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 "utils/lispreader.h"
  29 #include "utils/lispwriter.h"
  30 #include "video/drawing_context.h"
  31
  32 ParticleSystem::ParticleSystem()
  33 {
  34     virtual_width = screen->w;
  35     virtual_height = screen->h;
  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->w) pos.x -= virtual_width;
  67         if(pos.y > screen->h) 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(datadir+"/images/shared/snow0.png", true);
  77     snowimages[1] = new Surface(datadir+"/images/shared/snow1.png", true);
  78     snowimages[2] = new Surface(datadir+"/images/shared/snow2.png", true);
  79
  80     virtual_width = screen->w * 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 = rand() % int(virtual_width);
  87         particle->pos.y = rand() % screen->h;
  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(LispReader& reader)
 101 {
 102   reader.read_int("layer", layer);
 103 }
 104
 105 void
 106 SnowParticleSystem::write(LispWriter& 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::action(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->h) {
 126             particle->pos.y = fmodf(particle->pos.y , virtual_height);
 127             particle->pos.x = rand() % int(virtual_width);
 128         }
 129     }
 130 }
 131
 132 CloudParticleSystem::CloudParticleSystem()
 133 {
 134     cloudimage = new Surface(datadir + "/images/shared/cloud.png", true);
 135
 136     virtual_width = 2000.0;
 137
 138     // create some random clouds
 139     for(size_t i=0; i<15; ++i) {
 140         CloudParticle* particle = new CloudParticle;
 141         particle->pos.x = rand() % int(virtual_width);
 142         particle->pos.y = rand() % int(virtual_height);
 143         particle->texture = cloudimage;
 144         particle->speed = -float(25 + rand() % 30);
 145
 146         particles.push_back(particle);
 147     }
 148 }
 149
 150 void
 151 CloudParticleSystem::parse(LispReader& reader)
 152 {
 153   reader.read_int("layer", layer);
 154 }
 155
 156 void
 157 CloudParticleSystem::write(LispWriter& writer)
 158 {
 159   writer.start_list("particles-clouds");
 160   writer.write_int("layer", layer);
 161   writer.end_list("particles-clouds");
 162 }
 163
 164 CloudParticleSystem::~CloudParticleSystem()
 165 {
 166   delete cloudimage;
 167 }
 168
 169 void CloudParticleSystem::action(float elapsed_time)
 170 {
 171     std::vector<Particle*>::iterator i;
 172     for(i = particles.begin(); i != particles.end(); ++i) {
 173         CloudParticle* particle = (CloudParticle*) *i;
 174         particle->pos.x += particle->speed * elapsed_time;
 175     }
 176 }