File indexing completed on 2024-04-14 14:11:54

 /*
     SPDX-FileCopyrightText: 2010 Henry de Valence <hdevalence@gmail.com>
 
     SPDX-License-Identifier: GPL-2.0-or-later
 */
 
 #ifdef _WIN32
 #include <windows.h>
 #endif
 #include "skyglpainter.h"
 
 #include <cstddef>
 #include <Eigen/Geometry>
 
 #include <GL/gl.h>
 #include <QGLWidget>
 
 #include "skymap.h"
 #include "kstarsdata.h"
 #include "Options.h"
 
 #include "texturemanager.h"
 
 #include "skycomponents/linelist.h"
 #include "skycomponents/skiphashlist.h"
 #include "skycomponents/linelistlabel.h"
 #include "skycomponents/skymapcomposite.h"
 #include "skycomponents/flagcomponent.h"
 #include "skycomponents/satellitescomponent.h"
 #include "skycomponents/supernovaecomponent.h"
 #include "skycomponents/constellationartcomponent.h"
 #include "skyobjects/kscomet.h"
 #include "skyobjects/ksasteroid.h"
 #include "skyobjects/trailobject.h"
 #include "skyobjects/satellite.h"
 #include "skyobjects/supernova.h"
 #include "skyobjects/constellationsart.h"
 
 Eigen::Vector2f SkyGLPainter::m_vertex[NUMTYPES][6 * BUFSIZE];
 Eigen::Vector2f SkyGLPainter::m_texcoord[NUMTYPES][6 * BUFSIZE];
 Eigen::Vector3f SkyGLPainter::m_color[NUMTYPES][6 * BUFSIZE];
 int SkyGLPainter::m_idx[NUMTYPES];
 bool SkyGLPainter::m_init = false;
 
 SkyGLPainter::SkyGLPainter(QGLWidget *widget) : SkyPainter()
 {
     m_widget = widget;
     if (!m_init)
     {
         qDebug() << "Initializing texcoord arrays...\n";
         for (int i = 0; i < NUMTYPES; ++i)
         {
             m_idx[i] = 0;
             for (int j = 0; j < BUFSIZE; ++j)
             {
                 m_texcoord[i][6 * j + 0] = Eigen::Vector2f(0, 0);
                 m_texcoord[i][6 * j + 1] = Eigen::Vector2f(1, 0);
                 m_texcoord[i][6 * j + 2] = Eigen::Vector2f(0, 1);
                 m_texcoord[i][6 * j + 3] = Eigen::Vector2f(0, 1);
                 m_texcoord[i][6 * j + 4] = Eigen::Vector2f(1, 0);
                 m_texcoord[i][6 * j + 5] = Eigen::Vector2f(1, 1);
             }
         }
         //Generate textures that were loaded before the SkyMap was
         m_init = true;
     }
 }
 
 void SkyGLPainter::drawBuffer(int type)
 {
     // Prevent crash if type > UNKNOWN
     if (type > SkyObject::TYPE_UNKNOWN)
         type = SkyObject::TYPE_UNKNOWN;
 
     //printf("Drawing buffer for type %d, has %d objects\n", type, m_idx[type]);
     if (m_idx[type] == 0)
         return;
 
     glEnable(GL_TEXTURE_2D);
     switch (type)
     {
         case 3:
         case 13:
             TextureManager::bindTexture("open-cluster", m_widget);
             break;
         case 4:
             TextureManager::bindTexture("globular-cluster", m_widget);
             break;
         case 6:
             TextureManager::bindTexture("planetary-nebula", m_widget);
             break;
         case 5:
         case 7:
         case 15:
             TextureManager::bindTexture("gaseous-nebula", m_widget);
             break;
         case 8:
         case 16:
             TextureManager::bindTexture("galaxy", m_widget);
             break;
         case 14:
             TextureManager::bindTexture("galaxy-cluster", m_widget);
             break;
         case 0:
         case 1:
         default:
             TextureManager::bindTexture("star", m_widget);
             break;
     }
 
