Flash中使用ActionScript检测圆形和矩形是否碰撞（倾斜矩形）

/**
* 将一个点,按照指定的坐标信息(原点,旋转),转换为另外一个点
* @param p 原始点
* @param base 新的坐标原点
* @param angle 新左边系X轴的旋转角度
* @return 新点的数据
*
*/
public static function convertLocalPoint(p:Point, base:Point, angle:Number):Point
{
var matrix :Matrix = new Matrix();
//matrix.createBox(1, 1, -angle*Math.PI/180, -base.x, -base.y);
matrix.translate(-base.x, -base.y);
matrix.rotate(-angle*Math.PI/180);
var p2 :Point = matrix.transformPoint(p);
return p2;
}

/**
* 判定一个圆形，是否和矩形相交（矩形的边和XY坐标轴对齐）
* @param center
* @param radius
* @param min
* @param max
* @return
*
*/
public static function intersectCircleAABB(center:Point, radius:Number, min:Point, max:Point) : Point
{
var closestPoint:Point = center.clone();
if( center.x < min.x )
closestPoint.x = min.x;
else if( center.x > max.x )
closestPoint.x = max.x;
if( center.y < min.y )
closestPoint.y = min.y;
else if( center.y > max.y )
closestPoint.y = max.y;
var diff:Point = closestPoint.subtract( center );
if( diff.x * diff.x + diff.y * diff.y > radius * radius )
return null;
return closestPoint;
}

/**
* 判定一个圆和一个矩形是否碰撞
* @param center
* @param radius
* @param loc
* @param angle
* @param width
* @param height
* @return true/碰撞 false/不碰撞
*
*/
public static function checkRectCircleCollide(center:Point, radius:Number, loc:Point, angle:Number, width:Number, height:Number):Boolean
{
var min        :Point = new Point(0, -height/2);
var max        :Point = new Point(width, height/2);
trace('center:', center, 'radius:', radius, 'loc:', loc, 'angle:', angle, 'width:', width, 'height:', height);
var center2    :Point    = convertLocalPoint(center, loc, angle);
var result    :Point = intersectCircleAABB(center2, radius, min, max);
trace('center2:', center2, 'min:', min, 'max:', max);
return result!=null;
}

[Test]
public function testMatrix():void
{
var base :Point = new Point(0,0);
var angle :Number = 7.454;
var p    :Point = new Point(137, 14);
var p1  :Point = Vector2Extension.convertLocalPoint(p, base, angle);
trace("p", p, "p1", p1);

base = new Point(2266,2049);
angle = 7.454;
p    = new Point(2403, 2063);
p1  = Vector2Extension.convertLocalPoint(p, base, angle);
trace("p", p, "p1", p1);

var p2 :Point = Vector2Extension.intersectCircleAABB(new Point(500,500), 142, new Point(10,10), new Point(900,900));
trace(p2);

}