Laya鼠标点击移动旋转，滚轮缩放_laya 鼠标滚轮

function chromeInit(mod){
    var rotate = new Laya.Vector3(0,0,0);
    var lastPosition = new Laya.Vector2(0,0);
    var mousedown = false;

    Laya.stage.on(Laya.Event.MOUSE_DOWN,this, mouseDown);
    Laya.stage.on(Laya.Event.MOUSE_MOVE,this, mouseMove);
    Laya.stage.on(Laya.Event.MOUSE_UP,this, mouseUp)
	Laya.stage.on(Laya.Event.MOUSE_OUT,this, mouseUp);
	Laya.stage.on(Laya.Event.MOUSE_WHEEL,this,mouseWheel)

	function mouseDown(){
		lastPosition = new Laya.Vector2(Laya.stage.mouseX,Laya.stage.mouseY);
		mousedown = true;
	}

	function mouseMove(){
		if (mousedown) {
			//移动触碰点
			let deltaY = Laya.stage.mouseY - lastPosition.y;
			let deltaX = Laya.stage.mouseX - lastPosition.x;
			lastPosition.x = Laya.stage.mouseX;
			lastPosition.y = Laya.stage.mouseY;
			//根据移动的距离进行旋转
			rotate.setValue(0, 1 * deltaX / 2, 0);
			mod.transform.rotate(rotate,false,false);
		}
	}

	function mouseUp(){
		mousedown = false;
    }
	
	function mouseWheel(e){
		let currScale = mod.transform.scale;
		let newScale;
		if (e.delta > 0) {
			newScale = currScale.x + 0.1 > 2 ? 2 : (currScale.x + 0.1 < 0.2 ? 0.2 : (currScale.x + 0.1));
		} else {
			newScale = currScale.x - 0.1 > 2 ? 2 : (currScale.x - 0.1 < 0.2 ? 0.2 : (currScale.x - 0.1));
		}
		mod.transform.scale = new Laya.Vector3(newScale,newScale,newScale);
	}

    function offRotate(){
        Laya.stage.off(Laya.Event.MOUSE_DOWN,this, mouseDown);
        Laya.stage.off(Laya.Event.MOUSE_MOVE,this, mouseMove);
        Laya.stage.off(Laya.Event.MOUSE_UP,this, mouseUp)
        Laya.stage.off(Laya.Event.MOUSE_OUT,this, mouseUp);
    }
    return offRotate;
}

export {
    chromeInit
}
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