 transformation matrix is the identity transform.
It can be modified using the <a href="dart-ui/Canvas/translate.html">translate</a>, <a href="dart-ui/Canvas/scale.html">scale</a>, <a href="dart-ui/Canvas/rotate.html">rotate</a>, <a href="dart-ui/Canvas/skew.html">skew</a>,
and <a href="dart-ui/Canvas/transform.html">transform</a> methods.</p>
<p>A canvas also has a current clip region which is applied to all operations.
Initially, the clip region is infinite. It can be modified using the
<a href="dart-ui/C