Files
file	WlzPolyDecimate.c
	Functions to decimate polyline and boundary domains The functions remove vertices that are parts of straight lines as defined by a maximum distance. The algorithm starts at vertex 1, walks along the line until at least one vertex between the start and current position is more than max-dist from the straight line between vertex 1 and current. All vertices between position 1 and current-1 are removed and position 1 is incremented (to what was current-1). The process is then repeated.

file	WlzPolyEquispace.c
	Builds a new polygon domain with equi-spaced vertices.

file	WlzPolyReverse.c
	Functions to reverse the vertex ordering in a polygon domain.

file	WlzPolySmooth.c
	Smoothing operations for polylines.

file	WlzPolyToObj.c
	Makes a domain object from a polygon.

file	WlzPolyUtils.c
	Functions for manipulating polygon domains.

Data Structures
struct	_WlzPolygonDomain
	A 2D polyline domain with possible types: WLZ_POLYGON_INT, WLZ_POLYGON_FLOAT or WLZ_POLYGON_DOUBLE. Typedef: WlzPolygonDomain. More...

struct	_WlzPolygonDomain3
	A 2D polyline domain with possible types:WLZ_POLYGON_INT, WLZ_POLYGON_FLOAT or WLZ_POLYGON_DOUBLE. Typedef: WlzPolygonDomain. More...

Macros
#define	MAX_POLYSMOOTH_ITERATIONS 10

Enumerations
enum	_WlzPolyFillMode { WLZ_SIMPLE_FILL, WLZ_EVEN_ODD_FILL, WLZ_VERTEX_FILL }
	Polygon fill modes. Typedef: WlzPolyFillMode. More...

Functions
double	WlzIVtx2TriangleHeight (WlzIVertex2 *vtxs, int i, int j, int k)
	Calculate the height of a triangle from the last vertex to the line defined by the first two. Uses formula that can be derived from Faux and Pratt p57-65 or see my lab notebook #1, p17. For three vertices \(\mathbf{v_1}, \mathbf{v_2}, \mathbf{v_3},\) we define the vectors \(\mathbf{r} = \mathbf{v_2} - \mathbf{v_1}\), \(\mathbf{s} = \mathbf{v_3} - \mathbf{v_1}\) then the the required height \(h\) is given by: \[ h = \frac{\|\mathbf{r}\|^2\|\mathbf{s}\|^2 - (\mathbf{r}\cdot\mathbf{s})^2} {\|\mathbf{r}\|^2} \] . More...

WlzPolygonDomain *	WlzPolyDecimate (WlzPolygonDomain poly, int wrap, double maxDist, WlzErrorNum dstErr)
	Decimate a polyline by removing vertices that are within straight line segments as defined by a maximum distance. The algorithm starts at vertex 1, walks along the line until at least one vertex between the start and current position is more than maxDist from the straight line between vertex 1 and current. All vertices between position 1 and current-1 are removed and position 1 is incremented (to what was current-1). The process is then repeated. More...

double	WlzPolyLength (WlzPolygonDomain poly, int wrap, WlzErrorNum dstErr)
	Calculate the length of the input polyline. More...

WlzPolygonDomain *	WlzPolyEquispace (WlzPolygonDomain poly, int wrap, double spacing, int keepOrigVtxs, WlzErrorNum dstErr)
	Create a new polygon domain with vertices qually spaced along the original polyline. The wrap value is preserved and if keepOrigVtxs is non-zero then the original vertices will be kept. This results in non-equal spacing but the new line will be faithfull to the old and not "cut-corners". More...

WlzPolygonDomain *	WlzPolyReverse (WlzPolygonDomain poly, WlzErrorNum dstErr)
	Reverse the vertex ordering in a polygon domain. More...

WlzPolygonDomain *	WlzPolySmooth (WlzPolygonDomain poly, int wrap, int iterations, WlzErrorNum dstErr)
	performs iterative 1-2-1 smoothing on the polyline treating the x & y values independently. The smoothing of an integer polyline is done by converting first to double vertices then cnverting back at the end. More...

int	WlzPolyCrossings (WlzIVertex2 vtx, WlzPolygonDomain pgdm, WlzErrorNum dstErr)
	Procedure to calculate winding number of the polygon with respect to the vertex. The algorithm is from "Comp Geom in C" by O'Rourke chap 7. It assumes integer vertices and that the vertex is not on the polyline. More...

