Mega Code Archive
Convenience library to do vector calculations
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//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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