Convenience library to do vector calculations : Vector « Game « Android

1. Android
2. Game
3. Vector

Convenience library to do vector calculations

 
//package com.nomnom.common;

import android.graphics.PointF;

/**
 * Convenience library to do vector calculations
 *  
 * @author garysoed
 */
public class Vector {
  
  private float x;
  private float y;
  
  public Vector(float x, float y) {
    this.x = x;
    this.y = y;
  }
  
  public float getX() {
    return x;
  }
  
  public float getY() {
    return y;
  }
  
  public void setXY(float x, float y) {
    this.x = x;
    this.y = y;
  }
  
  public float length() {
    return (float)Math.sqrt(lengthSquared()); 
  }
  
  public float lengthSquared() {
    return this.dot(this);
  }
  
  public float dot(Vector v2) {
    return x * v2.x + y * v2.y;
  }
  
  public Vector add(Vector v2) {
    setXY(x + v2.x, y + v2.y);
    return this;
  }
  
  public Vector substract(Vector v2) {
    setXY(x - v2.x, y - v2.y);
    return this;
  }
  
  public Vector multiply(float constant) {
    setXY(x * constant, y * constant);
    return this;
  }
  
  public Vector unitVector() {
    float length = length();
    return this.multiply(1 / length);
  }
  
  public Vector normal() {
    setXY(-y, x);
    return this;
  }
  
  public float bearing() {
    return (float) Math.atan2(y, x);
  }
  
  public static Vector copyOf(Vector vector) {
    return new Vector(vector.x, vector.y);
  }
  
  public static Vector fromPointF(PointF point) {
    return new Vector(point.x, point.y);
  }
}

   
  

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