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1 /*
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2
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3 Copyright (C) 2015 Fiore Martin
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4 Copyright (C) 2016 Queen Mary University of London
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5 Author: Fiore Martin
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6
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7 This file is part of Collidoscope.
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8
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9 Collidoscope is free software: you can redistribute it and/or modify
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10 it under the terms of the GNU General Public License as published by
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11 the Free Software Foundation, either version 3 of the License, or
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12 (at your option) any later version.
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13
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14 This program is distributed in the hope that it will be useful,
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15 but WITHOUT ANY WARRANTY; without even the implied warranty of
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16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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17 GNU General Public License for more details.
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18
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19 You should have received a copy of the GNU General Public License
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20 along with this program. If not, see <http://www.gnu.org/licenses/>.
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21
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22 */
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23
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24 #pragma once
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25
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26 #include "cinder/gl/gl.h"
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27 #include <vector>
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28
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29 /**
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30 * The ParticleController creates/updates/draws and destroys particles
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31 */
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32 class ParticleController {
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33
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34 struct Particle {
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35
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36 ci::vec2 mCloudCenter; // initial positin of the particle
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37 ci::vec2 mVel; // velocity
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38 float mCloudSize; // how big is the area where particle float around. When a particle hits the
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39 // border of the area it gets deflected
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40
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41 int mAge; // when mAge == mLifeSpan the particle is disposed
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42 int mLifespan; // how long a particle lives
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43 bool mFlyOver; // some particles last longer and fly over the screen and reach the other user
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44
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45 };
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46
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47 static const int kMaxParticles = 150;
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48
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49 std::vector<Particle> mParticles;
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50 std::vector< ci::vec2 > mParticlePositions;
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51
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52 // current number of active particles
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53 size_t mNumParticles;
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54
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55 ci::gl::VboRef mParticleVbo; // virtual buffer object
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56 ci::gl::BatchRef mParticleBatch;
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57
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58 public:
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59 /**
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60 * Every time addParticles is run, up to kMaxParticleAdd are added at once
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61 */
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62 static const int kMaxParticleAdd = 22;
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63
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64 ParticleController();
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65
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66 /**
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67 * Adds \a amount particles and places them in \a initialLocation.
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68 * \cloudSize determines how far the particles can go
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69 */
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70 void addParticles(int amount, const ci::vec2 &initialLocation, const float cloudSize);
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71
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72 /**
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73 * Updates position and age of the particles
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74 */
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75 void updateParticles();
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76
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77 /**
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78 * Draws all the particles
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79 */
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80 inline void draw()
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81 {
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82 mParticleBatch->draw();
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83 }
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84
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85 };
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86
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