org.deegree.framework.util
Class GeometryUtils

java.lang.Object
  org.deegree.framework.util.GeometryUtils

public class GeometryUtils
extends java.lang.Object

Version:

$Revision: 6251 $, $Date: 2007-03-19 16:59:28 +0100 (Mo, 19 Mrz 2007) $

Author:

Andreas Poth, last edited by: $Author: poth $

Constructor Summary

GeometryUtils()

Method Summary

static Curve	calcCircleCoordinates(Position center, double r, int nSeg, Position startPosition, Position endPosition, CoordinateSystem crs)
static Curve	createCurveParallel(double distance, Curve curve)
static double	distance(double xx, double yy, double xx_, double yy_)
static double	distance(Position p1, Position p2)
static Geometry	ensureClockwise(Geometry geom)
static double	getArc(double p0x, double p0y, double p1x, double p1y, double p2x, double p2y)
static <T> CollectionUtils.Mapper<T,T>	getMover(double x, double y)
static Position	intersection(Position startPoint1, Position endPoint1, Position startPoint2, Position endPoint2)
static Curve	invertOrder(Curve curve)
static Surface	invertOrder(Surface surface)
static boolean	isClockwise(Surface surface)
static boolean	isLeft(double p0x, double p0y, double p1x, double p1y, double p2x, double p2y)
static <T> T	move(T geom, double x, double y)
static Point	vectorByAngle(Point a1, Point a2, double l, double alpha, boolean useAbsoluteAngle)

Methods inherited from class java.lang.Object

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

Constructor Detail

GeometryUtils

public GeometryUtils()

Method Detail

distance

public static double distance(Position p1,
                              Position p2)

Parameters:

p1 -

p2 -

Returns:

distance between two 2D positions

distance

public static double distance(double xx,
                              double yy,
                              double xx_,
                              double yy_)

Parameters:

xx -

yy -

xx_ -

yy_ -

Returns:

distance between two points

move

public static <T> T move(T geom,
                         double x,
                         double y)

Type Parameters:

T -

Parameters:

geom -

x -

y -

Returns:

moves 2D geometries only (will discard any z values

getMover

public static <T> CollectionUtils.Mapper<T,T> getMover(double x,
                                                       double y)

Type Parameters:

T -

Parameters:

x -

y -

Returns:

a move mapper wrapper

invertOrder

public static Surface invertOrder(Surface surface)
                           throws GeometryException

Parameters:

surface -

Returns:

surface with inverted order of vertices

Throws:

GeometryException

invertOrder

public static Curve invertOrder(Curve curve)
                         throws GeometryException

Parameters:

curve -

Returns:

curve with inverted order of vertices for each segment

Throws:

GeometryException

isClockwise

public static boolean isClockwise(Surface surface)

Parameters:

surface -

Returns:

true if an array of passed Position forms a clockwise orientated ring

ensureClockwise

public static Geometry ensureClockwise(Geometry geom)
                                throws GeometryException

Parameters:

geom -

Returns:

surface or multi surface with guaranteed clockwise vertices orientation

Throws:

GeometryException

createCurveParallel

public static Curve createCurveParallel(double distance,
                                        Curve curve)
                                 throws GeometryException

Parameters:

distance - if distance is < 0 left parallel will be created

curve -

Returns:

parallel curve with distance.

Throws:

GeometryException

intersection

public static Position intersection(Position startPoint1,
                                    Position endPoint1,
                                    Position startPoint2,
                                    Position endPoint2)

Parameters:

startPoint1 -

endPoint1 -

startPoint2 -

endPoint2 -

Returns:

intersection coordinates between to lines (not line segments!!!). This means the intersection point may not lies between passed start- and end-points

vectorByAngle

public static Point vectorByAngle(Point a1,
                                  Point a2,
                                  double l,
                                  double alpha,
                                  boolean useAbsoluteAngle)

Parameters:

a1 - the first point

a2 - the second point

l - the length of the segment starting from the second point

alpha - the angle that the a1-a2 segment makes the following segment

Returns:

the point found at length l from a2 and which (connected with a2) forms an angle of alpha to a1a2.

calcCircleCoordinates

public static Curve calcCircleCoordinates(Position center,
                                          double r,
                                          int nSeg,
                                          Position startPosition,
                                          Position endPosition,
                                          CoordinateSystem crs)
                                   throws GeometryException

Parameters:

center -

r -

noOfPos -

startPosition -

endPosition -

Returns:

Throws:

GeometryException

getArc

public static double getArc(double p0x,
                            double p0y,
                            double p1x,
                            double p1y,
                            double p2x,
                            double p2y)

Parameters:

p0x -

p0y -

p1x -

p1y -

p2x -

p2y -

Returns:

arc between two line segments where p0x/p0y is common point of both segments

isLeft

public static boolean isLeft(double p0x,
                             double p0y,
                             double p1x,
                             double p1y,
                             double p2x,
                             double p2y)

Parameters:

p0x -

p0y -

p1x -

p1y -

p2x -

p2y -

Returns:

true if p2x/p2y is left of the line defined by p0x/p0y p1x/p1y