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
  34 ParticleSystem::ParticleSystem()
  35 {
  36   virtual_width = SCREEN_WIDTH;
  37   virtual_height = SCREEN_HEIGHT;
  38   z_pos = LAYER_BACKGROUND1;
  39 }
  40
  41 ParticleSystem::~ParticleSystem()
  42 {
  43   std::vector<Particle*>::iterator i;
  44   for(i = particles.begin(); i != particles.end(); ++i) {
  45     delete *i;
  46   }
  47 }
  48
  49 void ParticleSystem::draw(DrawingContext& context)
  50 {
  51   float scrollx = context.get_translation().x;
  52   float scrolly = context.get_translation().y;
  53
  54   context.push_transform();
  55   context.set_translation(Vector(0,0));
  56
  57   std::vector<Particle*>::iterator i;
  58   for(i = particles.begin(); i != particles.end(); ++i) {
  59     Particle* particle = *i;
  60
  61     // remap x,y coordinates onto screencoordinates
  62     Vector pos;
  63     pos.x = fmodf(particle->pos.x - scrollx, virtual_width);
  64     if(pos.x < 0) pos.x += virtual_width;
  65     pos.y = fmodf(particle->pos.y - scrolly, virtual_height);
  66     if(pos.y < 0) pos.y += virtual_height;
  67
  68     if(pos.x > SCREEN_WIDTH) pos.x -= virtual_width;
  69     if(pos.y > SCREEN_HEIGHT) pos.y -= virtual_height;
  70     context.draw_surface(particle->texture, pos, z_pos);
  71   }
  72
  73   context.pop_transform();
  74 }
  75
  76 SnowParticleSystem::SnowParticleSystem()
  77 {
  78   snowimages[0] = new Surface("images/objects/particles/snow0.png");
  79   snowimages[1] = new Surface("images/objects/particles/snow1.png");
  80   snowimages[2] = new Surface("images/objects/particles/snow2.png");
  81
  82   virtual_width = SCREEN_WIDTH * 2;
  83
  84   // create some random snowflakes
  85   size_t snowflakecount = size_t(virtual_width/10.0);
  86   for(size_t i=0; i<snowflakecount; ++i) {
  87     SnowParticle* particle = new SnowParticle;
  88     particle->pos.x = fmodf(rand(), virtual_width);
  89     particle->pos.y = fmodf(rand(), SCREEN_HEIGHT);
  90     int snowsize = rand() % 3;
  91     particle->texture = snowimages[snowsize];
  92     do {
  93       particle->speed = snowsize*.2 + (float(rand()%10)*.4);
  94     } while(particle->speed < 1);
  95     particle->speed *= 10; // gravity
  96
  97     particles.push_back(particle);
  98   }
  99 }
 100
 101 void
 102 SnowParticleSystem::parse(const lisp::Lisp& reader)
 103 {
 104   reader.get("z-pos", z_pos);
 105 }
 106
 107 void
 108 SnowParticleSystem::write(lisp::Writer& writer)
 109 {
 110   writer.start_list("particles-snow");
 111   writer.write_int("z-pos", z_pos);
 112   writer.end_list("particles-snow");
 113 }
 114
 115 SnowParticleSystem::~SnowParticleSystem()
 116 {
 117   for(int i=0;i<3;++i)
 118     delete snowimages[i];
 119 }
 120
 121 void SnowParticleSystem::update(float elapsed_time)
 122 {
 123   std::vector<Particle*>::iterator i;
 124   for(i = particles.begin(); i != particles.end(); ++i) {
 125     SnowParticle* particle = (SnowParticle*) *i;
 126     particle->pos.y += particle->speed * elapsed_time;
 127     if(particle->pos.y > SCREEN_HEIGHT + Sector::current()->camera->get_translation().y) {
 128       particle->pos.y = fmodf(particle->pos.y , virtual_height);
 129       particle->pos.x = rand() % int(virtual_width);
