com.esri.core.geometry

Class Point2D

java.lang.Object

com.esri.core.geometry.Point2D

All Implemented Interfaces:

Serializable

public final class Point2D
extends Object
implements Serializable

Basic 2D point class. Contains only two double fields.

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
double	x
double	y

Constructor Summary

Constructors

Constructor and Description
Point2D()
Point2D(double x, double y)

Method Summary

Methods

Modifier and Type	Method and Description
void	add(Point2D other)
void	add(Point2D p1, Point2D p2)
int	compare(Point2D other) Compares two vertices lexicographicaly.
static int	compareVectors(Point2D v1, Point2D v2) Assume vector v1 and v2 have same origin.
static Point2D	construct(double x, double y)
double	crossProduct(Point2D other)
static double	distance(Point2D pt1, Point2D pt2)
double	dotProduct(Point2D other)
boolean	equals(Object other)
boolean	equals(Point2D other)
int	getQuarter() Calculates which quarter of XY plane the vector lies in.
int	hashCode()
void	interpolate(Point2D other, double alpha)
void	interpolate(Point2D p1, Point2D p2, double alpha)
boolean	isEqual(double x_, double y_)
boolean	isEqual(Point2D other)
boolean	isEqual(Point2D other, double tol)
boolean	isNaN()
void	leftPerpendicular() 90 degree rotation, anticlockwise.
void	leftPerpendicular(Point2D pt) 90 degree rotation, anticlockwise.
double	length()
void	negate()
void	negate(Point2D other)
void	normalize()
void	normalize(Point2D other)
static int	orientationRobust(Point2D p, Point2D q, Point2D r) Calculates the orientation of the triangle formed by p->q->r.
void	rightPerpendicular() 270 degree rotation, anticlockwise.
void	rightPerpendicular(Point2D pt) 270 degree rotation, anticlockwise.
void	rotateDirect(double Cos, double Sin)
void	rotateReverse(double Cos, double Sin)
void	scale(double f)
void	scale(double f, Point2D other)
void	scaleAdd(double f, Point2D shift)
void	scaleAdd(double f, Point2D other, Point2D shift)
void	setCoords(double x, double y)
void	setCoords(Point2D other)
void	setNaN()
static double	sqrDistance(Point2D pt1, Point2D pt2)
double	sqrLength()
void	sub(Point2D other)
void	sub(Point2D p1, Point2D p2)
String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

x

public double x

y

public double y

Constructor Detail

Point2D

public Point2D()

Point2D

public Point2D(double x,
       double y)

Method Detail

construct

public static Point2D construct(double x,
                double y)

setCoords

public void setCoords(double x,
             double y)

setCoords

public void setCoords(Point2D other)

isEqual

public boolean isEqual(Point2D other)

isEqual

public boolean isEqual(double x_,
              double y_)

isEqual

public boolean isEqual(Point2D other,
              double tol)

equals

public boolean equals(Point2D other)

equals

public boolean equals(Object other)

Overrides:

equals in class Object

sub

public void sub(Point2D other)

sub

public void sub(Point2D p1,
       Point2D p2)

add

public void add(Point2D other)

add

public void add(Point2D p1,
       Point2D p2)

negate

public void negate()

negate

public void negate(Point2D other)

interpolate

public void interpolate(Point2D other,
               double alpha)

interpolate

public void interpolate(Point2D p1,
               Point2D p2,
               double alpha)

scaleAdd

public void scaleAdd(double f,
            Point2D shift)

scaleAdd

public void scaleAdd(double f,
            Point2D other,
            Point2D shift)

scale

public void scale(double f,
         Point2D other)

scale

public void scale(double f)

compare

public int compare(Point2D other)

Compares two vertices lexicographicaly.

normalize

public void normalize(Point2D other)

normalize

public void normalize()

length

public double length()

sqrLength

public double sqrLength()

distance

public static double distance(Point2D pt1,
              Point2D pt2)

dotProduct

public double dotProduct(Point2D other)

crossProduct

public double crossProduct(Point2D other)

rotateDirect

public void rotateDirect(double Cos,
                double Sin)

rotateReverse

public void rotateReverse(double Cos,
                 double Sin)

leftPerpendicular

public void leftPerpendicular()

90 degree rotation, anticlockwise. Equivalent to RotateDirect(cos(pi/2), sin(pi/2)).

leftPerpendicular

public void leftPerpendicular(Point2D pt)

90 degree rotation, anticlockwise. Equivalent to RotateDirect(cos(pi/2), sin(pi/2)).

rightPerpendicular

public void rightPerpendicular()

270 degree rotation, anticlockwise. Equivalent to RotateDirect(-cos(pi/2), sin(-pi/2)).

rightPerpendicular

public void rightPerpendicular(Point2D pt)

270 degree rotation, anticlockwise. Equivalent to RotateDirect(-cos(pi/2), sin(-pi/2)).

getQuarter

public int getQuarter()

Calculates which quarter of XY plane the vector lies in. First quarter is between vectors (1,0) and (0, 1), second between (0, 1) and (-1, 0), etc. The quarters are numbered counterclockwise. Angle intervals corresponding to quarters: 1 : [0 : 90); 2 : [90 : 180); 3 : [180 : 270); 4 : [270 : 360)

compareVectors

public static int compareVectors(Point2D v1,
                 Point2D v2)

Assume vector v1 and v2 have same origin. The function compares the vectors by angle in the counter clockwise direction from the axis X. For example, V1 makes 30 degree angle counterclockwise from horizontal x axis V2, makes 270, V3 makes 90, then compareVectors(V1, V2) == -1. compareVectors(V1, V3) == -1. compareVectors(V2, V3) == 1.

Returns:

Returns 1 if v1 is less than v2, 0 if equal, and 1 if greater.

sqrDistance

public static double sqrDistance(Point2D pt1,
                 Point2D pt2)

toString

public String toString()

Overrides:

toString in class Object

setNaN

public void setNaN()

isNaN

public boolean isNaN()

orientationRobust

public static int orientationRobust(Point2D p,
                    Point2D q,
                    Point2D r)

Calculates the orientation of the triangle formed by p->q->r. Returns 1 for counter-clockwise, -1 for clockwise, and 0 for collinear. May use high precision arithmetics for some special degenerate cases.

hashCode

public int hashCode()

Overrides:

hashCode in class Object