It depends on the version of GeoTools you are using - prior to 20.x you need a com.vividsolutions one after that an org.locationtech one. See https://docs.geotools.org/stable/userguide/welcome/upgrade.html for more information.
Ian On Tue, 4 Feb 2020 at 06:35, <paul.m...@lfv.se> wrote: > Just a one more question, please. > > What type of Point is centre, start and end, > com.vividsolutions.jts.geom.point or org.locationtech.jts.geom.Point*.* > > Sorry but I know too little about the different libraries. > > > > *Från:* Ian Turton [mailto:ijtur...@gmail.com] > *Skickat:* den 3 februari 2020 12:14 > *Till:* Malm, Paul (Operations AIM) > *Kopia:* geotools-users > *Ämne:* Re: [Geotools-gt2-users] Calculate points on an arc > > > > You can use the org.geotools.referencing.GeodeticCalculator to do this, > something like: > > > > private void createPolygon(Point centre, Point start, Point end) { > ArrayList<Coordinate> coords = new ArrayList<>(); > coords.add(start.getCoordinate()); > CALC.setStartingGeographicPoint(centre.getX(), centre.getY()); > CALC.setDestinationGeographicPoint(start.getX(), start.getY()); > double bearing1 = CALC.getAzimuth(); > double radius = CALC.getOrthodromicDistance(); > CALC.setDestinationGeographicPoint(end.getX(), end.getY()); > double bearing2 = CALC.getAzimuth(); > > double angle = bearing2 - bearing1; > int nSteps = 10; > double dStep = angle / nSteps; > coords.add(start.getCoordinate()); > for (int i = 0; i < nSteps; i++) { > CALC.setDirection((bearing1 + (i * dStep)), radius); > Point2D p = CALC.getDestinationGeographicPoint(); > coords.add(new Coordinate(p.getX(), p.getY())); > } > coords.add(end.getCoordinate()); > LineString line = GF.createLineString(coords.toArray(new Coordinate[] > {})); > WKTWriter writer = new WKTWriter(); > System.out.println(writer.write(centre)); > System.out.println(writer.write(start)); > System.out.println(writer.write(end)); > System.out.println(writer.write(line)); > } > > > > Where CALC is a GeodeticCalculator and GF is a GeometryFactory will give > you: > > > > [image: arc.png] > > > > Ian > > > > On Mon, 3 Feb 2020 at 09:21, <paul.m...@lfv.se> wrote: > > Hi list, > > I would like to draw a circle arc in WGS84 coordinates > > I have an arc start point (lat/lon in WGS84), > > an arc end point (lat/lon in WGS84), > > an arc center point (lat/lon in WGS84), > > a bearing from the center point to the start point > > the arc radius in meter. > > Now I would like to calculate several points (WGS84 lat/lon) on the arc. > > Is there a way to do it with Geotools, if so how? > > > > I appreciate your help, > > Paul > > _______________________________________________ > GeoTools-GT2-Users mailing list > GeoTools-GT2-Users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/geotools-gt2-users > > > > > -- > > Ian Turton > -- Ian Turton
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