Orientation class

Functions to compute the orientation of basic geometric structures including point triplets (triangles) and rings. Orientation is a fundamental property of planar geometries (and more generally geometry on two-dimensional manifolds).

Orientation is notoriously subject to numerical precision errors in the case of collinear or nearly collinear points. JTS uses extended-precision arithmetic to increase the robustness of the computation.

@author Martin Davis

Constructors

Orientation()

Properties

hashCode → int
The hash code for this object.
no setterinherited
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited

Methods

noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
toString() → String
A string representation of this object.
inherited

Operators

operator ==(Object other) → bool
The equality operator.
inherited

Static Properties

CLOCKWISE → int
A value that indicates an orientation of clockwise, or a right turn.
final
COLLINEAR → int
A value that indicates an orientation of collinear, or no turn (straight).
final
COUNTERCLOCKWISE → int
A value that indicates an orientation of counterclockwise, or a left turn.
final
LEFT → int
A value that indicates an orientation of counterclockwise, or a left turn.
final
A value that indicates an orientation of clockwise, or a right turn.
final
STRAIGHT → int
A value that indicates an orientation of collinear, or no turn (straight).
final

Static Methods

index(Coordinate p1, Coordinate p2, Coordinate q) → int
Returns the orientation index of the direction of the point q relative to a directed infinite line specified by p1-p2. The index indicates whether the point lies to the {@link #LEFT} or {@link #RIGHT} of the line, or lies on it {@link #COLLINEAR}. The index also indicates the orientation of the triangle formed by the three points ( {@link #COUNTERCLOCKWISE}, {@link #CLOCKWISE}, or {@link #STRAIGHT} )
isCCW(List<Coordinate> ring) → bool
Computes whether a ring defined by an array of {@link Coordinate}s is oriented counter-clockwise.
isCCWArea(List<Coordinate> ring) → bool
isCCWFromSeq(CoordinateSequence ring) → bool
Computes whether a ring defined by an {@link CoordinateSequence} is oriented counter-clockwise.