From: daveluff <daveluff>
Date: Tue, 23 Sep 2003 15:01:53 +0000 (+0000)
Subject: Implement two convienience functions.
X-Git-Url: https://git.mxchange.org/?a=commitdiff_plain;h=6665dcce822c959aa4910268c821f1fe160b5d10;p=flightgear.git

Implement two convienience functions.
---

diff --git a/src/ATC/ATCProjection.cxx b/src/ATC/ATCProjection.cxx
index 3a3a5f765..bce25f7f1 100644
--- a/src/ATC/ATCProjection.cxx
+++ b/src/ATC/ATCProjection.cxx
@@ -53,7 +53,10 @@ Point3D FGATCProjection::ConvertToLocal(Point3D pt) {
 }
 
 Point3D FGATCProjection::ConvertFromLocal(Point3D pt) {
-    return(Point3D(0,0,0));
+	double delta_lat = asin(pt.y() / SG_EQUATORIAL_RADIUS_M) * DCL_RADIANS_TO_DEGREES;
+	double delta_lon = (asin(pt.x() / SG_EQUATORIAL_RADIUS_M) * DCL_RADIANS_TO_DEGREES) / correction_factor;
+	
+    return(Point3D(origin.lon()+delta_lon, origin.lat()+delta_lat, 0.0));
 }
 
 /**********************************************************************************/
@@ -91,7 +94,14 @@ Point3D FGATCAlignedProjection::ConvertToLocal(Point3D pt) {
     return(Point3D(x,y,0.0));
 }
 
-// TODO - IMPLEMENT ME!!!
 Point3D FGATCAlignedProjection::ConvertFromLocal(Point3D pt) {
-    return(Point3D(0,0,0));
+	// de-align
+	double x = (pt.x() + pt.y()*sin(theta)) / cos(theta);
+	double y = (pt.y() - pt.x()*sin(theta)) / cos(theta);
+	
+	// convert from orthogonal to lat/lon
+	double delta_lat = asin(y / SG_EQUATORIAL_RADIUS_M) * DCL_RADIANS_TO_DEGREES;
+	double delta_lon = (asin(x / SG_EQUATORIAL_RADIUS_M) * DCL_RADIANS_TO_DEGREES) / correction_factor;
+	
+    return(Point3D(origin.lon()+delta_lon, origin.lat()+delta_lat, 0.0));
 }
diff --git a/src/ATC/ATCProjection.hxx b/src/ATC/ATCProjection.hxx
index 137b39893..04c31ce00 100644
--- a/src/ATC/ATCProjection.hxx
+++ b/src/ATC/ATCProjection.hxx
@@ -32,10 +32,10 @@ public:
 
     void Init(Point3D centre);
 
-    // Convert a lat/lon co-ordinate to the local projection
+    // Convert a lat/lon co-ordinate (degrees) to the local projection (meters)
     Point3D ConvertToLocal(Point3D pt);
 
-    // Convert a local projection co-ordinate to lat/lon
+    // Convert a local projection co-ordinate (meters) to lat/lon (degrees)
     Point3D ConvertFromLocal(Point3D pt);
 
 private:
@@ -55,10 +55,10 @@ public:
 
     void Init(Point3D centre, double heading);
 
-    // Convert a lat/lon co-ordinate to the local projection
+    // Convert a lat/lon co-ordinate (degrees) to the local projection (meters)
     Point3D ConvertToLocal(Point3D pt);
 
-    // Convert a local projection co-ordinate to lat/lon
+    // Convert a local projection co-ordinate (meters) to lat/lon (degrees)
     Point3D ConvertFromLocal(Point3D pt);
 
 private: