[LayaAir 2.0]graphics绘制报错

class Sprite_DisplayImage {

	constructor() {

		Laya.init(Laya.Browser.clientWidth, Laya.Browser.clientHeight, Laya.WebGL);

		const path = "./res/apes/monkey2.png";

		Laya.loader.load(path, Laya.Handler.create(this, function() {

			let tex = Laya.loader.getRes(path);

			let sp = new Laya.Sprite();

			Laya.stage.addChild(sp);

			sp.graphics.drawTriangles(

			    tex, 100, 0, 

    			new Float32Array([0,0,1,0,1,1,0,1]), 

    			new Float32Array([0,0,1,0,1,1,0,1]), 

    			new Uint16Array([0,1,2,2,3,0])

			);

			sp.graphics.drawImage(tex, 100, 0);

		}));

	}

}

new Sprite_DisplayImage();