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curvature


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 -- Function File: KAPPA = curvature (T, PX, PY,METHOD,DEGREE)
 -- Function File: KAPPA = curvature (T, POLY,METHOD,DEGREE)
 -- Function File: KAPPA = curvature (PX, PY,METHOD,DEGREE)
 -- Function File: KAPPA = curvature (POINTS,METHOD,DEGREE)
 -- Function File: [KAPPA POLY T] = curvature (...)
     Estimate curvature of a polyline defined by points.

     First compute an approximation of the curve given by PX and PY,
     with the parametrization T.  Then compute the curvature of
     approximated curve for each point.  METHOD used for approximation
     can be only: 'polynom', with specified degree.  Further methods
     will be provided in a future version.  T, PX, and PY are N-by-1
     array of the same length.  The points can be specified as a single
     N-by-2 array.

     If the argument T is not given, the parametrization is estimated
     using function 'parametrize'.

     If requested, POLY contains the approximating polygon evlauted at
     the parametrization T.

     See also: parametrize, polygons2d.


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Estimate curvature of a polyline defined by points.



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distancePointPolygon


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 -- Function File: DIST = distancePointPolygon (POINT,POLY)
     Compute shortest distance between a point and a polygon

     See also: polygons2d, points2d, distancePointPolyline,
     distancePointEdge, projPointOnPolyline.


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Compute shortest distance between a point and a polygon



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distancePointPolyline


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 -- Function File: DIST = distancePointPolyline (POINT,POLY)
     Compute shortest distance between a point and a polyline Example:
                pt1 = [30 20];
                pt2 = [30 5];
                poly = [10 10;50 10;50 50;10 50];
                distancePointPolyline([pt1;pt2], poly)
                ans =
                    10
                     5

     See also: polygons2d, points2d,distancePointEdge,
     projPointOnPolyline.


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Compute shortest distance between a point and a polyline Example:
           pt1



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distancePolygons


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 -- Function File: DIST = distancePolygons (POLY1,POLY2)
     Compute the shortest distance between 2 polygons


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Compute the shortest distance between 2 polygons



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drawPolygon


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 -- Function File: H = drawPolygon (COORD)
 -- Function File: H = drawPolygon (PX, PY)
 -- Function File: H = drawPolygon (POLYS)
     Draw a polygon specified by a list of points.

     drawPolygon(COORD); Packs coordinates in a single [N*2] array.

     drawPolygon(PX, PY); Specifies coordinates in separate arrays.

     drawPolygon(POLYS) Packs coordinate of several polygons in a cell
     array.  Each element of the array is a Ni*2 double array.

     H = drawPolygon(...); Also return a handle to the list of line
     objects.

     See also: polygons2d, drawCurve.


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Draw a polygon specified by a list of points.



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drawPolyline


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 -- Function File: = drawPolyline (, )
     DRAWPOLYLINE Draw a polyline specified by a list of points

     drawPolyline(COORD); packs coordinates in a single [N*2] array.

     drawPolyline(PX, PY); specifies coordinates in separate arrays.  PX
     and PY must be column vectors with the same length.

     drawPolyline(..., TYPE); where TYPE is either 'closed' or 'open',
     specifies if last point must be connected to the first one
     ('closed') or not ('open').  Default is 'open'.

     drawPolyline(..., PARAM, VALUE); specify plot options as described
     for plot command.

     H = drawPolyline(...)  also return a handle to the list of line
     objects.

     Example:
            # Draw a curve representing an ellipse
            t = linspace(0, 2*pi, 100)';
            px = 10*cos(t); py = 5*sin(t);
            drawPolyline([px py], 'closed');
            axis equal;

            # The same, with different drawing options
            drawPolyline([px py], 'closed', 'lineWidth', 2, 'lineStyle', '--');
  

     See also: polygons2d, drawPolygon.


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DRAWPOLYLINE Draw a polyline specified by a list of points



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expandPolygon


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 -- Function File: LOOPS = expandPolygon (POLY, DIST)
     Expand a polygon by a given (signed) distance

     Associates to each edge of the polygon POLY the parallel line
     located at distance DIST from the current edge, and compute
     intersections with neighbor parallel lines.  The resulting polygon
     is simplified to remove inner "loops", and can be disconnected.
     The result is a cell array, each cell containing a simple linear
     ring.