int	WlzPolyCrossingsD (WlzDVertex2 vtx, WlzPolygonDomain pgdm, WlzErrorNum dstErr)
	Procedure to calculate winding number of the polygon with respect to the vertex. The algorithm is from "Comp Geom in C" by O'Rourke chap 7. It assumes double vertices and that the vertex is not on the polyline. More...

int	WlzInsidePolyEO (WlzIVertex2 vtx, WlzPolygonDomain pgdm, WlzErrorNum dstErr)
	Procedure to calculate if a vertex is inside the polygon using the even-odd rule. Algorithm from "Comp Geom in C" by O'Rourke chap 7 Assumes integer vertices and that the vertex is not on the polyline. More...

int	WlzInsidePolyEOD (WlzDVertex2 vtx, WlzPolygonDomain pgdm, WlzErrorNum dstErr)
	Procedure to calculate if a vertex is inside the polygon using the even-odd rule. Algorithm from "Comp Geom in C" by O'Rourke chap 7 Assumes integer vertices and that the vertex is not on the polyline. More...

WlzObject *	WlzPolygonToObj (WlzObject polygon, WlzPolyFillMode fillMode, WlzErrorNum dstErr)
	Convert the input polygon to an interval domain. The domain is defined by the fillMode see WlzPolyToObj(). More...

WlzObject *	WlzPolyToObj (WlzPolygonDomain pgdm, WlzPolyFillMode fillMode, WlzErrorNum dstErr)
	Convert the input polygon to an interval domain. The domain is defined by the fillMode: WLZ_SIMPLE_FILL - all pixels with winding number non-zero; WLZ_EVEN_ODD_FILL - all pixels with odd winding number; WLZ_VERTEX_FILL - all pixels through which the polyline passes. More...

WlzObject *	WlzPolyTo8Polygon (WlzPolygonDomain pgdm, int wrap, WlzErrorNum dstErr)
	Returns the 8-connected, integer vertex polyline corresponding to the input polygon. The wrap value (number of overlapping vertices of the polygon ends) is included in case this is called to create an 8-connected boundary fro which the wrap needs to be preserved. WLZ_POLYGON_FLOAT and WLZ_POLYGON_DOUBLE polylines are converted to integer vertices using WlzValueCopyFVertexToIVertex and WlzValueCopyDVertexToIVertex respectively. More...

WlzErrorNum	WlzPolyVertices2I (WlzPolygonDomain poly, int dstArySz, WlzIVertex2 **dstPolyAry)
	Access to an polygon domain's integer vertices. More...

WlzErrorNum	WlzPolyVertices2D (WlzPolygonDomain poly, int dstArySz, WlzDVertex2 **dstPolyAry)
	Access to an polygon domain's double precision vertices. More...

Detailed Description

Macro Definition Documentation

#define MAX_POLYSMOOTH_ITERATIONS 10

Maximum number of iterations of 1-2-1 smoothing in WlzPolySmooth

Referenced by WlzPolySmooth().

Enumeration Type Documentation

enum _WlzPolyFillMode

Polygon fill modes. Typedef: WlzPolyFillMode.

Enumerator
WLZ_SIMPLE_FILL	Fill all pixels with winding number > 0
WLZ_EVEN_ODD_FILL	Fill all pixels with odd winding number
WLZ_VERTEX_FILL	Fill all pixels lying under the polyline

Function Documentation

double WlzIVtx2TriangleHeight	(	WlzIVertex2 *	vtxs,
		int	i,
		int	j,
		int	k
	)

Calculate the height of a triangle from the last vertex to the line defined by the first two. Uses formula that can be derived from Faux and Pratt p57-65 or see my lab notebook #1, p17. For three vertices \(\mathbf{v_1}, \mathbf{v_2}, \mathbf{v_3},\) we define the vectors \(\mathbf{r} = \mathbf{v_2} - \mathbf{v_1}\), \(\mathbf{s} = \mathbf{v_3} - \mathbf{v_1}\) then the the required height \(h\) is given by:

\[ h = \frac{|\mathbf{r}|^2|\mathbf{s}|^2 - (\mathbf{r}\cdot\mathbf{s})^2} {|\mathbf{r}|^2} \]

.

Returns: height of the triangle to vertex k from baseline defined by vertices i, j

Parameters

vtxs	vertex array
i	index of first vertex
j	index of second vertex
k	index of third vertex

Source:: WlzPolyDecimate.c

References _WlzIVertex2::vtX, _WlzFVertex2::vtX, _WlzDVertex2::vtX, _WlzIVertex2::vtY, _WlzFVertex2::vtY, and _WlzDVertex2::vtY.

