MACROMEDIA FLEX-FLEX ACTIONSCRIPT LANGUAGE Reference page 570

Example
The following example draws a circle with a solid blue hairline stroke and a solid red fill:
this.createEmptyMovieClip("circle_mc", 1);
with (circle_mc) {
lineStyle(0, 0x0000FF, 100);
beginFill(0xFF0000);
moveTo(500, 500);
curveTo(600, 500, 600, 400);
curveTo(600, 300, 500, 300);
curveTo(400, 300, 400, 400);
curveTo(400, 500, 500, 500);
endFill();
}
The curve drawn in this example is a quadratic bezier curve. Quadratic bezier curves consist of
two anchor points and a control point. The curve interpolates the two anchor points, and curves
toward the control point.
The following ActionScript creates a circle using
this.createEmptyMovieClip("circle2_mc", 2);
circle2_mc.lineStyle(0, 0x000000);
drawCircle(circle2_mc, 10, 10, 100);
function drawCircle(mc:MovieClip, x:Number, y:Number, r:Number):Void {
mc.moveTo(x+r, y);
mc.curveTo(r+x, Math.tan(Math.PI/8)*r+y, Math.sin(Math.PI/4)*r+x,
Math.sin(Math.PI/4)*r+y);
mc.curveTo(Math.tan(Math.PI/8)*r+x, r+y, x, r+y);
mc.curveTo(-Math.tan(Math.PI/8)*r+x, r+y, -Math.sin(Math.PI/4)*r+x,
Math.sin(Math.PI/4)*r+y);
mc.curveTo(-r+x, Math.tan(Math.PI/8)*r+y, -r+x, y);
mc.curveTo(-r+x, -Math.tan(Math.PI/8)*r+y, -Math.sin(Math.PI/4)*r+x, -
Math.sin(Math.PI/4)*r+y);
mc.curveTo(-Math.tan(Math.PI/8)*r+x, -r+y, x, -r+y);
mc.curveTo(Math.tan(Math.PI/8)*r+x, -r+y, Math.sin(Math.PI/4)*r+x, -
Math.sin(Math.PI/4)*r+y);
mc.curveTo(r+x, -Math.tan(Math.PI/8)*r+y, r+x, y);
}
See also
MovieClip.beginFill(), MovieClip.createEmptyMovieClip(), MovieClip.endFill(),
MovieClip.lineStyle(), MovieClip.lineTo(),
570 Chapter 7: ActionScript for Flash
MovieClip.curveTo()
MovieClip.moveTo()
and the Math class: