org.locationtech.jts.operation.buffer

Class VariableWidthBuffer

java.lang.Object

org.locationtech.jts.operation.buffer.VariableWidthBuffer

public class VariableWidthBuffer
extends Object

Creates a buffer polygon with variable width along a line.

Only single lines are supported as input, since buffer widths generally need to be specified specifically for each line.

Author:

Martin Davis

Constructor Summary

Constructors

Constructor and Description
VariableWidthBuffer(org.locationtech.jts.geom.Geometry line, double[] width) Creates a generator for a variable-width line buffer.

Method Summary

Modifier and Type	Method and Description
static org.locationtech.jts.geom.Geometry	buffer(org.locationtech.jts.geom.Geometry line, double startWidth, double endWidth) Creates a buffer polygon along a line with the width interpolated between a start width and an end width.
static org.locationtech.jts.geom.Geometry	bufferAternating(org.locationtech.jts.geom.Geometry line, double width1, double width2)
org.locationtech.jts.geom.Geometry	getResult() Gets the computed variable-width line buffer.
static double[]	interpolate(org.locationtech.jts.geom.LineString line, double start, double end) Computes a list of values for the points along a line by interpolating between values for the start and end point.

Methods inherited from class java.lang.Object

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

Constructor Detail

VariableWidthBuffer

public VariableWidthBuffer(org.locationtech.jts.geom.Geometry line,
                           double[] width)

Creates a generator for a variable-width line buffer.

Parameters:

line -

width -

Method Detail

buffer

public static org.locationtech.jts.geom.Geometry buffer(org.locationtech.jts.geom.Geometry line,
                                                        double startWidth,
                                                        double endWidth)

Creates a buffer polygon along a line with the width interpolated between a start width and an end width.

Parameters:

line - the line to buffer

startWidth - the buffer width at the start of the line

endWidth - the buffer width at the end of the line

Returns:

the variable-width buffer polygon

bufferAternating

public static org.locationtech.jts.geom.Geometry bufferAternating(org.locationtech.jts.geom.Geometry line,
                                                                  double width1,
                                                                  double width2)

interpolate

public static double[] interpolate(org.locationtech.jts.geom.LineString line,
                                   double start,
                                   double end)

Computes a list of values for the points along a line by interpolating between values for the start and end point. The interpolation is based on the distance of each point along the line relative to the total line length.

Parameters:

line - the line to interpolate along

start - the start value

end - the end value

Returns:

the array of interpolated values

getResult

public org.locationtech.jts.geom.Geometry getResult()

Gets the computed variable-width line buffer.

Returns:

a polygon