     glEnable(GL_BLEND);
     glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
     glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
     glEnableClientState(GL_VERTEX_ARRAY);
     glEnableClientState(GL_COLOR_ARRAY);
     glEnableClientState(GL_TEXTURE_COORD_ARRAY);
 
     glVertexPointer(2, GL_FLOAT, 0, &m_vertex[type]);
     glTexCoordPointer(2, GL_FLOAT, 0, &m_texcoord[type]);
     glColorPointer(3, GL_FLOAT, 0, &m_color[type]);
 
     glDrawArrays(GL_TRIANGLES, 0, 6 * m_idx[type]);
     m_idx[type] = 0;
 
     glDisableClientState(GL_VERTEX_ARRAY);
     glDisableClientState(GL_COLOR_ARRAY);
     glDisableClientState(GL_TEXTURE_COORD_ARRAY);
 }
 
 bool SkyGLPainter::addItem(SkyPoint *p, int type, float width, char sp)
 {
     bool visible = false;
     Eigen::Vector2f vec = m_proj->toScreenVec(p, true, &visible);
     if (!visible)
         return false;
 
     // Prevent crash if type > UNKNOWN
     if (type > SkyObject::TYPE_UNKNOWN)
         type = SkyObject::TYPE_UNKNOWN;
 
     //If the buffer is full, flush it
     if (m_idx[type] == BUFSIZE)
     {
         drawBuffer(type);
     }
 
     int i   = 6 * m_idx[type];
     float w = width / 2.;
 
     m_vertex[type][i + 0] = vec + Eigen::Vector2f(-w, -w);
     m_vertex[type][i + 1] = vec + Eigen::Vector2f(w, -w);
     m_vertex[type][i + 2] = vec + Eigen::Vector2f(-w, w);
     m_vertex[type][i + 3] = vec + Eigen::Vector2f(-w, w);
     m_vertex[type][i + 4] = vec + Eigen::Vector2f(w, -w);
     m_vertex[type][i + 5] = vec + Eigen::Vector2f(w, w);
 
     Eigen::Vector3f c(1., 1., 1.);
     if (sp != 'x' && Options::starColorMode() != 0)
     {
         // We have a star and aren't drawing real star colors
         switch (Options::starColorMode())
         {
             case 1: // solid red
                 c = Eigen::Vector3f(255. / 255., 0., 0.);
                 break;
             case 2: // solid black
                 c = Eigen::Vector3f(0., 0., 0.);
                 break;
             case 3: // Solid white
                 c = Eigen::Vector3f(1., 1., 1.);
                 break;
         }
     }
     else
     {
         QColor starColor;
 
         // Set RGB values into QColor
         switch (sp)
         {
             case 'o':
             case 'O':
                 starColor.setRgb(153, 153, 255);
                 break;
             case 'b':
             case 'B':
                 starColor.setRgb(151, 233, 255);
                 break;
             case 'a':
             case 'A':
                 starColor.setRgb(153, 255, 255);
                 break;
             case 'f':
             case 'F':
                 starColor.setRgb(219, 255, 135);
                 break;
             case 'g':
             case 'G':
                 starColor.setRgb(255, 255, 153);
                 break;
             case 'k':
             case 'K':
                 starColor.setRgb(255, 193, 153);
                 break;
             case 'm':
             case 'M':
                 starColor.setRgb(255, 153, 153);
                 break;
             case 'x':
                 starColor.setRgb(m_pen[0] * 255, m_pen[1] * 255, m_pen[2] * 255);
                 break;
             default:
                 starColor.setRgb(153, 255, 255);
                 break; // If we don't know what spectral type, we use the same as 'A' (See SkyQPainter)
         }
 
         // Convert to HSV space using QColor's methods and adjust saturation.
         int h, s, v;
         starColor.getHsv(&h, &s, &v);
         s = (Options::starColorIntensity() / 10.) *
             200.; // Rewrite the saturation based on the star color intensity setting, 200 is the hard-wired max saturation, just to approximately match up with QPainter mode.
         starColor.setHsv(h, s, v);
 
