PolylineIntersector

public static class PolylineIntersector
Finds every intersection event between two polylines, treating both as open.

Fields

NoiseUlps

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public const int NoiseUlps = 1024
The slack allowed for floating point noise, in units in the last place of the largest coordinate in a test.

Methods

ContinuesAcrossSeam

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public static bool ContinuesAcrossSeam(PolylineIntersection first, PolylineIntersection last, Polyline a, Polyline b)
Decide whether the first and last overlap events are really one overlap continuing across the seam.
Parameters:
first (PolylineIntersection)The first event along the first polyline.
last (PolylineIntersection)The last event along the first polyline.
a (Polyline)First polyline.
b (Polyline)Second polyline.
Returns: True if the last event carries on into the first across the seam.

ContinuesAcrossSecondSeam

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public static bool ContinuesAcrossSecondSeam(PolylineIntersection earlier, PolylineIntersection later, Polyline b)
Decide whether two consecutive overlap events along the first polyline are one overlap continuing across the seam of the second.
Parameters:
earlier (PolylineIntersection)The event ending at the seam of the second polyline.
later (PolylineIntersection)The event starting at that seam.
b (Polyline)Second polyline.
Returns: True if the earlier event carries on into the later one across the seam.

Intersect

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public static PolylineIntersection[] Intersect(Polyline a, Polyline b, double tolerance)
Find all intersection events between two polylines.
Parameters:
a (Polyline)First polyline.
b (Polyline)Second polyline.
tolerance (double)Largest distance at which the polylines count as touching.
Returns: All events, sorted along the first polyline.

IsSeamDuplicate

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public static bool IsSeamDuplicate(PolylineIntersection x, PolylineIntersection y, Polyline a, Polyline b)
Decide whether two point events are the same contact found twice on the seam of a closed polyline.
Parameters:
x (PolylineIntersection)One point event.
y (PolylineIntersection)Another point event.
a (Polyline)First polyline.
b (Polyline)Second polyline.
Returns: True if both events are the same contact on a seam.