ccontext:NewSubPath()
In many cases, this call is not needed since new sub-paths are frequently started with ccontext:MoveTo().
A call to ccontext:NewSubPath() is particularly useful when
beginning a new sub-path with one of the ccontext:Arc() calls. This
makes things easier as it is no longer necessary to manually
compute the arc's initial coordinates for a call to
ccontext:MoveTo().