added LineTrajectory

Framework/Geometry/Helix.h

@@ -19,8 +19,8 @@ class Helix // TODO: inherit from to-be-implemented "Trajectory"
     Length const radius;
     
 public:
-    Helix(Point const pR0, phys::units::quantity<phys::units::frequency_d> pOmegaC,
-        SpeedVec const pvPar, SpeedVec const pvPerp) :
+    Helix(Point const& pR0, phys::units::quantity<phys::units::frequency_d> pOmegaC,
+        SpeedVec const& pvPar, SpeedVec const& pvPerp) :
         r0(pR0), omegaC(pOmegaC), vPar(pvPar), vPerp(pvPerp), uPerp(vPerp.cross(vPar.normalized())),
         radius(pvPar.norm() / abs(pOmegaC))
     {

Framework/Geometry/LineTrajectory.h

+#ifndef _include_LINETRAJECTORY_H
+#define _include_LINETRAJECTORY_H
+
+#include <Framework/Geometry/Point.h>
+#include <Framework/Geometry/Vector.h>
+#include <Units/PhysicalUnits.h>
+
+class LineTrajectory // TODO: inherit from Trajectory
+{
+    using SpeedVec = Vector<Speed::dimension_type>;
+    
+    Point const r0;
+    SpeedVec const v0;
+    
+    LineTrajectory(Point const& pR0, SpeedVec const& pV0) :
+        r0(r0), v0(pV0)
+    {
+    }
+    
+    auto getPosition(Time t) const
+    {
+        return r0 + v0 * t;
+    }
+};
+
+#endif