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 + MAX_PARTICLE_SIZE * 2;
  38   virtual_height = SCREEN_HEIGHT + MAX_PARTICLE_SIZE *2;
  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(MAX_PARTICLE_SIZE,MAX_PARTICLE_SIZE));
  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
  65     pos.x = fmodf(particle->pos.x - scrollx, virtual_width);
  66     if(pos.x < 0) pos.x += virtual_width;
  67
  68     pos.y = fmodf(particle->pos.y - scrolly, virtual_height);
  69     if(pos.y < 0) pos.y += virtual_height;
  70
  71
  72     //if(pos.x > virtual_width) pos.x -= virtual_width;
  73     //if(pos.y > virtual_height) pos.y -= virtual_height;
  74
  75     context.draw_surface(particle->texture, pos, z_pos);
  76   }
  77
  78   context.pop_transform();
  79 }
  80
  81 SnowParticleSystem::SnowParticleSystem()
  82 {
  83   snowimages[0] = new Surface("images/objects/particles/snow2.png");
  84   snowimages[1] = new Surface("images/objects/particles/snow1.png");
  85   snowimages[2] = new Surface("images/objects/particles/snow0.png");
  86
  87   virtual_width = SCREEN_WIDTH * 2;
  88
  89   // create some random snowflakes
  90   size_t snowflakecount = size_t(virtual_width/10.0);
  91   for(size_t i=0; i<snowflakecount; ++i) {
  92     SnowParticle* particle = new SnowParticle;
  93     particle->pos.x = systemRandom.randf(virtual_width);
  94     particle->pos.y = systemRandom.randf(SCREEN_HEIGHT);
  95     particle->anchorx = particle->pos.x + ((systemRandom.randf(1.0) - 0.5) * 16);
  96     particle->anchordrift = (systemRandom.randf(1.0) - 0.5) * 0.3;
  97     int snowsize = systemRandom.rand(3);
  98     particle->texture = snowimages[snowsize];
  99     do {
 100       particle->speed = snowsize + systemRandom.randf(1.8);
 101     } while(particle->speed < 1);
 102     particle->speed *= 20; // gravity
 103
 104     particles.push_back(particle);
 105   }
 106 }
 107
 108 void
 109 SnowParticleSystem::parse(const lisp::Lisp& reader)
 110 {
 111   reader.get("z-pos", z_pos);
 112 }
 113
 114 void
 115 SnowParticleSystem::write(lisp::Writer& writer)
 116 {
 117   writer.start_list("particles-snow");
 118   writer.write_int("z-pos", z_pos);
 119   writer.end_list("particles-snow");
 120 }
 121
 122 SnowParticleSystem::~SnowParticleSystem()
 123 {
 124   for(int i=0;i<3;++i)
 125     delete snowimages[i];
 126 }
 127
 128 void SnowParticleSystem::update(float elapsed_time)
 129 {
 130   float anchor_delta;
 131   std::vector<Particle*>::iterator i;
 132
 133   for(i = particles.begin(); i != particles.end(); ++i) {
 134     SnowParticle* particle = (SnowParticle*) *i;
 135     particle->pos.y += particle->speed * elapsed_time;
 136     particle->pos.x += particle->wobble * elapsed_time * particle->speed * 0.125;
 137     particle->pos.x = particle->anchorx;
 138     anchor_delta = (particle->anchorx - particle->pos.x);
 139     particle->wobble += (anchor_delta * 0.05) + (systemRandom.randf(1.0) - 0.5);
 140     particle->wobble *= 0.99;
 141     particle->anchorx += particle->anchordrift;
 142
 143   }
 144 }
 145
 146 //FIXME: Sometimes both ghosts have the same image
 147 //       Ghosts don't change their movement pattern - not random
 148 GhostParticleSystem::GhostParticleSystem()
 149 {
 150   ghosts[0] = new Surface("images/objects/particles/ghost0.png");
 151   ghosts[1] = new Surface("images/objects/particles/ghost1.png");
 152
 153   virtual_width = SCREEN_WIDTH * 2;
 154
 155   // create two ghosts
 156   size_t ghostcount = 2;
 157   for(size_t i=0; i<ghostcount; ++i) {
 158     GhostParticle* particle = new GhostParticle;
 159     particle->pos.x = systemRandom.randf(virtual_width);
 160     particle->pos.y = systemRandom.randf(SCREEN_HEIGHT);
 161     int size = systemRandom.rand(2);
 162     particle->texture = ghosts[size];
 163     do {
 164       particle->speed = size*.2 + systemRandom.randf(3.6);
 165     } while(particle->speed < 1);
 166     particle->speed *= 50;
 167     particles.push_back(particle);
 168   }
 169 }
 170
 171 void
 172 GhostParticleSystem::parse(const lisp::Lisp& reader)
 173 {
 174   reader.get("z-pos", z_pos);
 175 }
 176
 177 void
 178 GhostParticleSystem::write(lisp::Writer& writer)
 179 {
 180   writer.start_list("particles-ghosts");
 181   writer.write_int("z-pos", z_pos);
 182   writer.end_list("particles-ghosts");
 183 }
 184
 185 GhostParticleSystem::~GhostParticleSystem()
 186 {
 187   for(int i=0;i<2;++i)
 188     delete ghosts[i];
 189 }
 190
 191 void GhostParticleSystem::update(float elapsed_time)
 192 {
 193   std::vector<Particle*>::iterator i;
 194   for(i = particles.begin(); i != particles.end(); ++i) {
 195     GhostParticle* particle = (GhostParticle*) *i;
 196     particle->pos.y -= particle->speed * elapsed_time;
 197     particle->pos.x -= particle->speed * elapsed_time;
 198     if(particle->pos.y > SCREEN_HEIGHT) {
 199       particle->pos.y = fmodf(particle->pos.y , virtual_height);
 200       particle->pos.x = systemRandom.rand((int)virtual_width);
 201     }
 202   }
 203 }
 204
 205 CloudParticleSystem::CloudParticleSystem()
 206 {
 207   cloudimage = new Surface("images/objects/particles/cloud.png");
 208
 209   virtual_width = 2000.0;
 210
 211   // create some random clouds
 212   for(size_t i=0; i<15; ++i) {
 213     CloudParticle* particle = new CloudParticle;
 214     particle->pos.x = systemRandom.rand((int)virtual_width);
 215     particle->pos.y = systemRandom.rand((int)virtual_height);
 216     particle->texture = cloudimage;
 217     particle->speed = -systemRandom.randf(25, 54);
 218
 219     particles.push_back(particle);
 220   }
 221 }
 222
 223 void
 224 CloudParticleSystem::parse(const lisp::Lisp& reader)
 225 {
 226   reader.get("z-pos", z_pos);
 227 }
 228
 229 void
 230 CloudParticleSystem::write(lisp::Writer& writer)
 231 {
 232   writer.start_list("particles-clouds");
 233   writer.write_int("z-pos", z_pos);
 234   writer.end_list("particles-clouds");
 235 }
 236
 237 CloudParticleSystem::~CloudParticleSystem()
 238 {
 239   delete cloudimage;
 240 }
 241
 242 void CloudParticleSystem::update(float elapsed_time)
 243 {
 244   std::vector<Particle*>::iterator i;
 245   for(i = particles.begin(); i != particles.end(); ++i) {
 246     CloudParticle* particle = (CloudParticle*) *i;
 247     particle->pos.x += particle->speed * elapsed_time;
 248   }
 249 }