User Guide

MovieClip.curveTo() 509

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

MovieClip.curveTo() and the Math class:

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);

}

An example is also in the drawingapi.fla file in the HelpExamples folder. The following list gives

typical paths to this folder:

• Windows: \Program Files\Macromedia\Flash MX 2004\Samples\HelpExamples\

• Macintosh: HD/Applications/Macromedia Flash MX 2004/Samples/HelpExamples/