 130     }
 131   }
 132 }
 133
 134 //FIXME: Sometimes both ghosts have the same image
 135 //       Ghosts don't change their movement pattern - not random
 136 GhostParticleSystem::GhostParticleSystem()
 137 {
 138   ghosts[0] = new Surface("images/objects/particles/ghost0.png");
 139   ghosts[1] = new Surface("images/objects/particles/ghost1.png");
 140
 141   virtual_width = SCREEN_WIDTH * 2;
 142
 143   // create two ghosts
 144   size_t ghostcount = 2;
 145   for(size_t i=0; i<ghostcount; ++i) {
 146     GhostParticle* particle = new GhostParticle;
 147     particle->pos.x = fmodf(rand(), virtual_width);
 148     particle->pos.y = fmodf(rand(), SCREEN_HEIGHT);
 149     int size = rand() % 2;
 150     particle->texture = ghosts[size];
 151     do {
 152       particle->speed = size*.2 + (float(rand()%10)*.4);
 153     } while(particle->speed < 1);
 154     particle->speed *= 50;
 155     particles.push_back(particle);
 156   }
 157 }
 158
 159 void
 160 GhostParticleSystem::parse(const lisp::Lisp& reader)
 161 {
 162   reader.get("z-pos", z_pos);
 163 }
 164
 165 void
 166 GhostParticleSystem::write(lisp::Writer& writer)
 167 {
 168   writer.start_list("particles-ghosts");
 169   writer.write_int("z-pos", z_pos);
 170   writer.end_list("particles-ghosts");
 171 }
 172
 173 GhostParticleSystem::~GhostParticleSystem()
 174 {
 175   for(int i=0;i<2;++i)
 176     delete ghosts[i];
 177 }
 178
 179 void GhostParticleSystem::update(float elapsed_time)
 180 {
 181   std::vector<Particle*>::iterator i;
 182   for(i = particles.begin(); i != particles.end(); ++i) {
 183     GhostParticle* particle = (GhostParticle*) *i;
 184     particle->pos.y -= particle->speed * elapsed_time;
 185     particle->pos.x -= particle->speed * elapsed_time;
 186     if(particle->pos.y > SCREEN_HEIGHT) {
 187       particle->pos.y = fmodf(particle->pos.y , virtual_height);
 188       particle->pos.x = rand() % int(virtual_width);
 189     }
 190   }
 191 }
 192
 193 CloudParticleSystem::CloudParticleSystem()
 194 {
 195   cloudimage = new Surface("images/objects/particles/cloud.png");
 196
 197   virtual_width = 2000.0;
 198
 199   // create some random clouds
 200   for(size_t i=0; i<15; ++i) {
 201     CloudParticle* particle = new CloudParticle;
 202     particle->pos.x = rand() % int(virtual_width);
 203     particle->pos.y = rand() % int(virtual_height);
 204     particle->texture = cloudimage;
 205     particle->speed = -float(25 + rand() % 30);
 206
 207     particles.push_back(particle);
 208   }
 209 }
 210
 211 void
 212 CloudParticleSystem::parse(const lisp::Lisp& reader)
 213 {
 214   reader.get("z-pos", z_pos);
 215 }
 216
 217 void
 218 CloudParticleSystem::write(lisp::Writer& writer)
 219 {
 220   writer.start_list("particles-clouds");
 221   writer.write_int("z-pos", z_pos);
 222   writer.end_list("particles-clouds");
 223 }
 224
 225 CloudParticleSystem::~CloudParticleSystem()
 226 {
 227   delete cloudimage;
 228 }
 229
 230 void CloudParticleSystem::update(float elapsed_time)
 231 {
 232   std::vector<Particle*>::iterator i;
 233   for(i = particles.begin(); i != particles.end(); ++i) {
 234     CloudParticle* particle = (CloudParticle*) *i;
 235     particle->pos.x += particle->speed * elapsed_time;
 236   }
 237 }