com.vividsolutions.jts.operation.buffer
Class OffsetCurveBuilder

java.lang.Object
  com.vividsolutions.jts.operation.buffer.OffsetCurveBuilder

public class OffsetCurveBuilder
extends java.lang.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 PrecisionModel.

Version:

1.7

Constructor Summary

OffsetCurveBuilder(PrecisionModel precisionModel, BufferParameters bufParams)

Method Summary

BufferParameters	getBufferParameters() Gets the buffer parameters being used to generate the curve.
Coordinate[]	getLineCurve(Coordinate[] inputPts, double distance) This method handles single points as well as LineStrings.
Coordinate[]	getOffsetCurve(Coordinate[] inputPts, double distance)
Coordinate[]	getRingCurve(Coordinate[] inputPts, 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(PrecisionModel 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 Coordinate[] getLineCurve(Coordinate[] 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 Coordinate array representing the curve

getRingCurve

public Coordinate[] getRingCurve(Coordinate[] inputPts,
                                 int side,
                                 double distance)

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

Returns:

a Coordinate array representing the curve

getOffsetCurve

public Coordinate[] getOffsetCurve(Coordinate[] inputPts,
                                   double distance)