Added traffic lines arrows

src/common/linec.h

@@ -0,0 +1,25 @@
+#ifndef LINEC_H
+#define LINEC_H
+
+#include "coordinates.h"
+
+class LineC
+{
+public:
+	LineC(const Coordinates &c1, const Coordinates &c2) : _c1(c1), _c2(c2) {}
+
+	const Coordinates &c1() const {return _c1;}
+	const Coordinates &c2() const {return _c2;}
+
+	Coordinates pointAt(double t) const
+	{
+		return Coordinates(
+		  _c1.lon() + (_c2.lon() - _c1.lon()) * t,
+		  _c1.lat() + (_c2.lat() - _c1.lat()) * t);
+	}
+
+private:
+	Coordinates _c1, _c2;
+};
+
+#endif // LINEC_H