Val Samko wrote:
RD> MFC gets the intended use of CPoint/CSize wrong.
RD> In a mathematical sense, a point is a 0-size location in an nD RD> coordinate system. In this case, it is a 2D coordinate system, so is RD> (x,y). This is used for positioning, e.g. moving the graphics cursor, so RD> I call it gui::position. It does not make sense to perform point [+-*/]= RD> point since points are locations in a space (how do I add the location RD> of my house to the location of Jupiter)?
I do not follow your logic. In mathematics, in Cartesian nD coordinate system, a point is represented by a set of distances between that point and the centre of coordinates, along each axe. Just like a vector. And vectorA + vectorB is a very common operation.
Yes, a point is taken w.r.t. the centre coordinates, but that does not mean that it behaves like a vector. All that means is that it is identifying a position in nD space, for example, a button is at (3,4) from a frame's client area. If you look up Point at MathWorld (http://mathworld.wolfram.com/Point.html) there is no reference to adding two points together, whereas for vectors (http://mathworld.wolfram.com/Vector.html) there is. Regards, Reece