com.revolsys.jts.operation.buffer

Class OffsetCurveBuilder

java.lang.Object

com.revolsys.jts.operation.buffer.OffsetCurveBuilder

public class OffsetCurveBuilder
extends Object

Computes the raw offset curve for a single Geometry component (ring, line or point). A raw offset curve line is not noded - it may contain self-intersections (and usually will). The final buffer polygon is computed by forming a topological graph of all the noded raw curves and tracing outside contours. The points in the raw curve are rounded to a given scale.

Version:

1.7

Constructor Summary

Constructors

Constructor and Description
OffsetCurveBuilder(GeometryFactory precisionModel, BufferParameters bufParams)

Method Summary

Methods

Modifier and Type	Method and Description
BufferParameters	getBufferParameters() Gets the buffer parameters being used to generate the curve.
LineString	getLineCurve(LineString inputPts, double distance) This method handles single points as well as LineStrings.
LineString	getOffsetCurve(LineString inputPts, double distance)
LineString	getPointCurve(Point point, double distance)
LineString	getRingCurve(LineString points, int side, double distance) This method handles the degenerate cases of single points and lines, as well as rings.

Methods inherited from class java.lang.Object

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

Constructor Detail

OffsetCurveBuilder

public OffsetCurveBuilder(GeometryFactory precisionModel,
                  BufferParameters bufParams)

Method Detail

getBufferParameters

public BufferParameters getBufferParameters()

Gets the buffer parameters being used to generate the curve.

Returns:

the buffer parameters being used

getLineCurve

public LineString getLineCurve(LineString inputPts,
                      double distance)

This method handles single points as well as LineStrings. LineStrings are assumed not to be closed (the function will not fail for closed lines, but will generate superfluous line caps).

Parameters:

inputPts - the vertices of the line to offset

distance - the offset distance

Returns:

a Point array representing the curve or null if the curve is empty

getOffsetCurve

public LineString getOffsetCurve(LineString inputPts,
                        double distance)

getPointCurve

public LineString getPointCurve(Point point,
                       double distance)

getRingCurve

public LineString getRingCurve(LineString points,
                      int side,
                      double distance)

This method handles the degenerate cases of single points and lines, as well as rings.

Returns:

a Point array representing the curve or null if the curve is empty