com.lowagie.text.pdf.parser

Class Vector

java.lang.Object

com.lowagie.text.pdf.parser.Vector

public class Vector
extends Object

Represents a vector (i.e. a point in space). This class is completely unrelated to the Vector class in the standard JRE.

For many PDF related operations, the z coordinate is specified as 1 This is to support the coordinate transformation calculations. If it helps, just think of all PDF drawing operations as occurring in a single plane with z=1.

Constructor Summary

Constructors

Constructor and Description
Vector(float x, float y, float z) Creates a new Vector

Method Summary

Modifier and Type	Method and Description
Vector	add(Vector v) Computes the sum of this vector and the specified vector
Vector	cross(Matrix by) Computes the cross product of this vector and the specified matrix
Vector	cross(Vector with) Computes the cross product of this vector and the specified vector
float	dot(Vector with) Computes the dot product of this vector with the specified vector
float	get(int index) Gets the value from a coordinate of the vector
float	length() Computes the length of this vector Note: If you are working with raw vectors from PDF, be careful - the Z axis will generally be set to 1.
float	lengthSquared() Computes the length squared of this vector.
Vector	subtract(Vector v) Computes the difference between this vector and the specified vector
String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

Vector

public Vector(float x,
              float y,
              float z)

Creates a new Vector

Parameters:

x - the X coordinate

y - the Y coordinate

z - the Z coordinate

Method Detail

get

public float get(int index)

Gets the value from a coordinate of the vector

Parameters:

index - the index of the value to get (I1, I2 or I3)

Returns:

value from a coordinate of the vector

cross

public Vector cross(Matrix by)

Computes the cross product of this vector and the specified matrix

Parameters:

by - the matrix to cross this vector with

Returns:

the result of the cross product

subtract

public Vector subtract(Vector v)

Computes the difference between this vector and the specified vector

Parameters:

v - the vector to subtract from this one

Returns:

the results of the subtraction

add

public Vector add(Vector v)

Computes the sum of this vector and the specified vector

Parameters:

v - the vector to subtract from this one

Returns:

the results of the subtraction

cross

public Vector cross(Vector with)

Computes the cross product of this vector and the specified vector

Parameters:

with - the vector to cross this vector with

Returns:

the cross product

dot

public float dot(Vector with)

Computes the dot product of this vector with the specified vector

Parameters:

with - the vector to dot product this vector with

Returns:

the dot product

length

public float length()

Computes the length of this vector Note: If you are working with raw vectors from PDF, be careful - the Z axis will generally be set to 1. If you want to compute the length of a vector, subtract it from the origin first (this will set the Z axis to 0).

For example: aVector.subtract(originVector).length();

Returns:

the length of this vector

lengthSquared

public float lengthSquared()

Computes the length squared of this vector.

The square of the length is less expensive to compute, and is often useful without taking the square root.

Note: See the important note under length()

Returns:

the square of the length of the vector

toString

public String toString()

Overrides:

toString in class Object

See Also:

Object.toString()