src/Instrumentation/groundradar.cxx

   1 //  groundradar.cxx - Background layer for the ATC radar.
   2 //
   3 //  Written by Csaba Halasz.
   4 //
   5 //  This program is free software; you can redistribute it and/or
   6 //  modify it under the terms of the GNU General Public License as
   7 //  published by the Free Software Foundation; either version 2 of the
   8 //  License, or (at your option) any later version.
   9 //
  10 //  This program is distributed in the hope that it will be useful, but
  11 //  WITHOUT ANY WARRANTY; without even the implied warranty of
  12 //  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13 //  General Public License for more details.
  14 //
  15 //  You should have received a copy of the GNU General Public License
  16 //  along with this program; if not, write to the Free Software
  17 //  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  18
  19 #ifdef HAVE_CONFIG_H
  20 #  include "config.h"
  21 #endif
  22
  23 #include <osg/Node>
  24 #include <osg/Geode>
  25 #include <osg/Geometry>
  26 #include <osg/Camera>
  27 #include <osg/Texture2D>
  28 #include <osgViewer/Viewer>
  29
  30 #include <osgText/Text>
  31 #include <osgDB/Registry>
  32 #include <osgDB/ReaderWriter>
  33
  34 #include <Main/fg_props.hxx>
  35 #include <Main/globals.hxx>
  36 #include <Main/renderer.hxx>
  37 #include <Cockpit/panel.hxx>
  38 #include <Airports/simple.hxx>
  39 #include <Airports/runways.hxx>
  40 #include <simgear/math/sg_geodesy.hxx>
  41
  42 #include "groundradar.hxx"
  43
  44 static const char* airport_node_name = "/sim/tower/airport-id";
  45 static const char* texture_name = "Aircraft/Instruments/Textures/od_groundradar.rgb";
  46 static const char* radar_node_name = "/instrumentation/radar/range";
  47
  48 struct SingleFrameCallback : public osg::Camera::DrawCallback
  49 {
  50     virtual void operator () (const osg::Camera& camera) const
  51     {
  52         const_cast<osg::Camera&>(camera).setNodeMask(0);
  53     }
  54 };
  55
  56 GroundRadar::GroundRadar(SGPropertyNode *node)
  57 {
  58     _airport_node = fgGetNode(airport_node_name, true);
  59     _radar_node = fgGetNode(radar_node_name, true);
  60     createTexture();
  61     updateTexture();
  62     _airport_node->addChangeListener(this);
  63     _radar_node->addChangeListener(this);
  64 }
  65
  66 GroundRadar::~GroundRadar()
  67 {
  68     _airport_node->removeChangeListener(this);
  69     _radar_node->removeChangeListener(this);
  70 }
  71
  72 void GroundRadar::valueChanged(SGPropertyNode*)
  73 {
  74     updateTexture();
  75 }
  76
  77 inline static osg::Vec3 fromPolar(double fi, double r)
  78 {
  79     return osg::Vec3(sin(fi * SGD_DEGREES_TO_RADIANS) * r, cos(fi * SGD_DEGREES_TO_RADIANS) * r, 0);
  80 }
  81
  82 void GroundRadar::createTexture()
  83 {
  84     setSize(512);
  85     allocRT();
  86
  87     osg::Vec4Array* colors = new osg::Vec4Array;
  88     colors->push_back(osg::Vec4(0.0f,0.5f,0.0f,1.0f));
  89     colors->push_back(osg::Vec4(0.0f,0.5f,0.5f,1.0f));
  90
  91     _geom = new osg::Geometry();
  92     _geom->setColorArray(colors);
  93     _geom->setColorBinding(osg::Geometry::BIND_PER_PRIMITIVE_SET);
  94     _geom->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::QUADS, 0, 0));
  95     _geom->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::QUADS, 0, 0));
  96
  97     osg::Geode* geode = new osg::Geode();
  98     osg::StateSet* stateset = geode->getOrCreateStateSet();
  99     stateset->setMode(GL_BLEND, osg::StateAttribute::OFF);
 100     geode->addDrawable(_geom.get());
 101
 102     osg::Camera* camera = getCamera();
 103     camera->setPostDrawCallback(new SingleFrameCallback());
 104     camera->addChild(geode);
 105     camera->setNodeMask(0);
 106     camera->setProjectionMatrixAsOrtho2D(0, getTexture()->getTextureWidth(), 0, getTexture()->getTextureHeight());
 107
 108     // Texture in the 2D panel system
 109     FGTextureManager::addTexture(texture_name, getTexture());
 110 }
 111
 112 void GroundRadar::updateTexture()
 113 {
 114     osg::ref_ptr<osg::Vec3Array> rwy_vertices = new osg::Vec3Array;
 115     osg::ref_ptr<osg::Vec3Array> taxi_vertices = new osg::Vec3Array;
 116
 117     const string airport_name = _airport_node->getStringValue();
 118     FGRunwayList* runways = globals->get_runways();
 119
 120     const FGAirport* airport = fgFindAirportID(airport_name);
 121     const SGGeod& tower_location = airport->getTowerLocation();
 122     const double tower_lat = tower_location.getLatitudeDeg();
 123     const double tower_lon = tower_location.getLongitudeDeg();
 124     double scale = SG_METER_TO_NM * 200 / _radar_node->getDoubleValue();
 125
 126     for(FGRunway runway = runways->search(airport_name); runway._id == airport_name; runway = runways->next())
 127     {
 128         double az1, az2, dist_m;
 129         geo_inverse_wgs_84(tower_lat, tower_lon, runway._lat, runway._lon, &az1, &az2, &dist_m);
 130
 131         osg::Vec3 center = fromPolar(az1, dist_m * scale) + osg::Vec3(256, 256, 0);
 132         osg::Vec3 leftcenter = fromPolar(runway._heading, runway._length * SG_FEET_TO_METER * scale / 2) + center;
 133         osg::Vec3 lefttop = fromPolar(runway._heading - 90, runway._width * SG_FEET_TO_METER * scale / 2) + leftcenter;
 134         osg::Vec3 leftbottom = leftcenter * 2 - lefttop;
 135         osg::Vec3 rightbottom = center * 2 - lefttop;
 136         osg::Vec3 righttop = center * 2 - leftbottom;
 137
 138         osg::Vec3Array* vertices = runway._rwy_no[0] == 'x' ? taxi_vertices.get() : rwy_vertices.get();
 139         vertices->push_back(lefttop);
 140         vertices->push_back(leftbottom);
 141         vertices->push_back(rightbottom);
 142         vertices->push_back(righttop);
 143     }
 144
 145     osg::Vec3Array* vertices = new osg::Vec3Array(*taxi_vertices.get());
 146     vertices->insert(vertices->end(), rwy_vertices->begin(), rwy_vertices->end());
 147     _geom->setVertexArray(vertices);
 148     osg::DrawArrays* taxi = dynamic_cast<osg::DrawArrays*>(_geom->getPrimitiveSet(0));
 149     osg::DrawArrays* rwy = dynamic_cast<osg::DrawArrays*>(_geom->getPrimitiveSet(1));
 150     taxi->setCount(taxi_vertices->size());
 151     rwy->setFirst(taxi_vertices->size());
 152     rwy->setCount(rwy_vertices->size());
 153
 154     getCamera()->setNodeMask(0xffffffff);
 155 }
 156
 157 // end of GroundRadar.cxx