AER-1298 Add support for min/max layer scale and add tile grid extent (…

…#47)

gwt-client-geo-ol3/src/main/java/nl/aerius/geo/wui/util/OL3GeometryUtil.java

@@ -31,13 +31,19 @@
 import ol.geom.LineString;
 import ol.geom.Point;
 import ol.geom.Polygon;
+import ol.proj.Projection;
 
 import nl.overheid.aerius.geo.shared.BBox;
 
 public final class OL3GeometryUtil {
 
   public static final int WKT_DECIMALS = 2;
 
+  /**
+   * Magic constant extracted from the OpenLayers source code
+   */
+  private static final double PIXEL_SIZE_IN_METERS = 0.28e-3;
+
   private static final Wkt WKT = new Wkt();
 
   private OL3GeometryUtil() {}
@@ -162,4 +168,13 @@ private static Coordinate offsetCoordinate(final Coordinate original, final doub
         -Math.cos(direction) * distance + original.getY());
   }
 
+  /**
+   * Convert a number denoting the scale to the resolution number used by OL3
+   * @param scale scale to convert
+   * @param projection projecten to return meters per unit
+   * @return resolution
+   */
+  public static double scaleToResolution(final double scale, final Projection projection) {
+    return (scale * OL3GeometryUtil.PIXEL_SIZE_IN_METERS) / projection.getMetersPerUnit();
+  }
 }

gwt-client-geo-ol3/src/main/java/nl/aerius/geo/wui/util/OL3MapLayerFactory.java

@@ -83,6 +83,13 @@ public IsLayer<Layer> prepareLayer(final LayerProps c) {
     layer.getInfo().setName(c.getName());
     layer.getInfo().setBundle(c.getBundleName());
 
+    final Projection projection = layer.asLayer().getSource().getProjection();
+    if (c.getMinScale() != null && projection != null) {
+      layer.asLayer().setMinResolution(OL3GeometryUtil.scaleToResolution(c.getMinScale(), projection));
+    }
+    if (c.getMaxScale() != null && projection != null) {
+      layer.asLayer().setMaxResolution(OL3GeometryUtil.scaleToResolution(c.getMaxScale(), projection));
+    }
     return layer;
   }
 

gwt-client-geo-ol3/src/main/java/nl/aerius/geo/wui/util/OL3WmtsTileGridUtil.java

@@ -19,44 +19,42 @@
 import java.util.List;
 
 import ol.Coordinate;
+import ol.Extent;
 import ol.OLFactory;
 import ol.proj.Projection;
 import ol.tilegrid.WmtsTileGrid;
 import ol.tilegrid.WmtsTileGridOptions;
 
 public final class OL3WmtsTileGridUtil {
 
-  /**
-   * Magic constant extracted from the OpenLayers source code
-   */
-  private static final double PIXEL_SIZE_IN_METERS = 0.28e-3;
-
   private OL3WmtsTileGridUtil() {
   }
 
   /**
-   * Constructs a WmtsTileGrid from a resolutions list, origin and projection
+   * Constructs a WmtsTileGrid from a scale list, origin and projection
    *
-   * @param resolutionList resolutions list (size determines number of zoomlevels)
+   * @param scaleList scale list (size determines number of zoomlevels)
    * @param origin origin of the tile grid
    * @param projection projection of the tile grid
+   * @param extent extent of the tile grid
    * @return constructed WmtsTileGrid
    */
-  public static WmtsTileGrid createWmtsTileGrid(final List<Double> resolutionList, final Coordinate origin,
-      final Projection projection) {
+  public static WmtsTileGrid createWmtsTileGrid(final List<Double> scaleList, final Coordinate origin,
+      final Projection projection, final Extent extent) {
     final WmtsTileGridOptions wmtsTileGridOptions = OLFactory.createOptions();
 
-    final double[] resolutions = new double[resolutionList.size()];
-    final String[] matrixIds = new String[resolutionList.size()];
+    final double[] resolutions = new double[scaleList.size()];
+    final String[] matrixIds = new String[scaleList.size()];
 