Referenced by WlzPolyDecimate().

WlzPolygonDomain* WlzPolyDecimate	(	WlzPolygonDomain *	poly,
		int	wrap,
		double	maxDist,
		WlzErrorNum *	dstErr
	)

Decimate a polyline by removing vertices that are within straight line segments as defined by a maximum distance. The algorithm starts at vertex 1, walks along the line until at least one vertex between the start and current position is more than maxDist from the straight line between vertex 1 and current. All vertices between position 1 and current-1 are removed and position 1 is incremented (to what was current-1). The process is then repeated.

Returns: decimated polygon domain, NULL on error

Parameters

poly	input polygon domain
wrap	wrap value of the input polyline, the returned line will have wrap=1 if the input wrap >= 1
maxDist	distance parameter to test vertex removal
dstErr	error return

Source:: WlzPolyDecimate.c

References _WlzPolygonDomain::nvertices, _WlzPolygonDomain::type, _WlzPolygonDomain::vtx, WLZ_ERR_DOMAIN_NULL, WLZ_ERR_DOMAIN_TYPE, WLZ_ERR_NONE, WLZ_ERR_PARAM_DATA, WLZ_POLYGON_DOUBLE, WLZ_POLYGON_FLOAT, WLZ_POLYGON_INT, WlzIVtx2TriangleHeight(), and WlzMakePolygonDomain().

Referenced by WlzBoundDecimate(), and WlzMeshTransformVerify().

double WlzPolyLength	(	WlzPolygonDomain *	poly,
		int	wrap,
		WlzErrorNum *	dstErr
	)

Calculate the length of the input polyline.

Returns: length of the input polygon domain

Parameters

poly	input polygon domain
wrap	wrap value of the p[olygon
dstErr	error return

Source:: WlzPolyEquispace.c

References _WlzPolygonDomain::nvertices, _WlzPolygonDomain::type, _WlzIVertex2::vtX, _WlzFVertex2::vtX, _WlzDVertex2::vtX, _WlzPolygonDomain::vtx, _WlzIVertex2::vtY, _WlzFVertex2::vtY, _WlzDVertex2::vtY, WLZ_ERR_DOMAIN_NULL, WLZ_ERR_NONE, WLZ_ERR_PARAM_DATA, WLZ_POLYGON_DOUBLE, WLZ_POLYGON_FLOAT, and WLZ_POLYGON_INT.

Referenced by WlzPolyEquispace().

WlzPolygonDomain* WlzPolyEquispace	(	WlzPolygonDomain *	poly,
		int	wrap,
		double	spacing,
		int	keepOrigVtxs,
		WlzErrorNum *	dstErr
	)

Create a new polygon domain with vertices qually spaced along the original polyline. The wrap value is preserved and if keepOrigVtxs is non-zero then the original vertices will be kept. This results in non-equal spacing but the new line will be faithfull to the old and not "cut-corners".

Returns: new polygon domain with equally spaced vertices and the given wrap value

Parameters

poly	input polygon domain
wrap	wrap value of the input polygon
spacing	required spacing
keepOrigVtxs	flag to retain the original vertices, currently ignored
dstErr	error return

Source:: WlzPolyEquispace.c

References _WlzPolygonDomain::nvertices, _WlzPolygonDomain::type, _WlzIVertex2::vtX, _WlzFVertex2::vtX, _WlzDVertex2::vtX, _WlzPolygonDomain::vtx, _WlzIVertex2::vtY, _WlzFVertex2::vtY, _WlzDVertex2::vtY, WLZ_ERR_DOMAIN_NULL, WLZ_ERR_NONE, WLZ_ERR_PARAM_DATA, WLZ_NINT, WLZ_POLYGON_DOUBLE, WLZ_POLYGON_FLOAT, WLZ_POLYGON_INT, WlzMakePolygonDomain(), and WlzPolyLength().

Referenced by WlzCMeshCompSurfMapToDomain(), and WlzPolySmooth().

WlzPolygonDomain* WlzPolyReverse	(	WlzPolygonDomain *	poly,
		WlzErrorNum *	dstErr
	)

Reverse the vertex ordering in a polygon domain.

