New vector rendering for better performance and less renderer specific limitations. r=elemoine (closes #1675, closes #1656, closes #1631, closes #1431, closes #1709)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@7930 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Renderer.js

@@ -103,13 +103,19 @@ OpenLayers.Renderer = OpenLayers.Class({
      * Resolution has probably changed, so we nullify the resolution 
      * cache (this.resolution) -- this way it will be re-computed when 
      * next it is needed.
+     * We nullify the resolution cache (this.resolution) if resolutionChanged
+     * is set to true - this way it will be re-computed on the next
+     * getResolution() request.
      *
      * Parameters:
-     * extent - {<OpenLayers.Bounds>} 
+     * extent - {<OpenLayers.Bounds>}
+     * resolutionChanged - {Boolean}
      */
-    setExtent: function(extent) {
+    setExtent: function(extent, resolutionChanged) {
         this.extent = extent.clone();
-        this.resolution = null;
+        if (resolutionChanged) {
+            this.resolution = null;
+        }
     },
     
     /**
@@ -148,14 +154,21 @@ OpenLayers.Renderer = OpenLayers.Class({
      *
      * Parameters:
      * feature - {<OpenLayers.Feature.Vector>} 
-     * style - {<Object>} 
+     * style - {<Object>}
+     * 
+     * Returns:
+     * {Boolean} true if the feature has been drawn completely, false if not,
+     *     undefined if the feature had no geometry
      */
     drawFeature: function(feature, style) {
         if(style == null) {
             style = feature.style;
         }
         if (feature.geometry) {
-            this.drawGeometry(feature.geometry, style, feature.id);
+            if (!feature.geometry.getBounds().intersectsBounds(this.extent)) {
+                style = {display: "none"};
+            }
+            return this.drawGeometry(feature.geometry, style, feature.id);
         }
     },
 
@@ -223,4 +236,4 @@ OpenLayers.Renderer = OpenLayers.Class({
     eraseGeometry: function(geometry) {},
 
     CLASS_NAME: "OpenLayers.Renderer"
-});
+});