Warning, file /education/kstars/kstars/skymapevents.cpp was not indexed or was modified since last indexation (in which case cross-reference links may be missing, inaccurate or erroneous).

 /*
     SPDX-FileCopyrightText: 2001 Jason Harris <jharris@30doradus.org>
 
     SPDX-License-Identifier: GPL-2.0-or-later
 */
 
 //This file contains Event handlers for the SkyMap class.
 
 #include "skymap.h"
 
 #include "ksplanetbase.h"
 #include "kspopupmenu.h"
 #include "kstars.h"
 #include "observinglist.h"
 #include "Options.h"
 #include "skyglpainter.h"
 #include "skyqpainter.h"
 #include "printing/simplefovexporter.h"
 #include "skycomponents/skylabeler.h"
 #include "skycomponents/skymapcomposite.h"
 #include "skycomponents/starcomponent.h"
 #include "skycomponents/mosaiccomponent.h"
 #ifdef HAVE_INDI
 #include "skyobjects/mosaictiles.h"
 #endif
 #include "widgets/infoboxwidget.h"
 
 #include <QGestureEvent>
 #include <QStatusBar>
 #include <QToolTip>
 
 void SkyMap::resizeEvent(QResizeEvent *)
 {
     computeSkymap = true; // skymap must be new computed
 
     //FIXME: No equivalent for this line in Qt4 ??
     //  if ( testWState( Qt::WState_AutoMask ) ) updateMask();
 
     // Resize the widget that draws the sky map.
     // FIXME: The resize event doesn't pass to children. Any better way of doing this?
     m_SkyMapDraw->resize(size());
 
     // Resize infoboxes container.
     // FIXME: this is not really pretty. Maybe there are some better way to this???
     m_iboxes->resize(size());
 }
 
 void SkyMap::keyPressEvent(QKeyEvent *e)
 {
     bool arrowKeyPressed(false);
     bool shiftPressed(false);
     float step = 1.0;
     if (e->modifiers() & Qt::ShiftModifier)
     {
         step         = 10.0;
         shiftPressed = true;
     }
 
     //If the DBus resume key is not empty, then DBus processing is
     //paused while we wait for a keypress
     if (!data->resumeKey.isEmpty() && QKeySequence(e->key()) == data->resumeKey)
     {
         //The resumeKey was pressed.  Signal that it was pressed by
         //resetting it to empty; this will break the loop in
         //KStars::waitForKey()
         data->resumeKey = QKeySequence();
         return;
     }
 
     if (m_previewLegend)
     {
         slotCancelLegendPreviewMode();
     }
 
     switch (e->key())
     {
         case Qt::Key_Left:
             if (Options::useAltAz())
             {
                 focus()->setAz(dms(focus()->az().Degrees() - step * MINZOOM / Options::zoomFactor()).reduce());
                 focus()->HorizontalToEquatorial(data->lst(), data->geo()->lat());
             }
             else
             {
                 focus()->setRA(focus()->ra().Hours() + 0.05 * step * MINZOOM / Options::zoomFactor());
                 focus()->EquatorialToHorizontal(data->lst(), data->geo()->lat());
             }
 
             arrowKeyPressed = true;
             slewing         = true;
             break;
 
         case Qt::Key_Right:
             if (Options::useAltAz())
             {
                 focus()->setAz(dms(focus()->az().Degrees() + step * MINZOOM / Options::zoomFactor()).reduce());
                 focus()->HorizontalToEquatorial(data->lst(), data->geo()->lat());
             }
             else
             {
                 focus()->setRA(focus()->ra().Hours() - 0.05 * step * MINZOOM / Options::zoomFactor());
                 focus()->EquatorialToHorizontal(data->lst(), data->geo()->lat());
             }
 
             arrowKeyPressed = true;
             slewing         = true;
             break;
 
