GEOS
3.12.0dev

Builds the buffer geometry for a given input geometry and precision model. More...
#include <BufferBuilder.h>
Public Member Functions  
BufferBuilder (const BufferParameters &nBufParams)  
void  setWorkingPrecisionModel (const geom::PrecisionModel *pm) 
void  setNoder (noding::Noder *newNoder) 
void  setInvertOrientation (bool p_isInvertOrientation) 
std::unique_ptr< geom::Geometry >  buffer (const geom::Geometry *g, double distance) 
std::unique_ptr< geom::Geometry >  bufferLineSingleSided (const geom::Geometry *g, double distance, bool leftSide) 
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 doubleprecision it can happen that the process of iterated noding can fail to converge (terminate).
In this case a TopologyException will be thrown. Retrying the computation in a fixed precision can produce more robust results.

inline 
Creates a new BufferBuilder
nBufParams  buffer parameters, this object will keep a reference to the passed parameters so caller must make sure the object is kept alive for the whole lifetime of the buffer builder. 
std::unique_ptr<geom::Geometry> geos::operation::buffer::BufferBuilder::bufferLineSingleSided  (  const geom::Geometry *  g, 
double  distance,  
bool  leftSide  
) 
Generates offset curve for linear geometry.
g  nonareal geometry object 
distance  width of offset 
leftSide  controls on which side of the input geometry offset curve is generated. 

inline 
Sets whether the offset curve is generated using the inverted orientation of input rings. This allows generating a buffer(0) polygon from the smaller lobes of selfcrossing rings.
p_isInvertOrientation  true if input ring orientation should be inverted 

inline 
Sets the noding::Noder to use during noding. This allows choosing fast but nonrobust noding, or slower but robust noding.
newNoder  the noder to use 

inline 
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.
pm  the precision model to use 