Js to do to achieve a pie chart with excanvas examples

graph_circle_1_0_2
..................\AUTHORS
..................\COPYING
..................\examples
..................\........\rendering-mode.js
..................\........\sample_graph_circle.css
..................\........\sample_graph_circle_1.html
..................\........\sample_graph_circle_1_quirks.html
..................\........\sample_graph_circle_2.html
..................\........\sample_graph_circle_2_quirks.html
..................\........\sample_graph_circle_3.html
..................\html5jp
..................\.......\excanvas
..................\.......\........\AUTHORS
..................\.......\........\COPYING
..................\.......\........\examples
..................\.......\........\........\example1.html
..................\.......\........\........\example2.html
..................\.......\........\........\example3.html

..................\.......\........\excanvas.js
..................\.......\........\README
..................\.......\........\testcases
..................\.......\........\.........\arc.html
..................\.......\........\.........\clearpath.html
..................\.......\........\.........\drawimage.html
..................\.......\........\.........\gradient.html
..................\.......\........\.........\gradient2.html
..................\.......\........\.........\linewidth.html
..................\.......\........\.........\overflow.html
..................\.......\........\.........\quadraticcurve.html
..................\.......\........\.........\resizing.html
..................\.......\........\.........\saverestorepath.html
..................\.......\........\.........\stroke-scale-rotate.html
..................\.......\........\.........\stroke-should-not-close-path.html
..................\.......\graph
..................\.......\.....\circle.js

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