fly/flightgear
1
0
Fork 0
Code Activity

httpd navdb: report ils/loc as geojson multilinestring

Browse source
This commit is contained in:
Torsten Dreyer 2014-03-21 13:00:59 +01:00
parent 58c01b112e
commit 527eb9d444
1 changed files with 75 additions and 3 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

78
src/Network/http/NavdbUriHandler.cxx
View file

@ -20,7 +20,7 @@
#include "NavdbUriHandler.hxx"
#include <simgear/debug/logstream.hxx>
#include <Navaids/positioned.hxx>
#include <Navaids/navrecord.hxx>
#include <3rdparty/cjson/cJSON.h>
#include <boost/lexical_cast.hpp>
@ -31,11 +31,64 @@ namespace http {
//Ref: http://geojson.org/
static cJSON * createPosition(double x, double y)
{
cJSON * p = cJSON_CreateArray();
cJSON_AddItemToArray(p, cJSON_CreateNumber(x));
cJSON_AddItemToArray(p, cJSON_CreateNumber(y));
return p;
}
static cJSON * createGeometryFor(FGNavRecord * navRecord)
{
if ( NULL == navRecord) return NULL;
cJSON * geometry = cJSON_CreateObject();
if (navRecord->type() == FGPositioned::LOC || navRecord->type() == FGPositioned::ILS) {
int range = navRecord->get_range();
double width = navRecord->localizerWidth();
double course = navRecord->get_multiuse();
double px[4];
double py[4];
px[0] = navRecord->longitude();
py[0] = navRecord->latitude();
for (int i = -1; i <= +1; i++) {
double c = SGMiscd::normalizeAngle((course + 180 + i*width/2 ) * SG_DEGREES_TO_RADIANS);
SGGeoc geoc = SGGeoc::fromGeod(navRecord->geod());
SGGeod p2 = SGGeod::fromGeoc(geoc.advanceRadM(c, range * SG_NM_TO_METER));
px[i+2] = p2.getLongitudeDeg();
py[i+2] = p2.getLatitudeDeg();
}
// Add three lines: centerline, left and right edge
cJSON_AddItemToObject(geometry, "type", cJSON_CreateString("MultiLineString"));
cJSON * coordinates = cJSON_CreateArray();
cJSON_AddItemToObject(geometry, "coordinates", coordinates);
for (int i = 1; i < 4; i++) {
cJSON * line = cJSON_CreateArray();
cJSON_AddItemToArray(coordinates, line);
cJSON_AddItemToArray(line, createPosition(px[0], py[0]));
cJSON_AddItemToArray(line, createPosition(px[i], py[i]));
}
} else {
cJSON_AddItemToObject(geometry, "type", cJSON_CreateString("Point"));
cJSON_AddItemToObject(geometry, "coordinates", createPosition(navRecord->longitude(), navRecord->latitude()));
}
return geometry;
}
static cJSON * createGeometryFor(FGPositionedRef positioned)
{
// for now, we are lazy - everything is just a point.
cJSON * geometry = createGeometryFor(dynamic_cast<FGNavRecord*>(positioned.get()));
if ( NULL != geometry) return geometry;
cJSON * geometry = cJSON_CreateObject();
geometry = cJSON_CreateObject();
cJSON_AddItemToObject(geometry, "type", cJSON_CreateString("Point"));
cJSON * coordinates = cJSON_CreateArray();
@ -54,6 +107,24 @@ static cJSON * createPropertiesFor(FGPositionedRef positioned)
cJSON_AddItemToObject(properties, "name", cJSON_CreateString(positioned->name().c_str()));
cJSON_AddItemToObject(properties, "type", cJSON_CreateString(positioned->typeString()));
cJSON_AddItemToObject(properties, "elevation-m", cJSON_CreateNumber(positioned->elevationM()));
FGNavRecord * navRecord = dynamic_cast<FGNavRecord*>(positioned.get());
if ( NULL != navRecord) {
cJSON_AddItemToObject(properties, "range-nm", cJSON_CreateNumber(navRecord->get_range()));
cJSON_AddItemToObject(properties, "frequency", cJSON_CreateNumber((double) navRecord->get_freq() / 100.0));
switch (navRecord->type()) {
case FGPositioned::ILS:
cJSON_AddItemToObject(properties, "localizer-course", cJSON_CreateNumber(navRecord->get_multiuse()));
break;
case FGPositioned::VOR:
cJSON_AddItemToObject(properties, "variation", cJSON_CreateNumber(navRecord->get_multiuse()));
break;
default:
break;
}
}
return properties;
}
@ -81,6 +152,7 @@ static cJSON * createFeatureFor(FGPositionedRef positioned)
bool NavdbUriHandler::handleRequest(const HTTPRequest & request, HTTPResponse & response)
{
response.Header["Content-Type"] = "application/json; charset=UTF-8";
bool indent = request.RequestVariables.get("i") == "y";