src/object/particlesystem.cpp

   1 //  $Id$
   2 //
   3 //  SuperTux
   4 //  Copyright (C) 2004 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 #include <config.h>
  20
  21 #include <iostream>
  22 #include <cmath>
  23
  24 #include "particlesystem.hpp"
  25 #include "video/drawing_context.hpp"
  26 #include "lisp/parser.hpp"
  27 #include "lisp/lisp.hpp"
  28 #include "lisp/writer.hpp"
  29 #include "resources.hpp"
  30 #include "main.hpp"
  31
  32 ParticleSystem::ParticleSystem()
  33 {
  34     virtual_width = SCREEN_WIDTH;
  35     virtual_height = SCREEN_HEIGHT;
  36     layer = LAYER_BACKGROUND1;
  37 }
  38
  39 ParticleSystem::~ParticleSystem()
  40 {
  41     std::vector<Particle*>::iterator i;
  42     for(i = particles.begin(); i != particles.end(); ++i) {
  43         delete *i;
  44     }
  45 }
  46
  47 void ParticleSystem::draw(DrawingContext& context)
  48 {
  49   float scrollx = context.get_translation().x;
  50   float scrolly = context.get_translation().y;
  51
  52   context.push_transform();
  53   context.set_translation(Vector(0,0));
  54
  55     std::vector<Particle*>::iterator i;
  56     for(i = particles.begin(); i != particles.end(); ++i) {
  57         Particle* particle = *i;
  58
  59         // remap x,y coordinates onto screencoordinates
  60         Vector pos;
  61         pos.x = fmodf(particle->pos.x - scrollx, virtual_width);
  62         if(pos.x < 0) pos.x += virtual_width;
  63         pos.y = fmodf(particle->pos.y - scrolly, virtual_height);
  64         if(pos.y < 0) pos.y += virtual_height;
  65
  66         if(pos.x > SCREEN_WIDTH) pos.x -= virtual_width;
  67         if(pos.y > SCREEN_HEIGHT) pos.y -= virtual_height;
  68         context.draw_surface(particle->texture, pos, layer);
  69     }
  70
  71     context.pop_transform();
  72 }
  73
  74 SnowParticleSystem::SnowParticleSystem()
  75 {
  76     snowimages[0] = new Surface("images/objects/particles/snow0.png");
  77     snowimages[1] = new Surface("images/objects/particles/snow1.png");
  78     snowimages[2] = new Surface("images/objects/particles/snow2.png");
  79
  80     virtual_width = SCREEN_WIDTH * 2;
  81
  82     // create some random snowflakes
  83     size_t snowflakecount = size_t(virtual_width/10.0);
  84     for(size_t i=0; i<snowflakecount; ++i) {
  85         SnowParticle* particle = new SnowParticle;
  86         particle->pos.x = fmodf(rand(), virtual_width);
  87         particle->pos.y = fmodf(rand(), SCREEN_HEIGHT);
  88         int snowsize = rand() % 3;
  89         particle->texture = snowimages[snowsize];
  90         do {
  91             particle->speed = snowsize*.2 + (float(rand()%10)*.4);
  92         } while(particle->speed < 1);
  93         particle->speed *= 10; // gravity
  94
  95         particles.push_back(particle);
  96     }
  97 }
  98
  99 void
 100 SnowParticleSystem::parse(const lisp::Lisp& reader)
 101 {
 102   reader.get("layer", layer);
 103 }
 104
 105 void
 106 SnowParticleSystem::write(lisp::Writer& writer)
 107 {
 108   writer.start_list("particles-snow");
 109   writer.write_int("layer", layer);
 110   writer.end_list("particles-snow");
 111 }
 112
 113 SnowParticleSystem::~SnowParticleSystem()
 114 {
 115   for(int i=0;i<3;++i)
 116     delete snowimages[i];
 117 }
 118
 119 void SnowParticleSystem::update(float elapsed_time)
 120 {
 121     std::vector<Particle*>::iterator i;
 122     for(i = particles.begin(); i != particles.end(); ++i) {
 123         SnowParticle* particle = (SnowParticle*) *i;
 124         particle->pos.y += particle->speed * elapsed_time;
