1 /* 2 * Copyright (C) 2013 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except 5 * in compliance with the License. You may obtain a copy of the License at 6 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 * 9 * Unless required by applicable law or agreed to in writing, software distributed under the License 10 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express 11 * or implied. See the License for the specific language governing permissions and limitations under 12 * the License. 13 */ 14 // An implementation of Craig Reynold's Boid Simulation. 15 #ifndef BOID_H 16 #define BOID_H 17 18 #include <graphics/Vector2D.h> 19 20 class Boid { 21 public: 22 Boid(float x, float y); 23 void resetAcceleration(); 24 void flock(const Boid* boids[], int numBoids, int index, float limitX, float limitY); 25 // The following floats are the parameters for the flocking algorithm, changing these 26 // modifies the boid's behaviour. 27 static const constexpr float MAX_SPEED = 2.0f;// Upper limit of boid velocity. 28 static const constexpr float MAX_FORCE = 0.05f;// Upper limit of the force used to push a boid. 29 static const constexpr float NEIGHBOUR_RADIUS = 70.0f;// Radius used to find neighbours, was 50. 30 static const constexpr float DESIRED_BOID_DIST = 35.0f;// Distance boids want to be from others, was 25. 31 // The weightings of the components. 32 static const constexpr float SEPARATION_WEIGHT = 2.0f; 33 static const constexpr float ALIGNMENT_WEIGHT = 1.0f; 34 static const constexpr float COHESION_WEIGHT = 1.0f; 35 Vector2D mPosition; 36 Vector2D mVelocity; 37 Vector2D mAcceleration; 38 }; 39 #endif 40