         case Qt::Key_Up:
             if (Options::useAltAz())
             {
                 focus()->setAltRefracted(focus()->altRefracted().Degrees() + step * MINZOOM / Options::zoomFactor());
                 if (focus()->alt().Degrees() > 90.0)
                     focus()->setAlt(90.0);
                 focus()->HorizontalToEquatorial(data->lst(), data->geo()->lat());
             }
             else
             {
                 focus()->setDec(focus()->dec().Degrees() + step * MINZOOM / Options::zoomFactor());
                 if (focus()->dec().Degrees() > 90.0)
                     focus()->setDec(90.0);
                 focus()->EquatorialToHorizontal(data->lst(), data->geo()->lat());
             }
 
             arrowKeyPressed = true;
             slewing         = true;
             break;
 
         case Qt::Key_Down:
             if (Options::useAltAz())
             {
                 focus()->setAltRefracted(focus()->altRefracted().Degrees() - step * MINZOOM / Options::zoomFactor());
                 if (focus()->alt().Degrees() < -90.0)
                     focus()->setAlt(-90.0);
                 focus()->HorizontalToEquatorial(data->lst(), data->geo()->lat());
             }
             else
             {
                 focus()->setDec(focus()->dec().Degrees() - step * MINZOOM / Options::zoomFactor());
                 if (focus()->dec().Degrees() < -90.0)
                     focus()->setDec(-90.0);
                 focus()->EquatorialToHorizontal(data->lst(), data->geo()->lat());
             }
 
             arrowKeyPressed = true;
             slewing         = true;
             break;
 
         case Qt::Key_Plus: //Zoom in
         case Qt::Key_Equal:
             zoomInOrMagStep(e->modifiers());
             break;
 
         case Qt::Key_Minus: //Zoom out
         case Qt::Key_Underscore:
             zoomOutOrMagStep(e->modifiers());
             break;
 
         case Qt::Key_0: //center on Sun
             setClickedObject(data->skyComposite()->planet(KSPlanetBase::SUN));
             setClickedPoint(clickedObject());
             slotCenter();
             break;
 
         case Qt::Key_1: //center on Mercury
             setClickedObject(data->skyComposite()->planet(KSPlanetBase::MERCURY));
             setClickedPoint(clickedObject());
             slotCenter();
             break;
 
         case Qt::Key_2: //center on Venus
             setClickedObject(data->skyComposite()->planet(KSPlanetBase::VENUS));
             setClickedPoint(clickedObject());
             slotCenter();
             break;
 
         case Qt::Key_3: //center on Moon
             setClickedObject(data->skyComposite()->planet(KSPlanetBase::MOON));
             setClickedPoint(clickedObject());
             slotCenter();
             break;
 
         case Qt::Key_4: //center on Mars
             setClickedObject(data->skyComposite()->planet(KSPlanetBase::MARS));
             setClickedPoint(clickedObject());
             slotCenter();
             break;
 
         case Qt::Key_5: //center on Jupiter
             setClickedObject(data->skyComposite()->planet(KSPlanetBase::JUPITER));
             setClickedPoint(clickedObject());
             slotCenter();
             break;
 
         case Qt::Key_6: //center on Saturn
             setClickedObject(data->skyComposite()->planet(KSPlanetBase::SATURN));
             setClickedPoint(clickedObject());
             slotCenter();
             break;
 
         case Qt::Key_7: //center on Uranus
             setClickedObject(data->skyComposite()->planet(KSPlanetBase::URANUS));
             setClickedPoint(clickedObject());
             slotCenter();
             break;
 
         case Qt::Key_8: //center on Neptune
             setClickedObject(data->skyComposite()->planet(KSPlanetBase::NEPTUNE));
             setClickedPoint(clickedObject());
             slotCenter();
             break;
 
