Functions
void	GEOM_FADE2D::edgesToPolygons (const std::vector< Edge2 > &vEdgesIn, std::vector< std::vector< Edge2 > > &vvPolygonsOut, std::vector< Edge2 > &vRemainingOut)
	Create polygons from a set of edges. More...

bool	GEOM_FADE2D::fillHole (const std::vector< std::pair< Segment2, Vector2 > > &vPolygonSegments, bool bWithRefine, bool bVerbose, std::vector< Point2 > &vCornersOut)
	Fill a hole in a 3D mesh with triangles (deprecated) More...

double	GEOM_FADE2D::getArea2D (const Point2 p0, const Point2 p1, const Point2 *p2)
	Get 2D area of a triangle. More...

void	GEOM_FADE2D::getBorders (const std::vector< Triangle2 * > &vT, std::vector< Segment2 > &vBorderSegmentsOut)
	Get Borders. More...

void	GEOM_FADE2D::getConnectedComponents (const std::vector< Triangle2 * > &vT, std::vector< std::vector< Triangle2 * > > &vvT)
	Get connected components. More...

void	GEOM_FADE2D::getDirectedEdges (const std::vector< Triangle2 * > &vT, std::vector< Edge2 > &vDirectedEdgesOut)
	Get directed edges The directed edges of `vT` are returned in `vDirectedEdgesOut`. Directed means that each edge (a,b) with two adjacent triangles in vT is returned twice, as edge(a,b) and edge(b,a).

Orientation2	GEOM_FADE2D::getOrientation2 (const Point2 p0, const Point2 p1, const Point2 *p2)
	Get the orientation of three points. More...

Orientation2	GEOM_FADE2D::getOrientation2_mt (const Point2 p0, const Point2 p1, const Point2 *p2)
	Get Orientation2 (MT) More...

void	GEOM_FADE2D::getUndirectedEdges (const std::vector< Triangle2 * > &vT, std::vector< Edge2 > &vUndirectedEdgesOut)
	Get undirected edges. More...

bool	GEOM_FADE2D::isSimplePolygon (std::vector< Segment2 > &vSegments)
	isSimplePolygon More...

void	GEOM_FADE2D::pointsToPolyline (std::vector< Point2 > &vInPoints, bool bClose, std::vector< Segment2 > &vOutSegments)
	Points-to-Polyline. More...

bool	GEOM_FADE2D::sortRing (std::vector< Segment2 > &vRing)
	Sort a vector of Segments. More...

bool	GEOM_FADE2D::sortRingCCW (std::vector< Segment2 > &vRing)
	Sort a vector of Segments. More...

Detailed Description

Function Documentation

◆ edgesToPolygons()

void GEOM_FADE2D::edgesToPolygons	(	const std::vector< Edge2 > &	vEdgesIn,
		std::vector< std::vector< Edge2 > > &	vvPolygonsOut,
		std::vector< Edge2 > &	vRemainingOut
	)

Create polygons from a set of edges.

A number of methods in Fade returns an unorganized set of edges that delimit a certain area. But sometimes it is more beneficial to have these edges organized as a set of one or more polygons. This is the purpose of the present method.

Parameters

[in]	vEdgesIn	is a vector of oriented edges
[out]	vvPolygonsOut	contains one vector<Edge2> for each polygon found in the input data.
[out]	vRemainingOut	is used to return unusable remaining edges

The present function adds one vector<Edge2> to vvPolygonsOut for each polygon found in vEdgesIn. Each such polygon starts with the leftmost vertex (and when two or more vertices share the smallest x-coordiante then the one of them with the smallest y-coordinate is chosen). Edges that do not form a closed polygon are returned in vRemainingOut.

Note: An Edge2 object represents an edge of a triangle. Triangle corners are always counterclockwise (CCW) oriented. Thus outer polygons are CCW-oriented while hole-polygons are CW-oriented, see the figure.

Polygons created by edgesToPolygons

◆ fillHole()

bool GEOM_FADE2D::fillHole	(	const std::vector< std::pair< Segment2, Vector2 > > &	vPolygonSegments,
		bool	bWithRefine,
		bool	bVerbose,
		std::vector< Point2 > &	vCornersOut
	)

Fill a hole in a 3D mesh with triangles (deprecated)

This function was experimental and is now deprecated because 3D point cloud meshing has been moved to the WOF library.

Parameters

[in]	vPolygonSegments	contains the segments of a closed, simple input polygon along with normal vectors. The segments are counterclockwise oriented and ordered with respect to the surface to be created. Check twice, the orientation is very important. The normal vectors point in the direction of the thought surface at the segment i.e., if a hole is filled, the normal vector of an adjecent triangle is taken but if a T-joint is filled the normal vector should be the average normal of the two triangles at the edge.
[in]	bWithRefine	specifies if additional vertices shall be created. (bWithRefine=true is experimental, don't use currently)
[in]	bVerbose	specifies if warnings shall be printed to stdout
[out]	vCornersOut	contains the created fill triangles, 3 corners per triangle, counterclockwise oriented.

