Math for Game Developers - Character Movement 3 (Vector Length)

Main class:

package learn.mathforgame.VectorLength;

public class Main {

public static void main(String[] args) {

Point p = new Point(0, -1);

Point i = new Point(1, 1);

Vector v = new Vector().subtractPoints(p, i);

System.out.println("Result: "+v.length(v));

}

}

Point class:

package learn.mathforgame.VectorLength;

public class Point {

private int x, y;

public Point(int x, int y) {

this.x = x;

this.y = y;

}

public int getX() {

return x;

}

public int getY() {

return y;

}

}

Vector class:

package learn.mathforgame.VectorLength;

public class Vector {

private int x, y;

public Vector() {

}

public Vector(int x, int y) {

this.x = x;

this.y = y;

}

public Vector subtractPoints(Point p, Point i) {

return new Vector(p.getX() - i.getX(), p.getY()-i.getY());

}

public float length(Vector v) {

return (float) Math.sqrt((v.x *v.x) + (v.y*v.y));

}

}