GEOS
3.8.0dev
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Finds all intersections in one or two sets of edges, using an x-axis sweepline algorithm in conjunction with Monotone Chains. More...
#include <SimpleMCSweepLineIntersector.h>
Inherits geos::geomgraph::index::EdgeSetIntersector.
Public Member Functions | |
void | computeIntersections (std::vector< Edge * > *edges, SegmentIntersector *si, bool testAllSegments) override |
void | computeIntersections (std::vector< Edge * > *edges0, std::vector< Edge * > *edges1, SegmentIntersector *si) override |
Protected Attributes | |
std::vector< SweepLineEvent * > | events |
int | nOverlaps |
Finds all intersections in one or two sets of edges, using an x-axis sweepline algorithm in conjunction with Monotone Chains.
While still O(n^2) in the worst case, this algorithm drastically improves the average-case time. The use of MonotoneChains as the items in the index seems to offer an improvement in performance over a sweep-line alone.