원형 생성 utils 추가

src/main/java/com/palnet/comn/utils/FlightUtils.java

@@ -10,6 +10,7 @@ import org.locationtech.jts.geom.Polygon;
 import org.locationtech.jts.geom.impl.CoordinateArraySequence;
 import org.locationtech.jts.operation.buffer.BufferOp;
 import org.locationtech.jts.operation.buffer.BufferParameters;
+import org.locationtech.jts.util.GeometricShapeFactory;
 import org.locationtech.proj4j.BasicCoordinateTransform;
 import org.locationtech.proj4j.CRSFactory;
 import org.locationtech.proj4j.CoordinateReferenceSystem;
@@ -34,6 +35,24 @@ public class FlightUtils {
 
 		return bufferCoords;
 	}
+	//기본좌표와 반지름을 받아 원을 생성하는 유틸
+	public static Coordinate[] createCircle(Coordinate circleCoords) {
+		GeometricShapeFactory shapeFactory = new GeometricShapeFactory();
+		GeometryFactory geometryFactory = new GeometryFactory();
+		double lng = circleCoords.x;
+		double lat = circleCoords.y;
+		double diameterInMeters = circleCoords.z;
+		shapeFactory.setCentre(new Coordinate(lng , lat)); 
+		shapeFactory.setHeight((diameterInMeters * 2) / 111320d);
+		shapeFactory.setWidth((diameterInMeters * 2) / (40075000 * Math.cos(Math.toRadians(lat)) / 360));
+		shapeFactory.setNumPoints(64);
+		final Polygon circle = shapeFactory.createEllipse();
+		circle.setSRID(4326);
+		Geometry geometry = geometryFactory.createGeometry(circle);
+		Coordinate[] coords = geometry.getCoordinates();
+		return coords;
+		
+	}
 	//생성된 버퍼좌표에서 특정 좌표가 버퍼좌표 안에 속해있는지, 혹은 아닌지를 판단하는 유틸
 	public static boolean contains(Coordinate[] bufferCoords, Coordinate[] containsPoint) {