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(float max_particle_size)
  36         : max_particle_size(max_particle_size)
  37 {
  38   virtual_width = SCREEN_WIDTH + max_particle_size * 2;
  39   virtual_height = SCREEN_HEIGHT + max_particle_size *2;
  40   z_pos = LAYER_BACKGROUND1;
  41 }
  42
  43 ParticleSystem::~ParticleSystem()
  44 {
  45   std::vector<Particle*>::iterator i;
  46   for(i = particles.begin(); i != particles.end(); ++i) {
  47     delete *i;
  48   }
  49 }
  50
  51 void ParticleSystem::draw(DrawingContext& context)
  52 {
  53   float scrollx = context.get_translation().x;
  54   float scrolly = context.get_translation().y;
  55
  56   context.push_transform();
  57   context.set_translation(Vector(max_particle_size,max_particle_size));
  58
  59   std::vector<Particle*>::iterator i;
  60   for(i = particles.begin(); i != particles.end(); ++i) {
  61     Particle* particle = *i;
  62
  63     // remap x,y coordinates onto screencoordinates
  64     Vector pos;
  65
  66     pos.x = fmodf(particle->pos.x - scrollx, virtual_width);
  67     if(pos.x < 0) pos.x += virtual_width;
  68
  69     pos.y = fmodf(particle->pos.y - scrolly, virtual_height);
  70     if(pos.y < 0) pos.y += virtual_height;
  71
  72
  73     //if(pos.x > virtual_width) pos.x -= virtual_width;
  74     //if(pos.y > virtual_height) pos.y -= virtual_height;
  75
  76     context.draw_surface(particle->texture, pos, z_pos);
  77   }
  78
  79   context.pop_transform();
  80 }
  81
  82 SnowParticleSystem::SnowParticleSystem()
  83 {
  84   snowimages[0] = new Surface("images/objects/particles/snow2.png");
  85   snowimages[1] = new Surface("images/objects/particles/snow1.png");
  86   snowimages[2] = new Surface("images/objects/particles/snow0.png");
  87
  88   virtual_width = SCREEN_WIDTH * 2;
  89
  90   // create some random snowflakes
  91   size_t snowflakecount = size_t(virtual_width/10.0);
  92   for(size_t i=0; i<snowflakecount; ++i) {
  93     SnowParticle* particle = new SnowParticle;
  94     int snowsize = systemRandom.rand(3);
  95
  96     particle->pos.x = systemRandom.randf(virtual_width);
  97     particle->pos.y = systemRandom.randf(SCREEN_HEIGHT);
  98     particle->anchorx = particle->pos.x + (systemRandom.randf(-0.5, 0.5) * 16);
  99     particle->drift_speed = systemRandom.randf(-0.5, 0.5) * 0.3;
 100     particle->wobble = 0.0;
 101
 102     particle->texture = snowimages[snowsize];
 103
 104     particle->speed = 1 + (2 - snowsize)/2 + systemRandom.randf(1.8);
 105     particle->speed *= 20; // gravity
 106
 107     particles.push_back(particle);
 108   }
 109 }
 110
 111 void
 112 SnowParticleSystem::parse(const lisp::Lisp& reader)
 113 {
 114   reader.get("z-pos", z_pos);
 115 }
 116
 117 void
 118 SnowParticleSystem::write(lisp::Writer& writer)
 119 {
 120   writer.start_list("particles-snow");
 121   writer.write_int("z-pos", z_pos);
 122   writer.end_list("particles-snow");
 123 }
 124
 125 SnowParticleSystem::~SnowParticleSystem()
 126 {
 127   for(int i=0;i<3;++i)
 128     delete snowimages[i];
 129 }
 130
 131 void SnowParticleSystem::update(float elapsed_time)
 132 {
 133   std::vector<Particle*>::iterator i;
 134
 135   for(i = particles.begin(); i != particles.end(); ++i) {
 136     SnowParticle* particle = (SnowParticle*) *i;
 137     float anchor_delta;
 138
 139     particle->pos.y += particle->speed * elapsed_time;
 140     particle->pos.x += particle->wobble * elapsed_time /* * particle->speed * 0.125*/;
 141
 142     anchor_delta = (particle->anchorx - particle->pos.x);
