src/object/particlesystem.cpp

   1 //  SuperTux
   2 //  Copyright (C) 2006 Matthias Braun <matze@braunis.de>
   3 //
   4 //  This program is free software: you can redistribute it and/or modify
   5 //  it under the terms of the GNU General Public License as published by
   6 //  the Free Software Foundation, either version 3 of the License, or
   7 //  (at your option) any later version.
   8 //
   9 //  This program is distributed in the hope that it will be useful,
  10 //  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 //  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 //  GNU General Public License for more details.
  13 //
  14 //  You should have received a copy of the GNU General Public License
  15 //  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16
  17 #include "object/particlesystem.hpp"
  18
  19 #include <cmath>
  20
  21 #include "math/random_generator.hpp"
  22 #include "supertux/main.hpp"
  23 #include "video/drawing_context.hpp"
  24
  25 ParticleSystem::ParticleSystem(float max_particle_size) :
  26   max_particle_size(max_particle_size),
  27   z_pos(),
  28   particles(),
  29   virtual_width(),
  30   virtual_height()
  31 {
  32   virtual_width = SCREEN_WIDTH + max_particle_size * 2;
  33   virtual_height = SCREEN_HEIGHT + max_particle_size *2;
  34   z_pos = LAYER_BACKGROUND1;
  35 }
  36
  37 ParticleSystem::~ParticleSystem()
  38 {
  39   std::vector<Particle*>::iterator i;
  40   for(i = particles.begin(); i != particles.end(); ++i) {
  41     delete *i;
  42   }
  43 }
  44
  45 void ParticleSystem::draw(DrawingContext& context)
  46 {
  47   float scrollx = context.get_translation().x;
  48   float scrolly = context.get_translation().y;
  49
  50   context.push_transform();
  51   context.set_translation(Vector(max_particle_size,max_particle_size));
  52
  53   std::vector<Particle*>::iterator i;
  54   for(i = particles.begin(); i != particles.end(); ++i) {
  55     Particle* particle = *i;
  56
  57     // remap x,y coordinates onto screencoordinates
  58     Vector pos;
  59
  60     pos.x = fmodf(particle->pos.x - scrollx, virtual_width);
  61     if(pos.x < 0) pos.x += virtual_width;
  62
  63     pos.y = fmodf(particle->pos.y - scrolly, virtual_height);
  64     if(pos.y < 0) pos.y += virtual_height;
  65
  66     //if(pos.x > virtual_width) pos.x -= virtual_width;
  67     //if(pos.y > virtual_height) pos.y -= virtual_height;
  68
  69     context.draw_surface(particle->texture, pos, z_pos);
  70   }
  71
  72   context.pop_transform();
  73 }
  74
  75 SnowParticleSystem::SnowParticleSystem()
  76 {
  77   snowimages[0] = new Surface("images/objects/particles/snow2.png");
  78   snowimages[1] = new Surface("images/objects/particles/snow1.png");
  79   snowimages[2] = new Surface("images/objects/particles/snow0.png");
  80
  81   virtual_width = SCREEN_WIDTH * 2;
  82
  83   // create some random snowflakes
  84   size_t snowflakecount = size_t(virtual_width/10.0);
  85   for(size_t i=0; i<snowflakecount; ++i) {
  86     SnowParticle* particle = new SnowParticle;
  87     int snowsize = systemRandom.rand(3);
  88
  89     particle->pos.x = systemRandom.randf(virtual_width);
  90     particle->pos.y = systemRandom.randf(SCREEN_HEIGHT);
  91     particle->anchorx = particle->pos.x + (systemRandom.randf(-0.5, 0.5) * 16);
  92     particle->drift_speed = systemRandom.randf(-0.5, 0.5) * 0.3;
  93     particle->wobble = 0.0;
  94
  95     particle->texture = snowimages[snowsize];
  96
  97     particle->speed = 1 + (2 - snowsize)/2 + systemRandom.randf(1.8);
  98     particle->speed *= 20; // gravity
  99
 100     particles.push_back(particle);
 101   }
 102 }
 103
 104 void
 105 SnowParticleSystem::parse(const Reader& reader)
 106 {
