First round of dead file removal

experimental/flocking_geese/nacl_app/goose.h

-// Copyright (c) 2011 The Native Client Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef GOOSE_H_
-#define GOOSE_H_
-
-#include <vector>
-#include "nacl_app/vector2.h"
-#include "ppapi/cpp/rect.h"
-
-namespace flocking_geese {
-
-// A Goose.  Each goose has a location and a velocity.  Implements the
-// flocking algortihm described here:
-// http://processingjs.org/learning/topic/flocking with references to
-// http://harry.me/2011/02/17/neat-algorithms---flocking.
-class Goose {
- public:
-  // Initialize a Goose at location (0, 0) with random velocity.
-  Goose();
-  // Initialize a Goose at the given location with random velocity.
-  explicit Goose(const Vector2& location);
-  ~Goose() {}
-
-  // Run one tick of the simulation.  Compute a new acceleration based on the
-  // flocking algorithm (see Goose.flock()) and update the goose's location
-  // by integrating acceleration and velocity.
-  // @param geese The list of all the geese in the flock.
-  // @param  attractors The list of attractors.  Geese have affinity for these
-  //     points.
-  // @param flockBox The geese will stay inside of this box.  If the parameter
-  //     is not given, the geese don't have boundaries.
-  void SimulationTick(const std::vector<Goose>& geese,
-                      const std::vector<Vector2>& attractors,
-                      const pp::Rect& flockBox);
-
-  // Implement the flocking algorithm in five steps:
-  //  1. Compute the separation component,
-  //  2. Compute the alignment component,
-  //  3. Compute the cohesion component.
-  //  4. Compute the effect of the attractors and blend this in with the
-  //     cohesion component.
-  //  5. Create a weighted sum of the three components and use this as the
-  //     new acceleration for the goose.
-  // This is an O(n^2) version of the algorithm.  There are ways to speed this
-  // up using spatial coherence techniques, but this version is much simpler.
-  // @param geese The list of all the neighbouring geese (in this
-  //     implementation, this is all the geese in the flock).
-  // @param  attractors The list of attractors.  Geese have affinity for these
-  //     points.
-  // @return The acceleration vector for this goose based on the flocking
-  //     algorithm.
-  Vector2 Flock(const std::vector<Goose>& geese,
-                const std::vector<Vector2>& attractors);
-
-  // Turn the goose towards a target.  The amount of turning force is clamped
-  // to |kMaxTurningForce|.
-  // @param target Turn the goose towards this target.
-  // @return A vector representing the new direction of the goose.
-  Vector2 TurnTowardsTarget(const Vector2& target);
-
-  // Accessors for location and velocoity.
-  Vector2 location() const {
-    return location_;
-  }
-  Vector2 velocity() const {
-    return velocity_;
-  }
-
- private:
-  // Add a neighbouring goose's contribution to the separation mean.  Only
-  // consider geese that have moved inside of this goose's personal space.
-  // Modifies the separation accumulator |separation| in-place.
-  // @param distance The distance from this goose to the neighbouring goose.
-  // @param gooseDirection The direction vector from this goose to the
-  //     neighbour.
-  // @param separation The accumulated separation from all the neighbouring
-  //     geese.
-  // @param separationCount The current number of geese that have contributed to
-  //     the separation component so far.
-  // @return The new count of geese that contribute to the separation component.
-  //     If the goose under consideration does not contribute, this value is the
-  //     same as |separationCount|.
-  int32_t AccumulateSeparation(double distance,
-                               const Vector2& gooseDirection,
-                               Vector2* separation, /* inout */
-                               int32_t separationCount);
-
-  // Add a neighbouring goose's contribution to the alignment mean.  Alignment
-  // is the average velocity of the neighbours. Only consider geese that are
-  // within |kNeighbourRadius|.  Modifies the alignment accumulator |alignment|
-  // in-place.
-  // @param distance The distance from this goose to the neighbouring goose.
-  // @param goose The neighbouring goose under consideration.
-  // @param alignment The accumulated alignment from all the neighbouring geese.
-  // @param alignCount The current number of geese that have contributed to the
-  //     alignment component so far.
-  // @return The new count of geese that contribute to the alignment component.
-  // If the goose under consideration does not contribute, this value is the
-  //     same as |alignCount|.
-  int32_t AccumulateAlignment(double distance,
-                              const Goose& goose,
-                              Vector2* alignment, /* inout */
-                              int32_t alignCount);
-
-  // Add a neighbouring goose's contribution to the cohesion mean.  Cohesion is
-  // based on the average location of the neighbours.  The goose attempts to
-  // point to this average location.  Only consider geese that are within
-  // |kNeighbourRadius|.  Modifies the cohesion accumulator |cohesion| in-place.
-  // @param {!number} distance The distance from this goose to the neighbouring
-  //     goose.
-  // @param {!Goose} goose The neighbouring goose under consideration.
-  // @param {!goog.math.Vec2} cohesion The accumulated cohesion from all the
-  //     neighbouring geese.
-  // @param {!number} cohesionCount The current number of geese that have
-  //     contributed to the cohesion component so far.
-  // @return {!number} The new count of geese that contribute to the cohesion
-  //     component.  If the goose under consideration does not contribute, this
-  //     value is the same as |cohesionCount|.
-  int32_t AccumulateCohesion(double distance,
-                             const Goose& goose,
-                             Vector2* cohesion, /* inout */
-                             int32_t cohesionCount);
-
-  Vector2 location_;
-  Vector2 velocity_;
-};
-
-}  // namespace flocking_geese
-
-#endif  // GOOSE_H_