Vector2d

java.lang.Object
- tools.Vector2d

```
public class Vector2d
extends java.lang.Object
```
This class represents a vector, or a position, in the map. PTSP-Competition Created by Diego Perez, University of Essex. Date: 19/12/11

Field Summary

Fields
Modifier and Type Field and Description

double x
X-coordinate of the vector.

double y
Y-coordinate of the vector.

Fields
Modifier and Type	Field and Description
`double`	`x` X-coordinate of the vector.
`double`	`y` Y-coordinate of the vector.

Constructor Summary

Constructors
Constructor and Description
`Vector2d()` Default constructor.
`Vector2d(double x, double y)` Builds a vector from its coordinates.
`Vector2d(Vector2d v)` Builds a vector from another vector.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`Vector2d`	`add(double x, double y)` Adds to this vector two coordinates
`Vector2d`	`add(Vector2d v)` Adds another vector to this.
`Vector2d`	`add(Vector2d v, double w)` Adds to this vector another vector, scaled it by a factor..
`Vector2d`	`copy()` Creates a copy of this vector
`double`	`dist(double xx, double yy)` Returns the distance from this vector to a pair of coordinates.
`double`	`dist(Vector2d v)` Returns the distance from this vector to the one in the arguments.
`double`	`dot(Vector2d v)` Calculates the dot product between this vector and the one passed by parameter.
`boolean`	`equals(java.lang.Object o)` Checks if a vector and this are the same.
`double`	`mag()` Gets the magnitude of the vector.
`Vector2d`	`mul(double fac)` Multiplies this vector by a factor.
`void`	`normalise()` Normalises this vector.
`void`	`rotate(double theta)` Rotates the vector an angle given, in radians.
`double`	`scalarProduct(Vector2d v)` Calculates the scalar product of this vector and the one passed by parameter
`void`	`set(double x, double y)` Sets this vector's coordinates to the coordinates given.
`void`	`set(Vector2d v)` Sets this vector's coordinates to the coordinates of another vector.
`double`	`sqDist(Vector2d v)` Returns the square distance from this vector to the one in the arguments.
`static double`	`sqr(double x)` Gets the square value of the parameter passed.
`Vector2d`	`subtract(double x, double y)` Subtracts two coordinates to this vector.
`Vector2d`	`subtract(Vector2d v)` Subtracts another vector from this.
`double`	`theta()` Returns the atan2 of this vector.
`java.lang.String`	`toString()` Returns a representative String of this vector.
`Vector2d`	`unitVector()`
`Vector2d`	`wrap(double w, double h)` Performs a wrap operation over this vector.
`void`	`zero()` Sets the vector's coordinates to (0,0)

Methods inherited from class java.lang.Object
clone, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Field Detail
  - x
```
public double x
```
    X-coordinate of the vector.
  - y
```
public double y
```
    Y-coordinate of the vector.
- Constructor Detail
  - Vector2d
```
public Vector2d()
```
    Default constructor.
  - Vector2d
```
public Vector2d(double x,
                double y)
```
    Builds a vector from its coordinates.
    
    Parameters:
    
    x - x coordinate
    
    y - y coordinate
  - Vector2d
```
public Vector2d(Vector2d v)
```
    Builds a vector from another vector.
    
    Parameters:
    
    v - Vector to copy from.
- Method Detail
  - equals
```
public boolean equals(java.lang.Object o)
```
    Checks if a vector and this are the same.
    
    Overrides:
    
    equals in class java.lang.Object
    
    Parameters:
    
    o - the other vector to check
    
    Returns:
    
    true if their coordinates are the same.
  - copy
```
public Vector2d copy()
```
    Creates a copy of this vector
    
    Returns:
    
    a copy of this vector
  - set
```
public void set(Vector2d v)
```
    Sets this vector's coordinates to the coordinates of another vector.
    
    Parameters:
    
    v - that other vector.
  - set
```
public void set(double x,
                double y)
```
    Sets this vector's coordinates to the coordinates given.
    
    Parameters:
    
    x - x coordinate.
    
    y - y coordinate.
  - zero
```
public void zero()
```
    Sets the vector's coordinates to (0,0)
  - toString
```
public java.lang.String toString()
```
    Returns a representative String of this vector.
    
