X-Git-Url: https://git.argeo.org/?a=blobdiff_plain;f=org.argeo.app.core%2Fsrc%2Forg%2Fargeo%2Fapp%2Fgeo%2FGpxUtils.java;fp=org.argeo.app.core%2Fsrc%2Forg%2Fargeo%2Fapp%2Fgeo%2FGpxUtils.java;h=be028d3f4a79bd65be30b935514074920b81b94d;hb=07d4329086be993ff25fc6342c97b681b2e07433;hp=0000000000000000000000000000000000000000;hpb=2ac2baf40fd2fece9cbbd063c984aed4b67f2e20;p=gpl%2Fargeo-suite.git

diff --git a/org.argeo.app.core/src/org/argeo/app/geo/GpxUtils.java b/org.argeo.app.core/src/org/argeo/app/geo/GpxUtils.java
new file mode 100644
index 0000000..be028d3
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+++ b/org.argeo.app.core/src/org/argeo/app/geo/GpxUtils.java
@@ -0,0 +1,68 @@
+package org.argeo.app.geo;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.ArrayList;
+import java.util.List;
+
+import javax.xml.parsers.ParserConfigurationException;
+import javax.xml.parsers.SAXParser;
+import javax.xml.parsers.SAXParserFactory;
+
+import org.geotools.data.DataUtilities;
+import org.geotools.feature.SchemaException;
+import org.geotools.feature.simple.SimpleFeatureBuilder;
+import org.geotools.geometry.jts.JTSFactoryFinder;
+import org.locationtech.jts.geom.Coordinate;
+import org.locationtech.jts.geom.GeometryFactory;
+import org.locationtech.jts.geom.Polygon;
+import org.opengis.feature.simple.SimpleFeature;
+import org.opengis.feature.simple.SimpleFeatureType;
+import org.xml.sax.Attributes;
+import org.xml.sax.SAXException;
+import org.xml.sax.helpers.DefaultHandler;
+
+/** Utilities around the GPX format. */
+public class GpxUtils {
+
+	public static SimpleFeature parseGpxToPolygon(InputStream in) {
+		try {
+			final SimpleFeatureType TYPE = DataUtilities.createType("Area", "the_geom:Polygon:srid=4326");
+			SimpleFeatureBuilder featureBuilder = new SimpleFeatureBuilder(TYPE);
+
+			GeometryFactory geometryFactory = JTSFactoryFinder.getGeometryFactory();
+			List<Coordinate> coordinates = new ArrayList<>();
+			SAXParserFactory factory = SAXParserFactory.newInstance();
+			Double[] startCoord = new Double[2];
+			SAXParser saxParser = factory.newSAXParser();
+
+			saxParser.parse(in, new DefaultHandler() {
+
+				@Override
+				public void startElement(String uri, String localName, String qName, Attributes attributes)
+						throws SAXException {
+					if ("trkpt".equals(qName)) {
+						Double latitude = Double.parseDouble(attributes.getValue("lat"));
+						Double longitude = Double.parseDouble(attributes.getValue("lon"));
+						Coordinate coordinate = new Coordinate(longitude, latitude);
+						coordinates.add(coordinate);
+					}
+				}
+
+			});
+			// close the line string
+			coordinates.add(coordinates.get(0));
+
+			Polygon polygon = geometryFactory.createPolygon(coordinates.toArray(new Coordinate[coordinates.size()]));
+			featureBuilder.add(polygon);
+			SimpleFeature area = featureBuilder.buildFeature(null);
+			return area;
+		} catch (ParserConfigurationException | SAXException | IOException | SchemaException e) {
+			throw new RuntimeException("Cannot convert GPX", e);
+		}
+	}
+
+	/** Singleton. */
+	private GpxUtils() {
+	}
+}