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// Copyright 2009, Google Inc. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
// 3. Neither the name of Google Inc. nor the names of its contributors may be
// used to endorse or promote products derived from this software without
// specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
// WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
// EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
// OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
// WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
// OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
// ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// This sample program creates a polygon representation of a great circle.
// You can define the circle either by a point and a radius from that point,
// or by a central point and a point on the circumference.
#include <iostream>
#include <vector>
#include "kml/dom.h"
#include "kml/base/math_util.h"
#include "kml/base/vec3.h"
#include "kml/convenience/convenience.h"
using kmldom::KmlFactory;
using kmldom::LinearRingPtr;
using kmldom::CoordinatesPtr;
using kmldom::PlacemarkPtr;
using std::cout;
using std::cerr;
using std::endl;
// The number of lines composing the circumference of the circle.
static const size_t kSegments = 360;
// Creates a LinearRing that is the great circle described by a constant
// radius from lat, lng.
static LinearRingPtr CircleFromPointAndRadius(double lat, double lng,
double radius) {
CoordinatesPtr coords = kmlconvenience::CreateCoordinatesCircle(
lat, lng, radius, kSegments);
LinearRingPtr lr = KmlFactory::GetFactory()->CreateLinearRing();
lr->set_coordinates(coords);
return lr;
}
// Creates a LinearRing that is the great circle described by a circumfrential
// point (circum_lat, circum_lng) from a central point (center_lat,
// center_lng).
static LinearRingPtr CircleFromTwoPoints(double center_lat, double center_lng,
double circum_lat, double circum_lng) {
double radius = kmlbase::DistanceBetweenPoints(center_lat, center_lng,
circum_lat, circum_lng);
return CircleFromPointAndRadius(center_lat, center_lng, radius);
}
// Generate the Polygon circle and print to stdout.
static int PrintPlacemarkCircle(LinearRingPtr lr) {
PlacemarkPtr p = kmlconvenience::CreateBasicPolygonPlacemark(lr);
cout << kmldom::SerializePretty(p);
return 0;
}
static int DoPointRadius(double lat, double lng, double radius) {
LinearRingPtr lr = CircleFromPointAndRadius(lat, lng, radius);
return PrintPlacemarkCircle(lr);
}
static int DoTwoPoints(double lat1, double lng1, double lat2, double lng2) {
LinearRingPtr lr = CircleFromTwoPoints(lat1, lng1, lat2, lng2);
return PrintPlacemarkCircle(lr);
}
int main(int argc, char** argv) {
if (argc !=4 && argc !=5 ) {
cerr << "Supply either a central point (lat, lng in decimal degrees) " <<
"and a radius (in meters) OR a central point and a point on " <<
"the circumference" << endl;
cerr << "usage: " << argv[0] << " center-lat center-lng radius" << endl;
cerr << "usage: " << argv[0] << " center-lat center-lng circum-lat " <<
"circum-lng" << endl;
cerr << endl;
return 1;
}
double center_lat = strtod(argv[1], NULL);
double center_lng = strtod(argv[2], NULL);
if (argc == 4) {
double radius = strtod(argv[3], NULL);
return DoPointRadius(center_lat, center_lng, radius);
}
if (argc == 5) {
double circum_lat = strtod(argv[3], NULL);
double circum_lng = strtod(argv[4], NULL);
return DoTwoPoints(center_lat, center_lng, circum_lat, circum_lng);
}
}
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