Circular Flash animation effect with AS

Flash animation First look at the specific picture Circle Flash animation effect

See a lot of people talking about circular animation, some people say by frame, more tired; some people say that the polygon is rounded, this method is slow to run, and definitely not a real circle. Curve statement is actually good, very simple to achieve a circular animation.

m=0;
Previous radians
n=0;
The last Radian
r=50;
Circle radius
LineStyle (1);
Line Style
MoveTo (0,R);
Starting point
_root.onenterframe=function () {
Load Frame function
if (N<=2*math.pi) {
Finish Drawing Circle Stop
n+=math.pi/180;
Minimum unit
Curveto (R*math.sin (M), R*math.cos (M), R*math.sin (n), R*math.cos (n));
Curve Drawing Circle
M=n;}
Assign the latter radian to the previous one to copy the above textbooks to the frame, and a circle-drawing animation appears.