         // Get RGB ratios and put them in 'c'
         c = Eigen::Vector3f(starColor.redF(), starColor.greenF(), starColor.blueF());
     }
     for (int j = 0; j < 6; ++j)
     {
         m_color[type][i + j] = c;
     }
 
     ++m_idx[type];
     return true;
 }
 
 void SkyGLPainter::drawTexturedRectangle(const QImage &img, const Eigen::Vector2f &pos, const float angle, const float sizeX,
                                          const float sizeY)
 {
     // Set up texture
     glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
     glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
     glEnable(GL_TEXTURE_2D);
     TextureManager::bindFromImage(img, m_widget);
 
     // Render rectangle
     glPushMatrix();
     glTranslatef(pos.x(), pos.y(), 0);
     glRotatef(angle, 0, 0, 1);
     glScalef(sizeX, sizeY, 1);
 
     glBegin(GL_QUADS);
     // Note! Y coordinate of texture is mirrored w.r.t. to
     // vertex coordinates to account for difference between
     // OpenGL and QPainter coordinate system.
     // Otherwise image would appear mirrored
     glTexCoord2f(0, 1);
     glVertex2f(-0.5, -0.5);
 
     glTexCoord2f(1, 1);
     glVertex2f(0.5, -0.5);
 
     glTexCoord2f(1, 0);
     glVertex2f(0.5, 0.5);
 
     glTexCoord2f(0, 0);
     glVertex2f(-0.5, 0.5);
     glEnd();
 
     glPopMatrix();
 }
 
 bool SkyGLPainter::drawPlanet(KSPlanetBase *planet)
 {
     //If it's surely not visible, just stop now
     if (!m_proj->checkVisibility(planet))
         return false;
 
     float zoom         = Options::zoomFactor();
     float fakeStarSize = (10.0 + log10(zoom) - log10(MINZOOM)) * (10 - planet->mag()) / 10;
     fakeStarSize       = qMin(fakeStarSize, 20.f);
 
     float size = planet->angSize() * dms::PI * zoom / 10800.0;
     if (size < fakeStarSize || planet->image().isNull())
     {
         // Draw them as bright stars of appropriate color instead of images
         char spType;
         //FIXME: do these need i18n?
         if (planet->name() == xi18n("Sun"))
         {
             spType = 'G';
         }
         else if (planet->name() == xi18n("Mars"))
         {
             spType = 'K';
         }
         else if (planet->name() == xi18n("Jupiter") || planet->name() == xi18n("Mercury") ||
                  planet->name() == xi18n("Saturn"))
         {
             spType = 'F';
         }
         else
         {
             spType = 'B';
         }
         return addItem(planet, planet->type(), qMin(fakeStarSize, (float)20.), spType);
     }
     else
     {
         // Draw them as textures
         bool visible = false;
         Eigen::Vector2f pos = m_proj->toScreenVec(planet, true, &visible);
         if (!visible)
             return false;
 
         //Because Saturn has rings, we inflate its image size by a factor 2.5
         if (planet->name() == "Saturn")
             size *= 2.5;
 
         drawTexturedRectangle(planet->image(), pos, m_proj->findPA(planet, pos.x(), pos.y()), size, size);
         return true;
     }
 }
 
 bool SkyGLPainter::drawPointSource(const SkyPoint *loc, float mag, char sp)
 {
     //If it's surely not visible, just stop now
     if (!m_proj->checkVisibility(loc))
         return false;
     return addItem(loc, SkyObject::STAR, starWidth(mag), sp);
 }
 
 void SkyGLPainter::drawSkyPolygon(LineList *list)
 {
     SkyList *points = list->points();
     bool isVisible, isVisibleLast;
     SkyPoint *pLast = points->last();
     Eigen::Vector2f oLast  = m_proj->toScreenVec(pLast, true, &isVisibleLast);
     // & with the result of checkVisibility to clip away things below horizon
     isVisibleLast &= m_proj->checkVisibility(pLast);
 
