org.scijava.vecmath

## Class Point4d

• All Implemented Interfaces:
Serializable, Cloneable

```public class Point4d
extends Tuple4d
implements Serializable```
A 4 element vector represented by double precision floating point x,y,z,w coordinates.
Serialized Form

• ### Fields inherited from class org.scijava.vecmath.Tuple4d

`w, x, y, z`
• ### Constructor Summary

Constructors
Constructor and Description
`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

All Methods
Modifier and Type Method and Description
`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 org.scijava.vecmath.Tuple4d

`absolute, absolute, add, add, clamp, clamp, clamp, clamp, clampMax, clampMax, clampMax, clampMax, clampMin, clampMin, clampMin, clampMin, clone, epsilonEquals, equals, equals, get, get, getW, getX, getY, getZ, hashCode, interpolate, interpolate, interpolate, interpolate, negate, negate, scale, scale, scaleAdd, scaleAdd, scaleAdd, set, set, set, set, setW, setX, setY, setZ, 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:
vecmath 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:
vecmath 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