Vector layers and styling

[gpl/argeo-suite.git] / org.argeo.app.geo / src / org / argeo / app / geo / GeoUtils.java

diff --git a/org.argeo.app.geo/src/org/argeo/app/geo/GeoUtils.java b/org.argeo.app.geo/src/org/argeo/app/geo/GeoUtils.java
index 3cec484c2f14d358f86b2cb66bbcab8bb8ee51c4..8f971291aeb49c877e145bee691ff92ea87dac51 100644 (file)
--- a/org.argeo.app.geo/src/org/argeo/app/geo/GeoUtils.java
+++ b/org.argeo.app.geo/src/org/argeo/app/geo/GeoUtils.java
@@ -32,6 +32,7 @@ import org.geotools.styling.FeatureTypeConstraint;
 import org.geotools.styling.FeatureTypeStyle;
 import org.geotools.styling.Fill;
 import org.geotools.styling.Graphic;
+import org.geotools.styling.NamedLayer;
 import org.geotools.styling.PointSymbolizer;
 import org.geotools.styling.Rule;
 import org.geotools.styling.Stroke;
@@ -176,7 +177,11 @@ public class GeoUtils {
                }
        }
 
-       public static org.opengis.style.Style createStyleFromCss(String css) {
+       /*
+        * STYLING
+        */
+
+       public static Style createStyleFromCss(String css) {
                Stylesheet ss = CssParser.parse(css);
                CssTranslator translator = new CssTranslator();
                org.opengis.style.Style style = translator.translate(ss);
@@ -190,31 +195,32 @@ public class GeoUtils {
 //                     e.printStackTrace();
 //             }
 
-               return style;
+               return (Style) style;
        }
 
        public static String createSldFromCss(String name, String title, String css) {
-
-               StyleFactory sf = CommonFactoryFinder.getStyleFactory();
-
-               StyledLayerDescriptor sld = sf.createStyledLayerDescriptor();
+               StyledLayerDescriptor sld = GeoTools.STYLE_FACTORY.createStyledLayerDescriptor();
                sld.setName(name);
                sld.setTitle(title);
 
-               UserLayer layer = sf.createUserLayer();
-               layer.setName("default");
+               NamedLayer layer = GeoTools.STYLE_FACTORY.createNamedLayer();
+               layer.setName(name);
 
-               org.opengis.style.Style style = createStyleFromCss(css);
-               layer.userStyles().add((Style) style);
+               Style style = createStyleFromCss(css);
+               layer.styles().add(style);
 
                sld.layers().add(layer);
+               return sldToXml(sld);
+       }
+
+       public static String sldToXml(StyledLayerDescriptor sld) {
                try {
                        SLDTransformer styleTransform = new SLDTransformer();
                        String xml = styleTransform.transform(sld);
 //                     System.out.println(xml);
                        return xml;
                } catch (TransformerException e) {
-                       throw new IllegalStateException(e);
+                       throw new IllegalStateException("Cannot write SLD as XML", e);
                }
        }
 
@@ -335,6 +341,14 @@ public class GeoUtils {
 
        }
 
+       public static long getScaleFromResolution(long resolution) {
+               // see https://gis.stackexchange.com/questions/242424/how-to-get-map-units-to-find-current-scale-in-openlayers
+               final double INCHES_PER_UNIT = 39.37;// m
+               // final double INCHES_PER_UNIT = 4374754;// dd
+               final long DOTS_PER_INCH = 72;
+               return Math.round(INCHES_PER_UNIT * DOTS_PER_INCH * resolution);
+       }
+
        /** Singleton. */
        private GeoUtils() {
        }