     //Guess that we will require around the same number of items as in points.
     QVector<Eigen::Vector2f> polygon;
     polygon.reserve(points->size());
     for (int i = 0; i < points->size(); ++i)
     {
         SkyPoint *pThis = points->at(i);
         Eigen::Vector2f oThis  = m_proj->toScreenVec(pThis, true, &isVisible);
         // & with the result of checkVisibility to clip away things below horizon
         isVisible &= m_proj->checkVisibility(pThis);
 
         if (isVisible && isVisibleLast)
         {
             polygon << oThis;
         }
         else if (isVisibleLast)
         {
             Eigen::Vector2f oMid = m_proj->clipLineVec(pLast, pThis);
             polygon << oMid;
         }
         else if (isVisible)
         {
             Eigen::Vector2f oMid = m_proj->clipLineVec(pThis, pLast);
             polygon << oMid;
             polygon << oThis;
         }
 
         pLast         = pThis;
         oLast         = oThis;
         isVisibleLast = isVisible;
     }
 
 // false -> makes kstars slower but is always accurate
 // true -> faster but potentially results in incorrect rendering
 #define KSTARS_ASSUME_CONVEXITY false
     if (polygon.size())
     {
         drawPolygon(polygon, KSTARS_ASSUME_CONVEXITY);
     }
 }
 
 void SkyGLPainter::drawPolygon(const QVector<Eigen::Vector2f> &polygon, bool convex, bool flush_buffers)
 {
     //Flush all buffers
     if (flush_buffers)
     {
         for (int i = 0; i < NUMTYPES; ++i)
         {
             drawBuffer(i);
         }
     }
     glDisable(GL_TEXTURE_2D);
     glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
     if (!convex)
     {
         //Set up the stencil buffer and disable the color buffer
         glClear(GL_STENCIL_BUFFER_BIT);
         glColorMask(0, 0, 0, 0);
         glEnable(GL_STENCIL_TEST);
         glStencilFunc(GL_ALWAYS, 0, 0);
         glStencilOp(GL_INVERT, GL_INVERT, GL_INVERT);
         //Now draw a triangle fan. Because of the GL_INVERT,
         //this will fill the stencil buffer with odd-even fill.
         glEnableClientState(GL_VERTEX_ARRAY);
         glVertexPointer(2, GL_FLOAT, 0, polygon.data());
         glDrawArrays(GL_TRIANGLE_FAN, 0, polygon.size());
         glDisableClientState(GL_VERTEX_ARRAY);
 
         //Now draw the stencil:
         glStencilFunc(GL_NOTEQUAL, 0, 0xffffffff);
         glColorMask(1, 1, 1, 1);
         glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
         glBegin(GL_QUADS);
         glVertex2f(0, 0);
         glVertex2f(0, m_widget->height());
         glVertex2f(m_widget->width(), m_widget->height());
         glVertex2f(m_widget->width(), 0);
         glEnd();
         glDisable(GL_STENCIL_TEST);
     }
     else
     {
         glEnableClientState(GL_VERTEX_ARRAY);
         glVertexPointer(2, GL_FLOAT, 0, polygon.data());
         glDrawArrays(GL_POLYGON, 0, polygon.size());
         glDisableClientState(GL_VERTEX_ARRAY);
     }
 }
 
 void SkyGLPainter::drawHorizon(bool filled, SkyPoint *labelPoint, bool *drawLabel)
 {
     QVector<Eigen::Vector2f> ground = m_proj->groundPoly(labelPoint, drawLabel);
 
     if (ground.size())
     {
         if (filled)
         {
             glDisableClientState(GL_COLOR_ARRAY);
             drawPolygon(ground, false, false);
         }
         else
         {
             glDisable(GL_TEXTURE_2D);
             glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
             glEnableClientState(GL_VERTEX_ARRAY);
             glVertexPointer(2, GL_FLOAT, 0, ground.data());
             glDrawArrays(GL_LINE_LOOP, 0, ground.size());
             glDisableClientState(GL_VERTEX_ARRAY);
         }
     }
 }
 