-    for (int i = 0; i < resolutionList.size(); i++) {
+    for (int i = 0; i < scaleList.size(); i++) {
       matrixIds[i] = String.valueOf(i);
-      resolutions[i] = (resolutionList.get(i) * PIXEL_SIZE_IN_METERS) / projection.getMetersPerUnit();
+      resolutions[i] = OL3GeometryUtil.scaleToResolution(scaleList.get(i), projection);
     }
 
     wmtsTileGridOptions.setOrigin(origin);
     wmtsTileGridOptions.setResolutions(resolutions);
     wmtsTileGridOptions.setMatrixIds(matrixIds);
+    wmtsTileGridOptions.setExtent(extent);
 
     return new WmtsTileGrid(wmtsTileGridOptions);
   }

gwt-client-geo-ol3/src/main/java/nl/aerius/geo/wui/util/RDNewWmtsTileGrid.java

@@ -20,12 +20,13 @@
 import java.util.List;
 
 import ol.Coordinate;
+import ol.Extent;
 import ol.proj.Projection;
 import ol.tilegrid.WmtsTileGrid;
 
 public final class RDNewWmtsTileGrid {
 
-  private static final List<Double> RESOLUTIONS = Arrays.asList(
+  private static final List<Double> SCALES = Arrays.asList(
       12288000.0,
       6144000.0,
       3072000.0,
@@ -46,10 +47,12 @@ public final class RDNewWmtsTileGrid {
 
   public static final List<String> PROJECTIONS = Arrays.asList("EPSG:28992");
 
+  private static final Extent EXTENT = Extent.create(482.06, 306602.42, 284182.97, 637049.52);
+
   private RDNewWmtsTileGrid() {
   }
 
   public static WmtsTileGrid getTileGrid() {
-    return OL3WmtsTileGridUtil.createWmtsTileGrid(RESOLUTIONS, ORIGIN, Projection.get(PROJECTIONS.get(0)));
+    return OL3WmtsTileGridUtil.createWmtsTileGrid(SCALES, ORIGIN, Projection.get(PROJECTIONS.get(0)), EXTENT);
   }
 }

gwt-client-geo-ol3/src/main/java/nl/aerius/geo/wui/util/TM75WmtsTileGrid.java

@@ -20,12 +20,13 @@
 import java.util.List;
 
 import ol.Coordinate;
+import ol.Extent;
 import ol.proj.Projection;
 import ol.tilegrid.WmtsTileGrid;
 
 public final class TM75WmtsTileGrid {
 
-  private static final List<Double> RESOLUTIONS = Arrays.asList(
+  private static final List<Double> SCALES = Arrays.asList(
       1889884.7321501793,
       1417413.5491126343,
       1039436.6026825986,
@@ -49,10 +50,12 @@ public final class TM75WmtsTileGrid {
    */
   public static final List<String> PROJECTION = Arrays.asList("EPSG:29902", "EPSG:29903");
 
+  private static final Extent EXTENT = Extent.create(180000.0, 290000.0, 380000.0, 470000.0);
+
   private TM75WmtsTileGrid() {
   }
 
   public static WmtsTileGrid getTileGrid() {
-    return OL3WmtsTileGridUtil.createWmtsTileGrid(RESOLUTIONS, ORIGIN, Projection.get(PROJECTION.get(0)));
+    return OL3WmtsTileGridUtil.createWmtsTileGrid(SCALES, ORIGIN, Projection.get(PROJECTION.get(0)), EXTENT);
   }
 }

gwt-shared-geo-common/src/main/java/nl/aerius/geo/shared/LayerProps.java

@@ -35,16 +35,16 @@ public class LayerProps implements Serializable {
   private String name;
 
   /**
-   * The minimum scale at which data will be visible. If scale becomes larger nothing will be shown. If the value is < 0 it means there is no min
+   * The minimum scale at which data will be visible. If scale becomes larger nothing will be shown. If the value is null it means there is no min
    * scale.
    */
-  private float minScale;
+  private Double minScale;
 
   /**
-   * The maximum scale for which data is available. If scale comes below this value nothing will be shown. If the value is < 0 it means there is no
+   * The maximum scale for which data is available. If scale comes below this value nothing will be shown. If the value is null it means there is no
    * max scale.
    */
-  private float maxScale;
+  private Double maxScale;
 
   /**
    * The begin year at which data starts becoming visible. If not set, but end year is, everything &lt;= end year is allowed.
@@ -110,11 +110,11 @@ public String getName() {
     return name;
   }
 
-  public float getMinScale() {
+  public Double getMinScale() {
     return minScale;
   }
 
-  public float getMaxScale() {
+  public Double getMaxScale() {
     return maxScale;
   }
 
@@ -162,11 +162,11 @@ public void setName(final String name) {
     this.name = name;
   }
 
-  public void setMinScale(final float minScale) {
+  public void setMinScale(final Double minScale) {
     this.minScale = minScale;
   }
 
-  public void setMaxScale(final float maxScale) {
+  public void setMaxScale(final Double maxScale) {
     this.maxScale = maxScale;
   }