polygonCentroid

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

Usage

CENTROID = polygonCentroid(POLY)
CENTROID = polygonCentroid(PTX, PTY)

Computes center of mass of a polygon defined by POLY. POLY is a N-by-2 array of double containing coordinates of vertices.

[CENTROID, AREA] = polygonCentroid(POLY)

Also returns the (signed) area of the polygon.

Example

  % Draws the centroid of a paper hen
  x = [0 10 20  0 -10 -20 -10 -10  0];
  y = [0  0 10 10  20  10  10  0 -10];
  poly = [x' y'];
  centro = polygonCentroid(poly);
  drawPolygon(poly);
  hold on; axis equal;
  drawPoint(centro, 'bo');

References

Algo adapted from P. Bourke web page.

See also

polygons2d, polygonArea, polygonSecondAreaMoments, drawPolygon, polylineCentroid, centroid