1.1 --- a/src/lemon/bezier.h	Sun Jan 16 22:29:28 2005 +0000
     1.2 +++ b/src/lemon/bezier.h	Sun Jan 16 22:31:26 2005 +0000
     1.3 @@ -21,7 +21,7 @@
     1.4  ///\file
     1.5  ///\brief Classes to compute with Bezier curves.
     1.6  ///
     1.7 -///Up to now this file is internally used by \ref graph_to_eps.h
     1.8 +///Up to now this file is used internally by \ref graph_to_eps.h
     1.9  ///
    1.10  ///\author Alpar Juttner
    1.11  
    1.12 @@ -58,7 +58,11 @@
    1.13    {
    1.14      return Bezier1(conv(p1,p2,t),p2);
    1.15    }
    1.16 -  Bezier1 operator()(double a,double b) { return before(b).after(a/b); }  
    1.17 +  Bezier1 revert() { return Bezier1(p2,p1);}
    1.18 +  Bezier1 operator()(double a,double b) { return before(b).after(a/b); }
    1.19 +  xy grad() { return p2-p1; }
    1.20 +  xy grad(double t) { return grad(); }
    1.21 +
    1.22  };
    1.23  
    1.24  class Bezier2 : public BezierBase
    1.25 @@ -87,8 +91,10 @@
    1.26      xy r(conv(p2,p3,t));
    1.27      return Bezier2(conv(q,r,t),r,p3);
    1.28    }
    1.29 +  Bezier2 revert() { return Bezier2(p3,p2,p1);}
    1.30    Bezier2 operator()(double a,double b) { return before(b).after(a/b); }
    1.31 -  
    1.32 +  Bezier1 grad() { return Bezier1(2.0*(p2-p1),2.0*(p3-p2)); }
    1.33 +  xy grad(double t) { return grad()(t); }  
    1.34  };
    1.35  
    1.36  class Bezier3 : public BezierBase
    1.37 @@ -130,8 +136,10 @@
    1.38        xy c(conv(a,b,t));
    1.39        return Bezier3(c,b,r,p4);
    1.40      }
    1.41 +  Bezier3 revert() { return Bezier3(p4,p3,p2,p1);}
    1.42    Bezier3 operator()(double a,double b) { return before(b).after(a/b); }
    1.43 -  
    1.44 +  Bezier2 grad() { return Bezier2(3.0*(p2-p1),3.0*(p3-p2),3.0*(p4-p3)); }
    1.45 +  xy grad(double t) { return grad()(t); }
    1.46  };
    1.47  
    1.48  } //END OF NAMESPACE LEMON