//============================================================================ // // KRotation screen saver for KDE // // The screen saver displays a physically realistic simulation of a force free // rotating asymmetric body. The equations of motion for such a rotation, the // Euler equations, are integrated numerically by the Runge-Kutta method. // // Developed by Georg Drenkhahn, georg-d@users.sourceforge.net // // $Id$ // /* * Copyright (C) 2004 Georg Drenkhahn * * KRotation is free software; you can redistribute it and/or modify it under * the terms of the GNU General Public License version 2 as published by the * Free Software Foundation. * * KRotation 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, write to the Free Software Foundation, Inc., 59 Temple * Place, Suite 330, Boston, MA 02110-1301 USA */ //============================================================================ // std. C++ headers #include // STL #include // Qt headers #include #include #include #include // KDE headers #include #include #include #include #include "sspreviewarea.h" // rotation.moc includes rotation.h #include "rotation.moc" /** Version number of this screen saver */ #define KROTATION_VERSION "1.1" // libkscreensaver interface extern "C" { /** application name for the libkscreensaver interface */ KDE_EXPORT const char *kss_applicationName = "krotation.kss"; /** application description for the libkscreensaver interface */ KDE_EXPORT const char *kss_description = I18N_NOOP("Simulation of a force free rotating asymmetric body"); /** application version for the libkscreensaver interface */ KDE_EXPORT const char *kss_version = KROTATION_VERSION; /** function to create screen saver object */ KDE_EXPORT KScreenSaver* kss_create(WId id) { return new KRotationSaver(id); } /** function to create setup dialog for screen saver */ KDE_EXPORT TQDialog* kss_setup() { return new KRotationSetup(); } } //----------------------------------------------------------------------------- // EulerOdeSolver implementation //----------------------------------------------------------------------------- EulerOdeSolver::EulerOdeSolver( const double &t_, const double &dt_, const double &A_, const double &B_, const double &C_, std::valarray &y_, const double &eps_) : RkOdeSolver(t_,y_,dt_,eps_), A(A_), B(B_), C(C_) { } std::valarray EulerOdeSolver::f( const double &x, const std::valarray &y) const { // unused (void)x; // vec omega in body coor. sys.: omega_body = (p, q, r) const vec3 omega_body(y[std::slice(0,3,1)]); // body unit vectors in fixed frame coordinates const vec3 e1(y[std::slice(3,3,1)]); const vec3 e2(y[std::slice(6,3,1)]); const vec3 e3(y[std::slice(9,3,1)]); // don't use "const vec3&" here because slice_array must be // value-copied to vec3. // vec omega in global fixed coor. sys. vec3 omega( omega_body[0] * e1 + omega_body[1] * e2 + omega_body[2] * e3); // return vector y' std::valarray ypr(y.size()); // omega_body' ypr[0] = -(C-B)/A * omega_body[1] * omega_body[2]; // p' ypr[1] = -(A-C)/B * omega_body[2] * omega_body[0]; // q' ypr[2] = -(B-A)/C * omega_body[0] * omega_body[1]; // r' // e1', e2', e3' ypr[std::slice(3,3,1)] = vec3::crossprod(omega, e1); ypr[std::slice(6,3,1)] = vec3::crossprod(omega, e2); ypr[std::slice(9,3,1)] = vec3::crossprod(omega, e3); return ypr; } //----------------------------------------------------------------------------- //----------------------------------------------------------------------------- // Rotation: screen saver widget //----------------------------------------------------------------------------- RotationGLWidget::RotationGLWidget( TQWidget* parent, const char* name, const vec3& _omega, const std::deque >& e1_, const std::deque >& e2_, const std::deque >& e3_, const vec3& J) : TQGLWidget(parent, name), eyeR(25), eyeTheta(1), eyePhi(M_PI*0.25), boxSize(1,1,1), fixedAxses(0), bodyAxses(0), lightR(10), lightTheta(M_PI/4), lightPhi(0), bodyAxsesLength(6), fixedAxsesLength(8), omega(_omega), e1(e1_), e2(e2_), e3(e3_) { // set up initial rotation matrix as unit matrix, only non-constant elements // are set later on for (int i=0; i<16; i++) rotmat[i] = ((i%5)==0) ? 