Java tutorial
//package com.java2s; //License from project: Open Source License public class Main { public static double getAngleByTwoPostion(float[] startPoints, float[] endPoint) { double result = 0; float xDistance = endPoint[0] - startPoints[0]; float yDistance = endPoint[1] - startPoints[1]; result = Math.atan2((double) yDistance, (double) xDistance) * 180 / Math.PI; result += 270; return result; } }