angle Between Oriented - Java 2D Graphics

Java examples for 2D Graphics:Angle

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Description

angle Between Oriented

Demo Code


import javax.vecmath.Tuple2d;

public class Main{
    private static final double PI_2 = Math.PI * 2;
    public static double angleBetweenOriented(Tuple2d tip1, Tuple2d tail,
            Tuple2d tip2) {//  ww  w .ja v  a 2 s.co m
        double a1 = angle(tail, tip1);
        double a2 = angle(tail, tip2);
        double angDel = a2 - a1;

        if (angDel <= -Math.PI) {
            return angDel + PI_2;
        }
        if (angDel > Math.PI) {
            return angDel - PI_2;
        }
        return angDel;
    }
    public static double angle(Tuple2d p0, Tuple2d p1) {
        double dx = p1.x - p0.x;
        double dy = p1.y - p0.y;
        return Math.atan2(dy, dx);
    }
    public static double angle(Tuple2d p) {
        return Math.atan2(p.y, p.x);
    }
}

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