oval_circle_draw.as

这是《Flash MX编程与创意实现》的源代码

/*
  Oval and Circle Drawing v1.0
  Oct. 29, 2002
  adapted from Casper Schuirink's drawCircle()
  
  MovieClip methods to draw ovals (ellipses) and circles.
  
  Discussed in Chapter 10 of 
  Robert Penner's Programming Macromedia Flash MX
  
  http://www.robertpenner.com/profmx
  http://www.amazon.com/exec/obidos/ASIN/0072223561/robertpennerc-20
*/


MovieClip.prototype.drawOval = function (x, y, rx, ry) {
    this.moveTo (x+rx, y);
    this.curveTo (rx+x, 0.4142*ry+y, 0.7071*rx+x, 0.7071*ry+y);
    this.curveTo (0.4142*rx+x, ry+y, x, ry+y);
    this.curveTo (-0.4142*rx+x, ry+y, -0.7071*rx+x, 0.7071*ry+y);
    this.curveTo (-rx+x, 0.4142*ry+y, -rx+x, y);
    this.curveTo (-rx+x, -0.4142*ry+y, -0.7071*rx+x, -0.7071*ry+y);
    this.curveTo (-0.4142*rx+x, -ry+y, x, -ry+y);
    this.curveTo (0.4142*rx+x, -ry+y, 0.7071*rx+x, -0.7071*ry+y);
    this.curveTo (rx+x, -0.4142*ry+y, rx+x, y);
}; // adapted from Casper Schuirink's drawCircle()


MovieClip.prototype.drawCircle = function (x, y, r) {
	this.drawOval (x, y, r, r);
};