function ShapePath(){
	this.c = false;
	this._length = 0;
	this._maxLength = 8;
	this.v = createSizedArray(this._maxLength);
	this.o = createSizedArray(this._maxLength);
	this.i = createSizedArray(this._maxLength);
}

ShapePath.prototype.setPathData = function(closed, len) {
	this.c = closed;
	this.setLength(len);
	var i = 0;
	while(i < len){
		this.v[i] = point_pool.newElement();
		this.o[i] = point_pool.newElement();
		this.i[i] = point_pool.newElement();
		i += 1;
	}
};

ShapePath.prototype.setLength = function(len) {
	while(this._maxLength < len) {
		this.doubleArrayLength();
	}
	this._length = len;
};

ShapePath.prototype.doubleArrayLength = function() {
	this.v = this.v.concat(createSizedArray(this._maxLength));
	this.i = this.i.concat(createSizedArray(this._maxLength));
	this.o = this.o.concat(createSizedArray(this._maxLength));
	this._maxLength *= 2;
};

ShapePath.prototype.setXYAt = function(x, y, type, pos, replace) {
	var arr;
	this._length = Math.max(this._length, pos + 1);
	if(this._length >= this._maxLength) {
		this.doubleArrayLength();
	}
	switch(type){
		case 'v':
			arr = this.v;
			break;
		case 'i':
			arr = this.i;
			break;
		case 'o':
			arr = this.o;
			break;
	}
	if(!arr[pos] || (arr[pos] && !replace)){
		arr[pos] = point_pool.newElement();
	}
	arr[pos][0] = x;
	arr[pos][1] = y;
};

ShapePath.prototype.setTripleAt = function(vX,vY,oX,oY,iX,iY,pos, replace) {
	this.setXYAt(vX,vY,'v',pos, replace);
	this.setXYAt(oX,oY,'o',pos, replace);
	this.setXYAt(iX,iY,'i',pos, replace);
};

ShapePath.prototype.reverse = function() {
	var newPath = new ShapePath();
	newPath.setPathData(this.c, this._length);
	var vertices = this.v, outPoints = this.o, inPoints = this.i;
	var init = 0;
	if (this.c) {
		newPath.setTripleAt(vertices[0][0], vertices[0][1], inPoints[0][0], inPoints[0][1], outPoints[0][0], outPoints[0][1], 0, false);
        init = 1;
    }
    var cnt = this._length - 1;
    var len = this._length;

    for (i = init; i < len; i += 1) {
    	newPath.setTripleAt(vertices[cnt][0], vertices[cnt][1], inPoints[cnt][0], inPoints[cnt][1], outPoints[cnt][0], outPoints[cnt][1], i, false);
        cnt -= 1;
    }
    return newPath;
};