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- /*
- * Copyright (C) 2017 Christopher J. Howard
- *
- * This file is part of Antkeeper Source Code.
- *
- * Antkeeper Source Code is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * Antkeeper Source Code is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Antkeeper Source Code. If not, see <http://www.gnu.org/licenses/>.
- */
-
- #include "pheromone.hpp"
- #include <cmath>
-
- void Pheromone::setStrength(float strength)
- {
- this->strength = strength;
-
- // Calculate approximate radius
- const float minimumStrength = 0.01f; // Pheromone strength epsilon
- const float quadraticAttenuation = 1.0f; // Quadratic attenuation factor (1.0 = inverse-square falloff)
-
- radiusSquared = strength / (quadraticAttenuation * minimumStrength);
- radius = std::sqrt(radiusSquared);
- }
-
- float Pheromone::getAttenuatedStrength(const Vector3& position) const
- {
- Vector3 difference = this->position - position;
-
- float distanceSquared = glm::dot(difference, difference);
-
- if (distanceSquared == 0.0f)
- {
- return strength;
- }
-
- const float minimumStrength = 0.01f; // Pheromone strength epsilon
- const float quadraticAttenuation = 1.0f; // Quadratic attenuation factor (1.0 = inverse-square falloff)
-
- return strength / (1.0f + quadraticAttenuation * distanceSquared);
- }
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