 //This implementation is *correct* but slow.
 void SkyGLPainter::drawSkyPolyline(LineList *list, SkipHashList *skipList, LineListLabel *label)
 {
     glDisable(GL_TEXTURE_2D);
     glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
     glBegin(GL_LINE_STRIP);
     SkyList *points = list->points();
     bool isVisible, isVisibleLast;
     Eigen::Vector2f oLast = m_proj->toScreenVec(points->first(), true, &isVisibleLast);
     // & with the result of checkVisibility to clip away things below horizon
     isVisibleLast &= m_proj->checkVisibility(points->first());
     if (isVisibleLast)
     {
         glVertex2fv(oLast.data());
     }
 
     for (int i = 1; i < points->size(); ++i)
     {
         Eigen::Vector2f oThis = m_proj->toScreenVec(points->at(i), true, &isVisible);
         // & with the result of checkVisibility to clip away things below horizon
         isVisible &= m_proj->checkVisibility(points->at(i));
 
         bool doSkip = (skipList ? skipList->skip(i) : false);
         //This tells us whether we need to end the current line or whether we
         //are to keep drawing into it. If we skip, then we are going to have to end.
         bool shouldEnd = doSkip;
 
         if (!doSkip)
         {
             if (isVisible && isVisibleLast)
             {
                 glVertex2fv(oThis.data());
                 if (label)
                 {
                     label->updateLabelCandidates(oThis.x(), oThis.y(), list, i);
                 }
             }
             else if (isVisibleLast)
             {
                 Eigen::Vector2f oMid = m_proj->clipLineVec(points->at(i - 1), points->at(i));
                 glVertex2fv(oMid.data());
                 //If the last point was visible but this one isn't we are at
                 //the end of a strip, so we need to end
                 shouldEnd = true;
             }
             else if (isVisible)
             {
                 Eigen::Vector2f oMid = m_proj->clipLineVec(points->at(i), points->at(i - 1));
                 glVertex2fv(oMid.data());
                 glVertex2fv(oThis.data());
             }
         }
 
         if (shouldEnd)
         {
             glEnd();
             glBegin(GL_LINE_STRIP);
             if (isVisible)
             {
                 glVertex2fv(oThis.data());
             }
         }
 
         isVisibleLast = isVisible;
     }
     glEnd();
 }
 
 //FIXME: implement these two
 
 void SkyGLPainter::drawObservingList(const QList<SkyObject *> &obs)
 {
     // TODO: Generalize to drawTargetList or something like that. Make
     // texture changeable etc.
     // TODO: Draw labels when required
 
     foreach (SkyObject *obj, obs)
     {
         if (!m_proj->checkVisibility(obj))
             continue;
         bool visible;
         Eigen::Vector2f vec = m_proj->toScreenVec(obj, true, &visible);
         if (!visible || !m_proj->onScreen(vec))
             continue;
         const float size = 30.;
         QImage obsmarker = TextureManager::getImage("obslistsymbol");
         drawTexturedRectangle(obsmarker, vec, 0, size, size);
     }
 }
 
 void SkyGLPainter::drawFlags()
 {
     KStarsData *data = KStarsData::Instance();
     SkyPoint *point;
     QImage image;
     const QString label;
     bool visible = false;
     Eigen::Vector2f vec;
     int i;
 
     for (i = 0; i < data->skyComposite()->flags()->size(); i++)
     {
         point = data->skyComposite()->flags()->pointList().at(i);
         image = data->skyComposite()->flags()->image(i);
 
         // Set Horizontal coordinates
         point->EquatorialToHorizontal(data->lst(), data->geo()->lat());
 
         // Get flag position on screen
         vec = m_proj->toScreenVec(point, true, &visible);
 