Returns: New polygon domain with vertices reversed

Parameters

poly	input polygon domain
dstErr	error return

Source:: WlzPolyReverse.c

References _WlzPolygonDomain::nvertices, _WlzPolygonDomain::type, _WlzIVertex2::vtX, _WlzFVertex2::vtX, _WlzDVertex2::vtX, _WlzPolygonDomain::vtx, _WlzIVertex2::vtY, _WlzFVertex2::vtY, _WlzDVertex2::vtY, WLZ_ERR_NONE, WLZ_ERR_OBJECT_NULL, WLZ_POLYGON_DOUBLE, WLZ_POLYGON_FLOAT, WLZ_POLYGON_INT, and WlzMakePolygonDomain().

WlzPolygonDomain* WlzPolySmooth	(	WlzPolygonDomain *	poly,
		int	wrap,
		int	iterations,
		WlzErrorNum *	dstErr
	)

performs iterative 1-2-1 smoothing on the polyline treating the x & y values independently. The smoothing of an integer polyline is done by converting first to double vertices then cnverting back at the end.

Returns: smoothed polygon domain, NULL on error

Parameters

poly	input polygon domain, same type as the input polyline but after passing through WlzPolyEquispace
wrap	wrap parameter for the input polyline, the new will have the same wrap
iterations	number of ierations of 1-2-1 smoothing
dstErr	error return

Source:: WlzPolySmooth.c

References MAX_POLYSMOOTH_ITERATIONS, _WlzPolygonDomain::nvertices, _WlzPolygonDomain::type, _WlzFVertex2::vtX, _WlzDVertex2::vtX, _WlzPolygonDomain::vtx, _WlzFVertex2::vtY, _WlzDVertex2::vtY, WLZ_ERR_DOMAIN_TYPE, WLZ_ERR_NONE, WLZ_ERR_OBJECT_NULL, WLZ_ERR_PARAM_DATA, WLZ_POLYGON_DOUBLE, WLZ_POLYGON_FLOAT, WLZ_POLYGON_INT, WlzConvertPolyType(), WlzFreePolyDmn(), and WlzPolyEquispace().

Referenced by WlzBoundSmooth().

int WlzPolyCrossings	(	WlzIVertex2	vtx,
		WlzPolygonDomain *	pgdm,
		WlzErrorNum *	dstErr
	)

Procedure to calculate winding number of the polygon with respect to the vertex. The algorithm is from "Comp Geom in C" by O'Rourke chap 7. It assumes integer vertices and that the vertex is not on the polyline.

Returns: Winding number of the polyline with respect to the vertex

Parameters

vtx	input vertex
pgdm	input polygon domain
dstErr	error return

Source:: WlzPolyToObj.c

References _WlzPolygonDomain::nvertices, _WlzPolygonDomain::type, _WlzIVertex2::vtX, _WlzPolygonDomain::vtx, _WlzIVertex2::vtY, _WlzFVertex2::vtY, _WlzDVertex2::vtY, WLZ_ERR_NONE, WLZ_ERR_POLYGON_TYPE, WLZ_POLYGON_DOUBLE, WLZ_POLYGON_FLOAT, and WLZ_POLYGON_INT.

Referenced by WlzInsidePolyEO().

int WlzPolyCrossingsD	(	WlzDVertex2	vtx,
		WlzPolygonDomain *	pgdm,
		WlzErrorNum *	dstErr
	)

Procedure to calculate winding number of the polygon with respect to the vertex. The algorithm is from "Comp Geom in C" by O'Rourke chap 7. It assumes double vertices and that the vertex is not on the polyline.

Returns: Winding number of the polyline with respect to the vertex

Parameters

vtx	input vertex
pgdm	input polygon domain
dstErr	error return

Source:: WlzPolyToObj.c

References _WlzPolygonDomain::nvertices, _WlzPolygonDomain::type, _WlzDVertex2::vtX, _WlzPolygonDomain::vtx, _WlzIVertex2::vtY, _WlzFVertex2::vtY, _WlzDVertex2::vtY, WLZ_ERR_NONE, WLZ_ERR_POLYGON_TYPE, WLZ_POLYGON_DOUBLE, WLZ_POLYGON_FLOAT, and WLZ_POLYGON_INT.

Referenced by WlzInsidePolyEOD().

int WlzInsidePolyEO	(	WlzIVertex2	vtx,
		WlzPolygonDomain *	pgdm,
		WlzErrorNum *	dstErr
	)

Procedure to calculate if a vertex is inside the polygon using the even-odd rule. Algorithm from "Comp Geom in C" by O'Rourke chap 7 Assumes integer vertices and that the vertex is not on the polyline.