         /*case Qt::Key_9: //center on Pluto
             setClickedObject( data->skyComposite()->planet( KSPlanetBase::PLUTO ) );
             setClickedPoint( clickedObject() );
             slotCenter();
             break;*/
 
         case Qt::Key_BracketLeft: // Begin measuring angular distance
             if (!rulerMode)
                 slotBeginAngularDistance();
             break;
         case Qt::Key_Escape: // Cancel angular distance measurement
         {
             if (rulerMode)
                 slotCancelRulerMode();
 
             if (m_fovCaptureMode)
                 slotFinishFovCaptureMode();
             break;
         }
 
         case Qt::Key_C: //Center clicked object
             if (clickedObject())
                 slotCenter();
             break;
 
         case Qt::Key_D: //Details window for Clicked/Centered object
         {
             SkyObject *orig = nullptr;
             if (shiftPressed)
             {
                 orig = clickedObject();
                 setClickedObject(focusObject());
             }
 
             if (clickedObject())
             {
                 slotDetail();
             }
 
             if (orig)
             {
                 setClickedObject(orig);
             }
             break;
         }
 
         case Qt::Key_P: //Show Popup menu for Clicked/Centered object
             if (shiftPressed)
             {
                 if (focusObject())
                     focusObject()->showPopupMenu(pmenu, QCursor::pos());
             }
             else
             {
                 if (clickedObject())
                     clickedObject()->showPopupMenu(pmenu, QCursor::pos());
             }
             break;
 
         case Qt::Key_O: //Add object to Observing List
         {
             SkyObject *orig = nullptr;
             if (shiftPressed)
             {
                 orig = clickedObject();
                 setClickedObject(focusObject());
             }
 
             if (clickedObject())
             {
                 data->observingList()->slotAddObject();
             }
 
             if (orig)
             {
                 setClickedObject(orig);
             }
             break;
         }
 
         case Qt::Key_L: //Toggle User label on Clicked/Centered object
         {
             SkyObject *orig = nullptr;
             if (shiftPressed)
             {
                 orig = clickedObject();
                 setClickedObject(focusObject());
             }
 
             if (clickedObject())
             {
                 if (isObjectLabeled(clickedObject()))
                     slotRemoveObjectLabel();
                 else
                     slotAddObjectLabel();
             }
 
             if (orig)
             {
                 setClickedObject(orig);
             }
             break;
         }
 
         case Qt::Key_T: //Toggle planet trail on Clicked/Centered object (if solsys)
         {
             SkyObject *orig = nullptr;
             if (shiftPressed)
             {
                 orig = clickedObject();
                 setClickedObject(focusObject());
             }
 
             KSPlanetBase *planet = dynamic_cast<KSPlanetBase *>(clickedObject());
             if (planet)
             {
                 if (planet->hasTrail())
                     slotRemovePlanetTrail();
                 else
                     slotAddPlanetTrail();
             }
 
             if (orig)
             {
                 setClickedObject(orig);
             }
             break;
         }
 
         case Qt::Key_R:
         {
             // Toggle relativistic corrections
             Options::setUseRelativistic(!Options::useRelativistic());
             qDebug() << Q_FUNC_INFO << "Relativistic corrections: " << Options::useRelativistic();
             forceUpdate();
             break;
         }
 
         case Qt::Key_A:
             Options::setUseAntialias(!Options::useAntialias());
             qDebug() << Q_FUNC_INFO << "Use Antialiasing: " << Options::useAntialias();
             forceUpdate();
             break;
 
         case Qt::Key_K:
         {
             if (m_fovCaptureMode)
                 slotCaptureFov();
             break;
         }
 
         case Qt::Key_PageUp:
         {
             KStars::Instance()->selectPreviousFov();
             break;
         }
 
         case Qt::Key_PageDown:
         {
             KStars::Instance()->selectNextFov();
             break;
         }
 
         default:
             // We don't want to do anything in this case. Key is unknown
             return;
     }
 
     if (arrowKeyPressed)
     {
         stopTracking();
         setDestination(*focus());
     }
 
     forceUpdate(); //need a total update, or slewing with the arrow keys doesn't work.
 }
 
 void SkyMap::stopTracking()
 {
     KStars *kstars = KStars::Instance();
 
     emit positionChanged(focus());
     if (kstars && Options::isTracking())
         kstars->slotTrack();
 }
 
