src/object/particlesystem.cpp

   1 //  $Id$
   2 //
   3 //  SuperTux
   4 //  Copyright (C) 2006 Matthias Braun <matze@braunis.de>
   5 //
   6 //  This program is free software; you can redistribute it and/or
   7 //  modify it under the terms of the GNU General Public License
   8 //  as published by the Free Software Foundation; either version 2
   9 //  of the License, or (at your option) any later version.
  10 //
  11 //  This program is distributed in the hope that it will be useful,
  12 //  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 //  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 //  GNU General Public License for more details.
  15 //
  16 //  You should have received a copy of the GNU General Public License
  17 //  along with this program; if not, write to the Free Software
  18 //  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  19
  20 #include <config.h>
  21
  22 #include <iostream>
  23 #include <cmath>
  24
  25 #include "particlesystem.hpp"
  26 #include "video/drawing_context.hpp"
  27 #include "lisp/parser.hpp"
  28 #include "lisp/lisp.hpp"
  29 #include "lisp/writer.hpp"
  30 #include "resources.hpp"
  31 #include "main.hpp"
  32 #include "object/camera.hpp"
  33 #include "random_generator.hpp"
  34
  35 ParticleSystem::ParticleSystem()
  36 {
  37   virtual_width = SCREEN_WIDTH;
  38   virtual_height = SCREEN_HEIGHT;
  39   z_pos = LAYER_BACKGROUND1;
  40 }
  41
  42 ParticleSystem::~ParticleSystem()
  43 {
  44   std::vector<Particle*>::iterator i;
  45   for(i = particles.begin(); i != particles.end(); ++i) {
  46     delete *i;
  47   }
  48 }
  49
  50 void ParticleSystem::draw(DrawingContext& context)
  51 {
  52   float scrollx = context.get_translation().x;
  53   float scrolly = context.get_translation().y;
  54
  55   context.push_transform();
  56   context.set_translation(Vector(0,0));
  57
  58   std::vector<Particle*>::iterator i;
  59   for(i = particles.begin(); i != particles.end(); ++i) {
  60     Particle* particle = *i;
  61
  62     // remap x,y coordinates onto screencoordinates
  63     Vector pos;
  64     pos.x = fmodf(particle->pos.x - scrollx, virtual_width);
  65     if(pos.x < 0) pos.x += virtual_width;
  66     pos.y = fmodf(particle->pos.y - scrolly, virtual_height);
  67     if(pos.y < 0) pos.y += virtual_height;
  68
  69     if(pos.x > SCREEN_WIDTH) pos.x -= virtual_width;
  70     if(pos.y > SCREEN_HEIGHT) pos.y -= virtual_height;
  71     context.draw_surface(particle->texture, pos, z_pos);
  72   }
  73
  74   context.pop_transform();
  75 }
  76
  77 SnowParticleSystem::SnowParticleSystem()
  78 {
  79   snowimages[0] = new Surface("images/objects/particles/snow0.png");
  80   snowimages[1] = new Surface("images/objects/particles/snow1.png");
  81   snowimages[2] = new Surface("images/objects/particles/snow2.png");
  82
  83   virtual_width = SCREEN_WIDTH * 2;
  84
  85   // create some random snowflakes
  86   size_t snowflakecount = size_t(virtual_width/10.0);
  87   for(size_t i=0; i<snowflakecount; ++i) {
  88     SnowParticle* particle = new SnowParticle;
  89     particle->pos.x = systemRandom.randf(virtual_width);
  90     particle->pos.y = systemRandom.randf(SCREEN_HEIGHT);
  91     int snowsize = systemRandom.rand(3);
  92     particle->texture = snowimages[snowsize];
  93     do {
  94       particle->speed = snowsize*.2 + systemRandom.randf(3.6);
  95     } while(particle->speed < 1);
  96     particle->speed *= 10; // gravity
  97
  98     particles.push_back(particle);
  99   }
 100 }
 101
 102 void
 103 SnowParticleSystem::parse(const lisp::Lisp& reader)
 104 {
 105   reader.get("z-pos", z_pos);
 106 }
 107
 108 void
 109 SnowParticleSystem::write(lisp::Writer& writer)
 110 {
 111   writer.start_list("particles-snow");
 112   writer.write_int("z-pos", z_pos);
 113   writer.end_list("particles-snow");
 114 }
 115
 116 SnowParticleSystem::~SnowParticleSystem()
