BufferBuilder class

Builds the buffer geometry for a given input geometry and precision model. Allows setting the level of approximation for circular arcs, and the precision model in which to carry out the computation.

When computing buffers in floating point double-precision it can happen that the process of iterated noding can fail to converge (terminate). In this case a {@link TopologyException} will be thrown. Retrying the computation in a fixed precision can produce more robust results.

@version 1.7

Constructors

BufferBuilder(BufferParameters bufParams)

Creates a new BufferBuilder, using the given parameters.

Properties

bufParams ↔ BufferParameters

getter/setter pair

edgeList ↔ EdgeList

getter/setter pair

geomFact ↔ GeometryFactory?

getter/setter pair

graph ↔ PlanarGraph?

getter/setter pair

hashCode → int

The hash code for this object.

no setter, inherited

isInvertOrientation ↔ bool

getter/setter pair

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

workingNoder ↔ Noder?

getter/setter pair

workingPrecisionModel ↔ PrecisionModel?

getter/setter pair

Methods

buffer(Geometry g, double distance) → Geometry

buildSubgraphs(List subgraphList, PolygonBuilder polyBuilder) → void

Completes the building of the input subgraphs by depth-labelling them, and adds them to the PolygonBuilder. The subgraph list must be sorted in rightmost-coordinate order.

computeNodedEdges(List bufferSegStrList, PrecisionModel precisionModel) → void

createEmptyResultGeometry() → Geometry

Gets the standard result for an empty buffer. Since buffer always returns a polygonal result, this is chosen to be an empty polygon.

createSubgraphs(PlanarGraph graph) → List

getNoder(PrecisionModel precisionModel) → Noder

insertUniqueEdge(Edge e) → void

Inserted edges are checked to see if an identical edge already exists. If so, the edge is not inserted, but its label is merged with the existing edge.

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

setNoder(Noder noder) → void

Sets the {@link Noder} to use during noding. This allows choosing fast but non-robust noding, or slower but robust noding.

setWorkingPrecisionModel(PrecisionModel pm) → void

Sets the precision model to use during the curve computation and noding, if it is different to the precision model of the Geometry. If the precision model is less than the precision of the Geometry precision model, the Geometry must have previously been rounded to that precision.

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited

Static Methods

convertSegStrings(Iterator it) → Geometry

depthDelta(Label label) → int

Compute the change in depth as an edge is crossed from R to L