src/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/60.0 + (float(rand()%10)/300.0);
  92         } while(particle->speed < 0.01);
  93
  94         particles.push_back(particle);
  95     }
  96 }
  97
  98 void
  99 SnowParticleSystem::parse(LispReader& reader)
 100 {
 101   reader.read_int("layer", layer);
 102 }
 103
 104 void
 105 SnowParticleSystem::write(LispWriter& writer)
 106 {
 107   writer.start_list("particles-snow");
 108   writer.write_int("layer", layer);
 109   writer.end_list("particles-snow");
 110 }
 111
 112 SnowParticleSystem::~SnowParticleSystem()
 113 {
 114   for(int i=0;i<3;++i)
 115     delete snowimages[i];
 116 }
 117
 118 void SnowParticleSystem::action(float elapsed_time)
 119 {
 120     std::vector<Particle*>::iterator i;
 121     for(i = particles.begin(); i != particles.end(); ++i) {
 122         SnowParticle* particle = (SnowParticle*) *i;
 123         particle->pos.y += particle->speed * elapsed_time;
 124         if(particle->pos.y > screen->h) {
 125             particle->pos.y = fmodf(particle->pos.y , virtual_height);
 126             particle->pos.x = rand() % int(virtual_width);
 127         }
 128     }
 129 }
 130
 131 CloudParticleSystem::CloudParticleSystem()
 132 {
 133     cloudimage = new Surface(datadir + "/images/shared/cloud.png", true);
 134
 135     virtual_width = 2000.0;
 136
 137     // create some random clouds
 138     for(size_t i=0; i<15; ++i) {
 139         CloudParticle* particle = new CloudParticle;
 140         particle->pos.x = rand() % int(virtual_width);
 141         particle->pos.y = rand() % int(virtual_height);
 142         particle->texture = cloudimage;
 143         particle->speed = -float(25 + rand() % 30);
 144
 145         particles.push_back(particle);
 146     }
 147 }
 148
 149 void
 150 CloudParticleSystem::parse(LispReader& reader)
 151 {
 152   reader.read_int("layer", layer);
 153 }
 154
 155 void
 156 CloudParticleSystem::write(LispWriter& writer)
 157 {
 158   writer.start_list("particles-clouds");
 159   writer.write_int("layer", layer);
 160   writer.end_list("particles-clouds");
 161 }
 162
 163 CloudParticleSystem::~CloudParticleSystem()
 164 {
 165   delete cloudimage;
 166 }
 167
 168 void CloudParticleSystem::action(float elapsed_time)
 169 {
 170     std::vector<Particle*>::iterator i;
 171     for(i = particles.begin(); i != particles.end(); ++i) {
 172         CloudParticle* particle = (CloudParticle*) *i;
 173         particle->pos.x += particle->speed * elapsed_time;
 174     }
 175 }