 125         if(particle->pos.y > SCREEN_HEIGHT) {
 126             particle->pos.y = fmodf(particle->pos.y , virtual_height);
 127             particle->pos.x = rand() % int(virtual_width);
 128         }
 129     }
 130 }
 131
 132 //FIXME: Sometimes both ghosts have the same image
 133 //       Ghosts don't change their movement pattern - not random
 134 GhostParticleSystem::GhostParticleSystem()
 135 {
 136     ghosts[0] = new Surface("images/objects/particles/ghost0.png");
 137     ghosts[1] = new Surface("images/objects/particles/ghost1.png");
 138
 139     virtual_width = SCREEN_WIDTH * 2;
 140
 141     // create two ghosts
 142     size_t ghostcount = 2;
 143     for(size_t i=0; i<ghostcount; ++i) {
 144         GhostParticle* particle = new GhostParticle;
 145         particle->pos.x = fmodf(rand(), virtual_width);
 146         particle->pos.y = fmodf(rand(), SCREEN_HEIGHT);
 147         int size = rand() % 2;
 148         particle->texture = ghosts[size];
 149         do {
 150             particle->speed = size*.2 + (float(rand()%10)*.4);
 151         } while(particle->speed < 1);
 152         particle->speed *= 50;
 153         particles.push_back(particle);
 154     }
 155 }
 156
 157 void
 158 GhostParticleSystem::parse(const lisp::Lisp& reader)
 159 {
 160   reader.get("layer", layer);
 161 }
 162
 163 void
 164 GhostParticleSystem::write(lisp::Writer& writer)
 165 {
 166   writer.start_list("particles-ghosts");
 167   writer.write_int("layer", layer);
 168   writer.end_list("particles-ghosts");
 169 }
 170
 171 GhostParticleSystem::~GhostParticleSystem()
 172 {
 173   for(int i=0;i<2;++i)
 174     delete ghosts[i];
 175 }
 176
 177 void GhostParticleSystem::update(float elapsed_time)
 178 {
 179     std::vector<Particle*>::iterator i;
 180     for(i = particles.begin(); i != particles.end(); ++i) {
 181         GhostParticle* particle = (GhostParticle*) *i;
 182         particle->pos.y -= particle->speed * elapsed_time;
 183         particle->pos.x -= particle->speed * elapsed_time;
 184         if(particle->pos.y > SCREEN_HEIGHT) {
 185             particle->pos.y = fmodf(particle->pos.y , virtual_height);
 186             particle->pos.x = rand() % int(virtual_width);
 187         }
 188     }
 189 }
 190
 191 CloudParticleSystem::CloudParticleSystem()
 192 {
 193     cloudimage = new Surface("images/objects/particles/cloud.png");
 194
 195     virtual_width = 2000.0;
 196
 197     // create some random clouds
 198     for(size_t i=0; i<15; ++i) {
 199         CloudParticle* particle = new CloudParticle;
 200         particle->pos.x = rand() % int(virtual_width);
 201         particle->pos.y = rand() % int(virtual_height);
 202         particle->texture = cloudimage;
 203         particle->speed = -float(25 + rand() % 30);
 204
 205         particles.push_back(particle);
 206     }
 207 }
 208
 209 void
 210 CloudParticleSystem::parse(const lisp::Lisp& reader)
 211 {
 212   reader.get("layer", layer);
 213 }
 214
 215 void
 216 CloudParticleSystem::write(lisp::Writer& writer)
 217 {
 218   writer.start_list("particles-clouds");
 219   writer.write_int("layer", layer);
 220   writer.end_list("particles-clouds");
 221 }
 222
 223 CloudParticleSystem::~CloudParticleSystem()
 224 {
 225   delete cloudimage;
 226 }
 227
 228 void CloudParticleSystem::update(float elapsed_time)
 229 {
 230     std::vector<Particle*>::iterator i;
 231     for(i = particles.begin(); i != particles.end(); ++i) {
 232         CloudParticle* particle = (CloudParticle*) *i;
 233         particle->pos.x += particle->speed * elapsed_time;
 234     }
 235 }