1:0; // Set the box sizes from the momenta of inertia. J is the 3 vector with // momenta of inertia with respect to the 3 figure axes. // the default values must be valid so that w,h,d are real! GLfloat x2 = 6.0*(-J[0] + J[1] + J[2]), y2 = 6.0*( J[0] - J[1] + J[2]), z2 = 6.0*( J[0] + J[1] - J[2]); if (x2>=0 && y2>=0 && z2>=0) { boxSize = vec3(sqrt(x2), sqrt(y2), sqrt(z2)); } else { kdDebug() << "parameter error" << endl; boxSize = vec3(1, 1, 1); } } /* --------- protected methods ----------- */ void RotationGLWidget::initializeGL(void) { qglClearColor(TQColor(black)); // set color to clear the background glClearDepth(1); // depth buffer setup glEnable(GL_DEPTH_TEST); // depth testing glDepthFunc(GL_LEQUAL); // type of depth test glShadeModel(GL_SMOOTH); // smooth color shading in poygons // nice perspective calculation glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST); // set up the light glEnable(GL_LIGHTING); glEnable(GL_LIGHT0); // set positon of light0 GLfloat lightPos[4]= {lightR * sin(lightTheta) * sin(lightPhi), lightR * sin(lightTheta) * cos(lightPhi), lightR * cos(lightTheta), 1.}; glLightfv(GL_LIGHT0, GL_POSITION, lightPos); // enable setting the material colour by glColor() glEnable(GL_COLOR_MATERIAL); // set up display lists if (fixedAxses == 0) fixedAxses = glGenLists(1); // list to be returned glNewList(fixedAxses, GL_COMPILE); // fixed coordinate system axes glPushMatrix(); glLoadIdentity(); // z-axis, blue qglColor(TQColor(blue)); myGlArrow(fixedAxsesLength, 0.5f, 0.03f, 0.1f); // x-axis, red qglColor(TQColor(red)); glRotatef(90, 0, 1, 0); myGlArrow(fixedAxsesLength, 0.5f, 0.03f, 0.1f); // y-axis, green qglColor(TQColor(green)); glLoadIdentity(); glRotatef(-90, 1, 0, 0); myGlArrow(fixedAxsesLength, 0.5f, 0.03f, 0.1f); glPopMatrix(); glEndList(); // end of axes object list // box and box-axses if (bodyAxses == 0) bodyAxses = glGenLists(1); // list to be returned glNewList(bodyAxses, GL_COMPILE); // z-axis, blue qglColor(TQColor(blue)); myGlArrow(bodyAxsesLength, 0.5f, 0.03f, 0.1f); // x-axis, red qglColor(TQColor(red)); glPushMatrix(); glRotatef(90, 0, 1, 0); myGlArrow(bodyAxsesLength, 0.5f, 0.03f, 0.1f); glPopMatrix(); // y-axis, green qglColor(TQColor(green)); glPushMatrix(); glRotatef(-90, 1, 0, 0); myGlArrow(bodyAxsesLength, 0.5f, 0.03f, 0.1f); glPopMatrix(); glEndList(); } void RotationGLWidget::draw_traces(void) { if (e1.size()==0 && e2.size()==0 && e3.size()==0) return; glPushMatrix(); glScalef(bodyAxsesLength, bodyAxsesLength, bodyAxsesLength); glEnable(GL_BLEND); glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); for (int j=0; j<3; ++j) { const std::deque >& e = j==0 ? e1 : j==1 ? e2 : e3; // trace must contain at least 2 elements if (e.size() > 1) { // emission colour GLfloat em[4] = {0,0,0,1}; em[j] = 1; // set either red, green, blue emission colour glMaterialfv(GL_FRONT_AND_BACK, GL_EMISSION, em); glColor4fv(em); // set iterator of the tail part std::deque >::const_iterator eit = e.begin(); std::deque >::const_iterator tail = e.begin() + static_cast >::difference_type> (0.9*e.size()); glBegin(GL_LINES); for (; eit < e.end()-1; ++eit) { glVertex3f((*eit)[0], (*eit)[1], (*eit)[2]); // decrease transparency for tail section if (eit > tail) em[3] = static_cast (1.0 - double(eit-tail)/(0.1*e.size())); glColor4fv(em); glMaterialfv(GL_FRONT_AND_BACK, GL_EMISSION, em); glVertex3f((*(eit+1))[0], (*(eit+1))[1], (*(eit+1))[2]); } glEnd(); } } glDisable(GL_BLEND); glPopMatrix(); } void RotationGLWidget::paintGL(void) { // clear color and depth buffer glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT); glMatrixMode(GL_MODELVIEW); // select modelview matrix glLoadIdentity(); GLfloat const em[] = {0,0,0,1}; glMaterialfv(GL_FRONT_AND_BACK, GL_EMISSION, em); // omega vector vec3 rotvec = vec3::crossprod(vec3(0,0,1), omega).normalize(); GLfloat rotdeg = 180./M_PI * vec3::angle(vec3(0,0,1), omega); glPushMatrix(); glRotatef(rotdeg, rotvec[0], rotvec[1], rotvec[2]); qglColor(TQColor(white)); myGlArrow(7, .5f, .1f, 0.2f); glPopMatrix(); // fixed axes glCallList(fixedAxses); glPushMatrix(); // set up variable part of rotation matrix for body // set gl body rotation matrix from e1,e2,e3 const vec3& e1b = e1.front(); const vec3& e2b = e2.front(); const vec3& e3b = e3.front(); rotmat[0] = e1b[0]; rotmat[1] = e1b[1]; rotmat[2] = e1b[2]; rotmat[4] = e2b[0]; rotmat[5] = e2b[1]; rotmat[6] = e2b[2]; rotmat[8] = e3b[0]; rotmat[9] = e3b[1]; rotmat[10] = e3b[2]; glMultMatrixf(rotmat); glCallList(bodyAxses); glScalef(boxSize[0]/2, boxSize[1]/2, boxSize[2]/2); // paint box glBegin(GL_QUADS); // front (z) qglColor(TQColor(blue)); glNormal3f( 0,0,1); glVertex3f( 1, 1, 1); glVertex3f(-1, 1, 1); glVertex3f(-1, -1, 1); glVertex3f( 1, -1, 1); // back (-z) glNormal3f( 0,0,-1); glVertex3f( 1, 1, -1); glVertex3f(-1, 1, -1); glVertex3f(-1, -1, -1); glVertex3f( 1, -1, -1); // top (y) qglColor(TQColor(green)); glNormal3f( 0,1,0); glVertex3f( 1, 1, 1); glVertex3f( 1, 1, -1); glVertex3f(-1, 1, -1); glVertex3f(-1, 1, 1); // bottom (-y) glNormal3f( 0,-1,0); glVertex3f( 1, -1, 1); glVertex3f( 1, -1, -1); glVertex3f(-1, -1, -1); glVertex3f(-1, -1, 1); // left (-x) qglColor(TQColor(red)); glNormal3f( -1,0,0); glVertex3f(-1, 1, 1); glVertex3f(-1, 1, -1); glVertex3f(-1, -1, -1); glVertex3f(-1, -1, 1); // right (x) glNormal3f( 1,0,0); glVertex3f( 1, 1, 1); glVertex3f( 1, 1, -1); glVertex3f( 1, -1, -1); glVertex3f( 1, -1, 1); glEnd(); // traces glPopMatrix(); draw_traces (); glFlush(); } void RotationGLWidget::resizeGL(int w, int h) { // Prevent a divide by zero if (h == 0) h = 1; // set the new view port glViewport(0, 0, (GLint)w, (GLint)h); // set up projection matrix glMatrixMode(GL_PROJECTION); glLoadIdentity(); // Perspective view gluPerspective(40.0f, (GLdouble)w/(GLdouble)h, 1.0, 100.0f); // Viewing transformation, position for better view // Theta is polar angle 0show(); // show gl widget timer = new TQTimer(this); timer->start(deltaT, TRUE); connect(timer, TQT_SIGNAL(timeout()), this, TQT_SLOT(doTimeStep())); } KRotationSaver::~KRotationSaver() { // time, rotation are automatically deleted with parent KRotationSaver delete solver; } void KRotationSaver::initData() { // reset coordiante system vec3 e1t(1,0,0), e2t(0,1,0), e3t(0,0,1); // rotation by phi around z = zhat axis e1t.rotate(initEulerPhi*e3t); e2t.rotate(initEulerPhi*e3t); // rotation by theta around new x axis e2t.rotate(m_initEulerTheta*e1t); e3t.rotate(m_initEulerTheta*e1t); // rotation by psi around new z axis e1t.rotate(initEulerPsi*e3t); e2t.rotate(initEulerPsi*e3t); // set first vector in deque e1.clear(); e1.push_front(e1t); e2.clear(); e2.push_front(e2t); e3.clear(); e3.push_front(e3t); // calc L in body frame: 1. determine z-axis of fixed frame in body // coordinates, undo the transformations for unit z vector of the body frame // calc omega_body from ... vec3 e1_body(1,0,0), e3_body(0,0,1); // rotation by -psi along z axis e1_body.rotate(-initEulerPsi*e3_body); // rotation by -theta along new x axis e3_body.rotate(-m_initEulerTheta*e1_body); // omega_body = L_body * J_body^(-1) vec3 omega_body = e3_body * m_Lz; omega_body /= J; // assemble initial y for solver std::valarray y(12); y[std::slice(0,3,1)] = omega_body; // 3 basis vectors of body system in fixed coordinates y[std::slice(3,3,1)] = e1t; y[std::slice(6,3,1)] = e2t; y[std::slice(9,3,1)] = e3t; // initial rotation vector omega = omega_body[0]*e1t + omega_body[1]*e2t + omega_body[2]*e3t; if (solver!