Forced Coordinate Display for LineString (Example) - More effective/better/flexible?

[Oliver Gottwald]

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Hi,

I'm continuing my efforts with forced coordinate display by integrating LineString.

In a prior example I did multiple coordinate display for Points.

What I’m wondering is if there is anything more effective/better/flexible I can do then below for displaying a series of coordinates via LineString.

One line specifically that I wonder if could be done better is the following:
final SimpleFeatureType TYPE = DataUtilities.createType("Location", "location:LineString,name:String");

Any input would be greatly appreciated. :-)

Oliver

=======

Below is my main source for forced coordinate LineString display.  Based on input from all you and alteration I will eventually put a full example on the forum.

public static void main(String[] args) throws Exception {
    final SimpleFeatureType TYPE = DataUtilities.createType("Location", "location:LineString,name:String");

    FeatureCollection collection = FeatureCollections.newCollection();

       
        double lon[] = {20.22, 30.33, 40.44};
        double lat[] = {20.22, 30.33, 40.44};
        String name="test";
       
        ArrayList cords = new ArrayList();

        for(int i=0;i<=2;i++){
            cords.add(new Coordinate(lon[i],lat[i]));
        }
        
        GeometryFactory factory = JTSFactoryFinder.getGeometryFactory(null);   
       
        CoordinateArrays ca = new CoordinateArrays();
        Coordinate[] cord = ca.toCoordinateArray(cords);
       
    LineString lineString = factory.createLineString(cord);
        SimpleFeature feature = SimpleFeatureBuilder.build( TYPE, new Object[]{lineString, name}, null );

    collection.add( feature );
       
        FeatureSource featureSource = DataUtilities.source(collection);
        MapContext map = new DefaultMapContext();
        map.setTitle("Quickstart");
        map.addLayer(featureSource, null);

        // Now display the map
        JMapFrame.showMap(map);
}


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[mbedward]

Hi Oliver,

I've meddled with your example a bit so that it generates one than one
feature and uses SimpleFeatureTypeBuilder (as shown in the CSV 2 SHP
Lab example at the bottom of the code).

public class Foo
    static final CoordinateReferenceSystem crs = DefaultGeographicCRS.WGS84;
    static final int MAX_NAME_LENGTH = 20;

    public static void main(String[] args) throws Exception {
        SimpleFeatureTypeBuilder typeBuilder = new SimpleFeatureTypeBuilder();
        typeBuilder.setName("mytype");
        typeBuilder.setCRS(crs);
        typeBuilder.add("route", LineString.class);
        typeBuilder.length(MAX_NAME_LENGTH).add("name", String.class);

        final SimpleFeatureType TYPE = typeBuilder.buildFeatureType();

        FeatureCollection collection = FeatureCollections.newCollection();

        double x[][] = {{10, 20, 30, 40, 50}, {10, 20, 30, 40, 50}};
        double y[][] = {{10, 20, 10, 20, 10}, {20, 30, 20, 30, 20}};
        String[] names = {"foo", "bar"};

        GeometryFactory factory = JTSFactoryFinder.getGeometryFactory(null);
        SimpleFeatureBuilder featureBuilder = new SimpleFeatureBuilder(TYPE);
        ArrayList<Coordinate> coordList = new ArrayList<Coordinate>();

        for (int line = 0; line < x.length; line++) {
            for (int i = 0; i < x[line].length; i++) {
                coordList.add(new Coordinate(x[line][i], y[line][i]));
            }

            Coordinate[] coords = CoordinateArrays.toCoordinateArray(coordList);
            LineString lineString = factory.createLineString(coords);

            featureBuilder.add(lineString);
            featureBuilder.add(names[line]);
            collection.add(featureBuilder.buildFeature(null));
            coordList.clear();
        }


        MapContext map = new DefaultMapContext();
        map.setTitle("My beautiful lines");
        map.addLayer(collection, null);

        // Now display the map
        JMapFrame.showMap(map);
    }
}

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[mbedward]

> it generates one than one feature

= it generates more than one feature

Brain not fully connected to fingers today.

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