||A minimal implementation of ShapeDecoration, adds members and
accessors for graphic attributes :
length : the decoration length, along the path to decorate
width : the decoration width, normal to the path to decorate
orientation : the decoration is on the left or on the right of
stroke, paint : the stroke and paint to be used
||A ShapeDecoration that draws a circle on the path.
||A decoration which is just a line.
||Various computations about plane geometry.
||The ShapeDecorator class : in charge of drawing repeatedly several
stored decorations along a path (a polyline or a complex shape)
||The most simple decoration : space.
||A ShapeDecoration that draws a text along a path