First round of dead file removal

experimental/flocking_geese/nacl_app/vector2.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 VECTOR2_H_
-#define VECTOR2_H_
-
-#include <stdlib.h>
-#include <cmath>
-#include <limits>
-
-// A small class that encapsulates a 2D vector.  PR\rovides a few simple
-// operations.
-
-class Vector2 {
- public:
-  Vector2() : x_(0.0), y_(0.0) {}
-  Vector2(double x, double y) : x_(x), y_(y) {}
-  ~Vector2() {}
-
-  // Create a random vector of unit length.  Works in-place.
-  static Vector2 RandomUnit() {
-    double angle = static_cast<double>(rand()) * M_PI * 2.0 / RAND_MAX;
-    Vector2 rand_vec(cos(angle), sin(angle));
-    return rand_vec;
-  }
-
-  // Create a new vector that represents a - b.
-  static Vector2 Difference(const Vector2& a, const Vector2& b) {
-    Vector2 diff(a.x() - b.x(), a.y() - b.y());
-    return diff;
-  }
-
-  // The magnitude of this vector.
-  double Magnitude() const {
-    return sqrt(x_ * x_ + y_ * y_);
-  }
-
-  // Add |vec| to this vector.  Works in-place.
-  void Add(const Vector2& vec) {
-    x_ += vec.x();
-    y_ += vec.y();
-  }
-
-  // Normalize this vector in-place.  If the vector is degenerate (size 0)
-  // then do nothing.
-  void Normalize() {
-    double mag = Magnitude();
-    if (fabs(mag) < std::numeric_limits<double>::epsilon())
-      return;
-    Scale(1.0 / mag);
-  }
-
-  // Scale the vector in-place by |scale|.
-  void Scale(double scale) {
-    x_ *= scale;
-    y_ *= scale;
-  }
-
-  // Clamp a vector to a maximum magnitude.  Works on the vector in-place.
-  // @param max_mag The maximum magnitude of the vector.
-  void Clamp(double max_mag) {
-    double mag = Magnitude();
-    if (mag > max_mag) {
-      Scale(max_mag / mag);  // Does Normalize() followed by Scale(max_mag).
-    }
-  }
-
-  // Compute the "heading" of a vector - this is the angle in radians between
-  // the vector and the x-axis.
-  // @return {!number} The "heading" angle in radians.
-  double Heading() const {
-    double angle = atan2(y_, x_);
-    return angle;
-  }
-
-  // Accessors and mutators for the coordinate values.
-  double x() const { return x_; }
-  void set_x(double x) { x_ = x; }
-
-  double y() const { return y_; }
-  void set_y(double y) { y_ = y; }
-
- private:
-  double x_;
-  double y_;
-};
-
-#endif  // VECTOR2_H_