From b0a9bcb9e1da6e5192cf37aedcd3b87a4041b911 Mon Sep 17 00:00:00 2001
From: "Johan B. C. Engelen" <jbc.engelen@swissonline.ch>
Date: Mon, 23 Nov 2009 21:15:06 +0000
Subject: update 2geom. needed for extrude lpe

(bzr r8840)
---
 src/2geom/d2.h | 21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

(limited to 'src/2geom/d2.h')

diff --git a/src/2geom/d2.h b/src/2geom/d2.h
index 547d8c658..b2a0f8866 100644
--- a/src/2geom/d2.h
+++ b/src/2geom/d2.h
@@ -99,7 +99,7 @@ class D2{
         std::vector<Coord> x = f[X].valueAndDerivatives(t, n),
                            y = f[Y].valueAndDerivatives(t, n); // always returns a vector of size n+1
         std::vector<Point> res(n+1);
-        for (unsigned i = 0; i <= n; i++) {
+        for(unsigned i = 0; i <= n; i++) {
             res[i] = Point(x[i], y[i]);
         }
         return res;
@@ -321,6 +321,25 @@ dot(D2<T> const & a, D2<T> const & b) {
     return r;
 }
 
+/** @brief Calculates the 'dot product' or 'inner product' of \c a and \c b
+ * @return \f$a \bullet b = a_X b_X + a_Y b_Y\f$.
+ * @relates D2 */
+template <typename T>
+inline T
+dot(D2<T> const & a, Point const & b) {
+    boost::function_requires<AddableConcept<T> >();
+    boost::function_requires<ScalableConcept<T> >();
+
+    T r;
+    for(unsigned i = 0; i < 2; i++) {
+        r += a[i] * b[i];
+    }
+    return r;
+}
+
+/** @brief Calculates the 'cross product' or 'outer product' of \c a and \c b
+ * @return \f$a \times b = a_Y b_X - a_X b_Y\f$.
+ * @relates D2 */
 template <typename T>
 inline T
 cross(D2<T> const & a, D2<T> const & b) {
-- 
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