         // Return if flag is not visible
         if (!visible || !m_proj->onScreen(vec))
             continue;
 
         const QImage &img =
             data->skyComposite()->flags()->imageName(i) == "Default" ? TextureManager::getImage("defaultflag") : image;
 
         drawTexturedRectangle(img, vec, 0, img.width(), img.height());
         drawText(vec.x(), vec.y(), data->skyComposite()->flags()->label(i), QFont("Courier New", 10, QFont::Bold),
                  data->skyComposite()->flags()->labelColor(i));
     }
 }
 
 void SkyGLPainter::drawText(int x, int y, const QString text, QFont font, QColor color)
 {
     // Return if text is empty
     if (text.isEmpty())
         return;
 
     int longest, tex_size = 2;
 
     // Get size of text
     QFontMetrics fm(font);
     const QRect bounding_rect = fm.boundingRect(text);
 
     // Compute texture size
     if (bounding_rect.width() > bounding_rect.height())
         longest = bounding_rect.width();
     else
         longest = bounding_rect.height();
 
     while (tex_size < longest)
     {
         tex_size *= 2;
     }
 
     // Create image of text
     QImage text_image(tex_size, tex_size, QImage::Format_ARGB32);
     text_image.fill(Qt::transparent);
     QPainter p(&text_image);
     p.setFont(font);
     p.setPen(color);
     p.drawText(0, tex_size / 2, text);
     p.end();
 
     // Create texture
     float w  = text_image.width();
     float h  = text_image.height();
     float vx = x + 0.5 * w + 10;
     float vy = y - 10;
     drawTexturedRectangle(text_image, Eigen::Vector2f(vx, vy), 0, w, h);
 }
 
 bool SkyGLPainter::drawConstellationArtImage(ConstellationsArt *obj)
 {
 }
 
 void SkyGLPainter::drawSkyLine(SkyPoint *a, SkyPoint *b)
 {
     bool aVisible, bVisible;
     Eigen::Vector2f aScreen = m_proj->toScreenVec(a, true, &aVisible);
     Eigen::Vector2f bScreen = m_proj->toScreenVec(b, true, &bVisible);
 
     glDisable(GL_TEXTURE_2D);
     glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
     glBegin(GL_LINE_STRIP);
 
     //THREE CASES:
     if (aVisible && bVisible)
     {
         //Both a,b visible, so paint the line normally:
         glVertex2fv(aScreen.data());
         glVertex2fv(bScreen.data());
     }
     else if (aVisible)
     {
         //a is visible but b isn't:
         glVertex2fv(aScreen.data());
         glVertex2fv(m_proj->clipLineVec(a, b).data());
     }
     else if (bVisible)
     {
         //b is visible but a isn't:
         glVertex2fv(bScreen.data());
         glVertex2fv(m_proj->clipLineVec(b, a).data());
     } //FIXME: what if both are offscreen but the line isn't?
 
     glEnd();
 }
 
 void SkyGLPainter::drawSkyBackground()
 {
     glDisable(GL_TEXTURE_2D);
     QColor bg = KStarsData::Instance()->colorScheme()->colorNamed("SkyColor");
     glClearColor(bg.redF(), bg.greenF(), bg.blueF(), bg.alphaF());
     glClear(GL_COLOR_BUFFER_BIT);
 }
 
 void SkyGLPainter::end()
 {
     for (int i = 0; i < NUMTYPES; ++i)
     {
         drawBuffer(i);
     }
 }
 
 void SkyGLPainter::begin()
 {
     m_proj = m_sm->projector();
 
     //Load ortho projection
     glViewport(0, 0, m_widget->width(), m_widget->height());
     glMatrixMode(GL_PROJECTION);
     glLoadIdentity();
     glOrtho(0, m_widget->width(), m_widget->height(), 0, -1, 1);
 
     //reset modelview matrix
     glMatrixMode(GL_MODELVIEW);
     glLoadIdentity();
 