 bool SkyMap::event(QEvent *event)
 {
 #if !defined(KSTARS_LITE)
     if (event->type() == QEvent::TouchBegin)
     {
         m_touchMode = true;
         m_pinchScale = -1;
     }
 
     if (event->type() == QEvent::Gesture && m_touchMode)
     {
         QGestureEvent* gestureEvent = static_cast<QGestureEvent*>(event);
 
         if (QPinchGesture *pinch = static_cast<QPinchGesture*>(gestureEvent->gesture(Qt::PinchGesture)))
         {
             QPinchGesture::ChangeFlags changeFlags = pinch->changeFlags();
 
             m_pinchMode = true;
             if (changeFlags & QPinchGesture::ScaleFactorChanged)
             {
                 if (m_pinchScale == -1)
                 {
                     m_pinchScale = pinch->totalScaleFactor();
                     return true;
                 }
                 if (pinch->totalScaleFactor() - m_pinchScale > 0.1)
                 {
                     m_pinchScale = pinch->totalScaleFactor();
                     zoomInOrMagStep(0);
                     return true;
                 }
                 if (pinch->totalScaleFactor() - m_pinchScale < -0.1)
                 {
                     m_pinchScale = pinch->totalScaleFactor();
                     zoomOutOrMagStep(0);
                     return true;
                 }
             }
         }
         if (QTapAndHoldGesture *tapAndHold = static_cast<QTapAndHoldGesture*>(gestureEvent->gesture(Qt::TapAndHoldGesture)))
         {
             m_tapAndHoldMode = true;
             if (tapAndHold->state() == Qt::GestureFinished)
             {
                 if (clickedObject())
                 {
                     clickedObject()->showPopupMenu(pmenu, tapAndHold->position().toPoint());
                 }
                 else
                 {
                     pmenu->createEmptyMenu(clickedPoint());
                     pmenu->popup(tapAndHold->position().toPoint());
                 }
                 m_touchMode = false;
                 m_pinchMode = false;
                 m_tapAndHoldMode = false;
             }
         }
         return true;
     }
 #endif
     return QGraphicsView::event(event);
 }
 
 void SkyMap::keyReleaseEvent(QKeyEvent *e)
 {
     switch (e->key())
     {
         case Qt::Key_Plus: //Zoom in
         case Qt::Key_Equal:
         case Qt::Key_Minus: //Zoom out
         case Qt::Key_Underscore:
 
         case Qt::Key_Left:  //no break; continue to Qt::Key_Down
         case Qt::Key_Right: //no break; continue to Qt::Key_Down
         case Qt::Key_Up:    //no break; continue to Qt::Key_Down
         case Qt::Key_Down:
             slewing = false;
 
             if (Options::useAltAz())
                 setDestinationAltAz(focus()->alt(), focus()->az(), false);
             else
                 setDestination(*focus());
 
             showFocusCoords();
             forceUpdate(); // Need a full update to draw faint objects that are not drawn while slewing.
             break;
     }
 }
 
 void SkyMap::mouseMoveEvent(QMouseEvent *e)
 {
 #if !defined(KSTARS_LITE)
     // Skip touch points
     if (m_pinchMode || m_tapAndHoldMode || (m_touchMode && e->globalX() == 0 && e->globalY() == 0))
         return;
 #endif
 
     if (Options::useHoverLabel())
     {
         //Start a single-shot timer to monitor whether we are currently hovering.
         //The idea is that whenever a moveEvent occurs, the timer is reset.  It
         //will only timeout if there are no move events for HOVER_INTERVAL ms
         m_HoverTimer.start(HOVER_INTERVAL);
         QToolTip::hideText();
     }
 
