Update doxgen config and some comments.

simgear/canvas/Canvas.hxx

@@ -1,4 +1,4 @@
-// The canvas for rendering with the 2d API
+///@file The canvas for rendering with the 2d API
 //
 // Copyright (C) 2012  Thomas Geymayer <tomgey@gmail.com>
 //
@@ -34,6 +34,7 @@
 
 namespace simgear
 {
+/// Canvas 2D drawing API
 namespace canvas
 {
   class CanvasMgr;

simgear/canvas/CanvasEvent.hxx

@@ -38,8 +38,8 @@ namespace canvas
 #       define ENUM_MAPPING(name, str) name,
 #         include "CanvasEventTypes.hxx"
 #       undef ENUM_MAPPING
-        CUSTOM_EVENT ///<! all user defined event types share the same id. They
-                     ///   are just differentiated by using the type string.
+        CUSTOM_EVENT ///< all user defined event types share the same id. They
+                     ///  are just differentiated by using the type string.
       };
 
       int               type;

simgear/canvas/elements/CanvasElement.hxx

@@ -1,4 +1,4 @@
-// Interface for 2D Canvas elements
+///@file Interface for 2D Canvas elements
 //
 // Copyright (C) 2012  Thomas Geymayer <tomgey@gmail.com>
 //
@@ -41,6 +41,9 @@ namespace simgear
 namespace canvas
 {
 
+  /**
+   * Baseclass for Elements displayed inside a Canvas.
+   */
   class Element:
     public PropertyBasedElement
   {
@@ -69,10 +72,10 @@ namespace canvas
       };
       struct StyleInfo
       {
-        StyleSetter setter; ///!< Function(s) for setting this style
-        std::string type;   ///!< Interpolation type
-        bool inheritable;   ///!< Whether children can inherit this style from
-                            ///   their parents
+        StyleSetter setter; ///< Function(s) for setting this style
+        std::string type;   ///< Interpolation type
+        bool inheritable;   ///< Whether children can inherit this style from
+                            ///  their parents
       };
 
       /**
@@ -80,10 +83,10 @@ namespace canvas
        */
       enum ReferenceFrame
       {
-        GLOBAL, ///!< Global coordinates
-        PARENT, ///!< Coordinates relative to parent coordinate frame
-        LOCAL   ///!< Coordinates relative to local coordinates (parent
-                ///   coordinates with local transformations applied)
+        GLOBAL, ///< Global coordinates
+        PARENT, ///< Coordinates relative to parent coordinate frame
+        LOCAL   ///< Coordinates relative to local coordinates (parent
+                ///  coordinates with local transformations applied)
       };
 
       /**