Namespace NetTopologySuite.Operation.Buffer

Classes

BufferCurveSetBuilder

Creates all the raw offset curves for a buffer of a Geometry. Raw curves need to be noded together and polygonized to form the final buffer area.

BufferInputLineSimplifier

Simplifies a buffer input line to remove concavities with shallow depth.

BufferOp

Computes the buffer of a geometry, for both positive and negative buffer distances.

BufferParameters

A value class containing the parameters which specify how a buffer should be constructed.

The parameters allow control over:

• Quadrant segments (accuracy of approximation for circular arcs)
• End Cap style
• Join style
• Mitre limit
• whether the buffer is single-sided

OffsetCurve

Computes an offset curve from a geometry. The offset curve is a linear geometry which is offset a specified distance from the input. If the offset distance is positive the curve lies on the left side of the input; if it is negative the curve is on the right side.

• For a LineString the offset curve is a line.
• For a Point the offset curve is an empty LineString.
• For a Polygon the offset curve is the boundary of the polygon buffer (which may be a MultiLineString).
• For a collection the output is a MultiLineString containing the element offset curves.

The offset curve is computed as a single contiguous section of the geometry buffer boundary. In some geometric situations this definition is ill-defined. This algorithm provides a "best-effort" interpretation. In particular:

• For self-intersecting lines, the buffer boundary includes offset lines for both left and right sides of the input line. Only a single contiguous portion on the specified side is returned.
• If the offset corresponds to buffer holes, only the largest hole is used.

Offset curves support setting the number of quadrant segments, the join style, and the mitre limit(if applicable) via the BufferParameters.

OffsetCurveBuilder

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).g 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.

OffsetCurveSetBuilder

Creates all the raw offset curves for a buffer of a Geometry. Raw curves need to be noded together and polygonized to form the final buffer area.

OffsetCurveVertexList

A list of the vertices in a constructed offset curve.

OldOffsetCurveBuilder

Computes the raw offset curve for a single Geometry component (ring, line or point).

VariableBuffer

Creates a buffer polygon with a varying buffer distance at each vertex along a line.

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

Enums

EndCapStyle

End cap style constants

JoinStyle

Join style constants