Package org.locationtech.jtstest.testbuilder.topostretch

Class StretchedVertex

java.lang.Object

org.locationtech.jtstest.testbuilder.topostretch.StretchedVertex

public class StretchedVertex
extends java.lang.Object

Models a vertex of a Geometry which will be stretched due to being too near other segments and vertices.

Currently for simplicity a vertex is assumed to be near only one segment or other vertex. This is sufficient for most cases.

Field Summary

Fields

Modifier and Type	Field	Description
private static double	MAX_ARM_NEARNESS_ANG
private int	nearIndex
private Coordinate	nearPt
private Coordinate[]	nearPts
private LineSegment	nearSeg
private int	parentIndex
private Coordinate[]	parentLine
private static double	POINT_LINE_FLATNESS_RATIO
private Coordinate	stretchedPt
private Coordinate	vertexPt

Constructor Summary

Constructors

Constructor	Description
StretchedVertex(Coordinate vertexPt, Coordinate[] parentLine, int parentIndex, Coordinate nearPt, Coordinate[] nearPts, int nearIndex)	Creates a vertex which lies near a vertex
StretchedVertex(Coordinate vertexPt, Coordinate[] parentLine, int parentIndex, LineSegment nearSeg)	Creates a vertex for a point which lies near a line segment

Method Summary

Modifier and Type	Method	Description
private Coordinate	displaceFromCorner(Coordinate nearPt, Coordinate p1, Coordinate p2, double dist)
private Coordinate	displaceFromCornerAwayFromArms(Coordinate nearPt, Coordinate p1, Coordinate p2, double dist)	Displaces a vertex from a corner, with angle limiting used to ensure that the displacement is not close to the arms of the corner.
private Coordinate	displaceFromCornerOriginal(Coordinate nearPt, Coordinate p1, Coordinate p2, double dist)
private Coordinate	displaceFromFlatCorner(Coordinate nearPt, Coordinate p1, Coordinate p2, double dist)
private Coordinate	displaceFromPoint(Coordinate nearPt, double dist)
private Coordinate	displaceFromSeg(LineSegment nearSeg, double dist)
private Coordinate	displaceFromVertex(Coordinate nearPt, double dist)
private Coordinate	getNearRingPoint(int i)
Coordinate	getStretchedVertex(double dist)	Gets the point which this near vertex will be stretched to (by a given distance)
Coordinate	getVertexCoordinate()
private static boolean	isFlat(Coordinate p, Coordinate p1, Coordinate p2)
private boolean	isInsideCorner(Coordinate queryPt, Coordinate base, Coordinate p1, Coordinate p2)
private boolean	isNearRing()
private static double	maxAngleToBisector(double ang)
private static Vector2D	normalizedOffset(Coordinate p0, Coordinate p1, Coordinate p2)	Returns an array of pts such that p0 - p[0] - [p1] is CW.
private static Coordinate[]	orientCorner(Coordinate p0, Coordinate p1, Coordinate p2)	Returns an array of pts such that p0 - p[0] - [p1] is CW.
private static int	quadrant(Coordinate pt, Coordinate cornerBase, Coordinate[] corner)
private static Coordinate	rotateToQuadrant(Coordinate v, int quadrant)

Methods inherited from class java.lang.Object

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

Field Detail

vertexPt

private Coordinate vertexPt

parentLine

private Coordinate[] parentLine

parentIndex

private int parentIndex

nearPt

private Coordinate nearPt

nearPts

private Coordinate[] nearPts

nearIndex

private int nearIndex

nearSeg

private LineSegment nearSeg

stretchedPt

private Coordinate stretchedPt

MAX_ARM_NEARNESS_ANG

private static final double MAX_ARM_NEARNESS_ANG

See Also:

Constant Field Values

POINT_LINE_FLATNESS_RATIO

private static final double POINT_LINE_FLATNESS_RATIO

See Also:

Constant Field Values

Constructor Detail

StretchedVertex

public StretchedVertex(Coordinate vertexPt,
                       Coordinate[] parentLine,
                       int parentIndex,
                       Coordinate nearPt,
                       Coordinate[] nearPts,
                       int nearIndex)

Creates a vertex which lies near a vertex

StretchedVertex

public StretchedVertex(Coordinate vertexPt,
                       Coordinate[] parentLine,
                       int parentIndex,
                       LineSegment nearSeg)

Creates a vertex for a point which lies near a line segment

Parameters:

vertexPt -

parentLine -

parentIndex -

nearSeg -

Method Detail

getVertexCoordinate

public Coordinate getVertexCoordinate()

getStretchedVertex

public Coordinate getStretchedVertex(double dist)

Gets the point which this near vertex will be stretched to (by a given distance)

Parameters:

dist - the distance to adjust the point by

Returns:

the stretched coordinate

isNearRing

private boolean isNearRing()

getNearRingPoint

private Coordinate getNearRingPoint(int i)

displaceFromPoint

private Coordinate displaceFromPoint(Coordinate nearPt,
                                     double dist)

displaceFromSeg

private Coordinate displaceFromSeg(LineSegment nearSeg,
                                   double dist)

displaceFromVertex

private Coordinate displaceFromVertex(Coordinate nearPt,
                                      double dist)

displaceFromCornerOriginal

private Coordinate displaceFromCornerOriginal(Coordinate nearPt,
                                              Coordinate p1,
                                              Coordinate p2,
                                              double dist)

displaceFromCorner

private Coordinate displaceFromCorner(Coordinate nearPt,
                                      Coordinate p1,
                                      Coordinate p2,
                                      double dist)

maxAngleToBisector

private static double maxAngleToBisector(double ang)

displaceFromCornerAwayFromArms

private Coordinate displaceFromCornerAwayFromArms(Coordinate nearPt,
                                                  Coordinate p1,
                                                  Coordinate p2,
                                                  double dist)

Displaces a vertex from a corner, with angle limiting used to ensure that the displacement is not close to the arms of the corner.

Parameters:

nearPt -

p1 -

p2 -

dist -

Returns:

isInsideCorner

private boolean isInsideCorner(Coordinate queryPt,
                               Coordinate base,
                               Coordinate p1,
                               Coordinate p2)

isFlat

private static boolean isFlat(Coordinate p,
                              Coordinate p1,
                              Coordinate p2)

quadrant

private static int quadrant(Coordinate pt,
                            Coordinate cornerBase,
                            Coordinate[] corner)

Parameters:

pt -

cornerBase - the two vertices defining the

corner - the two vertices defining the arms of the corner, oriented CW

Returns:

the quadrant the pt lies in

rotateToQuadrant

private static Coordinate rotateToQuadrant(Coordinate v,
                                           int quadrant)

orientCorner

private static Coordinate[] orientCorner(Coordinate p0,
                                         Coordinate p1,
                                         Coordinate p2)

Returns an array of pts such that p0 - p[0] - [p1] is CW.

Parameters:

p0 -

p1 -

p2 -

Returns:

normalizedOffset

private static Vector2D normalizedOffset(Coordinate p0,
                                         Coordinate p1,
                                         Coordinate p2)

Returns an array of pts such that p0 - p[0] - [p1] is CW.

Parameters:

p0 -

p1 -

p2 -

Returns:

displaceFromFlatCorner

private Coordinate displaceFromFlatCorner(Coordinate nearPt,
                                          Coordinate p1,
                                          Coordinate p2,
                                          double dist)