Added missing api doc for render method

git-svn-id: http://svn.osgeo.org/qgis/trunk@11857 c8812cc2-4d05-0410-92ff-de0c093fc19c

Author: timlinux

src/core/qgsmaplayer.h

@@ -79,6 +79,12 @@ class CORE_EXPORT QgsMapLayer : public QObject
      */
     QString const & name() const;
 
+    /** This is the method that does the actual work of 
+     * drawing the layer onto a paint device.
+     * @param QgsRenderContext - describes the extents, 
+     * resolution etc. that should be used when rendering the 
+     * layer.
+     */
     virtual bool draw( QgsRenderContext& rendererContext );
 
     /** Draw labels