org.opengis.geometry.coordinate
Interface Triangle

Show UML class diagram

All Superinterfaces:

GenericSurface, Polygon, SurfacePatch

@UML(identifier="GM_Triangle",
     specification=ISO_19107)
public interface Triangle
extends Polygon

A planar polygon defined by 3 corners. That is, a triangle would be the result of a constructor of the form: Polygon(LineString({P1, P2, P3, P1})) where P₁, P₂, and P₃ are three positions. Triangles have no holes. Triangle shall be used to construct triangulated surfaces.

Note: The points in a triangle can be located in terms of their corner points by defining a set of barycentric coordinates, three nonnegative numbers c₁, c₂, and c₃ such that c₁ + c₂ + c₃ = 1.0. Then, each point P in the triangle can be expressed for some set of barycentric coordinates as:

P = c₁P₁ + c₂P₂ + c₃P₃

Since:

GeoAPI 2.0

Version:

ISO 19107

Method Summary

List<Position>	getCorners() Returns the triangle corner.
TriangulatedSurface	getSurface() Returns the patch which own this surface patch.

Methods inherited from interface Polygon

getBoundary, getSpanningSurface

Methods inherited from interface SurfacePatch

getInterpolation, getNumDerivativesOnBoundary

Methods inherited from interface GenericSurface

getArea, getPerimeter, getUpNormal

Method Detail

getCorners

@UML(identifier="corners",
     obligation=MANDATORY,
     specification=ISO_19107)
List<Position> getCorners()

Returns the triangle corner. The list must contains exactly 3 elements.

getSurface

@UML(identifier="surface",
     obligation=MANDATORY,
     specification=ISO_19107)
TriangulatedSurface getSurface()

Returns the patch which own this surface patch.

Specified by:

getSurface in interface Polygon

Specified by:

getSurface in interface SurfacePatch

Returns:

The owner of this surface patch, or null if the association is not available or not implemented that way.

See Also:

Surface.getPatches(), CurveSegment.getCurve()