I need to rotate each vertex (x _i, y _i) by degrees counterclockwise, around the origin.

Hint:

xiyi=xicosyisin=yicos+xisin

xi=xicosyisinyi=yicos+xisin

My code is

public static void rotate(double[] x, double[] y, double theta) { for (int i = 0; i < x.length; i++) { x[i] = Math.cos(Math.toRadians(theta)) * x[i] - Math.sin(Math.toRadians(theta)) * y[i]; } for (int i = 0; i < y.length; i++) { y[i] = Math.cos(Math.toRadians(theta)) * y[i] + Math.sin(Math.toRadians(theta)) * x[i]; } }

But it doesn't seem to work, particularly on the y.