add typedef struct rtgui_line;

include/rtgui/rtgui.h

@@ -67,6 +67,15 @@ struct rtgui_point
 typedef struct rtgui_point rtgui_point_t;
 extern rtgui_point_t rtgui_empty_point;
 
+/**
+* line segment
+*/
+struct rtgui_line
+{
+    rtgui_point_t start, end;
+};
+typedef struct rtgui_line rtgui_line_t;
+
 /**
  * Rectangle structure
  */