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