    Overrides:
    
    toString in class java.lang.Object
    
    Returns:
    
    a representative String of this vector.
  - add
```
public Vector2d add(Vector2d v)
```
    Adds another vector to this.
    
    Parameters:
    
    v - vector to add.
    
    Returns:
    
    this, after the addition.
  - add
```
public Vector2d add(double x,
                    double y)
```
    Adds to this vector two coordinates
    
    Parameters:
    
    x - x coordinate
    
    y - y coordinate
    
    Returns:
    
    returns this, after the addition.
  - add
```
public Vector2d add(Vector2d v,
                    double w)
```
    Adds to this vector another vector, scaled it by a factor..
    
    Parameters:
    
    v - Vector to add, to be scaled by w
    
    w - Scale of v.
    
    Returns:
    
    this vector, after the addition.
  - wrap
```
public Vector2d wrap(double w,
                     double h)
```
    Performs a wrap operation over this vector.
    
    Parameters:
    
    w - width
    
    h - height
    
    Returns:
    
    This vector, after the wrap.
  - subtract
```
public Vector2d subtract(Vector2d v)
```
    Subtracts another vector from this.
    
    Parameters:
    
    v - vector to subtract.
    
    Returns:
    
    this, after the subtraction.
  - subtract
```
public Vector2d subtract(double x,
                         double y)
```
    Subtracts two coordinates to this vector.
    
    Parameters:
    
    x - x coordinate
    
    y - y coordinate
    
    Returns:
    
    returns this, after the subtraction.
  - mul
```
public Vector2d mul(double fac)
```
    Multiplies this vector by a factor.
    
    Parameters:
    
    fac - factor to multiply this vector by.
    
    Returns:
    
    This vector, after the operation.
  - rotate
```
public void rotate(double theta)
```
    Rotates the vector an angle given, in radians.
    
    Parameters:
    
    theta - angle given, in radians
  - scalarProduct
```
public double scalarProduct(Vector2d v)
```
    Calculates the scalar product of this vector and the one passed by parameter
    
    Parameters:
    
    v - vector to do the scalar product with.
    
    Returns:
    
    the value of the scalar product.
  - sqr
```
public static double sqr(double x)
```
    Gets the square value of the parameter passed.
    
    Parameters:
    
    x - parameter
    
    Returns:
    
    x * x
  - sqDist
```
public double sqDist(Vector2d v)
```
    Returns the square distance from this vector to the one in the arguments.
    
    Parameters:
    
    v - the other vector, to calculate the distance to.
    
    Returns:
    
    the square distance, in pixels, between this vector and v.
  - mag
```
public double mag()
```
    Gets the magnitude of the vector.
    
    Returns:
    
    the magnitude of the vector (Math.sqrt(sqr(x) + sqr(y)))
  - dist
```
public double dist(Vector2d v)
```
    Returns the distance from this vector to the one in the arguments.
    
    Parameters:
    
    v - the other vector, to calculate the distance to.
    
    Returns:
    
    the distance, in pixels, between this vector and v.
  - dist
```
public double dist(double xx,
                   double yy)
```
    Returns the distance from this vector to a pair of coordinates.
    
    Parameters:
    
    xx - x coordinate
    
    yy - y coordinate
    
    Returns:
    
    the distance, in pixels, between this vector and the pair of coordinates.
  - theta
```
public double theta()
```
    Returns the atan2 of this vector.
    
    Returns:
    
    the atan2 of this vector.
  - normalise
```
public void normalise()
```
    Normalises this vector.
  - dot
```
public double dot(Vector2d v)
```
    Calculates the dot product between this vector and the one passed by parameter.
    
    Parameters:
    
    v - the other vector.
    
    Returns:
    
    the dot product between these two vectors.
  - unitVector
```
public Vector2d unitVector()
```

Class Vector2d

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

x

y

Constructor Detail

Vector2d

Vector2d

Vector2d

Method Detail

equals

copy

set

set

zero

toString

add

add

add

wrap

subtract

subtract

mul

rotate

scalarProduct

sqr

sqDist

mag

dist

dist

theta

normalise

dot

unitVector