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
  20
  21 #include <config.h>
  22
  23 #include <iostream>
  24 #include <cmath>
  25
  26 #include "particlesystem.h"
  27 #include "app/globals.h"
  28 #include "video/drawing_context.h"
  29 #include "lisp/parser.h"
  30 #include "lisp/lisp.h"
  31 #include "lisp/writer.h"
  32
  33 ParticleSystem::ParticleSystem()
  34 {
  35     virtual_width = screen->w;
  36     virtual_height = screen->h;
  37     layer = LAYER_BACKGROUND1;
  38 }
  39
  40 ParticleSystem::~ParticleSystem()
  41 {
  42     std::vector<Particle*>::iterator i;
  43     for(i = particles.begin(); i != particles.end(); ++i) {
  44         delete *i;
  45     }
  46 }
  47
  48 void ParticleSystem::draw(DrawingContext& context)
  49 {
  50   float scrollx = context.get_translation().x;
  51   float scrolly = context.get_translation().y;
  52
  53   context.push_transform();
  54   context.set_translation(Vector(0,0));
  55
  56     std::vector<Particle*>::iterator i;
  57     for(i = particles.begin(); i != particles.end(); ++i) {
  58         Particle* particle = *i;
  59
  60         // remap x,y coordinates onto screencoordinates
  61         Vector pos;
  62         pos.x = fmodf(particle->pos.x - scrollx, virtual_width);
  63         if(pos.x < 0) pos.x += virtual_width;
  64         pos.y = fmodf(particle->pos.y - scrolly, virtual_height);
  65         if(pos.y < 0) pos.y += virtual_height;
  66
  67         if(pos.x > screen->w) pos.x -= virtual_width;
  68         if(pos.y > screen->h) pos.y -= virtual_height;
  69         context.draw_surface(particle->texture, pos, layer);
  70     }
  71
  72     context.pop_transform();
  73 }
  74
  75 SnowParticleSystem::SnowParticleSystem()
  76 {
  77     snowimages[0] = new Surface(datadir+"/images/shared/snow0.png", true);
  78     snowimages[1] = new Surface(datadir+"/images/shared/snow1.png", true);
  79     snowimages[2] = new Surface(datadir+"/images/shared/snow2.png", true);
  80
  81     virtual_width = screen->w * 2;
  82
  83     // create some random snowflakes
  84     size_t snowflakecount = size_t(virtual_width/10.0);
  85     for(size_t i=0; i<snowflakecount; ++i) {
  86         SnowParticle* particle = new SnowParticle;
  87         particle->pos.x = rand() % int(virtual_width);
  88         particle->pos.y = rand() % screen->h;
  89         int snowsize = rand() % 3;
  90         particle->texture = snowimages[snowsize];
  91         do {
  92             particle->speed = snowsize*.2 + (float(rand()%10)*.4);
  93         } while(particle->speed < 1);
  94         particle->speed *= 10; // gravity
  95
  96         particles.push_back(particle);
  97     }
  98 }
  99
 100 void
 101 SnowParticleSystem::parse(const lisp::Lisp& reader)
 102 {
 103   reader.get("layer", layer);
 104 }
 105
 106 void
 107 SnowParticleSystem::write(lisp::Writer& writer)
 108 {
 109   writer.start_list("particles-snow");
 110   writer.write_int("layer", layer);
 111   writer.end_list("particles-snow");
 112 }
 113
 114 SnowParticleSystem::~SnowParticleSystem()
 115 {
 116   for(int i=0;i<3;++i)
 117     delete snowimages[i];
 118 }
 119
 120 void SnowParticleSystem::action(float elapsed_time)
 121 {
 122     std::vector<Particle*>::iterator i;
 123     for(i = particles.begin(); i != particles.end(); ++i) {
 124         SnowParticle* particle = (SnowParticle*) *i;
 125         particle->pos.y += particle->speed * elapsed_time;
 126         if(particle->pos.y > screen->h) {
 127             particle->pos.y = fmodf(particle->pos.y , virtual_height);
 128             particle->pos.x = rand() % int(virtual_width);
 129         }
 130     }
 131 }
 132
 133 CloudParticleSystem::CloudParticleSystem()
 134 {
 135     cloudimage = new Surface(datadir + "/images/shared/cloud.png", true);
 136
 137     virtual_width = 2000.0;
 138
 139     // create some random clouds
 140     for(size_t i=0; i<15; ++i) {
 141         CloudParticle* particle = new CloudParticle;
 142         particle->pos.x = rand() % int(virtual_width);
 143         particle->pos.y = rand() % int(virtual_height);
 144         particle->texture = cloudimage;
 145         particle->speed = -float(25 + rand() % 30);
 146
 147         particles.push_back(particle);
 148     }
 149 }
 150
 151 void
 152 CloudParticleSystem::parse(const lisp::Lisp& reader)
 153 {
 154   reader.get("layer", layer);
 155 }
 156
 157 void
 158 CloudParticleSystem::write(lisp::Writer& writer)
 159 {
 160   writer.start_list("particles-clouds");
 161   writer.write_int("layer", layer);
 162   writer.end_list("particles-clouds");
 163 }
 164
 165 CloudParticleSystem::~CloudParticleSystem()
 166 {
 167   delete cloudimage;
 168 }
 169
 170 void CloudParticleSystem::action(float elapsed_time)
 171 {
 172     std::vector<Particle*>::iterator i;
 173     for(i = particles.begin(); i != particles.end(); ++i) {
 174         CloudParticle* particle = (CloudParticle*) *i;
 175         particle->pos.x += particle->speed * elapsed_time;
 176     }
 177 }