     This is a kind of dilation, but behaviour on corners is different.
     This function keeps angles of polygons, but there is no direct
     relation between length of 2 polygons.

     It is also possible to specify negative distance, and get all
     points inside the polygon.  If the polygon is convex, the result
     equals morphological erosion of polygon by a ball with radius equal
     to the given distance.

     See also: polygons2d.


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Expand a polygon by a given (signed) distance



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medialAxisConvex


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 -- Function File: [N E] = medialAxisConvex (POLYGON)
     Compute medial axis of a convex polygon

     POLYGON is given as a set of points [x1 y1;x2 y2 ...], returns the
     medial axis of the polygon as a graph.  N is a set of nodes.  The
     first elements of N are the vertices of the original polygon.  E is
     a set of edges, containing indices of source and target nodes.
     Edges are sorted according to order of creation.  Index of first
     vertex is lower than index of last vertex, i.e.  edges always point
     to newly created nodes.

     Notes: - Is not fully implemented, need more development (usually
     crashes for polygons with more than 6-7 points...)  - Works only
     for convex polygons.  - Complexity is not optimal: this algorithm
     is O(n*log n), but linear algorithms exist.

     See also: polygons2d, bisector.


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Compute medial axis of a convex polygon



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parametrize


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 -- Function File: PAR = parametrize (POLY)
 -- Function File: PAR = parametrize (PX,PY)
 -- Function File: PAR = parametrize (...,NORMALIZE)

     Parametrization of a curve, based on edges length

     Returns a parametrization of the curve defined by the serie of
     points, based on euclidean distance between two consecutive points.
     POLY is a N-by-2 array, representing coordinates of vertices.  The
     result PAR is N-by-1, and contains the cumulative length of edges
     until corresponding vertex.  The function also accepts the polygon
     as two inputs PX and PY representinx coordinates x and y
     respectively.  When optional argument NORMALIZE is non-empty PAR is
     rescaled such that the last element equals 1, i.e.  'PAR(end)==1'.

     Example
              # Parametrize a circle approximation
              poly = circleToPolygon([0 0 1], 200);
              p = parametrize(poly);
              p(end)
              ans =
                  6.2829
              p = parametrize(poly,'norm');
              p(end)
              ans =
                  1
              p = parametrize(poly,true);
              p(end)
              ans =
                  1

     See also: polygons2d, polylineLength.


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Parametrization of a curve, based on edges length



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polygon2shape


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 -- Function File: SHAPE = polygon2shape (POLYGON)
     Converts a polygon to a shape with edges defined by smooth
     polynomials.

     POLYGON is a N-by-2 matrix, each row representing a vertex.  SHAPE
     is a N-by-1 cell, where each element is a pair of polynomials
     compatible with polyval.

     In its current state, the shape is formed by polynomials of degree
     1.  Therefore the shape representation costs more memory except for
     colinear points in the polygon.

     See also: shape2polygon, simplifypolygon, polyval.


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Converts a polygon to a shape with edges defined by smooth polynomials.



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polygonArea


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 -- Function File: AREA = polygonArea (POINTS)
 -- Function File: AREA = polygonArea (PX,PY)
     Compute the signed area of a polygon.

     Compute area of a polygon defined by POINTS.  POINTS is a N-by-2
     matrix containing coordinates of vertices.

     Vertices of the polygon are supposed to be oriented
     Counter-Clockwise (CCW). In this case, the signed area is positive.
     If vertices are oriented Clockwise (CW), the signed area is
     negative.

     If polygon is self-crossing, the result is undefined.

     If POINTS is a cell, each element is considered a polygon and the
     area of each one is returned in the matrix AREA.  The matrix has
     the same shape as the cell.

     References: Algorithm adapted from P. Bourke web page
     http://local.wasp.uwa.edu.au/~pbourke/geometry/polyarea/

     See also: polygons2d, polygonCentroid, drawPolygon.


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Compute the signed area of a polygon.



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polygonCentroid


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 -- Function File: [ PT, AREA ] = polygonCentroid (POINTS)
 -- Function File: [ ... ]= polygonCentroid (PTX,PTY)
     Compute the centroid (center of mass) of a polygon.

     Computes the center of mass of a polygon defined by POINTS.  POINTS
     is a N-by-2 matrix.  The two columns can be given separately using
     PTX and PTY for the x and y component respectively.

