option) any later version.
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#include "celengine/astro.h"
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#include "celutil/utf8.h"
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#include <QTextBrowser>
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#include "qtinfopanel.h"
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// TODO: This should be moved to astro.cpp
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struct OrbitalElements
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{
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double semimajorAxis;
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double eccentricity;
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double inclination;
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double longAscendingNode;
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double argPericenter;
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double meanAnomaly;
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};
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static void CalculateOsculatingElements(const Orbit& orbit,
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double t,
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double dt,
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OrbitalElements* elements);
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InfoPanel::InfoPanel(const QString& title, QWidget* parent) :
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QDockWidget(title, parent),
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textBrowser(NULL)
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{
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textBrowser = new QTextBrowser(this);
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textBrowser->setOpenExternalLinks(true);
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setWidget(textBrowser);
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}
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InfoPanel::~InfoPanel()
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{
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}
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void InfoPanel::buildInfoPage(Selection sel, double t)
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{
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QString pageText;
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QTextStream stream(&pageText, QIODevice::WriteOnly);
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pageHeader(stream);
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if (sel.body() != NULL)
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{
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buildSolarSystemBodyPage(sel.body(), t, stream);
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}
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else if (sel.star() != NULL)
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{
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buildStarPage(sel.star(), stream);
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}
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else if (sel.deepsky() != NULL)
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{
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buildDSOPage(sel.deepsky(), stream);
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}
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else
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{
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stream << "Error: no object selected!\n";
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}
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pageFooter(stream);
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textBrowser->setHtml(pageText);
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}
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void InfoPanel::pageHeader(QTextStream& stream)
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{
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stream << "<html><head><title>Info</title></head>\n";
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stream << "<body>\n";
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}
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void InfoPanel::pageFooter(QTextStream& stream)
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{
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stream << "</body></html>\n";
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}
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static QString boldText(const QString& s)
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{
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return QString("<b>") + s + QString("</b>");
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}
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static QString anchor(const QString& href, const QString& text)
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{
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return QString("<a href=\"") + href + QString("\">") + text + QString("</a>");
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}
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void InfoPanel::buildSolarSystemBodyPage(const Body* body,
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double t,
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QTextStream& stream)
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{
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stream << "<h1>" << body->getName().c_str() << "</h1><br>\n";
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if (!body->getInfoURL().empty())
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{
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const char* infoURL = body->getInfoURL().c_str();
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stream << tr("Web info: ") << anchor(infoURL, infoURL) << "<br>\n";
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}
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stream << "<br>\n";
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bool isArtificial = body->getClassification() == Body::Spacecraft;
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QString units(tr("km"));
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double radius = body->getRadius();
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if (radius < 1.0)
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{
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units = tr("m");
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radius *= 1000.0;
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}
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//if (body->isEllipsoid())
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if (body->getModel() == InvalidResource)
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stream << boldText(tr("Equatorial radius: "));
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else
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stream << boldText(tr("Size: "));
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stream << radius << " " << units << "<br>";
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#if 0
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if (body->getOblateness() != 0.0f && body->isEllipsoid())
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{
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stream << boldText(tr("Oblateness: ")) << body->getOblateness() << "<br>\n";
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}
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#endif
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double orbitalPeriod = 0.0;
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if (body->getOrbit()->isPeriodic())
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orbitalPeriod = body->getOrbit()->getPeriod();
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// Show rotation information for natural, periodic rotators
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if (body->getRotationModel()->isPeriodic() && !isArtificial)
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{
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double rotPeriod = body->getRotationModel()->getPeriod();
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double dayLength = 0.0;
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if (body->getOrbit()->isPeriodic())
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{
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double siderealDaysPerYear = orbitalPeriod / rotPeriod;
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double solarDaysPerYear = siderealDaysPerYear - 1.0;
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if (solarDaysPerYear > 0.0001)
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{
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dayLength = orbitalPeriod / (siderealDaysPerYear - 1.0);
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}
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}
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if (rotPeriod < 2.0)
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{
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rotPeriod *= 24.0;
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dayLength *= 24.0;
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units = tr("hours");
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}
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else
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{
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units = tr("days");
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}
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stream << boldText(tr("Sidereal rotation period: ")) << rotPeriod << " " << units << "<br>\n";
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if (dayLength != 0.0)
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{
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stream << boldText(tr("Length of day: ")) << dayLength << " " << units << "<br>\n";
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}
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}
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// Orbit information
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if (orbitalPeriod != 0.0)
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{
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OrbitalElements elements;
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CalculateOsculatingElements(*body->getOrbit(),
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t,
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orbitalPeriod * 1.0e-6,
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&elements);