 107   reader.get("z-pos", z_pos);
 108 }
 109
 110 SnowParticleSystem::~SnowParticleSystem()
 111 {
 112   for(int i=0;i<3;++i)
 113     delete snowimages[i];
 114 }
 115
 116 void SnowParticleSystem::update(float elapsed_time)
 117 {
 118   std::vector<Particle*>::iterator i;
 119
 120   for(i = particles.begin(); i != particles.end(); ++i) {
 121     SnowParticle* particle = (SnowParticle*) *i;
 122     float anchor_delta;
 123
 124     particle->pos.y += particle->speed * elapsed_time;
 125     particle->pos.x += particle->wobble * elapsed_time /* * particle->speed * 0.125*/;
 126
 127     anchor_delta = (particle->anchorx - particle->pos.x);
 128     particle->wobble += (4 * anchor_delta * 0.05) + systemRandom.randf(-0.5, 0.5);
 129     particle->wobble *= 0.99f;
 130     particle->anchorx += particle->drift_speed * elapsed_time;
 131   }
 132 }
 133
 134 //FIXME: Sometimes both ghosts have the same image
 135 //       Ghosts don't change their movement pattern - not random
 136 GhostParticleSystem::GhostParticleSystem()
 137 {
 138   ghosts[0] = new Surface("images/objects/particles/ghost0.png");
 139   ghosts[1] = new Surface("images/objects/particles/ghost1.png");
 140
 141   virtual_width = SCREEN_WIDTH * 2;
 142
 143   // create two ghosts
 144   size_t ghostcount = 2;
 145   for(size_t i=0; i<ghostcount; ++i) {
 146     GhostParticle* particle = new GhostParticle;
 147     particle->pos.x = systemRandom.randf(virtual_width);
 148     particle->pos.y = systemRandom.randf(SCREEN_HEIGHT);
 149     int size = systemRandom.rand(2);
 150     particle->texture = ghosts[size];
 151     particle->speed = systemRandom.randf(std::max(50, (size * 10)), 180 + (size * 10));
 152     particles.push_back(particle);
 153   }
 154 }
 155
 156 void
 157 GhostParticleSystem::parse(const Reader& reader)
 158 {
 159   reader.get("z-pos", z_pos);
 160 }
 161
 162 GhostParticleSystem::~GhostParticleSystem()
 163 {
 164   for(int i=0;i<2;++i)
 165     delete ghosts[i];
 166 }
 167
 168 void GhostParticleSystem::update(float elapsed_time)
 169 {
 170   std::vector<Particle*>::iterator i;
 171   for(i = particles.begin(); i != particles.end(); ++i) {
 172     GhostParticle* particle = (GhostParticle*) *i;
 173     particle->pos.y -= particle->speed * elapsed_time;
 174     particle->pos.x -= particle->speed * elapsed_time;
 175     if(particle->pos.y > SCREEN_HEIGHT) {
 176       particle->pos.y = fmodf(particle->pos.y , virtual_height);
 177       particle->pos.x = systemRandom.rand(static_cast<int>(virtual_width));
 178     }
 179   }
 180 }
 181
 182 CloudParticleSystem::CloudParticleSystem() :
 183   ParticleSystem(128),
 184   cloudimage()
 185 {
 186   cloudimage = new Surface("images/objects/particles/cloud.png");
 187
 188   virtual_width = 2000.0;
 189
 190   // create some random clouds
 191   for(size_t i=0; i<15; ++i) {
 192     CloudParticle* particle = new CloudParticle;
 193     particle->pos.x = systemRandom.rand(static_cast<int>(virtual_width));
 194     particle->pos.y = systemRandom.rand(static_cast<int>(virtual_height));
 195     particle->texture = cloudimage;
 196     particle->speed = -systemRandom.randf(25.0, 54.0);
 197
 198     particles.push_back(particle);
 199   }
 200 }
 201
 202 void
 203 CloudParticleSystem::parse(const Reader& reader)
 204 {
 205   reader.get("z-pos", z_pos);
 206 }
 207
 208 CloudParticleSystem::~CloudParticleSystem()
 209 {
 210   delete cloudimage;
 211 }
 212
 213 void CloudParticleSystem::update(float elapsed_time)
 214 {
 215   std::vector<Particle*>::iterator i;
 216   for(i = particles.begin(); i != particles.end(); ++i) {
 217     CloudParticle* particle = (CloudParticle*) *i;
 218     particle->pos.x += particle->speed * elapsed_time;
 219   }
 220 }
 221
 222 /* EOF */