src/Instrumentation/groundradar.cxx

   1 //  groundradar.cxx - Background layer for the ATC radar.
   2 //
   3 //  Copyright (C) 2007 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_source_node_name = "airport-id-source";
  45 static const char* default_airport_node_name = "/sim/tower/airport-id";
  46 static const char* texture_node_name = "texture-name";
  47 static const char* default_texture_name = "Aircraft/Instruments/Textures/od_groundradar.rgb";
  48 static const char* range_source_node_name = "range-source";
  49 static const char* default_range_node_name = "/instrumentation/radar/range";
  50
  51 struct SingleFrameCallback : public osg::Camera::DrawCallback
  52 {
  53     virtual void operator () (const osg::Camera& camera) const
  54     {
  55         const_cast<osg::Camera&>(camera).setNodeMask(0);
  56     }
  57 };
  58
  59 GroundRadar::GroundRadar(SGPropertyNode *node)
  60 {
  61     _airport_node = fgGetNode(node->getStringValue(airport_source_node_name, default_airport_node_name), true);
  62     _range_node = fgGetNode(node->getStringValue(range_source_node_name, default_range_node_name), true);
  63     createTexture(node->getStringValue(texture_node_name, default_texture_name));
  64     updateTexture();
  65     _airport_node->addChangeListener(this);
  66     _range_node->addChangeListener(this);
  67 }
  68
  69 GroundRadar::~GroundRadar()
  70 {
  71     _airport_node->removeChangeListener(this);
  72     _range_node->removeChangeListener(this);
  73 }
  74
  75 void GroundRadar::valueChanged(SGPropertyNode*)
  76 {
  77     updateTexture();
  78 }
  79
  80 inline static osg::Vec3 fromPolar(double fi, double r)
  81 {
  82     return osg::Vec3(sin(fi * SGD_DEGREES_TO_RADIANS) * r, cos(fi * SGD_DEGREES_TO_RADIANS) * r, 0);
  83 }
  84
  85 void GroundRadar::createTexture(const char* texture_name)
  86 {
  87     setSize(512);
  88     allocRT();
  89
  90     osg::Vec4Array* colors = new osg::Vec4Array;
  91     colors->push_back(osg::Vec4(0.0f, 0.5f, 0.0f, 1.0f));
  92     colors->push_back(osg::Vec4(0.0f, 0.5f, 0.5f, 1.0f));
  93
  94     _geom = new osg::Geometry();
  95     _geom->setColorArray(colors);
  96     _geom->setColorBinding(osg::Geometry::BIND_PER_PRIMITIVE_SET);
  97     _geom->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::QUADS, 0, 0));
  98     _geom->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::QUADS, 0, 0));
  99
 100     osg::Geode* geode = new osg::Geode();
 101     osg::StateSet* stateset = geode->getOrCreateStateSet();
 102     stateset->setMode(GL_BLEND, osg::StateAttribute::OFF);
 103     geode->addDrawable(_geom.get());
 104
 105     osg::Camera* camera = getCamera();
 106     camera->setPostDrawCallback(new SingleFrameCallback());
 107     camera->addChild(geode);
 108     camera->setNodeMask(0);
 109     camera->setProjectionMatrixAsOrtho2D(0, getTexture()->getTextureWidth(), 0, getTexture()->getTextureHeight());
 110
 111     // Texture in the 2D panel system
 112     FGTextureManager::addTexture(texture_name, getTexture());
 113 }
 114
 115 void GroundRadar::updateTexture()
 116 {
 117     osg::ref_ptr<osg::Vec3Array> rwy_vertices = new osg::Vec3Array;
 118     osg::ref_ptr<osg::Vec3Array> taxi_vertices = new osg::Vec3Array;
 119
 120     const string airport_name = _airport_node->getStringValue();
 121     FGRunwayList* runways = globals->get_runways();
 122
 123     const FGAirport* airport = fgFindAirportID(airport_name);
 124     if (airport == 0)
 125         return;
 126
 127     const SGGeod& tower_location = airport->getTowerLocation();
 128     const double tower_lat = tower_location.getLatitudeDeg();
 129     const double tower_lon = tower_location.getLongitudeDeg();
 130     double scale = SG_METER_TO_NM * 200 / _range_node->getDoubleValue();
 131
 132     for (FGRunway runway = runways->search(airport_name); runway._id == airport_name; runway = runways->next())
 133     {
 134         double az1, az2, dist_m;
 135         geo_inverse_wgs_84(tower_lat, tower_lon, runway._lat, runway._lon, &az1, &az2, &dist_m);
 136
 137         osg::Vec3 center = fromPolar(az1, dist_m * scale) + osg::Vec3(256, 256, 0);
 138         osg::Vec3 leftcenter = fromPolar(runway._heading, runway._length * SG_FEET_TO_METER * scale / 2) + center;
 139         osg::Vec3 lefttop = fromPolar(runway._heading - 90, runway._width * SG_FEET_TO_METER * scale / 2) + leftcenter;
 140         osg::Vec3 leftbottom = leftcenter * 2 - lefttop;
 141         osg::Vec3 rightbottom = center * 2 - lefttop;
 142         osg::Vec3 righttop = center * 2 - leftbottom;
 143
 144         osg::Vec3Array* vertices = runway._rwy_no[0] == 'x' ? taxi_vertices.get() : rwy_vertices.get();
 145         vertices->push_back(lefttop);
 146         vertices->push_back(leftbottom);
 147         vertices->push_back(rightbottom);
 148         vertices->push_back(righttop);
 149     }
 150
 151     osg::Vec3Array* vertices = new osg::Vec3Array(*taxi_vertices.get());
 152     vertices->insert(vertices->end(), rwy_vertices->begin(), rwy_vertices->end());
 153     _geom->setVertexArray(vertices);
 154     osg::DrawArrays* taxi = dynamic_cast<osg::DrawArrays*>(_geom->getPrimitiveSet(0));
 155     osg::DrawArrays* rwy = dynamic_cast<osg::DrawArrays*>(_geom->getPrimitiveSet(1));
 156     taxi->setCount(taxi_vertices->size());
 157     rwy->setFirst(taxi_vertices->size());
 158     rwy->setCount(rwy_vertices->size());
 159
 160     getCamera()->setNodeMask(0xffffffff);
 161 }
 162
 163 // end of GroundRadar.cxx