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if (orbitalPeriod < 365.25 * 2.0)
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{
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units = tr("days");
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}
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else
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{
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units = tr("years");
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orbitalPeriod /= 365.25;
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}
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stream << "<br><big><b>" << tr("Orbit information") << "</b></big><br>\n";
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stream << tr("Osculating elements for") << " " << astro::TDBtoUTC(t).toCStr() << "<br>\n";
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stream << "<i>[ Orbit reference plane info goes here ]</i><br>\n";
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stream << boldText(tr("Period: ")) << orbitalPeriod << " " << units << "<br>\n";
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double sma = elements.semimajorAxis;
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if (sma > 2.5e7)
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{
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units = tr("AU");
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sma = astro::kilometersToAU(sma);
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}
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else
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{
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units = tr("km");
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}
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stream << boldText(tr("Semi-major axis: ")) << sma << " " << units << "<br>\n";
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stream << boldText(tr("Eccentricity: ")) << elements.eccentricity << "<br>\n";
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stream << boldText(tr("Inclination: ")) << radToDeg(elements.inclination) << QString::fromUtf8(UTF8_DEGREE_SIGN) << "<br>\n";
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stream << boldText(tr("Pericenter distance: ")) << sma * (1 - elements.eccentricity) << " " << units << "<br>\n";
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stream << boldText(tr("Apocenter distance: ")) << sma * (1 + elements.eccentricity) << " " << units << "<br>\n";
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}
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}
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void InfoPanel::buildStarPage(const Star* star, QTextStream& stream)
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{
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}
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void InfoPanel::buildDSOPage(const DeepSkyObject* dso, QTextStream& stream)
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{
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}
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static void StateVectorToElements(const Point3d& position,
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const Vec3d& v,
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double GM,
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OrbitalElements* elements)
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{
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Vec3d R = position - Point3d(0.0, 0.0, 0.0);
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Vec3d L = R ^ v;
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double magR = R.length();
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double magL = L.length();
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double magV = v.length();
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L *= (1.0 / magL);
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Vec3d W = L ^ (R / magR);
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// Compute the semimajor axis
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double a = 1.0 / (2.0 / magR - square(magV) / GM);
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// Compute the eccentricity
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double p = square(magL) / GM;
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double q = R * v;
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double ex = 1.0 - magR / a;
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double ey = q / sqrt(a * GM);
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double e = sqrt(ex * ex + ey * ey);
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// Compute the mean anomaly
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double E = atan2(ey, ex);
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double M = E - e * sin(E);
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// Compute the inclination
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double cosi = L * Vec3d(0, 1.0, 0);
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double i = 0.0;
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if (cosi < 1.0)
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i = acos(cosi);
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// Compute the longitude of ascending node
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double Om = atan2(L.x, L.z);
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// Compute the argument of pericenter
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Vec3d U = R / magR;
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double s_nu = (v * U) * sqrt(p / GM);
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double c_nu = (v * W) * sqrt(p / GM) - 1;
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s_nu /= e;
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c_nu /= e;
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Vec3d P = U * c_nu - W * s_nu;
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Vec3d Q = U * s_nu + W * c_nu;
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double om = atan2(P.y, Q.y);
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// Compute the period
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double T = 2 * PI * sqrt(cube(a) / GM);
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T = T / 86400.0; // Convert from seconds to days
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elements->semimajorAxis = a;
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elements->eccentricity = e;
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elements->inclination = i;
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elements->longAscendingNode = Om;
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elements->argPericenter = om;
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elements->meanAnomaly = M;
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}
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static void CalculateOsculatingElements(const Orbit& orbit,
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double t,
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double dt,
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OrbitalElements* elements)
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{
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Point3d p0 = orbit.positionAtTime(t - dt);
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Point3d p1 = orbit.positionAtTime(t);
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Point3d p2 = orbit.positionAtTime(t + dt);
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Vec3d v0 = (p1 - p0) / dt;
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Vec3d v1 = (p2 - p1) / dt;
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Vec3d v = (p2 - p0) / (dt * 2);
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double accel = ((v1 - v0) / dt).length();
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Vec3d r = p1 - Point3d(0.0, 0.0, 0.0);
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double GM = accel * (r * r);
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StateVectorToElements(p1, v, GM, elements);
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}
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@ -0,0 +1,41 @@
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// qtcelestiaactions.h
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//
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// Copyright (C) 2008, Celestia Development Team
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// celestia-developers@lists.sourceforge.net
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//
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// Dockable information panel for Qt4 UI.
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License
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// as published by the Free Software Foundation; either version 2
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// of the License, or (at your option) any later version.
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#ifndef _INFOPANEL_H_
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#define _INFOPANEL_H_
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#include <QDockWidget>
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#include <QTextStream>
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#include "celengine/selection.h"
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class QTextBrowser;
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class InfoPanel : public QDockWidget
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{
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public:
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InfoPanel(const QString& title, QWidget* parent);
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~InfoPanel();
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void buildInfoPage(Selection sel, double t);
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private:
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void pageHeader(QTextStream&);
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void pageFooter(QTextStream&);
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void buildSolarSystemBodyPage(const Body* body, double t, QTextStream&);
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void buildStarPage(const Star* star, QTextStream&);
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void buildDSOPage(const DeepSkyObject* dso, QTextStream&);
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public:
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QTextBrowser* textBrowser;
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};
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#endif // _INFOPANEL_H_
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