#include <PolygonNodeTopology.h>
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static bool | isCrossing (const CoordinateXY *nodePt, const CoordinateXY *a0, const CoordinateXY *a1, const CoordinateXY *b0, const CoordinateXY *b1) |
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| static bool | isInteriorSegment (const CoordinateXY *nodePt, const CoordinateXY *a0, const CoordinateXY *a1, const CoordinateXY *b) |
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| static int | compareAngle (const CoordinateXY *origin, const CoordinateXY *p, const CoordinateXY *q) |
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Functions to compute topological information about nodes (ring intersections) in polygonal geometry.
- Author
- mdavis
◆ compareAngle()
| static int geos::algorithm::PolygonNodeTopology::compareAngle |
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const CoordinateXY * |
origin, |
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const CoordinateXY * |
p, |
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const CoordinateXY * |
q |
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Compares the angles of two vectors relative to the positive X-axis at their origin. Angles increase CCW from the X-axis.
- Parameters
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| origin | the origin of the vectors |
| p | the endpoint of the vector P |
| q | the endpoint of the vector Q |
- Returns
- a negative integer, zero, or a positive integer as this vector P has angle less than, equal to, or greater than vector Q
◆ isInteriorSegment()
| static bool geos::algorithm::PolygonNodeTopology::isInteriorSegment |
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const CoordinateXY * |
nodePt, |
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const CoordinateXY * |
a0, |
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const CoordinateXY * |
a1, |
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const CoordinateXY * |
b |
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Tests whether an segment node-b lies in the interior or exterior of a corner of a ring formed by the two segments a0-node-a1. The ring interior is assumed to be on the right of the corner (i.e. a CW shell or CCW hole). The test segment must not be collinear with the corner segments.
- Parameters
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| nodePt | the node location |
| a0 | the first vertex of the corner |
| a1 | the second vertex of the corner |
| b | the other vertex of the test segment |
- Returns
- true if the segment is interior to the ring corner
The documentation for this class was generated from the following file:
