Rotate elements in 2d array around pivot point (in my case i hardcoded pivot at {2:2} position}

gistfile1.cs

	static int cos90 = 0;
	static int sin90 = 1;
	void RotateAroundCenter(ref int x, ref int y){
		int xNew, yNew;
		x -= 2; //piwot point x = 2
		y -= 2; //piwot point y = 2;
		xNew = x * cos90  - y * sin90;
		yNew = x * sin90  + y * cos90;
		x = xNew + 2;
		y = yNew + 2;
	}