=0) delete solver; // init solver solver = new EulerOdeSolver( 0.0, // t 0.01, // first dt step size estimation J[0], J[1], J[2], // A,B,C y, // omega_body,e1,e2,e3 1e-5); // eps } void KRotationSaver::readSettings() { // read configuration settings from config file KConfig *config = KGlobal::config(); config->setGroup("Settings"); // internal saver parameters are set to stored values or left at their // default values if stored values are out of range setTraceFlag(0, config->readBoolEntry("x trace", traceFlagDefault[0])); setTraceFlag(1, config->readBoolEntry("y trace", traceFlagDefault[1])); setTraceFlag(2, config->readBoolEntry("z trace", traceFlagDefault[2])); setRandomTraces(config->readBoolEntry("random traces", randomTracesDefault)); setTraceLengthSeconds( config->readDoubleNumEntry("length", traceLengthSecondsDefault)); setLz( config->readDoubleNumEntry("Lz", LzDefault)); setInitEulerTheta( config->readDoubleNumEntry("theta", initEulerThetaDefault)); } void KRotationSaver::setTraceLengthSeconds(const double& t) { if (t >= traceLengthSecondsLimitLower && t <= traceLengthSecondsLimitUpper) { m_traceLengthSeconds = t; } } const double KRotationSaver::traceLengthSecondsLimitLower = 0.0; const double KRotationSaver::traceLengthSecondsLimitUpper = 99.0; const double KRotationSaver::traceLengthSecondsDefault = 3.0; const bool KRotationSaver::traceFlagDefault[3] = {false, false, true}; void KRotationSaver::setLz(const double& Lz) { if (Lz >= LzLimitLower && Lz <= LzLimitUpper) { m_Lz = Lz; } } const double KRotationSaver::LzLimitLower = 0.0; const double KRotationSaver::LzLimitUpper = 500.0; const double KRotationSaver::LzDefault = 10.0; void KRotationSaver::setInitEulerTheta(const double& theta) { if (theta >= initEulerThetaLimitLower && theta <= initEulerThetaLimitUpper) { m_initEulerTheta = theta; } } const double KRotationSaver::initEulerThetaLimitLower = 0.0; const double KRotationSaver::initEulerThetaLimitUpper = 180.0; const double KRotationSaver::initEulerThetaDefault = 0.03; // public slots void KRotationSaver::doTimeStep() { // integrate a step ahead solver->integrate(0.001*deltaT); // read new y std::valarray y = solver->Y(); std::deque >::size_type max_vec_length = static_cast >::size_type> ( m_traceLengthSeconds/(0.001*deltaT) ); for (int j=0; j<3; ++j) { std::deque >& e = j==0 ? e1 : j==1 ? e2 : e3; // read out new body coordinate system if (m_traceFlag[j] == true && max_vec_length > 0) { e.push_front(y[std::slice(3*j+3, 3, 1)]); while (e.size() > max_vec_length) { e.pop_back(); } } else { // only set the 1. element e.front() = y[std::slice(3*j+3, 3, 1)]; // and delete all other emements if (e.size() > 1) e.resize(1); } } // current rotation vector omega omega = y[0]*e1.front() + y[1]*e2.front() + y[2]*e3.front(); // set new random traces every 10 seconds if (m_randomTraces==true) { static unsigned int counter=0; ++counter; if (counter > unsigned(10.0/(0.001*deltaT))) { counter=0; for (int i=0; i<3; ++i) m_traceFlag[i] = rand()%2==1 ? true : false; } } glArea->updateGL(); timer->start(deltaT, TRUE); // restart timer } // public slot of KRotationSaver, forward resize event to public slot of glArea // to allow the resizing of the gl area withing the setup dialog void KRotationSaver::resizeGlArea(TQResizeEvent* e) { glArea->resize(e->size()); } //----------------------------------------------------------------------------- // KRotationSetup: dialog to setup screen saver parameters //----------------------------------------------------------------------------- KRotationSetup::KRotationSetup(TQWidget* parent, const char* name) : KRotationSetupUi(parent, name), // create ssaver and give it the WinID of the preview area saver(new KRotationSaver(preview->winId())) { // the dialog should block, no other control center input should be possible // until the dialog is closed setModal(TRUE); lengthEdit->setValidator( new TQDoubleValidator( KRotationSaver::traceLengthSecondsLimitLower, KRotationSaver::traceLengthSecondsLimitUpper, 3, lengthEdit)); LzEdit->setValidator( new TQDoubleValidator( KRotationSaver::LzLimitLower, KRotationSaver::LzLimitUpper, 3, LzEdit)); thetaEdit->setValidator( new TQDoubleValidator( KRotationSaver::initEulerThetaLimitLower, KRotationSaver::initEulerThetaLimitUpper, 3, thetaEdit)); // set tool tips of editable fields TQToolTip::add( lengthEdit, i18n("Length of traces in seconds of visibility.