From 4289e1281e707090b4195dcb879cf1532d9ef03a Mon Sep 17 00:00:00 2001
From: "Johan B. C. Engelen" <jbc.engelen@swissonline.ch>
Date: Sat, 14 Jun 2008 15:01:19 +0000
Subject: update 2geom

(bzr r5931)
---
 src/2geom/piecewise.cpp | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

(limited to 'src/2geom/piecewise.cpp')

diff --git a/src/2geom/piecewise.cpp b/src/2geom/piecewise.cpp
index dc91ab4a9..222152aa3 100644
--- a/src/2geom/piecewise.cpp
+++ b/src/2geom/piecewise.cpp
@@ -167,6 +167,22 @@ std::vector<double> roots(Piecewise<SBasis> const &f){
     return result;
 }
 
+Piecewise<SBasis> reverse(Piecewise<SBasis> const &f) {
+    Piecewise<SBasis> ret = Piecewise<SBasis>();
+    ret.cuts.resize(f.cuts.size());
+    ret.segs.resize(f.segs.size());
+    double start = f.cuts[0];
+    double end = f.cuts.back();
+    for (unsigned i = 0; i < f.cuts.size(); i++) {
+        double x = f.cuts[f.cuts.size() - 1 - i];
+        ret.cuts[i] = end - (x - start);
+    }
+    for (unsigned i = 0; i < f.segs.size(); i++)
+        ret.segs[i] = reverse(f[f.segs.size() - i - 1]);
+    return ret;
+}
+
+
 }
 /*
   Local Variables:
-- 
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