DELPHI AREA Forum

1. how calculate where should be positioned points and control points in bezier curve (windows implementation), so the curve would go trouught specified list of points?

2. How to anti-alias that curve, so it would look smooth?

As for question no.1 check out this article:

http://groups.google.nl/groups?hl=nl&lr;=&selm;=3666E4C4.6F65%40math.okstate.edu&rnum;=5

Cheers,
Stefan

OK, got tat, bu how about this whole anti-aliasing thing?

indeed

umm, would anti-aliasing the line-pieces of the curve be enough?

I quite don't understand...

Here's some code I use in TExtGraph to get all the line-parts of a bézier curve:

Code: Select all

  BeginPath(Canvas.Handle);
  PolyBezier(Canvas.Handle, points, 4);
  EndPath(Canvas.Handle);
  FlattenPath(Canvas.Handle);
  NumLine := getpath(Canvas.Handle, lpPoints, lpTypes, 0);
  setlength(lppoints, NumLine);
  setlength(lptypes, NumLine);
  GetPath(Canvas.Handle, lppoints[0], lptypes[0], NumLine);
  for i := 0 to NumLine-1 do begin
    case lpTypes[i] of
      PT_MOVETO: Canvas.MoveTo(lppoints[i].x, lppoints[i].y);
      PT_LINETO: Canvas.LineTo(lppoints[i].x, lppoints[i].y);
    end;
  end;


after this you could (in the for-loop) anti-alias all the lines...