Note: This function is deprecated because all related functionality has been moved to the WOF project.

◆ getArea2D()

double GEOM_FADE2D::getArea2D	(	const Point2 *	p0,
		const Point2 *	p1,
		const Point2 *	p2
	)

Get 2D area of a triangle.

Returns the 2D area of the triangle defined by the three input points p0, p1, p2.

Parameters

[in] p0,p1,p2 are the corners of the triangle

◆ getBorders()

void GEOM_FADE2D::getBorders	(	const std::vector< Triangle2 * > &	vT,
		std::vector< Segment2 > &	vBorderSegmentsOut
	)

Get Borders.

Computes the border of the triangles in vT. The border consists of all edges having only one adjacent triangle in vT.

Parameters

[in]	vT	are the input triangles
[out]	vBorderSegmentsOut	is used to return all border segments

◆ getConnectedComponents()

void GEOM_FADE2D::getConnectedComponents	(	const std::vector< Triangle2 * > &	vT,
		std::vector< std::vector< Triangle2 * > > &	vvT
	)

Get connected components.

This function partitions the triangles of vT into connected components i.e., connected sets of triangles. A connection between two triangles exists when they share a common edge.

Parameters

[in]	vT	Input triangles
[out]	vvT	Output components

◆ getOrientation2()

Orientation2 GEOM_FADE2D::getOrientation2	(	const Point2 *	p0,
		const Point2 *	p1,
		const Point2 *	p2
	)

Get the orientation of three points.

This function returns the exact orientation of the points p0, p1, p2 Possible values are
ORIENTATION2_COLLINEAR if p0, p1, p2 are located on a line,
ORIENTATION2_CCW if p0, p1, p2 are counterclockwise oriented
ORIENTATION2_CW if p0, p1, p2 are clockwise oriented
Not thread-safe but a bit faster than the thread-safe version

◆ getOrientation2_mt()

Orientation2 GEOM_FADE2D::getOrientation2_mt	(	const Point2 *	p0,
		const Point2 *	p1,
		const Point2 *	p2
	)

Get Orientation2 (MT)

See also: getOrientation2(const Point2* p0,const Point2* p1,const Point2* p2)

This version is thread-safe.

◆ getUndirectedEdges()

void GEOM_FADE2D::getUndirectedEdges	(	const std::vector< Triangle2 * > &	vT,
		std::vector< Edge2 > &	vUndirectedEdgesOut
	)

Get undirected edges.

The undirected edges of vT are returned vUndirectedEdgesOut.

◆ isSimplePolygon()

bool GEOM_FADE2D::isSimplePolygon ( std::vector< Segment2 > & vSegments )

isSimplePolygon

Parameters

[in] vSegments specifies segments to be checked. Degenerate segments (0-length) are ignored.

Returns: true if vSegments contains a closed polygon without selfintersections. False otherwise.

◆ pointsToPolyline()

void GEOM_FADE2D::pointsToPolyline	(	std::vector< Point2 > &	vInPoints,
		bool	bClose,
		std::vector< Segment2 > &	vOutSegments
	)

Points-to-Polyline.

Turns a vector of points (p0,p1,p2,...pm,pn) into a vector of segments ((p0,p1),(p1,p2),...,(pm,pn)). In case that bClose is true an additional segment (pn,p0) is constructed. Degenerate segments are ignored. Selfintersections of the polyline are not checked.

Parameters

[in]	vInPoints
[in]	bClose	specifies whether a closing segment shall be constructed
[out]	vOutSegments	is where the output segments are stored

◆ sortRing()

bool GEOM_FADE2D::sortRing ( std::vector< Segment2 > & vRing )

Sort a vector of Segments.

The segments in vRing are reoriented and sorted such that subsequent segments join at the endpoints.

◆ sortRingCCW()

bool GEOM_FADE2D::sortRingCCW ( std::vector< Segment2 > & vRing )

Sort a vector of Segments.

The segments in vRing are reoriented and sorted such that the resulting polygon is counterclockwise oriented and subsequent segments join at the endpoints.

Functions

Detailed Description

Function Documentation

◆ edgesToPolygons()

◆ fillHole()

◆ getArea2D()

◆ getBorders()

◆ getConnectedComponents()

◆ getOrientation2()

◆ getOrientation2_mt()

◆ getUndirectedEdges()

◆ isSimplePolygon()

◆ pointsToPolyline()

◆ sortRing()

◆ sortRingCCW()