made coordsize positive for vector renderers; seems to fixe some strange behavior in the vml renderer, and brings a performance gain by using this.size instead of calculating the size from extent and resolution every time. r=euzuro (closes #1157)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@7586 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Renderer/SVG.js

@@ -121,7 +121,7 @@ OpenLayers.Renderer.SVG = OpenLayers.Class(OpenLayers.Renderer.Elements, {
         // Set the viewbox -- the left/top will be pixels-dragged-since-res change,
         // the width/height will be pixels.
         var extentString = left + " " + top + " " + 
-                             extent.getWidth() / resolution + " " + extent.getHeight() / resolution;
+                             this.size.w + " " + this.size.h;
         //var extentString = extent.left / resolution + " " + -extent.top / resolution + " " + 
         this.rendererRoot.setAttributeNS(null, "viewBox", extentString);
     },
@@ -154,7 +154,13 @@ OpenLayers.Renderer.SVG = OpenLayers.Class(OpenLayers.Renderer.Elements, {
         var nodeType = null;
         switch (geometry.CLASS_NAME) {
             case "OpenLayers.Geometry.Point":
-                nodeType = style.externalGraphic ? "image" : "circle";
+                if (style.externalGraphic) {
+                    nodeType = "image";
+                } else if (style.graphicName) {
+                    nodeType = "use";
+                } else {
+                    nodeType = "circle";
+                }
                 break;
             case "OpenLayers.Geometry.Rectangle":
                 nodeType = "rect";