func NewLineStroker(c LineCap, j LineJoin, flattener Flattener) *LineStroker {
	l := new(LineStroker)
	l.Flattener = flattener
	l.HalfLineWidth = 0.5
	l.Cap = c
	l.Join = j
	return l
}
NewLineStroker creates a new line stroker.
package drawing