private static double[][] polygon = {
            {100, 150, 1},
            {150, 150, 1},
            {150, 100, 1},
            {125, 80, 1},
            {100, 100, 1}
    };

private static int angle = 90;

private static double[][] transformationMatrix = {
            { Math.cos(a),  Math.sin(a), 0},
            { -Math.sin(a),  Math.cos(a), 0},
            {xR * (1 - Math.cos(a)) + yR * Math.sin(a), yR * (1 - Math.cos(a)) - xR * Math.sin(a), 1}
    };