package org.bukkit.util;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Random;
import org.bukkit.configuration.serialization.ConfigurationSerializable;
import org.bukkit.configuration.serialization.SerializableAs;
/**
* Represents a mutable vector. Because the components of Vectors are mutable,
* storing Vectors long term may be dangerous if passing code modifies the
* Vector later. If you want to keep around a Vector, it may be wise to call
* <code>clone()</code> in order to get a copy.
*/
@SerializableAs("Vector")
public class Vector implements Cloneable, ConfigurationSerializable {
private static Random random = new Random();
/**
* Threshold for fuzzy equals().
*/
private static final double epsilon = 0.000001;
protected double x;
protected double y;
protected double z;
/**
* Construct the vector with all components as 0.
*/
public Vector() {
x = 0;
y = 0;
z = 0;
}
/**
* Construct the vector with provided integer components.
*
* @param x
* X component
* @param y
* Y component
* @param z
* Z component
*/
public Vector(int x, int y, int z) {
this.x = x;
this.y = y;
this.z = z;
}
/**
* Construct the vector with provided double components.
*
* @param x
* X component
* @param y
* Y component
* @param z
* Z component
*/
public Vector(double x, double y, double z) {
this.x = x;
this.y = y;
this.z = z;
}
/**
* Construct the vector with provided float components.
*
* @param x
* X component
* @param y
* Y component
* @param z
* Z component
*/
public Vector(float x, float y, float z) {
this.x = x;
this.y = y;
this.z = z;
}
/**
* Adds a vector to this one
*
* @param vec
* The other vector
* @return the same vector
*/
public Vector add(Vector vec) {
x += vec.x;
y += vec.y;
z += vec.z;
return this;
}
/**
* Subtracts a vector from this one.
*
* @param vec
* The other vector
* @return the same vector
*/
public Vector subtract(Vector vec) {
x -= vec.x;
y -= vec.y;
z -= vec.z;
return this;
}
/**
* Multiplies the vector by another.
*
* @param vec
* The other vector
* @return the same vector
*/
public Vector multiply(Vector vec) {
x *= vec.x;
y *= vec.y;
z *= vec.z;
return this;
}
/**
* Divides the vector by another.
*
* @param vec
* The other vector
* @return the same vector
*/
public Vector divide(Vector vec) {
x /= vec.x;
y /= vec.y;
z /= vec.z;
return this;
}
/**
* Copies another vector
*
* @param vec
* The other vector
* @return the same vector
*/
public Vector copy(Vector vec) {
x = vec.x;
y = vec.y;
z = vec.z;
return this;
}
/**
* Gets the magnitude of the vector, defined as sqrt(x^2+y^2+z^2). The value
* of this method is not cached and uses a costly square-root function, so
* do not repeatedly call this method to get the vector's magnitude. NaN
* will be returned if the inner result of the sqrt() function overflows,
* which will be caused if the length is too long.
*
* @return the magnitude
*/
public double length() {
return Math.sqrt(Math.pow(x, 2) + Math.pow(y, 2) + Math.pow(z, 2));
}
/**
* Gets the magnitude of the vector squared.
*
* @return the magnitude
*/
public double lengthSquared() {
return Math.pow(x, 2) + Math.pow(y, 2) + Math.pow(z, 2);
}
/**
* Get the distance between this vector and another. The value of this
* method is not cached and uses a costly square-root function, so do not
* repeatedly call this method to get the vector's magnitude. NaN will be
* returned if the inner result of the sqrt() function overflows, which will
* be caused if the distance is too long.
*
* @param o
* The other vector
* @return the distance
*/
public double distance(Vector o) {
return Math.sqrt(Math.pow(x - o.x, 2) + Math.pow(y - o.y, 2) + Math.pow(z - o.z, 2));
}
/**
* Get the squared distance between this vector and another.
*
* @param o
* The other vector
* @return the distance
*/
public double distanceSquared(Vector o) {
return Math.pow(x - o.x, 2) + Math.pow(y - o.y, 2) + Math.pow(z - o.z, 2);
}
/**
* Gets the angle between this vector and another in radians.
*
* @param other
* The other vector
* @return angle in radians
*/
public float angle(Vector other) {
double dot = dot(other) / (length() * other.length());
return (float) Math.acos(dot);
}
/**
* Sets this vector to the midpoint between this vector and another.
