Dear Allan, thanks for your coments.
> > ## I can translate it into python in this way > > class Triangle: > > def __init__(self, points, neighbours): > > self.points = points > > self.neighbours = neighbours > > > > def TOR(self, direction): > > return (self, (direction+1)%3) > > > > def ROT(self, direction): > > return (self, (direction+2)%3) > > > > def RIGHT(self, direction): > > return (self.neighbours[(direction+2)%3]) > > > > I would ask your opinions to encapsulate a triangle into a directed > > triangle. > > I'm not totally sure what you are looking for but my first > guess would be to add a direction argument to the init > and store it as an attribute. But it sounds like you need > to add some methods too. What do you do with these > triangles? From your descriptionI'd expect to see some > methods taking other triangles as arguments? The triangulation would be used for surface modelling. The most important function is CalcZ(point(x, y)), that interpolates the elevation on the surface of a triangle. For this interpolation I have to find the corresponding triangle of the point, that can be made the fastest by walking from triangle to triangle. This is the first reason I need the neighbours. I also need to extend and update the triangulation, when a new point inserted into it. > For example you store the points but never use them. > Attributes in a class shjould be thee to support the metjods. > If the atrributes are not used by any method that implies > that they are not needed or that you are accessing them > from some function outside the class, which is probably > an indication of bad OO design. I feel that, the best would be to strore 3 separate triangles for A,B,C points, Triangulation.Append(Triangle(A,B,C)) Triangulation.Append(Triangle(B,C,A)) Triangulation.Append(Triangle(C,A,B)) And register the topological relations after it. It could be OO, and simple. As I wrote, I made it in C with structures, so it wasn't OO, but fast. I can translate a C iteration over C structures into python, to iterate over class objects, and usually I don't miss the pointers. Except now, when the algorithm based strongly on pointers and indeces :( Yours sincerely, Janos Juhasz _______________________________________________ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
