Add support for the extremely awesomely super-comprehensive rule based styling

that Andreas has been working so hard on. I think this is the single most awesome commit I've ever had the pleasure of committing. The results of this commit are described on http://trac.openlayers.org/wiki/Styles: essentially, this makes it possible to style features in all kinds of fun ways based on rules, and will also form the underlying basis for #533. Things this patch adds: * OL.Rule classes. These classes allow you to do tests against the propertie of a feature, and set a style based on these properties -- so you can compare the 'speedlimit' property of a line, and test if it is > 60, and if it is greater than 60, render it in a different color. You can also test combinations of rules using the OL.Rule.Logical class, and test featureids with the FeatureID class. * OL.Style class: The OL.Style class lets you wrap up Rules into styles that can be used with drawFeature to draw the feature in the selected style. * OL.Layer.Vector.drawFeature will check if the given style is an OL.Style object, and if so, it will draw the feature accordingly. examples/georss-flickr.html shows usage of these classes. Many, many thanks go to Andreas for all his hard work on this: this code really is very pretty, and includes unit tests for all the classes (and we know that I am a big fan of tests.) Three cheers for Andreas: Hip hip, hooray! hip hip, hooray! hip hip, hooray! git-svn-id: http://svn.openlayers.org/trunk/openlayers@5429 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
2007-12-15 16:17:50 +00:00
parent 43a4f9320b
commit fb3c02354f
15 changed files with 1851 additions and 0 deletions
@@ -0,0 +1,79 @@
+<html> 
+<head> 
+    <script src="../lib/OpenLayers.js"></script> 
+    <script type="text/javascript">
+
+    function test_Style_constructor(t) { 
+        t.plan(3); 
+         
+        var options = {'foo': 'bar'}; 
+        var style = new OpenLayers.Style(null, options); 
+        t.ok(style instanceof OpenLayers.Style, 
+             "new OpenLayers.Style returns object" ); 
+        t.eq(style.foo, "bar", "constructor sets options correctly"); 
+        t.eq(typeof style.createStyle, "function", "style has a createStyle function"); 
+    }
+    
+    function test_Style_create(t) {
+        t.plan(5);
+        
+        var map = new OpenLayers.Map("map");
+        
+        var layer = new OpenLayers.Layer.Vector("layer");
+         
+        var baseStyle = {externalGraphic: "bar${foo}.png"};
+        
+        var style = new OpenLayers.Style(baseStyle);
+        
+        var rule = new OpenLayers.Rule.FeatureId({
+                fids: ["1"],
+                symbolizer: {"Point": {fillColor: "green"}},
+                maxScale: 2000000});
+        style.addRules([rule]);
+        
+        var feature = new OpenLayers.Feature.Vector(
+                new OpenLayers.Geometry.Point(3,5),
+                {"foo": "bar"},
+                style);
+
+        feature.fid = "1";
+        // for this fid, the above rule should apply
+                
+        layer.addFeatures([feature]);
+        map.addLayer(layer);
+        map.setBaseLayer(layer);
+
+        map.setCenter(new OpenLayers.LonLat(3,5), 8);
+        // at this scale, the feature should be visible
+        var createdStyle = style.createStyle(feature);
+        t.eq(createdStyle.externalGraphic, "barbar.png", "Calculated property style correctly.");
+        t.eq(createdStyle.display, "", "Feature is visible at scale "+map.getScale());
+
+        map.setCenter(new OpenLayers.LonLat(3,5), 7);
+        // at this scale, the feature should be invisible
+        createdStyle = style.createStyle(feature);
+        t.eq(createdStyle.display, "none", "Feature is invisible at scale "+map.getScale());
+        t.eq(createdStyle.fillColor, "green", "Point symbolizer from rule for fid=\"1\" applied correctly.");
+        
+        feature.fid = "2";
+        // now the rule should not apply
+        
+        createdStyle = style.createStyle(feature);
+        t.eq(createdStyle.fillColor, undefined, "Correct style for rule that does not apply to fid=\"2\".");
+        
+    }
+
+    function test_Style_destroy(t) {
+        t.plan(1);
+        
+        var style = new OpenLayers.Style();
+        style.destroy();
+        t.eq(style.rules, null, "rules array nulled properly");
+    }
+
+    </script> 
+</head> 
+<body> 
+  <div id="map" style="width:500px;height:500px"></div>
+</body> 
+</html>