From bacf092e612ad1911c5a4db58261865e54953b34 Mon Sep 17 00:00:00 2001
From: johanengelen <johanengelen@users.sourceforge.net>
Date: Sun, 23 Dec 2007 21:17:42 +0000
Subject: [PATCH] update to latest 2geom, bugs be gone!

---
 src/2geom/bezier.h   |  6 ++++++
 src/2geom/concepts.h |  1 +
 src/2geom/d2.h       |  4 ++++
 src/2geom/linear.h   |  1 +
 src/2geom/path.h     | 12 ++++++++++--
 src/2geom/sbasis.h   |  8 ++++++++
 6 files changed, 30 insertions(+), 2 deletions(-)

diff --git a/src/2geom/bezier.h b/src/2geom/bezier.h
index 16b4d7446..bdc672a57 100644
--- a/src/2geom/bezier.h
+++ b/src/2geom/bezier.h
@@ -136,6 +136,12 @@ public:
         }
         return true;
     }
+    inline bool isConstant() const {
+        for(unsigned i = 1; i <= order(); i++) {
+            if(c_[i] != c_[0]) return false;
+        }
+        return true;
+    }
     inline bool isFinite() const {
         for(unsigned i = 0; i <= order(); i++) {
             if(!is_finite(c_[i])) return false;
diff --git a/src/2geom/concepts.h b/src/2geom/concepts.h
index 92ec66c7f..50cef4e4b 100644
--- a/src/2geom/concepts.h
+++ b/src/2geom/concepts.h
@@ -72,6 +72,7 @@ struct FragmentConcept {
     void constraints() {
         t = T(o);
         b = t.isZero();
+        b = t.isConstant();
         b = t.isFinite();
         o = t.at0();
         o = t.at1();
diff --git a/src/2geom/d2.h b/src/2geom/d2.h
index 47355eb60..3becc813d 100644
--- a/src/2geom/d2.h
+++ b/src/2geom/d2.h
@@ -68,6 +68,10 @@ class D2{
         boost::function_requires<FragmentConcept<T> >();
         return f[X].isZero() && f[Y].isZero();
     }
+    bool isConstant() const {
+        boost::function_requires<FragmentConcept<T> >();
+        return f[X].isConstant() && f[Y].isConstant();
+    }
     bool isFinite() const {
         boost::function_requires<FragmentConcept<T> >();
         return f[X].isFinite() && f[Y].isFinite();
diff --git a/src/2geom/linear.h b/src/2geom/linear.h
index 2b346468c..32716b9d1 100644
--- a/src/2geom/linear.h
+++ b/src/2geom/linear.h
@@ -87,6 +87,7 @@ public:
     //IMPL: FragmentConcept
     typedef double output_type;
     inline bool isZero() const { return a[0] == 0 && a[1] == 0; }
+    inline bool isConstant() const { return a[0] == a[1]; }
     inline bool isFinite() const { return is_finite(a[0]) && is_finite(a[1]); }
 
     inline double at0() const { return a[0]; }
diff --git a/src/2geom/path.h b/src/2geom/path.h
index 3c536c1d8..72c5d50fa 100644
--- a/src/2geom/path.h
+++ b/src/2geom/path.h
@@ -56,6 +56,8 @@ public:
   virtual Point initialPoint() const = 0;
   virtual Point finalPoint() const = 0;
 
+  virtual bool isDegenerate() const = 0;
+
   virtual Curve *duplicate() const = 0;
 
   virtual Rect boundsFast() const = 0;
@@ -94,6 +96,7 @@ public:
 
   Point initialPoint() const    { return inner.at0(); }
   Point finalPoint() const      { return inner.at1(); }
+  bool isDegenerate() const     { return inner.isConstant(); }
   Point pointAt(Coord t) const  { return inner.valueAt(t); }
   std::vector<Point> pointAndDerivatives(Coord t, unsigned n) const {
       return inner.valueAndDerivatives(t, n);
@@ -168,6 +171,8 @@ public:
   Point initialPoint() const { return inner.at0(); }
   Point finalPoint() const { return inner.at1(); }
 
+  bool isDegenerate() const { return inner.isConstant(); }
+
   void setInitial(Point v) { setPoint(0, v); }
   void setFinal(Point v)   { setPoint(1, v); }
 
@@ -284,6 +289,7 @@ public:
 
   //TODO: implement funcs
 
+  bool isDegenerate() const { return toSBasis().isConstant(); }
   Rect boundsFast() const;
   Rect boundsExact() const;
   Rect boundsLocal(Interval i, unsigned deg) const;
@@ -493,8 +499,10 @@ public:
     ret.push_cut(0);
     unsigned i = 1;
     // ignore that path is closed or open. pw<d2<>> is always open.
-    for(const_iterator it = begin(); it != end(); ++it, i++) {
-      ret.push(it->toSBasis(), i);
+    for(const_iterator it = begin(); it != end(); ++it) {
+      if (!it->isDegenerate()) {
+        ret.push(it->toSBasis(), i++);
+      }
     }
     return ret;
   }
diff --git a/src/2geom/sbasis.h b/src/2geom/sbasis.h
index acaa190a6..c7489e27d 100644
--- a/src/2geom/sbasis.h
+++ b/src/2geom/sbasis.h
@@ -67,6 +67,14 @@ public:
         }
         return true;
     }
+    inline bool isConstant() const {
+        if (empty()) return true;
+        for (unsigned i = 0; i < size(); i++) {
+            if(!(*this)[i].isConstant()) return false;
+        }
+        return true;
+    }
+
     bool isFinite() const;
     inline double at0() const { 
         if(empty()) return 0; else return (*this)[0][0];
-- 
2.30.2