## Class Points

• java.lang.Object
• org.jgrapht.alg.drawing.model.Points

• public abstract class Points
extends java.lang.Object
A collection of utilities to assist with point manipulation.
Author:
Dimitrios Michail
• ### Constructor Summary

Constructors
Constructor Description
Points()
• ### Method Summary

All Methods
Modifier and Type Method Description
static Point2D add​(Point2D a, Point2D b)
static boolean equals​(Point2D p1, Point2D p2)
Compare two points for equality using tolerance 1e-9.
static double length​(Point2D v)
Compute the length of a vector.
static Point2D negate​(Point2D a)
Given a vector $a$ compute $-a$.
static Point2D scalarMultiply​(Point2D a, double scalar)
Multiply a vector with a scalar.
static <S> Point2D scalarMultiply​(Point2D a, S scalar, java.util.function.BiFunction<java.lang.Double,​S,​java.lang.Double> mult)
Multiply a vector with a scalar.
static Point2D subtract​(Point2D a, Point2D b)
Subtract 2-dimensional vectors
• ### Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
• ### Constructor Detail

• #### Points

public Points()
• ### Method Detail

• #### length

public static double length​(Point2D v)
Compute the length of a vector. The length of vector $(x,y)$ is given by $\sqrt{x^2+y^2}$.
Parameters:
v - the vector
Returns:
the length of a vector

public static Point2D add​(Point2D a,
Point2D b)
Parameters:
a - the first vector
b - the second vector
Returns:
the vector $a+b$
• #### subtract

public static Point2D subtract​(Point2D a,
Point2D b)
Subtract 2-dimensional vectors
Parameters:
a - the first vector
b - the second vector
Returns:
the vector $a-b$
• #### negate

public static Point2D negate​(Point2D a)
Given a vector $a$ compute $-a$.
Parameters:
a - the vector
Returns:
the vector $-a$
• #### scalarMultiply

public static Point2D scalarMultiply​(Point2D a,
double scalar)
Multiply a vector with a scalar.
Parameters:
a - the vector
scalar - the scalar
Returns:
the result of scalar multiplication
• #### scalarMultiply

public static <S> Point2D scalarMultiply​(Point2D a,
S scalar,
java.util.function.BiFunction<java.lang.Double,​S,​java.lang.Double> mult)
Multiply a vector with a scalar.
Type Parameters:
S - the scalar type
Parameters:
a - the vector
scalar - the scalar
mult - the multiplication operator
Returns:
the result of scalar multiplication
• #### equals

public static boolean equals​(Point2D p1,
Point2D p2)
Compare two points for equality using tolerance 1e-9.
Parameters:
p1 - the first point
p2 - the second point
Returns:
whether the two points are equal or not