//CLASS: 显示图像类。
function SingleWall(points, image) {
	Geometry.apply(this, arguments);
	this.points = points;
	if(typeof image == Image) {
		this.useUrl = false;
		this.image = image;
	}else {
		this.useUrl = true;
		this.image = image;
	}
	
	this.disappearPointIndex=-1;
	this.isRing=true;
	this.state=0;
};


SingleWall.prototype = new Geometry();

SingleWall.prototype.geoType = "SingleWall";