\nValid values from %1 to %2.") .arg(KRotationSaver::traceLengthSecondsLimitLower, 0, 'f', 2) .arg(KRotationSaver::traceLengthSecondsLimitUpper, 0, 'f', 2)); TQToolTip::add( LzEdit, i18n("Angular momentum in z direction in arbitrary units.\nValid values from %1 to %2.") .arg(KRotationSaver::LzLimitLower, 0, 'f', 2) .arg(KRotationSaver::LzLimitUpper, 0, 'f', 2)); TQToolTip::add( thetaEdit, i18n("Gravitational constant in arbitrary units.\nValid values from %1 to %2.") .arg(KRotationSaver::initEulerThetaLimitLower, 0, 'f', 2) .arg(KRotationSaver::initEulerThetaLimitUpper, 0, 'f', 2)); // init preview area preview->setBackgroundColor(black); preview->show(); // otherwise saver does not get correct size // read settings from saver and update GUI elements with these values, saver // has read settings in its constructor // set editable fields with stored values as defaults xTrace->setChecked(saver->traceFlag(0)); yTrace->setChecked(saver->traceFlag(1)); zTrace->setChecked(saver->traceFlag(2)); randTraces->setChecked(saver->randomTraces()); TQString text; text.setNum(saver->traceLengthSeconds()); lengthEdit->validateAndSet(text,0,0,0); text.setNum(saver->Lz()); LzEdit->validateAndSet(text,0,0,0); text.setNum(saver->initEulerTheta()); thetaEdit->validateAndSet(text,0,0,0); // if the preview area is resized it emmits the resized() event which is // caught by the saver. The embedded GlArea is resized to fit into the // preview area. connect(preview, TQT_SIGNAL(resized(TQResizeEvent*)), saver, TQT_SLOT(resizeGlArea(TQResizeEvent*))); } KRotationSetup::~KRotationSetup() { delete saver; } // Ok pressed - save settings and exit void KRotationSetup::okButtonClickedSlot(void) { KConfig* config = KGlobal::config(); config->setGroup("Settings"); config->writeEntry("x trace", saver->traceFlag(0)); config->writeEntry("y trace", saver->traceFlag(1)); config->writeEntry("z trace", saver->traceFlag(2)); config->writeEntry("random traces", saver->randomTraces()); config->writeEntry("length", saver->traceLengthSeconds()); config->writeEntry("Lz", saver->Lz()); config->writeEntry("theta", saver->initEulerTheta()); config->sync(); accept(); } void KRotationSetup::aboutButtonClickedSlot(void) { KMessageBox::about(this, i18n("\

KRotation Screen Saver for KDE

\

Simulation of a force free rotating asymmetric body

\

Copyright (c) Georg Drenkhahn 2004

\

georg-d@users.sourceforge.net

")); } void KRotationSetup::xTraceToggled(bool state) { saver->setTraceFlag(0, state); } void KRotationSetup::yTraceToggled(bool state) { saver->setTraceFlag(1, state); } void KRotationSetup::zTraceToggled(bool state) { saver->setTraceFlag(2, state); } void KRotationSetup::randomTracesToggled(bool state) { saver->setRandomTraces(state); if (state==false) { // restore settings from gui if random traces are turned off saver->setTraceFlag(0, xTrace->isChecked()); saver->setTraceFlag(1, yTrace->isChecked()); saver->setTraceFlag(2, zTrace->isChecked()); } } void KRotationSetup::lengthEnteredSlot(const TQString& s) { saver->setTraceLengthSeconds(s.toDouble()); } void KRotationSetup::LzEnteredSlot(const TQString& s) { saver->setLz(s.toDouble()); if (saver!=0) saver->initData(); } void KRotationSetup::thetaEnteredSlot(const TQString& s) { saver->setInitEulerTheta(s.toDouble()); if (saver!=0) saver->initData(); }