     The area of the polygon is returned in the second output argument.

     Adapted from
     <http://local.wasp.uwa.edu.au/~pbourke/geometry/polyarea/>

     See also: polygons2d, polygonArea, drawPolygon.


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Compute the centroid (center of mass) of a polygon.



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polygonLoops


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 -- Function File: LOOPS = polygonLoops (POLY)
     Divide a possibly self-intersecting polygon into a set of simple
     loops

     POLY is a polygone defined by a series of vertices, LOOPS is a cell
     array of polygons, containing the same vertices of the original
     polygon, but no loop self-intersect, and no couple of loops
     intersect each other.

     Example:
                poly = [0 0;0 10;20 10;20 20;10 20;10 0];
                loops = polygonLoops(poly);
                figure(1); hold on;
                drawPolygon(loops);
                polygonArea(loops)

     See also: polygons2d, polygonSelfIntersections.


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Divide a possibly self-intersecting polygon into a set of simple loops



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polygonPoint


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 -- Function File: POINT = polygonPoint (POLY, POS)
     Extract a point from a polygon

     See also: polygons2d, polylinePoint.


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Extract a point from a polygon



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polygonSelfIntersections


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 -- Function File: PTS = polygonSelfIntersections (POLY)
 -- Function File: [PTS POS1 POS2] = polygonSelfIntersections (POLY)
     Find-self intersection points of a polygon

     Return the position of self intersection points

     Also return the 2 positions of each intersection point (the
     position when meeting point for first time, then position when
     meeting point for the second time).

     Example
                # use a '8'-shaped polygon
                poly = [10 0;0 0;0 10;20 10;20 20;10 20];
                polygonSelfIntersections(poly)
                ans =
                    10 10

     See also: polygons2d, polylineSelfIntersections.


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Find-self intersection points of a polygon



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polygonSubcurve


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 -- Function File: POLY2 = polygonSubcurve (POLYGON, POS0,POS1)
     Extract a portion of a polygon

     Create a new polyline, by keeping vertices located between
     positions POS0 and POS1, and adding points corresponding to
     positions POS0 and POS1 if they are not already vertices.

     Example:
          Nv    = 100;
          poly  = circleAsPolygon ([10 20 30], Nv);
          poly2 = polygonSubcurve (poly, 15, 65);
          drawPolyline (poly2);

     See also: polygons2d, polylineSubcurve.


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Extract a portion of a polygon



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polygons2d


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 -- Function File: polygons2d ()
     Description of functions operating on 2D polygons

     The 'polygons' module contains functions operating on shapes
     composed of a vertex list, like polygons or polylines.

     We call 'polyline' the curve defined by a series of vertices.  A
     polyline can be either closed or open, depending on whether the
     last vertex is connected to the first one or not.  This can be
     given as an option is some functions in the module.  A 'polygon' is
     the planar domain delimited by a closed polyline.  We sometimes
     want to consider 'complex polygons', whose boundary is composed of
     several disjoint domains.  The domain defined by a single closed
     polyline is called 'simple polygon'.  We call 'curve' a polyline
     with many vertices, such that the polyline can be considered as a
     discrete approximation of a "real" curve.

     A simple polygon or polyline is represented by a N-by-2 array, each
     row of the array representing the coordinates of a vertex.  Simple
     polygons are assumed to be closed, so there is no need to repeat
     the first vertex at the end.  As both polygons and polylines can be
     represented by a list of vertex coordinates, some functions also
     consider the vertex list itself.  Such functions are prefixed by
     'pointSet'.  Also, many functions prefixed by 'polygon' or
     'polyline' works also on the other type of shape.

     For multiple-connected polygons, the different connected boundaries
     are separated by a row [NaN NaN].

     For some functions, the orientation of the polygon can be relevant:
     CCW stands for 'Conter-Clockwise' (positive orientation), CW stands
     for 'Clockwise'.

     Polylines are parametrized in the following way: * the i-th vertex
     is located at position i-1 * points of the i-th edge have positions
     ranging linearly from i-1 to i The parametrization domain for an
     open polyline is from 0 to Nv-1, and from 0 to Nv for a closed
     polyline (positions 0 and Nv correspond to the same point).

