geos::operation::overlayng::OverlayMixedPoints Class Reference

#include <OverlayMixedPoints.h>

Public Member Functions
	OverlayMixedPoints (int p_opCode, const Geometry *geom0, const Geometry *geom1, const PrecisionModel *p_pm)
std::unique_ptr< Geometry >	getResult ()

Static Public Member Functions
static std::unique_ptr< Geometry >	overlay (int opCode, const Geometry *geom0, const Geometry *geom1, const PrecisionModel *pm)

Detailed Description

Computes an overlay where one input is Point(s) and one is not. This class supports overlay being used as an efficient way to find points within or outside a polygon.

Input semantics are:

• Duplicates are removed from Point output
• Non-point output is rounded and noded using the given precision model

Output semantics are:

• An empty result is an empty atomic geometry with dimension determined by the inputs and the operation, as per overlay semantics

For efficiency the following optimizations are used:

• Input points are not included in the noding of the non-point input geometry (in particular, they do not participate in snap-rounding if that is used).
• If the non-point input geometry is not included in the output it is not rounded and noded. This means that points are compared to the non-rounded geometry. This will be apparent in the result.

Author

Martin Davis

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The documentation for this class was generated from the following file:

• OverlayMixedPoints.h