JTS Topology Suite version 1.12

com.vividsolutions.jts.linearref
Class LocationIndexedLine

java.lang.Object
  extended by com.vividsolutions.jts.linearref.LocationIndexedLine

public class LocationIndexedLine
extends java.lang.Object

Supports linear referencing along a linear Geometry using LinearLocations as the index.


Constructor Summary
LocationIndexedLine(Geometry linearGeom)
          Constructs an object which allows linear referencing along a given linear Geometry.
 
Method Summary
 LinearLocation clampIndex(LinearLocation index)
          Computes a valid index for this line by clamping the given index to the valid range of index values
 Geometry extractLine(LinearLocation startIndex, LinearLocation endIndex)
          Computes the LineString for the interval on the line between the given indices.
 Coordinate extractPoint(LinearLocation index)
          Computes the Coordinate for the point on the line at the given index.
 Coordinate extractPoint(LinearLocation index, double offsetDistance)
          Computes the Coordinate for the point on the line at the given index, offset by the given distance.
 LinearLocation getEndIndex()
          Returns the index of the end of the line
 LinearLocation getStartIndex()
          Returns the index of the start of the line
 LinearLocation indexOf(Coordinate pt)
          Computes the index for a given point on the line.
 LinearLocation indexOfAfter(Coordinate pt, LinearLocation minIndex)
          Finds the index for a point on the line which is greater than the given index.
 LinearLocation[] indicesOf(Geometry subLine)
          Computes the indices for a subline of the line.
 boolean isValidIndex(LinearLocation index)
          Tests whether an index is in the valid index range for the line.
 LinearLocation project(Coordinate pt)
          Computes the index for the closest point on the line to the given point.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

LocationIndexedLine

public LocationIndexedLine(Geometry linearGeom)
Constructs an object which allows linear referencing along a given linear Geometry.

Parameters:
linearGeom - the linear geometry to reference along
Method Detail

extractPoint

public Coordinate extractPoint(LinearLocation index)
Computes the Coordinate for the point on the line at the given index. If the index is out of range the first or last point on the line will be returned. The Z-ordinate of the computed point will be interpolated from the Z-ordinates of the line segment containing it, if they exist.

Parameters:
length - the index of the desired point
Returns:
the Coordinate at the given index

extractPoint

public Coordinate extractPoint(LinearLocation index,
                               double offsetDistance)
Computes the Coordinate for the point on the line at the given index, offset by the given distance. If the index is out of range the first or last point on the line will be returned. The computed point is offset to the left of the line if the offset distance is positive, to the right if negative. The Z-ordinate of the computed point will be interpolated from the Z-ordinates of the line segment containing it, if they exist.

Parameters:
index - the index of the desired point
offsetDistance - the distance the point is offset from the segment (positive is to the left, negative is to the right)
Returns:
the Coordinate at the given index

extractLine

public Geometry extractLine(LinearLocation startIndex,
                            LinearLocation endIndex)
Computes the LineString for the interval on the line between the given indices.

Parameters:
startIndex - the index of the start of the interval
endIndex - the index of the end of the interval
Returns:
the linear interval between the indices

indexOf

public LinearLocation indexOf(Coordinate pt)
Computes the index for a given point on the line.

The supplied point does not necessarily have to lie precisely on the line, but if it is far from the line the accuracy and performance of this function is not guaranteed. Use project(com.vividsolutions.jts.geom.Coordinate) to compute a guaranteed result for points which may be far from the line.

Parameters:
pt - a point on the line
Returns:
the index of the point
See Also:
project

indexOfAfter

public LinearLocation indexOfAfter(Coordinate pt,
                                   LinearLocation minIndex)
Finds the index for a point on the line which is greater than the given index. If no such index exists, returns minIndex. This method can be used to determine all indexes for a point which occurs more than once on a non-simple line. It can also be used to disambiguate cases where the given point lies slightly off the line and is equidistant from two different points on the line. The supplied point does not necessarily have to lie precisely on the line, but if it is far from the line the accuracy and performance of this function is not guaranteed. Use project(com.vividsolutions.jts.geom.Coordinate) to compute a guaranteed result for points which may be far from the line.

Parameters:
pt - a point on the line
minIndex - the value the returned index must be greater than
Returns:
the index of the point greater than the given minimum index
See Also:
project

indicesOf

public LinearLocation[] indicesOf(Geometry subLine)
Computes the indices for a subline of the line. (The subline must conform to the line; that is, all vertices in the subline (except possibly the first and last) must be vertices of the line and occcur in the same order).

Parameters:
subLine - a subLine of the line
Returns:
a pair of indices for the start and end of the subline.

project

public LinearLocation project(Coordinate pt)
Computes the index for the closest point on the line to the given point. If more than one point has the closest distance the first one along the line is returned. (The point does not necessarily have to lie precisely on the line.)

Parameters:
pt - a point on the line
Returns:
the index of the point

getStartIndex

public LinearLocation getStartIndex()
Returns the index of the start of the line

Returns:

getEndIndex

public LinearLocation getEndIndex()
Returns the index of the end of the line

Returns:

isValidIndex

public boolean isValidIndex(LinearLocation index)
Tests whether an index is in the valid index range for the line.

Parameters:
length - the index to test
Returns:
true if the index is in the valid range

clampIndex

public LinearLocation clampIndex(LinearLocation index)
Computes a valid index for this line by clamping the given index to the valid range of index values

Returns:
a valid index value

JTS Topology Suite version 1.12