* speed up hop-to-hop calculations

* better and faster trip clustering: trip tries
* add --write-colors to extract line colors from OSM data
* refactor config parameter names, update default pfaedle.cfg
* add --stats for writing a stats.json file
* add --no-fast-hops, --no-a-star, --no-trie for debugging
* general refactoring

src/util/geo/CircularSegment.h

@@ -0,0 +1,41 @@
+// Copyright 2016, University of Freiburg,
+// Chair of Algorithms and Data Structures.
+// Authors: Patrick Brosi <brosi@informatik.uni-freiburg.de>
+
+#ifndef UTIL_GEO_CIRCULARSEGMENT_H_
+#define UTIL_GEO_CIRCULARSEGMENT_H_
+
+#include <vector>
+#include "util/geo/Geo.h"
+#include "util/geo/PolyLine.h"
+
+namespace util {
+namespace geo {
+
+/**
+ * Circular segment
+ */
+template <typename T>
+class CircularSegment {
+ public:
+  CircularSegment(const Point<T>& a, double ang, const Point<T>& c);
+
+  const PolyLine<T>& render(double d);
+
+ private:
+  // store the rendered polyline for quicker access
+  PolyLine<T> _rendered;
+
+  const Point<T>& _a, _c;
+  double _renderD;
+
+  double _ang, _rad, _s, _initAng;
+
+  Point<T> valueAt(double t) const;
+};
+
+#include "util/geo/CircularSegment.tpp"
+}
+}
+
+#endif  // UTIL_GEO_BEZIERCURVE_H_