Changeset 1084:320a0f083ca1 in lemon-0.x

Timestamp:

01/16/05 23:31:26 (20 years ago)

Author:

Alpar Juttner

Branch:

default

Phase:

public

Convert:

svn:c9d7d8f5-90d6-0310-b91f-818b3a526b0e/lemon/trunk@1480

Message:

Functions added to compute the gradient of Bezier curve.

File:

• src/lemon/bezier.h (modified) (4 diffs)

src/lemon/bezier.h

@@ -22 +22 @@
 ///\brief Classes to compute with Bezier curves.
 ///
-///Up to now this file is internally used by \ref graph_to_eps.h
+///Up to now this file is used internally by \ref graph_to_eps.h
 ///
 ///\author Alpar Juttner
@@ -59 +59 @@
     return Bezier1(conv(p1,p2,t),p2);
   }
-  Bezier1 operator()(double a,double b) { return before(b).after(a/b); }  
+  Bezier1 revert() { return Bezier1(p2,p1);}
+  Bezier1 operator()(double a,double b) { return before(b).after(a/b); }
+  xy grad() { return p2-p1; }
+  xy grad(double t) { return grad(); }
+
 };
 
@@ -88 +92 @@
     return Bezier2(conv(q,r,t),r,p3);
   }
+  Bezier2 revert() { return Bezier2(p3,p2,p1);}
   Bezier2 operator()(double a,double b) { return before(b).after(a/b); }
-  
+  Bezier1 grad() { return Bezier1(2.0*(p2-p1),2.0*(p3-p2)); }
+  xy grad(double t) { return grad()(t); }  
 };
 
@@ -131 +137 @@
       return Bezier3(c,b,r,p4);
     }
+  Bezier3 revert() { return Bezier3(p4,p3,p2,p1);}
   Bezier3 operator()(double a,double b) { return before(b).after(a/b); }
-  
+  Bezier2 grad() { return Bezier2(3.0*(p2-p1),3.0*(p3-p2),3.0*(p4-p3)); }
+  xy grad(double t) { return grad()(t); }
 };