     //Set various parameters
     glDisable(GL_LIGHTING);
     glDisable(GL_COLOR_MATERIAL);
     glDisable(GL_CULL_FACE);
     glDisable(GL_DEPTH_TEST);
     glDepthMask(GL_FALSE);
     glPointSize(1.);
     glEnable(GL_POINT_SMOOTH);
     glEnable(GL_LINE_SMOOTH);
     glEnable(GL_POLYGON_SMOOTH);
     glLineStipple(1, 0xCCCC);
     glEnable(GL_BLEND);
 
     glClearStencil(0);
 }
 
 void SkyGLPainter::setBrush(const QBrush &brush)
 {
     Q_UNUSED(brush);
     /*
     QColor c = brush.color();
     m_pen = Eigen::Vector4f( c.redF(), c.greenF(), c.blueF(), c.alphaF() );
     glColor4fv( m_pen.data() );
     */
 }
 
 void SkyGLPainter::setPen(const QPen &pen)
 {
     QColor c = pen.color();
     m_pen    = Eigen::Vector4f(c.redF(), c.greenF(), c.blueF(), c.alphaF());
     glColor4fv(m_pen.data());
     glLineWidth(pen.widthF());
     if (pen.style() != Qt::SolidLine)
     {
         glEnable(GL_LINE_STIPPLE);
     }
     else
     {
         glDisable(GL_LINE_STIPPLE);
     }
 }
 
 void SkyGLPainter::drawSatellite(Satellite *sat)
 {
     KStarsData *data = KStarsData::Instance();
     bool visible     = false;
     Eigen::Vector2f pos, vertex;
 
     sat->HorizontalToEquatorial(data->lst(), data->geo()->lat());
 
     pos = m_proj->toScreenVec(sat, true, &visible);
 
     if (!visible || !m_proj->onScreen(pos))
         return;
 
     if (Options::drawSatellitesLikeStars())
     {
         drawPointSource(sat, 3.5, 'B');
     }
     else
     {
         if (sat->isVisible())
             setPen(data->colorScheme()->colorNamed("VisibleSatColor"));
         else
             setPen(data->colorScheme()->colorNamed("SatColor"));
 
         glDisable(GL_TEXTURE_2D);
         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
         glBegin(GL_QUADS);
 
         vertex = pos + Eigen::Vector2f(-1.0, -1.0);
         glVertex2fv(vertex.data());
         vertex = pos + Eigen::Vector2f(1.0, -1.0);
         glVertex2fv(vertex.data());
         vertex = pos + Eigen::Vector2f(1.0, 1.0);
         glVertex2fv(vertex.data());
         vertex = pos + Eigen::Vector2f(-1.0, 1.0);
         glVertex2fv(vertex.data());
 
         glEnd();
     }
 
     if (Options::showSatellitesLabels())
         data->skyComposite()->satellites()->drawLabel(sat, QPointF(pos.x(), pos.y()));
 }
 
 bool SkyGLPainter::drawSupernova(Supernova *sup)
 {
     KStarsData *data = KStarsData::Instance();
     bool visible     = false;
     Eigen::Vector2f pos, vertex;
 
     sup->HorizontalToEquatorial(data->lst(), data->geo()->lat());
 
     pos = m_proj->toScreenVec(sup, true, &visible);
 
     if (!visible || !m_proj->onScreen(pos))
         return false;
     setPen(data->colorScheme()->colorNamed("SupernovaColor"));
 
     glDisable(GL_TEXTURE_2D);
     glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 
     glBegin(GL_LINES);
     vertex = pos + Eigen::Vector2f(2.0, 0.0);
     glVertex2fv(vertex.data());
     vertex = pos + Eigen::Vector2f(-2.0, 0.0);
     glVertex2fv(vertex.data());
     glEnd();
 
     glBegin(GL_LINES);
     vertex = pos + Eigen::Vector2f(0.0, 2.0);
     glVertex2fv(vertex.data());
     vertex = pos + Eigen::Vector2f(0.0, -2.0);
     glVertex2fv(vertex.data());
     glEnd();
 
     return true;
 }