创建圆角矩形：
1. 创建一个新的 Flash 文档，并将它保存为 roundrect.fla。
2. 将下面的 ActionScript 代码添加到时间轴中的第 1 帧：
this.createEmptyMovieClip("rectangle_mc", 10);
rectangle_mc._x = 100;
rectangle_mc._y = 100;
drawRoundedRectangle(rectangle_mc, 240, 180, 20, 0x99FF00, 100);
function drawRoundedRectangle(target_mc:MovieClip, boxWidth:Number,
boxHeight:Number, cornerRadius:Number, fillColor:Number,
fillAlpha:Number):Void {
with (target_mc) {
beginFill(fillColor, fillAlpha);
moveTo(cornerRadius, 0);
lineTo(boxWidth - cornerRadius, 0);
curveTo(boxWidth, 0, boxWidth, cornerRadius);
lineTo(boxWidth, cornerRadius);
lineTo(boxWidth, boxHeight - cornerRadius);
curveTo(boxWidth, boxHeight, boxWidth - cornerRadius, boxHeight);
lineTo(boxWidth - cornerRadius, boxHeight);
lineTo(cornerRadius, boxHeight);
curveTo(0, boxHeight, 0, boxHeight - cornerRadius);
lineTo(0, boxHeight - cornerRadius);
lineTo(0, cornerRadius);
curveTo(0, 0, cornerRadius, 0);
lineTo(cornerRadius, 0);
endFill();
}
}

注：圆角矩形其实就是直线和曲线的结合，只是写起来比较麻烦，复制到这里，用的时候来抄吧。