meilleure description des segments beziers dans un item curve

1 files changed, 8 insertions, 2 deletions

diff --git a/doc/refman.tex b/doc/refman.tex
index aa321a9..9aa43be 100644
--- a/doc/refman.tex
+++ b/doc/refman.tex
@@ -3506,8 +3506,14 @@ attribute has priority over the \attributeref{arc}{fillcolor} attribute and the
 \object{curve}
 
 
-  Items of type \ident{curve} display a path of line segments and/or cubic bezier connected
-  by their end points. The polygon delimited by the path can optionally be filled.
+  Items of type \ident{curve} display pathes of line segments and/or cubic bezier connected
+  by their end points. A cubic Bezier is defined by four points. The first and last
+  ones are the extremities of the cubic Bezier. The second and the third ones are control point
+  (i.e. they must have a third ``coordinate'' with the value 'c'). If both control points
+  are identical, one may be omitted. As a consequence, it is an error to have more than
+  two succcessive control points or to start or finish a curve with a control point. 
+
+  The polygon delimited by the path can optionally be filled.
   It is possible to build curve items with more than one path to
   describe complex shapes with the \cmdref{contour} command. This command can be used to
   perform boolean operations between a curve and almost any other item available in TkZinc