Adding in support for hit detection with canvas (and rendering holes in polygons). r=fredj (closes #3207)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@11849 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
2011-03-31 21:00:03 +00:00
parent 66dabae11b
commit 3ef0b05949
8 changed files with 733 additions and 120 deletions
--- a/examples/canvas-hit-detection.js
+++ b/examples/canvas-hit-detection.js
@@ -0,0 +1,88 @@
+
+// create some sample features
+var Feature = OpenLayers.Feature.Vector;
+var Geometry = OpenLayers.Geometry;
+var features = [
+    new Feature(new Geometry.Point(-90, 45)),
+    new Feature(
+        new Geometry.Point(0, 45),
+        {cls: "one"}
+    ),
+    new Feature(
+        new Geometry.Point(90, 45),
+        {cls: "two"}
+    ),
+    new Feature(
+        Geometry.fromWKT("LINESTRING(-110 -60, -80 -40, -50 -60, -20 -40)")
+    ),
+    new Feature(
+        Geometry.fromWKT("POLYGON((20 -20, 110 -20, 110 -80, 20 -80, 20 -20), (40 -40, 90 -40, 90 -60, 40 -60, 40 -40))")
+    )    
+];
+
+// create rule based styles
+var Rule = OpenLayers.Rule;
+var Filter = OpenLayers.Filter;
+var style = new OpenLayers.Style({
+    pointRadius: 10,
+    strokeWidth: 2,
+    strokeOpacity: 0.7,
+    strokeColor: "navy",
+    fillColor: "#ffcc66",
+    fillOpacity: 1
+}, {
+    rules: [
+        new Rule({
+            filter: new Filter.Comparison({
+                type: "==",
+                property: "cls",
+                value: "one"
+            }),
+            symbolizer: {
+                externalGraphic: "../img/marker-blue.png"
+            }
+        }),
+        new Rule({
+            filter: new Filter.Comparison({
+                type: "==",
+                property: "cls",
+                value: "two"
+            }),
+            symbolizer: {
+                externalGraphic: "../img/marker-green.png"
+            }
+        }),
+        new Rule({
+            elseFilter: true,
+            symbolizer: {
+                graphicName: "circle"
+            }
+        })
+    ]
+});
+
+var layer = new OpenLayers.Layer.Vector(null, {
+    styleMap: new OpenLayers.StyleMap({
+        "default": style,
+        select: {
+            fillColor: "red",
+            pointRadius: 13,
+            strokeColor: "yellow",
+            strokeWidth: 3
+        }
+    }),
+    isBaseLayer: true,
+    renderers: ["Canvas"]
+});
+layer.addFeatures(features);
+
+var map = new OpenLayers.Map({
+    div: "map",
+    layers: [layer],
+    center: new OpenLayers.LonLat(0, 0),
+    zoom: 0
+});
+
+var select = new OpenLayers.Control.SelectFeature(layer, {hover: true});
+map.addControl(select);
+select.activate();