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     int snowsize = systemRandom.rand(3);
  94
  95     particle->pos.x = systemRandom.randf(virtual_width);
  96     particle->pos.y = systemRandom.randf(SCREEN_HEIGHT);
  97     particle->anchorx = particle->pos.x + (systemRandom.randf(-0.5, 0.5) * 16);
  98     particle->drift_speed = systemRandom.randf(-0.5, 0.5) * 0.3;
  99     particle->wobble = 0.0;
 100
 101     particle->texture = snowimages[snowsize];
 102
 103     particle->speed = 1 + (2 - snowsize)/2 + systemRandom.randf(1.8);
 104     particle->speed *= 20; // gravity
 105
 106     particles.push_back(particle);
 107   }
 108 }
 109
 110 void
 111 SnowParticleSystem::parse(const lisp::Lisp& reader)
 112 {
 113   reader.get("z-pos", z_pos);
 114 }
 115
 116 void
 117 SnowParticleSystem::write(lisp::Writer& writer)
 118 {
 119   writer.start_list("particles-snow");
 120   writer.write_int("z-pos", z_pos);
 121   writer.end_list("particles-snow");
 122 }
 123
 124 SnowParticleSystem::~SnowParticleSystem()
 125 {
 126   for(int i=0;i<3;++i)
 127     delete snowimages[i];
 128 }
 129
 130 void SnowParticleSystem::update(float elapsed_time)
 131 {
 132   std::vector<Particle*>::iterator i;
 133
 134   for(i = particles.begin(); i != particles.end(); ++i) {
 135     SnowParticle* particle = (SnowParticle*) *i;
 136     float anchor_delta;
 137
 138     particle->pos.y += particle->speed * elapsed_time;
 139     particle->pos.x += particle->wobble * elapsed_time /* * particle->speed * 0.125*/;
 140
 141     anchor_delta = (particle->anchorx - particle->pos.x);
 142     particle->wobble += (4 * anchor_delta * 0.05) + systemRandom.randf(-0.5, 0.5);
 143     particle->wobble *= 0.99;
 144     particle->anchorx += particle->drift_speed * elapsed_time;
 145   }
 146 }
 147
 148 //FIXME: Sometimes both ghosts have the same image
 149 //       Ghosts don't change their movement pattern - not random
 150 GhostParticleSystem::GhostParticleSystem()
 151 {
 152   ghosts[0] = new Surface("images/objects/particles/ghost0.png");
 153   ghosts[1] = new Surface("images/objects/particles/ghost1.png");
 154
 155   virtual_width = SCREEN_WIDTH * 2;
 156
 157   // create two ghosts
 158   size_t ghostcount = 2;
 159   for(size_t i=0; i<ghostcount; ++i) {
 160     GhostParticle* particle = new GhostParticle;
 161     particle->pos.x = systemRandom.randf(virtual_width);
 162     particle->pos.y = systemRandom.randf(SCREEN_HEIGHT);
 163     int size = systemRandom.rand(2);
 164     particle->texture = ghosts[size];
 165     do {
 166       particle->speed = size*.2 + systemRandom.randf(3.6);
 167     } while(particle->speed < 1);
 168     particle->speed *= 50;
 169     particles.push_back(particle);
 170   }
 171 }
 172
 173 void
 174 GhostParticleSystem::parse(const lisp::Lisp& reader)
 175 {
 176   reader.get("z-pos", z_pos);
 177 }
 178
 179 void
 180 GhostParticleSystem::write(lisp::Writer& writer)
 181 {
 182   writer.start_list("particles-ghosts");
 183   writer.write_int("z-pos", z_pos);
 184   writer.end_list("particles-ghosts");
 185 }
 186
 187 GhostParticleSystem::~GhostParticleSystem()
 188 {
 189   for(int i=0;i<2;++i)
 190     delete ghosts[i];
 191 }
 192
 193 void GhostParticleSystem::update(float elapsed_time)
 194 {
 195   std::vector<Particle*>::iterator i;
 196   for(i = particles.begin(); i != particles.end(); ++i) {
 197     GhostParticle* particle = (GhostParticle*) *i;
 198     particle->pos.y -= particle->speed * elapsed_time;
 199     particle->pos.x -= particle->speed * elapsed_time;
 200     if(particle->pos.y > SCREEN_HEIGHT) {
 201       particle->pos.y = fmodf(particle->pos.y , virtual_height);
 202       particle->pos.x = systemRandom.rand(static_cast<int>(virtual_width));
 203     }
 204   }
 205 }
 206
 207 CloudParticleSystem::CloudParticleSystem()
 208 {
 209   cloudimage = new Surface("images/objects/particles/cloud.png");
 210
 211   virtual_width = 2000.0;
 212
 213   // create some random clouds
 214   for(size_t i=0; i<15; ++i) {
 215     CloudParticle* particle = new CloudParticle;
 216     particle->pos.x = systemRandom.rand(static_cast<int>(virtual_width));
 217     particle->pos.y = systemRandom.rand(static_cast<int>(virtual_height));
 218     particle->texture = cloudimage;
 219     particle->speed = -systemRandom.randf(25.0, 54.0);
 220
 221     particles.push_back(particle);
 222   }
 223 }
 224
 225 void
 226 CloudParticleSystem::parse(const lisp::Lisp& reader)
 227 {
 228   reader.get("z-pos", z_pos);
 229 }
 230
 231 void
 232 CloudParticleSystem::write(lisp::Writer& writer)
 233 {
 234   writer.start_list("particles-clouds");
 235   writer.write_int("z-pos", z_pos);
 236   writer.end_list("particles-clouds");
 237 }
 238
 239 CloudParticleSystem::~CloudParticleSystem()
 240 {
 241   delete cloudimage;
 242 }
 243
 244 void CloudParticleSystem::update(float elapsed_time)
 245 {
 246   std::vector<Particle*>::iterator i;
 247   for(i = particles.begin(); i != particles.end(); ++i) {
 248     CloudParticle* particle = (CloudParticle*) *i;
 249     particle->pos.x += particle->speed * elapsed_time;
 250   }
 251 }