<a href="dart-ui/Path-class.html">Path</a> objects are made up of zero or more contours. The first contour is
created once a drawing command (e.g. <a href="dart-ui/Path/lineTo.html">Path.lineTo</a>) is issued. A
<a href="dart-ui/Path/moveTo.html">Path.moveTo</a> command after a drawing command may create a new contour,
although it may not if optimizations are applied that determine the move
command did not actually result in moving the pen.</p>
<p>This property is only valid with reference to its original i