Returns: 1 if the vertex is "inside" the polyline, 0 otherwise

Parameters

vtx	the input test vertex
pgdm	input polygon domain
dstErr	return error

Source:: WlzPolyToObj.c

References WLZ_ERR_NONE, and WlzPolyCrossings().

Referenced by WlzPolyToObj().

int WlzInsidePolyEOD	(	WlzDVertex2	vtx,
		WlzPolygonDomain *	pgdm,
		WlzErrorNum *	dstErr
	)

Procedure to calculate if a vertex is inside the polygon using the even-odd rule. Algorithm from "Comp Geom in C" by O'Rourke chap 7 Assumes integer vertices and that the vertex is not on the polyline.

Returns: 1 if the vertex is "inside" the polyline, 0 otherwise

Parameters

vtx	the input test vertex
pgdm	input polygon domain
dstErr	return error

Source:: WlzPolyToObj.c

References _WlzIVertex2::vtX, WLZ_ERR_NONE, and WlzPolyCrossingsD().

WlzObject* WlzPolygonToObj	(	WlzObject *	polygon,
		WlzPolyFillMode	fillMode,
		WlzErrorNum *	dstErr
	)

Convert the input polygon to an interval domain. The domain is defined by the fillMode see WlzPolyToObj().

Returns: Woolz 2D domain object corresponding to the input polygon

Parameters

polygon	input polygon object
fillMode	determines what is "inside" the domain, one of: WLZ_SIMPLE_FILL, WLZ_EVEN_ODD_FILL or WLZ_VERTEX_FILL
dstErr	return error

Source:: WlzPolyToObj.c

References _WlzValues::core, _WlzObject::domain, _WlzPlaneDomain::domains, _WlzPlaneDomain::kol1, _WlzPlaneDomain::lastkl, _WlzPlaneDomain::lastln, _WlzPlaneDomain::lastpl, _WlzPlaneDomain::line1, _WlzValues::obj, _WlzDomain::p, _WlzPlaneDomain::plane1, _WlzDomain::poly, _WlzObject::type, _WlzPlaneDomain::type, _WlzObject::values, _WlzPlaneDomain::voxel_size, WLZ_2D_POLYGON, WLZ_3D_DOMAINOBJ, WLZ_EMPTY_DOMAIN, WLZ_EMPTY_OBJ, WLZ_ERR_DOMAIN_NULL, WLZ_ERR_DOMAIN_TYPE, WLZ_ERR_NONE, WLZ_ERR_OBJECT_NULL, WLZ_ERR_OBJECT_TYPE, WLZ_PLANEDOMAIN_DOMAIN, WLZ_PLANEDOMAIN_POLYGON, WLZ_TRANS_OBJ, WlzAssignDomain(), WlzFreeObj(), WlzFreePlaneDomain(), WlzMakeEmpty(), WlzMakeMain(), WlzMakePlaneDomain(), and WlzPolyToObj().

WlzObject* WlzPolyToObj	(	WlzPolygonDomain *	pgdm,
		WlzPolyFillMode	fillMode,
		WlzErrorNum *	dstErr
	)

Convert the input polygon to an interval domain. The domain is defined by the fillMode: WLZ_SIMPLE_FILL - all pixels with winding number non-zero; WLZ_EVEN_ODD_FILL - all pixels with odd winding number; WLZ_VERTEX_FILL - all pixels through which the polyline passes.

Returns: Woolz 2D domain object corresponding to the input polygon domain

Parameters

pgdm	input polygon domain
fillMode	determines which pixels are part of the domain one of: WLZ_SIMPLE_FILL, WLZ_EVEN_ODD_FILL or WLZ_VERTEX_FILL
dstErr	return error