 117 {
 118   for(int i=0;i<3;++i)
 119     delete snowimages[i];
 120 }
 121
 122 void SnowParticleSystem::update(float elapsed_time)
 123 {
 124   std::vector<Particle*>::iterator i;
 125   for(i = particles.begin(); i != particles.end(); ++i) {
 126     SnowParticle* particle = (SnowParticle*) *i;
 127     particle->pos.y += particle->speed * elapsed_time;
 128     if(particle->pos.y > SCREEN_HEIGHT + Sector::current()->camera->get_translation().y) {
 129       particle->pos.y = fmodf(particle->pos.y , virtual_height);
 130       particle->pos.x = systemRandom.rand((int)virtual_width);
 131     }
 132   }
 133 }
 134
 135 //FIXME: Sometimes both ghosts have the same image
 136 //       Ghosts don't change their movement pattern - not random
 137 GhostParticleSystem::GhostParticleSystem()
 138 {
 139   ghosts[0] = new Surface("images/objects/particles/ghost0.png");
 140   ghosts[1] = new Surface("images/objects/particles/ghost1.png");
 141
 142   virtual_width = SCREEN_WIDTH * 2;
 143
 144   // create two ghosts
 145   size_t ghostcount = 2;
 146   for(size_t i=0; i<ghostcount; ++i) {
 147     GhostParticle* particle = new GhostParticle;
 148     particle->pos.x = systemRandom.randf(virtual_width);
 149     particle->pos.y = systemRandom.randf(SCREEN_HEIGHT);
 150     int size = systemRandom.rand(2);
 151     particle->texture = ghosts[size];
 152     do {
 153       particle->speed = size*.2 + systemRandom.randf(3.6);
 154     } while(particle->speed < 1);
 155     particle->speed *= 50;
 156     particles.push_back(particle);
 157   }
 158 }
 159
 160 void
 161 GhostParticleSystem::parse(const lisp::Lisp& reader)
 162 {
 163   reader.get("z-pos", z_pos);
 164 }
 165
 166 void
 167 GhostParticleSystem::write(lisp::Writer& writer)
 168 {
 169   writer.start_list("particles-ghosts");
 170   writer.write_int("z-pos", z_pos);
 171   writer.end_list("particles-ghosts");
 172 }
 173
 174 GhostParticleSystem::~GhostParticleSystem()
 175 {
 176   for(int i=0;i<2;++i)
 177     delete ghosts[i];
 178 }
 179
 180 void GhostParticleSystem::update(float elapsed_time)
 181 {
 182   std::vector<Particle*>::iterator i;
 183   for(i = particles.begin(); i != particles.end(); ++i) {
 184     GhostParticle* particle = (GhostParticle*) *i;
 185     particle->pos.y -= particle->speed * elapsed_time;
 186     particle->pos.x -= particle->speed * elapsed_time;
 187     if(particle->pos.y > SCREEN_HEIGHT) {
 188       particle->pos.y = fmodf(particle->pos.y , virtual_height);
 189       particle->pos.x = systemRandom.rand((int)virtual_width);
 190     }
 191   }
 192 }
 193
 194 CloudParticleSystem::CloudParticleSystem()
 195 {
 196   cloudimage = new Surface("images/objects/particles/cloud.png");
 197
 198   virtual_width = 2000.0;
 199
 200   // create some random clouds
 201   for(size_t i=0; i<15; ++i) {
 202     CloudParticle* particle = new CloudParticle;
 203     particle->pos.x = systemRandom.rand((int)virtual_width);
 204     particle->pos.y = systemRandom.rand((int)virtual_height);
 205     particle->texture = cloudimage;
 206     particle->speed = -systemRandom.randf(25, 54);
 207
 208     particles.push_back(particle);
 209   }
 210 }
 211
 212 void
 213 CloudParticleSystem::parse(const lisp::Lisp& reader)
 214 {
 215   reader.get("z-pos", z_pos);
 216 }
 217
 218 void
 219 CloudParticleSystem::write(lisp::Writer& writer)
 220 {
 221   writer.start_list("particles-clouds");
 222   writer.write_int("z-pos", z_pos);
 223   writer.end_list("particles-clouds");
 224 }
 225
 226 CloudParticleSystem::~CloudParticleSystem()
 227 {
 228   delete cloudimage;
 229 }
 230
 231 void CloudParticleSystem::update(float elapsed_time)
 232 {
 233   std::vector<Particle*>::iterator i;
 234   for(i = particles.begin(); i != particles.end(); ++i) {
 235     CloudParticle* particle = (CloudParticle*) *i;
 236     particle->pos.x += particle->speed * elapsed_time;
 237   }
 238 }