 143     particle->wobble += (4 * anchor_delta * 0.05) + systemRandom.randf(-0.5, 0.5);
 144     particle->wobble *= 0.99;
 145     particle->anchorx += particle->drift_speed * elapsed_time;
 146   }
 147 }
 148
 149 //FIXME: Sometimes both ghosts have the same image
 150 //       Ghosts don't change their movement pattern - not random
 151 GhostParticleSystem::GhostParticleSystem()
 152 {
 153   ghosts[0] = new Surface("images/objects/particles/ghost0.png");
 154   ghosts[1] = new Surface("images/objects/particles/ghost1.png");
 155
 156   virtual_width = SCREEN_WIDTH * 2;
 157
 158   // create two ghosts
 159   size_t ghostcount = 2;
 160   for(size_t i=0; i<ghostcount; ++i) {
 161     GhostParticle* particle = new GhostParticle;
 162     particle->pos.x = systemRandom.randf(virtual_width);
 163     particle->pos.y = systemRandom.randf(SCREEN_HEIGHT);
 164     int size = systemRandom.rand(2);
 165     particle->texture = ghosts[size];
 166     do {
 167       particle->speed = size*.2 + systemRandom.randf(3.6);
 168     } while(particle->speed < 1);
 169     particle->speed *= 50;
 170     particles.push_back(particle);
 171   }
 172 }
 173
 174 void
 175 GhostParticleSystem::parse(const lisp::Lisp& reader)
 176 {
 177   reader.get("z-pos", z_pos);
 178 }
 179
 180 void
 181 GhostParticleSystem::write(lisp::Writer& writer)
 182 {
 183   writer.start_list("particles-ghosts");
 184   writer.write_int("z-pos", z_pos);
 185   writer.end_list("particles-ghosts");
 186 }
 187
 188 GhostParticleSystem::~GhostParticleSystem()
 189 {
 190   for(int i=0;i<2;++i)
 191     delete ghosts[i];
 192 }
 193
 194 void GhostParticleSystem::update(float elapsed_time)
 195 {
 196   std::vector<Particle*>::iterator i;
 197   for(i = particles.begin(); i != particles.end(); ++i) {
 198     GhostParticle* particle = (GhostParticle*) *i;
 199     particle->pos.y -= particle->speed * elapsed_time;
 200     particle->pos.x -= particle->speed * elapsed_time;
 201     if(particle->pos.y > SCREEN_HEIGHT) {
 202       particle->pos.y = fmodf(particle->pos.y , virtual_height);
 203       particle->pos.x = systemRandom.rand(static_cast<int>(virtual_width));
 204     }
 205   }
 206 }
 207
 208 CloudParticleSystem::CloudParticleSystem()
 209         : ParticleSystem(128)
 210 {
 211   cloudimage = new Surface("images/objects/particles/cloud.png");
 212
 213   virtual_width = 2000.0;
 214
 215   // create some random clouds
 216   for(size_t i=0; i<15; ++i) {
 217     CloudParticle* particle = new CloudParticle;
 218     particle->pos.x = systemRandom.rand(static_cast<int>(virtual_width));
 219     particle->pos.y = systemRandom.rand(static_cast<int>(virtual_height));
 220     particle->texture = cloudimage;
 221     particle->speed = -systemRandom.randf(25.0, 54.0);
 222
 223     particles.push_back(particle);
 224   }
 225 }
 226
 227 void
 228 CloudParticleSystem::parse(const lisp::Lisp& reader)
 229 {
 230   reader.get("z-pos", z_pos);
 231 }
 232
 233 void
 234 CloudParticleSystem::write(lisp::Writer& writer)
 235 {
 236   writer.start_list("particles-clouds");
 237   writer.write_int("z-pos", z_pos);
 238   writer.end_list("particles-clouds");
 239 }
 240
 241 CloudParticleSystem::~CloudParticleSystem()
 242 {
 243   delete cloudimage;
 244 }
 245
 246 void CloudParticleSystem::update(float elapsed_time)
 247 {
 248   std::vector<Particle*>::iterator i;
 249   for(i = particles.begin(); i != particles.end(); ++i) {
 250     CloudParticle* particle = (CloudParticle*) *i;
 251     particle->pos.x += particle->speed * elapsed_time;
 252   }
 253 }