     Example: # Simple polygon: P1 = [1 1;2 1;2 2;1 2]; drawPolygon(P1);
     axis([0 5 0 5]); # Multiple polygon: P2 = [10 10;40 10;40 40;10
     40;NaN NaN;20 20;20 30;30 30;30 20]; figure;drawPolygon(P2);
     axis([0 50 0 50]);

     Point Sets pointSetBounds - Bounding box of a set of points
     pointSetsAverage - Compute the average of several point sets
     minimumCaliperDiameter - Minimum caliper diameter of a set of
     points findPoint - Find index of a point in an set from its
     coordinates

     Polylines polylinePoint - Extract a point from a polyline
     polylineLength - Return length of a polyline given as a list of
     points polylineCentroid - Compute centroid of a curve defined by a
     series of points polylineSubcurve - Extract a portion of a polyline
     reversePolyline - Reverse a polyline, by iterating vertices from
     the end isPointOnPolyline - Test if a point belongs to a polyline
     projPointOnPolyline - Compute position of a point projected on a
     polyline distancePointPolyline - Compute shortest distance between
     a point and a polyline distancePolylines - Compute the shortest
     distance between 2 polylines intersectPolylines - Find the common
     points between 2 polylines polylineSelfIntersections - Find
     self-intersections points of a polyline

     Curves (polylines with lot of vertices) parametrize -
     Parametrization of a curve, based on edges length curvature -
     Estimate curvature of a polyline defined by points cart2geod -
     Convert cartesian coordinates to geodesic coord.  geod2cart -
     Convert geodesic coordinates to cartesian coord.  curveMoment -
     Compute inertia moment of a 2D curve curveCMoment - Compute
     centered inertia moment of a 2D curve curveCSMoment - Compute
     centered scaled moment of a 2D curve

     Polygons polygonPoint - Extract a point from a polygon
     polygonSubcurve - Extract a portion of a polygon reversePolygon -
     Reverse a polygon, by iterating vertices from the end
     projPointOnPolygon - Compute position of a point projected on a
     polygon splitPolygons - Convert a NaN separated polygon list to a
     cell array of polygons clipPolygon - Clip a polygon with a
     rectangular box clipPolygonHP - Clip a polygon with a Half-plane
     defined by a directed line intersectLinePolygon - Intersection
     points between a line and a polygon intersectRayPolygon -
     Intersection points between a ray and a polygon
     polygonSelfIntersections - Find-self intersection points of a
     polygon convexHull - Convex hull of a set of points polygonLoops -
     Divide a possibly self-intersecting polygon into a set of simple
     loops expandPolygon - Expand a polygon by a given (signed) distance
     medialAxisConvex - Compute medial axis of a convex polygon

     Measures on Polygons isPointInPolygon - Test if a point is located
     inside a polygon polygonContains - Test if a point is contained in
     a multiply connected polygon polygonCentroid - Compute the centroid
     (center of mass) of a polygon polygonArea - Compute the signed area
     of a polygon polygonLength - Perimeter of a polygon
     polygonNormalAngle - Compute the normal angle at a vertex of the
     polygon polygonBounds - Compute the bounding box of a polygon
     distancePointPolygon - Compute shortest distance between a point
     and a polygon distancePolygons - Compute the shortest distance
     between 2 polygons

     Triangles isPointInTriangle - Test if a point is located inside a
     triangle triangleArea - Area of a triangle

     Functions from stochastic geometry steinerPoint - Compute steiner
     point (weighted centroid) of a polygon steinerPolygon - Create a
     Steiner polygon from a set of vectors supportFunction - Compute
     support function of a polygon convexification - Compute the
     convexification of a polygon

     Input, Output and conversions readPolygon - Read a polygon stored
     in a file polygonToRow - Convert polygon coordinates to a row
     vector rowToPolygon - Create a polygon from a row vector
     rectAsPolygon - Convert a (centered) rectangle into a series of
     points

     Drawing functions drawPolyline - Draw a polyline specified by a
     list of points drawPolygon - Draw a polygon specified by a list of
     points fillPolygon - Fill a polygon specified by a list of points

     Credits: * function intersectPolylines uses the 'interX'
     contribution from "NS" (file exchange 22441, called
     'curve-intersections')

     --- Author: David Legland e-mail: david.legland@grignon.inra.fr
     created the 07/11/2005.  Homepage:
     <http://matgeom.sourceforge.net/>
     <http://www.pfl-cepia.inra.fr/index.php?page=geom2d> Copyright INRA
     - Cepia Software Platform.


