Thanks Ron, that suites my needs perfectly! Much appreciated. And thanks to everyone else for their ideas and suggestions, as well.
mark On Mon, Sep 29, 2008 at 2:32 PM, Ron Dippold <[EMAIL PROTECTED]> wrote: > Not built in, but here's something I wrote a while ago based on calculating > the consecutive trapezoids along the axis - this is a common algorithm. Note > the caveats in the method docs. > > - Ron > > > def poly_area( points ): > """ > Returns the area of any polygon IF the edges don't cross and > the points are given in order around the edge. > > points are [ (x,y), (x,y) ... ] > """ > > area = 0 > # start with the last point so we close it (won't hurt if it already > is) > pt1 = points[-1] > for pt2 in points: > # we save the /2.0 for the return > area += ( pt2[0] - pt1[0] ) * ( pt2[1] + pt1[1] ) # /2.0 > pt1 = pt2 > > # counterclockwise poly returns negative area > if area<0: > area *= -1 > > return area/2.0 > > > Mark S wrote: > >> Hi all, >> >> I'm wondering if there is anything built in to pygame that will report the >> area of a polygon? >> > >