     //Are we defining a ZoomRect?
     if (ZoomRect.center().x() > 0 && ZoomRect.center().y() > 0)
     {
         //cancel operation if the user let go of CTRL
         if (!(e->modifiers() & Qt::ControlModifier))
         {
             ZoomRect = QRect(); //invalidate ZoomRect
             update();
         }
         else
         {
             //Resize the rectangle so that it passes through the cursor position
             QPoint pcenter = ZoomRect.center();
             int dx         = abs(e->x() - pcenter.x());
             int dy         = abs(e->y() - pcenter.y());
             if (dx == 0 || float(dy) / float(dx) > float(height()) / float(width()))
             {
                 //Size rect by height
                 ZoomRect.setHeight(2 * dy);
                 ZoomRect.setWidth(2 * dy * width() / height());
             }
             else
             {
                 //Size rect by height
                 ZoomRect.setWidth(2 * dx);
                 ZoomRect.setHeight(2 * dx * height() / width());
             }
             ZoomRect.moveCenter(pcenter); //reset center
 
             update();
             return;
         }
     }
 
     if (projector()->unusablePoint(e->pos()))
         return; // break if point is unusable
 
     //determine RA, Dec of mouse pointer
     m_MousePoint = projector()->fromScreen(e->pos(), data->lst(), data->geo()->lat());
 
     double dyPix = 0.5 * height() - e->y();
     if (midMouseButtonDown) //zoom according to y-offset
     {
         float yoff = dyPix - y0;
         if (yoff > 10)
         {
             y0 = dyPix;
             slotZoomIn();
         }
         if (yoff < -10)
         {
             y0 = dyPix;
             slotZoomOut();
         }
     }
 
     if (mouseButtonDown)
     {
 #ifdef HAVE_INDI
         if (Options::showMosaicPanel())
         {
             auto tiles = KStarsData::Instance()->skyComposite()->mosaicComponent()->tiles();
 
             if (tiles->operationMode() == MosaicTiles::MODE_PLANNING)
             {
                 // Check if mouse point within Mosaic FOV bounds.
                 auto mosaicFOV = tiles->mosaicFOV();
                 auto upperRA = tiles->ra0().Degrees() + mosaicFOV.width() / 60;
                 auto lowerRA = tiles->ra0().Degrees() - mosaicFOV.width() / 60;
                 auto upperDE = tiles->dec0().Degrees() + mosaicFOV.height() / 60;
                 auto lowerDE = tiles->dec0().Degrees() - mosaicFOV.height() / 60;
 
                 auto mouseRA = m_MousePoint.ra().Degrees();
                 auto mouseDE = m_MousePoint.dec().Degrees();
 
                 // If mouse point is within, then behave like drag and drop
                 if (mouseRA > lowerRA && mouseRA < upperRA && mouseDE > lowerDE && mouseDE < upperDE)
                 {
                     if (!mouseDragCursor)
                         setMouseDragCursor();
 
                     dms dRA  = m_MousePoint.ra() - clickedPoint()->ra();
                     dms dDec = m_MousePoint.dec() - clickedPoint()->dec();
 
                     // Emit difference between mouse point and clicked point.
                     emit mosaicCenterChanged(dRA, dDec);
 
                     // Update mouse and clicked points.
                     m_MousePoint = projector()->fromScreen(e->pos(), data->lst(), data->geo()->lat());
                     setClickedPoint(&m_MousePoint);
                     update();
                     return;
                 }
             }
         }
 #endif
 
         // set the mouseMoveCursor and set slewing=true, if they are not set yet
         if (!mouseMoveCursor)
             setMouseMoveCursor();
         if (!slewing)
         {
             slewing = true;
             stopTracking(); //toggle tracking off
         }
 
