On Thu, Mar 23, 2006 at 10:51:42AM +0100, Theodore Papadopoulo wrote:
On Wed, 2006-03-22 at 21:52 +0100, Janek Kozicki wrote: Euclidean::Point<N> Euclidean::Line<N> // not very different from projective line ?? Euclidean::SemiLine<N> Euclidean::Segment<N> Euclidean::Simplex<N>
I like this way of representing them. And for instance, Point<2> can be a specialization that adds members x and y, them being references to coord[0] and coord[1], same thing with Point<3>. As those geometry classes are (and will) be used a lot, the main usage should be kept trivial and simple (or as others may say: KISS methodology). using namespace euclidean; template <unsigned D, class T> struct point { T coord[D]; // someone wrote about a smallvector type... }; template <class T> struct point<2, T> { point() : x(coord[0]), y(coord[1]) {} point(const T &_x, const T &_y) : x(coord[0]=_x), y(coord[1]=_y) {} T coord[2]; T &x, &y; }; something similar for rects template <unsigned D, class T> point<D, T> cross(const point<D, T> &pt1, const point<D, T> &pt2) { return // cross product, we should add specializations for each // dimension } template <unsigned D, class T> T dot(const point<D, T> &pt1, const point<D, T> &pt2) { return // same thing, specializations for each dimension } point<2,double> pt1(3,4); point<2> pt2(5,6); point<2,double> pt3 = cross(pt1, pt2); double d = dot(pt2, pt3); rect<2,double> rc(p2, pt3); double a = rc.area(); // or area(rc)? []s Rodolfo Lima _______________________________________________________ Novo Yahoo! Messenger com voz: Instale agora e fa�a liga��es de gra�a. http://br.messenger.yahoo.com/