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Description of functions operating on 2D polygons



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polylineSelfIntersections


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 -- Function File: PTS = polylineSelfIntersections (POLY)
     Find self-intersections points of a polyline

     Return the position of self intersection points

     Also return the 2 positions of each intersection point (the
     position when meeting point for first time, then position when
     meeting point for the second time).

     Example
                # use a gamma-shaped polyline
                poly = [0 0;0 10;20 10;20 20;10 20;10 0];
                polylineSelfIntersections(poly)
                ans =
                    10 10

                # use a 'S'-shaped polyline
                poly = [10 0;0 0;0 10;20 10;20 20;10 20];
                polylineSelfIntersections(poly)
                ans =
                    10 10

     See also: polygons2d, intersectPolylines, polygonSelfIntersections.


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Find self-intersections points of a polyline



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reversePolygon


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 -- Function File: POLY2 = reversePolygon (POLY)
     Reverse a polygon, by iterating vertices from the end

     POLY2 = reversePolygon(POLY) POLY2 has same vertices as POLY, but
     in different order.  The first vertex of the polygon is still the
     same.

     See also: reversePolyline.


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Reverse a polygon, by iterating vertices from the end



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reversePolyline


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 -- Function File: POLY2 = reversePolyline (POLY)
     Reverse a polyline, by iterating vertices from the end

     POLY2 = reversePolyline(POLY) POLY2 has same vertices as POLY, but
     POLY2(i,:) is the same as POLY(END-i+1,:).

     See also: reversePolygon.


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Reverse a polyline, by iterating vertices from the end



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simplifypolygon


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 -- Function File: SPOLY = simplifypolygon (POLY)
     Simplify a polygon using the Ramer-Douglas-Peucker algorithm.

     POLY is a N-by-2 matrix, each row representing a vertex.

     See also: simplifypolyline, shape2polygon.


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Simplify a polygon using the Ramer-Douglas-Peucker algorithm.



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simplifypolyline


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 -- Function File: [PLINE2 IDX] = simplifypolyline (PLINE)
 -- Function File: ... = simplifypolyline (...,PROPERTY,VALUE,...)
     Simplify or subsample a polyline using the Ramer-Douglas-Peucker
     algorithm, a.k.a.  the iterative end-point fit algorithm or the
     split-and-merge algorithm.

     The PLINE as a N-by-2 matrix.  Rows correspond to the verices
     (compatible with 'polygons2d').  The vector IDX constains the
     indexes on vetices in PLINE that generates PLINE2, i.e.  'pline2 =
     pline(idx,:)'.

     *Parameters*
     ''Nmax''
          Maximum number of vertices.  Default value '1e3'.
     ''Tol''
          Tolerance for the error criteria.  Default value '1e-4'.
     ''MaxIter''
          Maximum number of iterations.  Default value '10'.
     ''Method''
          Not implemented.

     Run 'demo simplifypolyline' to see an example.

     See also: curve2polyline, curveval.


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Simplify or subsample a polyline using the Ramer-Douglas-Peucker
algorithm, a.k.



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splitPolygons


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 -- Function File: POLYGONS = splitPolygons (POLYGON)
     Convert a NaN separated polygon list to a cell array of polygons.

     POLYGON is a N-by-2 array of points, with possibly couples of NaN
     values.  The functions separates each component separated by NaN
     values, and returns a cell array of polygons.

     See also: polygons2d.


# name: <cell-element>
# type: sq_string
# elements: 1
# length: 65
Convert a NaN separated polygon list to a cell array of polygons.



# name: <cell-element>
# type: sq_string
# elements: 1
# length: 15
supportFunction


# name: <cell-element>
# type: sq_string
# elements: 1
# length: 509
 -- Function File: H = suppportFunction (POLYGON)
 -- Function File: H = suppportFunction (POLYGON, N)
 -- Function File: H = suppportFunction (POLYGON, V)
     Compute support function of a polygon

     H = supportFunction(POLYGON, N) uses N points for suport function
     approximation

     H = supportFunction(POLYGON) assume 24 points for approximation

     H = supportFunction(POLYGON, V) where V is a vector, uses vector V
     of angles to compute support function.

     See also: convexification.


# name: <cell-element>
# type: sq_string
# elements: 1
# length: 37
Compute support function of a polygon





