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| -rw-r--r-- | doc/refman.tex | 10 |
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 |