         //Update focus such that the sky coords at mouse cursor remain approximately constant
         if (Options::useAltAz())
         {
             m_MousePoint.EquatorialToHorizontal(data->lst(), data->geo()->lat());
             clickedPoint()->EquatorialToHorizontal(data->lst(), data->geo()->lat());
             dms dAz  = m_MousePoint.az() - clickedPoint()->az();
             dms dAlt = m_MousePoint.altRefracted() - clickedPoint()->altRefracted();
             focus()->setAz(focus()->az().Degrees() - dAz.Degrees()); //move focus in opposite direction
             focus()->setAz(focus()->az().reduce());
             focus()->setAltRefracted(KSUtils::clamp(focus()->altRefracted().Degrees() - dAlt.Degrees(), -90.0, 90.0));
             focus()->HorizontalToEquatorial(data->lst(), data->geo()->lat());
         }
         else
         {
             dms dRA  = m_MousePoint.ra() - clickedPoint()->ra();
             dms dDec = m_MousePoint.dec() - clickedPoint()->dec();
             focus()->setRA(focus()->ra().Hours() - dRA.Hours()); //move focus in opposite direction
             focus()->setRA(focus()->ra().reduce());
             focus()->setDec(KSUtils::clamp(focus()->dec().Degrees() - dDec.Degrees(), -90.0, 90.0));
             focus()->EquatorialToHorizontal(data->lst(), data->geo()->lat());
         }
         showFocusCoords();
 
         //redetermine RA, Dec of mouse pointer, using new focus
         m_MousePoint = projector()->fromScreen(e->pos(), data->lst(), data->geo()->lat());
         setClickedPoint(&m_MousePoint);
         forceUpdate(); // must be new computed
     }
     else //mouse button not down
     {
         if (Options::useAltAz())
             m_MousePoint.EquatorialToHorizontal(data->lst(), data->geo()->lat());
         emit mousePointChanged(&m_MousePoint);
     }
 }
 
 void SkyMap::wheelEvent(QWheelEvent *e)
 {
     if (e->angleDelta().y() > 0)
         zoomInOrMagStep(e->modifiers());
     else if (e->angleDelta().y() < 0)
         zoomOutOrMagStep(e->modifiers());
 }
 
 void SkyMap::mouseReleaseEvent(QMouseEvent *e)
 {
 #if !defined(KSTARS_LITE)
     if (m_touchMode)
     {
         m_touchMode = false;
         m_pinchMode = false;
         m_tapAndHoldMode = false;
     }
 #endif
 
     if (ZoomRect.isValid())
     {
         stopTracking();
         SkyPoint newcenter = projector()->fromScreen(ZoomRect.center(), data->lst(), data->geo()->lat());
         setFocus(&newcenter);
         setDestination(newcenter);
 
         //Zoom in on center of Zoom Circle, by a factor equal to the ratio
         //of the sky pixmap's width to the Zoom Circle's diameter
         float factor = float(width()) / float(ZoomRect.width());
         setZoomFactor(Options::zoomFactor() * factor);
     }
 
     setMouseCursorShape(static_cast<Cursor>(Options::defaultCursor()));
 
     ZoomRect = QRect(); //invalidate ZoomRect
 
     if (m_previewLegend)
     {
         slotCancelLegendPreviewMode();
     }
 
     //false if double-clicked, because it's unset there.
     if (mouseButtonDown)
     {
         mouseButtonDown = false;
         if (slewing)
         {
             slewing = false;
             if (Options::useAltAz())
                 setDestinationAltAz(focus()->alt(), focus()->az(), false);
             else
                 setDestination(*focus());
         }
         else if (Options::leftClickSelectsObject())
             mouseDoubleClickEvent(e);
         forceUpdate(); // is needed because after moving the sky not all stars are shown
     }
     // if middle button was pressed unset here
     midMouseButtonDown = false;
 }
 
 void SkyMap::mousePressEvent(QMouseEvent *e)
 {
     KStars *kstars = KStars::Instance();
 
     if ((e->modifiers() & Qt::ControlModifier) && (e->button() == Qt::LeftButton))
     {
         ZoomRect.moveCenter(e->pos());
         setZoomMouseCursor();
         update(); //refresh without redrawing skymap
         return;
     }
 
     // if button is down and cursor is not moved set the move cursor after 500 ms
     //QTimer::singleShot(500, this, SLOT(setMouseMoveCursor()));
 
