| //##################################################################### |
| // Copyright 2004, Ron Fedkiw, Andrew Selle. |
| // This file is part of PhysBAM whose distribution is governed by the license contained in the accompanying file PHYSBAM_COPYRIGHT.txt. |
| //##################################################################### |
| // Class PARTICLE_VELOCITY_ATTRIBUTE |
| //##################################################################### |
| #ifndef __PARTICLE_VELOCITY_ATTRIBUTE__ |
| #define __PARTICLE_VELOCITY_ATTRIBUTE__ |
| |
| #include "PARTICLE_ATTRIBUTE.h" |
| namespace PhysBAM |
| { |
| |
| template<class T, class TV> |
| class PARTICLE_VELOCITY_ATTRIBUTE: public PARTICLE_ATTRIBUTE<TV> |
| { |
| public: |
| using PARTICLE_ATTRIBUTE<TV>::array; |
| |
| PARTICLE_VELOCITY_ATTRIBUTE() |
| {} |
| |
| void Euler_Step (const PARTICLE& particle, const ARRAY<TV>& A, const T dt) |
| { |
| ARRAY<TV>& V = array; |
| |
| for (int k = 1; k <= particle.number; k++) V (k) += dt * A (k); |
| } |
| |
| void Euler_Step (const PARTICLE& particle, const ARRAY<TV>& F, const ARRAY<T>& mass, const T dt) |
| { |
| ARRAY<TV>& V = array; |
| |
| for (int k = 1; k <= particle.number; k++) V (k) += dt / mass (k) * F (k); |
| } |
| |
| T Maximum_Speed (const PARTICLE& particle, int* index = 0) const |
| { |
| const ARRAY<TV>& V = array; |
| T max_speed_sqr = 0; |
| int max_speed_index = 0; |
| |
| for (int k = 1; k <= particle.number; k++) |
| { |
| T speed_sqr = V (k).Magnitude_Squared(); |
| |
| if (speed_sqr > max_speed_sqr) |
| { |
| max_speed_sqr = speed_sqr; |
| max_speed_index = k; |
| } |
| } |
| |
| if (index) *index = max_speed_index; |
| |
| return sqrt (max_speed_sqr); |
| } |
| |
| //##################################################################### |
| }; |
| } |
| #endif |