*
* @param other
* The other vector
* @return this same vector (now a midpoint)
*/
public Vector midpoint(Vector other) {
x = (x + other.x) / 2;
y = (y + other.y) / 2;
z = (z + other.z) / 2;
return this;
}
/**
* Gets a new midpoint vector between this vector and another.
*
* @param other
* The other vector
* @return a new midpoint vector
*/
public Vector getMidpoint(Vector other) {
double x = (this.x + other.x) / 2;
double y = (this.y + other.y) / 2;
double z = (this.z + other.z) / 2;
return new Vector(x, y, z);
}
/**
* Performs scalar multiplication, multiplying all components with a scalar.
*
* @param m
* The factor
* @return the same vector
*/
public Vector multiply(int m) {
x *= m;
y *= m;
z *= m;
return this;
}
/**
* Performs scalar multiplication, multiplying all components with a scalar.
*
* @param m
* The factor
* @return the same vector
*/
public Vector multiply(double m) {
x *= m;
y *= m;
z *= m;
return this;
}
/**
* Performs scalar multiplication, multiplying all components with a scalar.
*
* @param m
* The factor
* @return the same vector
*/
public Vector multiply(float m) {
x *= m;
y *= m;
z *= m;
return this;
}
/**
* Calculates the dot product of this vector with another. The dot product
* is defined as x1*x2+y1*y2+z1*z2. The returned value is a scalar.
*
* @param other
* The other vector
* @return dot product
*/
public double dot(Vector other) {
return x * other.x + y * other.y + z * other.z;
}
/**
* Calculates the cross product of this vector with another. The cross
* product is defined as:
* <p />
* x = y1 * z2 - y2 * z1<br/>
* y = z1 * x2 - z2 * x1<br/>
* z = x1 * y2 - x2 * y1
*
* @param o
* The other vector
* @return the same vector
*/
public Vector crossProduct(Vector o) {
double newX = y * o.z - o.y * z;
double newY = z * o.x - o.z * x;
double newZ = x * o.y - o.x * y;
x = newX;
y = newY;
z = newZ;
return this;
}
/**
* Converts this vector to a unit vector (a vector with length of 1).
*
* @return the same vector
*/
public Vector normalize() {
double length = length();
x /= length;
y /= length;
z /= length;
return this;
}
/**
* Zero this vector's components.
*
* @return the same vector
*/
public Vector zero() {
x = 0;
y = 0;
z = 0;
return this;
}
/**
* Returns whether this vector is in an axis-aligned bounding box. The
* minimum and maximum vectors given must be truly the minimum and maximum
* X, Y and Z components.
*
* @param min
* Minimum vector
* @param max
* Maximum vector
* @return whether this vector is in the AABB
*/
public boolean isInAABB(Vector min, Vector max) {
return x >= min.x && x <= max.x && y >= min.y && y <= max.y && z >= min.z && z <= max.z;
}
/**
* Returns whether this vector is within a sphere.
*
* @param origin
* Sphere origin.
* @param radius
* Sphere radius
* @return whether this vector is in the sphere
*/
public boolean isInSphere(Vector origin, double radius) {
return Math.pow(origin.x - x, 2) + Math.pow(origin.y - y, 2) + Math.pow(origin.z - z, 2) <= Math.pow(radius, 2);
}
/**
* Gets the X component.
*
* @return The X component.
*/
public double getX() {
return x;
}
/**
* Gets the floored value of the X component, indicating the block that this
* vector is contained with.
*
* @return block X
*/
public int getBlockX() {
return NumberConversions.floor(x);
}
/**
* Gets the Y component.
*
* @return The Y component.
*/
public double getY() {
return y;
}
/**
* Gets the floored value of the Y component, indicating the block that this
* vector is contained with.
*
* @return block y
*/
public int getBlockY() {
return NumberConversions.floor(y);
}
/**
* Gets the Z component.
*
* @return The Z component.
*/
public double getZ() {
return z;
}
/**
* Gets the floored value of the Z component, indicating the block that this
* vector is contained with.
*
* @return block z
*/
public int getBlockZ() {
return NumberConversions.floor(z);
}
/**
* Set the X component.
*
* @param x
* The new X component.
* @return This vector.
*/
public Vector setX(int x) {
this.x = x;
return this;
}
/**
* Set the X component.
*
* @param x
* The new X component.
* @return This vector.
