/**
* Specifies the line end decoration, such as a triangle or arrowhead.
*/
public void setLineHeadDecoration(LineDecoration style){
CTLineProperties ln = getSpPr().getLn();
CTLineEndProperties lnEnd = ln.isSetHeadEnd() ? ln.getHeadEnd() : ln.addNewHeadEnd();
if(style == null){
if(lnEnd.isSetType()) lnEnd.unsetType();
} else {
lnEnd.setType(STLineEndType.Enum.forInt(style.ordinal() + 1));
}