Source:: WlzPolyToObj.c

References AlcFree(), AlcFreeStackPush(), AlcMalloc(), AlgSort(), _WlzValues::core, _WlzDomain::core, _WlzObject::domain, _WlzIntervalDomain::freeptr, _WlzDomain::i, _WlzInterval::ileft, _WlzIntervalDomain::intvlines, _WlzIntervalLine::intvs, _WlzInterval::iright, _WlzIntervalDomain::kol1, _WlzIntervalDomain::line1, _WlzPolygonDomain::nvertices, _WlzDomain::poly, _WlzIntervalDomain::type, _WlzPolygonDomain::type, _WlzIVertex2::vtX, _WlzPolygonDomain::vtx, _WlzIVertex2::vtY, WLZ_2D_DOMAINOBJ, WLZ_4_CONNECTED, WLZ_EMPTY_OBJ, WLZ_ERR_DOMAIN_NULL, WLZ_ERR_MEM_ALLOC, WLZ_ERR_NONE, WLZ_ERR_OBJECT_TYPE, WLZ_ERR_PARAM_DATA, WLZ_EVEN_ODD_FILL, WLZ_INTERVALDOMAIN_INTVL, WLZ_INTERVALDOMAIN_RECT, WLZ_POLYGON_DOUBLE, WLZ_POLYGON_FLOAT, WLZ_POLYGON_INT, WLZ_SIMPLE_FILL, WLZ_VERTEX_FILL, WlzAssignObject(), WlzDiffDomain(), WlzFreeDomain(), WlzFreeObj(), WlzInsidePolyEO(), WlzLabel(), WlzMakeEmpty(), WlzMakeInterval(), WlzMakeIntervalDomain(), WlzMakeMain(), WlzPolyTo8Polygon(), and WlzUnionN().

Referenced by WlzBoundToObj(), WlzGreyMask(), WlzGreyTemplate(), WlzMeshFromObjBox(), and WlzPolygonToObj().

WlzObject* WlzPolyTo8Polygon	(	WlzPolygonDomain *	pgdm,
		int	wrap,
		WlzErrorNum *	dstErr
	)

Returns the 8-connected, integer vertex polyline corresponding to the input polygon. The wrap value (number of overlapping vertices of the polygon ends) is included in case this is called to create an 8-connected boundary fro which the wrap needs to be preserved. WLZ_POLYGON_FLOAT and WLZ_POLYGON_DOUBLE polylines are converted to integer vertices using WlzValueCopyFVertexToIVertex and WlzValueCopyDVertexToIVertex respectively.

Returns: 8-connected polygon object

Parameters

pgdm	input polygon domain
wrap	wrap value of the new polygon domain
dstErr	error return

Source:: WlzPolyToObj.c

References AlcFree(), AlcMalloc(), _WlzValues::core, _WlzDomain::core, _WlzPolygonDomain::nvertices, _WlzDomain::poly, _WlzPolygonDomain::type, _WlzIVertex2::vtX, _WlzPolygonDomain::vtx, _WlzIVertex2::vtY, WLZ_2D_POLYGON, WLZ_EMPTY_OBJ, WLZ_ERR_DOMAIN_NULL, WLZ_ERR_MEM_ALLOC, WLZ_ERR_NONE, WLZ_ERR_OBJECT_TYPE, WLZ_ERR_PARAM_DATA, WLZ_NINT, WLZ_POLYGON_DOUBLE, WLZ_POLYGON_FLOAT, WLZ_POLYGON_INT, WlzMakeEmpty(), WlzMakeMain(), WlzMakePolygonDomain(), WlzValueCopyDVertexToIVertex(), and WlzValueCopyFVertexToIVertex().

Referenced by WlzBoundTo8Bound(), WlzCMeshTransformManyObjAsIdx(), WlzMeshTransformVerify(), and WlzPolyToObj().

WlzErrorNum WlzPolyVertices2I	(	WlzPolygonDomain *	poly,
		int *	dstArySz,
		WlzIVertex2 **	dstPolyAry
	)

Access to an polygon domain's integer vertices.

Returns: Woolz error code.

Parameters

poly	Given polygon domain.
dstArySz	Destination pointer for the number of vertices.
dstPolyAry	Destination pointer for the vertices.

References _WlzPolygonDomain::nvertices, _WlzPolygonDomain::vtx, WLZ_ERR_DOMAIN_NULL, WLZ_ERR_NONE, and WLZ_ERR_PARAM_NULL.

WlzErrorNum WlzPolyVertices2D	(	WlzPolygonDomain *	poly,
		int *	dstArySz,
		WlzDVertex2 **	dstPolyAry
	)

Access to an polygon domain's double precision vertices.

Returns: Woolz error code.

Parameters

poly	Given polygon domain.
dstArySz	Destination pointer for the number of vertices.
dstPolyAry	Destination pointer for the vertices.

References _WlzPolygonDomain::nvertices, _WlzPolygonDomain::vtx, WLZ_ERR_DOMAIN_NULL, WLZ_ERR_NONE, and WLZ_ERR_PARAM_NULL.

Files

Data Structures

Macros

Enumerations

Functions

Detailed Description

Macro Definition Documentation

Enumeration Type Documentation

Function Documentation