*/
public Vector setX(double x) {
this.x = x;
return this;
}
/**
* Set the X component.
*
* @param x
* The new X component.
* @return This vector.
*/
public Vector setX(float x) {
this.x = x;
return this;
}
/**
* Set the Y component.
*
* @param y
* The new Y component.
* @return This vector.
*/
public Vector setY(int y) {
this.y = y;
return this;
}
/**
* Set the Y component.
*
* @param y
* The new Y component.
* @return This vector.
*/
public Vector setY(double y) {
this.y = y;
return this;
}
/**
* Set the Y component.
*
* @param y
* The new Y component.
* @return This vector.
*/
public Vector setY(float y) {
this.y = y;
return this;
}
/**
* Set the Z component.
*
* @param z
* The new Z component.
* @return This vector.
*/
public Vector setZ(int z) {
this.z = z;
return this;
}
/**
* Set the Z component.
*
* @param z
* The new Z component.
* @return This vector.
*/
public Vector setZ(double z) {
this.z = z;
return this;
}
/**
* Set the Z component.
*
* @param z
* The new Z component.
* @return This vector.
*/
public Vector setZ(float z) {
this.z = z;
return this;
}
/**
* Checks to see if two objects are equal.
* <p />
* Only two Vectors can ever return true. This method uses a fuzzy match to
* account for floating point errors. The epsilon can be retrieved with
* epsilon.
*/
@Override
public boolean equals(Object obj) {
if (!(obj instanceof Vector)) {
return false;
}
Vector other = (Vector) obj;
return Math.abs(x - other.x) < epsilon && Math.abs(y - other.y) < epsilon && Math.abs(z - other.z) < epsilon && this.getClass().equals(obj.getClass());
}
/**
* Returns a hash code for this vector
*
* @return hash code
*/
@Override
public int hashCode() {
int hash = 7;
hash = 79 * hash + (int) (Double.doubleToLongBits(x) ^ Double.doubleToLongBits(x) >>> 32);
hash = 79 * hash + (int) (Double.doubleToLongBits(y) ^ Double.doubleToLongBits(y) >>> 32);
hash = 79 * hash + (int) (Double.doubleToLongBits(z) ^ Double.doubleToLongBits(z) >>> 32);
return hash;
}
/**
* Get a new vector.
*
* @return vector
*/
@Override
public Vector clone() {
try {
return (Vector) super.clone();
} catch (CloneNotSupportedException e) {
throw new Error(e);
}
}
/**
* Returns this vector's components as x,y,z.
*/
@Override
public String toString() {
return x + "," + y + "," + z;
}
/**
* Get the block vector of this vector.
*
* @return A block vector.
*/
public BlockVector toBlockVector() {
return new BlockVector(x, y, z);
}
/**
* Get the threshold used for equals().
*
* @return The epsilon.
*/
public static double getEpsilon() {
return epsilon;
}
/**
* Gets the minimum components of two vectors.
*
* @param v1
* The first vector.
* @param v2
* The second vector.
* @return minimum
*/
public static Vector getMinimum(Vector v1, Vector v2) {
return new Vector(Math.min(v1.x, v2.x), Math.min(v1.y, v2.y), Math.min(v1.z, v2.z));
}
/**
* Gets the maximum components of two vectors.
*
* @param v1
* The first vector.
* @param v2
* The second vector.
* @return maximum
*/
public static Vector getMaximum(Vector v1, Vector v2) {
return new Vector(Math.max(v1.x, v2.x), Math.max(v1.y, v2.y), Math.max(v1.z, v2.z));
}
/**
* Gets a random vector with components having a random value between 0 and
* 1.
*
* @return A random vector.
*/
public static Vector getRandom() {
return new Vector(random.nextDouble(), random.nextDouble(), random.nextDouble());
}
@Override
public Map<String, Object> serialize() {
Map<String, Object> result = new LinkedHashMap<String, Object>();
result.put("x", getX());
result.put("y", getY());
result.put("z", getZ());
return result;
}
public static Vector deserialize(Map<String, Object> args) {
double x = 0;
double y = 0;
double z = 0;
if (args.containsKey("x")) {
x = (Double) args.get("x");
}
if (args.containsKey("y")) {
y = (Double) args.get("y");
}
if (args.containsKey("z")) {
z = (Double) args.get("z");
}
return new Vector(x, y, z);
}
}