     // break if point is unusable
     if (projector()->unusablePoint(e->pos()))
         return;
 
     if (!midMouseButtonDown && e->button() == Qt::MidButton)
     {
         y0                 = 0.5 * height() - e->y(); //record y pixel coordinate for middle-button zooming
         midMouseButtonDown = true;
     }
 
     if (!mouseButtonDown)
     {
         if (e->button() == Qt::LeftButton)
         {
             mouseButtonDown = true;
         }
 
         //determine RA, Dec of mouse pointer
         m_MousePoint = projector()->fromScreen(e->pos(), data->lst(), data->geo()->lat());
         setClickedPoint(&m_MousePoint);
 
         //Find object nearest to clickedPoint()
         double maxrad  = 5000.0 / Options::zoomFactor();
         SkyObject *obj = data->skyComposite()->objectNearest(clickedPoint(), maxrad);
         setClickedObject(obj);
         if (obj)
             setClickedPoint(obj);
 
         switch (e->button())
         {
             case Qt::LeftButton:
             {
                 QString name;
                 if (clickedObject())
                 {
                     name = clickedObject()->translatedLongName();
                     emit objectClicked(clickedObject());
                 }
                 else
                     name = i18n("Empty sky");
                 //kstars->statusBar()->changeItem(name, 0 );
                 kstars->statusBar()->showMessage(name, 0);
 
                 emit positionClicked(&m_MousePoint);
             }
 
             break;
             case Qt::RightButton:
                 if (rulerMode)
                 {
                     // Compute angular distance.
                     slotEndRulerMode();
                 }
                 else
                 {
                     // Show popup menu
                     if (clickedObject())
                     {
                         clickedObject()->showPopupMenu(pmenu, QCursor::pos());
                     }
                     else
                     {
                         pmenu->createEmptyMenu(clickedPoint());
                         pmenu->popup(QCursor::pos());
                     }
                 }
                 break;
             default:
                 ;
         }
     }
 }
 
 void SkyMap::mouseDoubleClickEvent(QMouseEvent *e)
 {
     if (e->button() == Qt::LeftButton && !projector()->unusablePoint(e->pos()))
     {
         mouseButtonDown = false;
         if (e->x() != width() / 2 || e->y() != height() / 2)
             slotCenter();
     }
 }
 
 double SkyMap::zoomFactor(const int modifier)
 {
     double factor = (modifier & Qt::ControlModifier) ? DZOOM : (Options::zoomScrollFactor() + 1);
     if (modifier & Qt::ShiftModifier)
         factor = sqrt(factor);
     return factor;
 }
 
 void SkyMap::zoomInOrMagStep(const int modifier)
 {
     if (modifier & Qt::AltModifier)
         incMagLimit(modifier);
     else
         setZoomFactor(Options::zoomFactor() * zoomFactor(modifier));
 }
 
 void SkyMap::zoomOutOrMagStep(const int modifier)
 {
     if (modifier & Qt::AltModifier)
         decMagLimit(modifier);
     else
         setZoomFactor(Options::zoomFactor() / zoomFactor(modifier));
 }
 
 double SkyMap::magFactor(const int modifier)
 {
     double factor = (modifier & Qt::ControlModifier) ? 0.1 : 0.5;
     if (modifier & Qt::ShiftModifier)
         factor *= 2.0;
     return factor;
 }
 
 void SkyMap::incMagLimit(const int modifier)
 {
     double limit = 2.222 * log10(static_cast<double>(Options::starDensity())) + 0.35;
     limit += magFactor(modifier);
     if (limit > 5.75954)
         limit = 5.75954;
     Options::setStarDensity(pow(10, (limit - 0.35) / 2.222));
     //printf("maglim set to %3.1f\n", limit);
     forceUpdate();
 }
 
 void SkyMap::decMagLimit(const int modifier)
 {
     double limit = 2.222 * log10(static_cast<double>(Options::starDensity())) + 0.35;
     limit -= magFactor(modifier);
     if (limit < 1.18778)
         limit = 1.18778;
     Options::setStarDensity(pow(10, (limit - 0.35) / 2.222));
     //printf("maglim set to %3.1f\n", limit);
     forceUpdate();
 }