64 lines
No EOL
2.4 KiB
C++
64 lines
No EOL
2.4 KiB
C++
// Utility functions for the ATC / AI system
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#include <math.h>
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#include <simgear/math/point3d.hxx>
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#include <simgear/constants.h>
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#include <plib/sg.h>
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// Given two positions, get the HORIZONTAL separation (in meters)
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double dclGetHorizontalSeparation(Point3D pos1, Point3D pos2) {
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double x; //East-West separation
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double y; //North-South separation
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double z; //Horizontal separation - z = sqrt(x^2 + y^2)
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double lat1 = pos1.lat() * SG_DEGREES_TO_RADIANS;
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double lon1 = pos1.lon() * SG_DEGREES_TO_RADIANS;
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double lat2 = pos2.lat() * SG_DEGREES_TO_RADIANS;
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double lon2 = pos2.lon() * SG_DEGREES_TO_RADIANS;
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y = sin(fabs(lat1 - lat2)) * SG_EQUATORIAL_RADIUS_M;
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x = sin(fabs(lon1 - lon2)) * SG_EQUATORIAL_RADIUS_M * (cos((lat1 + lat2) / 2.0));
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z = sqrt(x*x + y*y);
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return(z);
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}
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// Given a position (lat/lon/elev), heading, vertical angle, and distance, calculate the new position.
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// Assumes that the ground is not hit!!! Expects heading and angle in degrees, distance in meters.
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Point3D dclUpdatePosition(Point3D pos, double heading, double angle, double distance) {
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double lat = pos.lat() * SG_DEGREES_TO_RADIANS;
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double lon = pos.lon() * SG_DEGREES_TO_RADIANS;
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double elev = pos.elev();
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double horiz_dist = distance * cos(angle);
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double vert_dist = distance * sin(angle);
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double north_dist = horiz_dist * cos(heading);
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double east_dist = horiz_dist * sin(heading);
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lat += asin(north_dist / SG_EQUATORIAL_RADIUS_M);
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lon += asin(east_dist / SG_EQUATORIAL_RADIUS_M) * (1.0 / cos(lat)); // I suppose really we should use the average of the original and new lat but we'll assume that this will be good enough.
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elev += vert_dist;
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return(Point3D(lon*SG_RADIANS_TO_DEGREES, lat*SG_RADIANS_TO_DEGREES, elev));
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}
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#if 0
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/* Determine location in runway coordinates */
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Radius_to_rwy = Sea_level_radius + Runway_altitude;
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cos_rwy_hdg = cos(Runway_heading*DEG_TO_RAD);
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sin_rwy_hdg = sin(Runway_heading*DEG_TO_RAD);
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D_cg_north_of_rwy = Radius_to_rwy*(Latitude - Runway_latitude);
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D_cg_east_of_rwy = Radius_to_rwy*cos(Runway_latitude)
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*(Longitude - Runway_longitude);
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D_cg_above_rwy = Radius_to_vehicle - Radius_to_rwy;
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X_cg_rwy = D_cg_north_of_rwy*cos_rwy_hdg
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+ D_cg_east_of_rwy*sin_rwy_hdg;
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Y_cg_rwy =-D_cg_north_of_rwy*sin_rwy_hdg
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+ D_cg_east_of_rwy*cos_rwy_hdg;
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H_cg_rwy = D_cg_above_rwy;
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#endif
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