PolygonOps Class
Various (static method) computations for arrays of points interpreted as a polygon.
Methods
Name | Description | |
---|---|---|
addSecondMomentAreaProducts(points: IndexedXYZCollection, origin: Point3d, moments: Matrix4d): void Static | Accumulate to the matrix of area products of a polygon with respect to an origin. | |
addSecondMomentVolumeProducts(points: IndexedXYZCollection, origin: Point3d, moments: Matrix4d): void Static | Accumulate to the matrix of volume products of a polygon with respect to an origin. | |
area(points: Point3d[]): number Static | return the area of the polygon. | |
areaNormal(points: Point3d[], result?: Vector3d): Vector3d Static | return a vector which is perpendicular to the polygon and has magnitude equal to the polygon area. | |
areaNormalGo(points: IndexedXYZCollection, result?: Vector3d): Vector3d | undefined Static | return a vector which is perpendicular to the polygon and has magnitude equal to the polygon area. | |
areaXY(points: Point3d[] | IndexedXYZCollection): number Static | return the projected XY area of the polygon. | |
centroidAndAreaXY(points: Point2d[], centroid: Point2d): number | undefined Static | * Return (in caller-allocated centroid) the centroid of the xy polygon. | |
centroidAreaNormal(points: IndexedXYZCollection | Point3d[]): Ray3d | undefined Static | Return a Ray3d with (assuming the polygon is planar and not self-intersecting) | |
classifyPointInPolygon(x: number, y: number, points: XAndY[]): number | undefined Static | Test if point (x,y) is IN, OUT or ON a polygon. | |
classifyPointInPolygonXY(x: number, y: number, points: IndexedXYZCollection): number | undefined Static | Test if point (x,y) is IN, OUT or ON a polygon. | |
orientLoopsCCWForOutwardNormalInPlace(loops: IndexedReadWriteXYZCollection | IndexedReadWriteXYZCollection[], outwardNormal: Vector3d): number Static | Reverse loops as necessary to make them all have CCW orientation for given outward normal. | |
sortOuterAndHoleLoopsXY(loops: IndexedReadWriteXYZCollection[]): IndexedReadWriteXYZCollection[][] Static | If reverse loops as necessary to make them all have CCW orientation for given outward normal. | |
sumTriangleAreas(points: Point3d[] | GrowableXYZArray): number Static | Sum areas of triangles from points[0] to each far edge. | |
sumTriangleAreasXY(points: Point3d[]): number Static | Sum areas of triangles from points[0] to each far edge. | |
testXYPolygonTurningDirections(pPointArray: Point2d[] | Point3d[]): number Static | Test the direction of turn at the vertices of the polygon, ignoring z-coordinates. | |
unitNormal(points: IndexedXYZCollection, result: Vector3d): boolean Static | Return a unit normal to the plane of the polygon. |
Defined in
Last Updated: 05 June, 2020