## javax.vecmath Class Point4d

```java.lang.Object
|
+--javax.vecmath.Tuple4d
|
+--javax.vecmath.Point4d
```
All Implemented Interfaces:
java.lang.Cloneable, java.io.Serializable

public class Point4d
extends Tuple4d
implements java.io.Serializable

A 4 element vector represented by double precision floating point x,y,z,w coordinates.

Serialized Form

 Field Summary

 Fields inherited from class javax.vecmath.Tuple4d `w, x, y, z`

 Constructor Summary `Point4d()`           Constructs and initializes a Point4d to (0,0,0,0). `Point4d(double[] p)`           Constructs and initializes a Point4d from the coordinates contained in the array. ```Point4d(double x, double y, double z, double w)```           Constructs and initializes a Point4d from the specified xyzw coordinates. `Point4d(Point4d p1)`           Constructs and initializes a Point4d from the specified Point4d. `Point4d(Point4f p1)`           Constructs and initializes a Point4d from the specified Point4f. `Point4d(Tuple3d t1)`           Constructs and initializes a Point4d from the specified Tuple3d. `Point4d(Tuple4d t1)`           Constructs and initializes a Point4d from the specified Tuple4d. `Point4d(Tuple4f t1)`           Constructs and initializes a Point4d from the specified Tuple4f.

 Method Summary ` double` `distance(Point4d p1)`           Returns the distance between this point and point p1. ` double` `distanceL1(Point4d p1)`           Computes the L-1 (Manhattan) distance between this point and point p1. ` double` `distanceLinf(Point4d p1)`           Computes the L-infinite distance between this point and point p1. ` double` `distanceSquared(Point4d p1)`           Returns the square of the distance between this point and point p1. ` void` `project(Point4d p1)`           Multiplies each of the x,y,z components of the Point4d parameter by 1/w, places the projected values into this point, and places a 1 as the w parameter of this point. ` void` `set(Tuple3d t1)`           Sets the x,y,z components of this point to the corresponding components of tuple t1.

 Methods inherited from class javax.vecmath.Tuple4d `absolute, absolute, add, add, clamp, clamp, clamp, clamp, clampMax, clampMax, clampMax, clampMax, clampMin, clampMin, clampMin, clampMin, clone, epsilonEquals, equals, equals, get, get, hashCode, interpolate, interpolate, interpolate, interpolate, negate, negate, scale, scale, scaleAdd, scaleAdd, scaleAdd, set, set, set, set, sub, sub, toString`

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

 Constructor Detail

### Point4d

```public Point4d(double x,
double y,
double z,
double w)```
Constructs and initializes a Point4d from the specified xyzw coordinates.

Parameters:
`x` - the x coordinate
`y` - the y coordinate
`z` - the z coordinate
`w` - the w coordinate

### Point4d

`public Point4d(double[] p)`
Constructs and initializes a Point4d from the coordinates contained in the array.

Parameters:
`p` - the array of length 4 containing xyzw in order

### Point4d

`public Point4d(Point4d p1)`
Constructs and initializes a Point4d from the specified Point4d.

Parameters:
`p1` - the Point4d containing the initialization x y z w data

### Point4d

`public Point4d(Point4f p1)`
Constructs and initializes a Point4d from the specified Point4f.

Parameters:
`p1` - the Point4f containing the initialization x y z w data

### Point4d

`public Point4d(Tuple4f t1)`
Constructs and initializes a Point4d from the specified Tuple4f.

Parameters:
`t1` - the Tuple4f containing the initialization x y z w data

### Point4d

`public Point4d(Tuple4d t1)`
Constructs and initializes a Point4d from the specified Tuple4d.

Parameters:
`t1` - the Tuple4d containing the initialization x y z w data

### Point4d

`public Point4d(Tuple3d t1)`
Constructs and initializes a Point4d from the specified Tuple3d. The x,y,z components of this point are set to the corresponding components of tuple t1. The w component of this point is set to 1.

Parameters:
`t1` - the tuple to be copied
Since:
Java 3D 1.2

### Point4d

`public Point4d()`
Constructs and initializes a Point4d to (0,0,0,0).

 Method Detail

### set

`public final void set(Tuple3d t1)`
Sets the x,y,z components of this point to the corresponding components of tuple t1. The w component of this point is set to 1.

Parameters:
`t1` - the tuple to be copied
Since:
Java 3D 1.2

### distanceSquared

`public final double distanceSquared(Point4d p1)`
Returns the square of the distance between this point and point p1.

Parameters:
`p1` - the first point
Returns:
the square of distance between this point and point p1

### distance

`public final double distance(Point4d p1)`
Returns the distance between this point and point p1.

Parameters:
`p1` - the first point
Returns:
the distance between these this point and point p1.

### distanceL1

`public final double distanceL1(Point4d p1)`
Computes the L-1 (Manhattan) distance between this point and point p1. The L-1 distance is equal to: abs(x1-x2) + abs(y1-y2) + abs(z1-z2) + abs(w1-w2).

Parameters:
`p1` - the other point
Returns:
the L-1 distance

### distanceLinf

`public final double distanceLinf(Point4d p1)`
Computes the L-infinite distance between this point and point p1. The L-infinite distance is equal to MAX[abs(x1-x2), abs(y1-y2), abs(z1-z2), abs(w1-w2)].

Parameters:
`p1` - the other point
Returns:
the L-infinite distance

### project

`public final void project(Point4d p1)`
Multiplies each of the x,y,z components of the Point4d parameter by 1/w, places the projected values into this point, and places a 1 as the w parameter of this point.

Parameters:
`p1` - the source Point4d, which is not modified