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 <iostream>
  22 #include <cmath>
  23
  24 #include "particlesystem.h"
  25 #include "globals.h"
  26 #include "lispreader.h"
  27 #include "lispwriter.h"
  28 #include "screen/drawing_context.h"
  29
  30 ParticleSystem::ParticleSystem()
  31 {
  32     virtual_width = screen->w;
  33     virtual_height = screen->h;
  34     layer = LAYER_BACKGROUND1;
  35 }
  36
  37 ParticleSystem::~ParticleSystem()
  38 {
  39     std::vector<Particle*>::iterator i;
  40     for(i = particles.begin(); i != particles.end(); ++i) {
  41         delete *i;
  42     }
  43 }
  44
  45 void ParticleSystem::draw(DrawingContext& context)
  46 {
  47   float scrollx = context.get_translation().x;
  48   float scrolly = context.get_translation().y;
  49
  50   context.push_transform();
  51   context.set_translation(Vector(0,0));
  52
  53     std::vector<Particle*>::iterator i;
  54     for(i = particles.begin(); i != particles.end(); ++i) {
  55         Particle* particle = *i;
  56
  57         // remap x,y coordinates onto screencoordinates
  58         Vector pos;
  59         pos.x = fmodf(particle->pos.x - scrollx, virtual_width);
  60         if(pos.x < 0) pos.x += virtual_width;
  61         pos.y = fmodf(particle->pos.y - scrolly, virtual_height);
  62         if(pos.y < 0) pos.y += virtual_height;
  63
  64         if(pos.x > screen->w) pos.x -= virtual_width;
  65         if(pos.y > screen->h) pos.y -= virtual_height;
  66         context.draw_surface(particle->texture, pos, layer);
  67     }
  68
  69     context.pop_transform();
  70 }
  71
  72 SnowParticleSystem::SnowParticleSystem()
  73 {
  74     snowimages[0] = new Surface(datadir+"/images/shared/snow0.png", USE_ALPHA);
  75     snowimages[1] = new Surface(datadir+"/images/shared/snow1.png", USE_ALPHA);
  76     snowimages[2] = new Surface(datadir+"/images/shared/snow2.png", USE_ALPHA);
  77
  78     virtual_width = screen->w * 2;
  79
  80     // create some random snowflakes
  81     size_t snowflakecount = size_t(virtual_width/10.0);
  82     for(size_t i=0; i<snowflakecount; ++i) {
  83         SnowParticle* particle = new SnowParticle;
  84         particle->pos.x = rand() % int(virtual_width);
  85         particle->pos.y = rand() % screen->h;
  86         int snowsize = rand() % 3;
  87         particle->texture = snowimages[snowsize];
  88         do {
  89             particle->speed = snowsize/60.0 + (float(rand()%10)/300.0);
  90         } while(particle->speed < 0.01);
  91
  92         particles.push_back(particle);
  93     }
  94 }
  95
  96 void
  97 SnowParticleSystem::parse(LispReader& reader)
  98 {
  99   reader.read_int("layer", layer);
 100 }
 101
 102 void
 103 SnowParticleSystem::write(LispWriter& writer)
 104 {
 105   writer.start_list("particles-snow");
 106   writer.write_int("layer", layer);
 107   writer.end_list("particles-snow");
 108 }
 109
 110 SnowParticleSystem::~SnowParticleSystem()
 111 {
 112   for(int i=0;i<3;++i)
 113     delete snowimages[i];
 114 }
 115
 116 void SnowParticleSystem::action(float elapsed_time)
 117 {
 118     std::vector<Particle*>::iterator i;
 119     for(i = particles.begin(); i != particles.end(); ++i) {
 120         SnowParticle* particle = (SnowParticle*) *i;
 121         particle->pos.y += particle->speed * elapsed_time;
 122         if(particle->pos.y > screen->h) {
 123             particle->pos.y = fmodf(particle->pos.y , virtual_height);
 124             particle->pos.x = rand() % int(virtual_width);
 125         }
 126     }
 127 }
 128
 129 CloudParticleSystem::CloudParticleSystem()
 130 {
 131     cloudimage = new Surface(datadir + "/images/shared/cloud.png", USE_ALPHA);
 132
 133     virtual_width = 2000.0;
 134
 135     // create some random clouds
 136     for(size_t i=0; i<15; ++i) {
 137         CloudParticle* particle = new CloudParticle;
 138         particle->pos.x = rand() % int(virtual_width);
 139         particle->pos.y = rand() % int(virtual_height);
 140         particle->texture = cloudimage;
 141         particle->speed = -float(250 + rand() % 200) / 1000.0;
 142
 143         particles.push_back(particle);
 144     }
 145 }
 146
 147 void
 148 CloudParticleSystem::parse(LispReader& reader)
 149 {
 150   reader.read_int("layer", layer);
 151 }
 152
 153 void
 154 CloudParticleSystem::write(LispWriter& writer)
 155 {
 156   writer.start_list("particles-clouds");
 157   writer.write_int("layer", layer);
 158   writer.end_list("particles-clouds");
 159 }
 160
 161 CloudParticleSystem::~CloudParticleSystem()
 162 {
 163   delete cloudimage;
 164 }
 165
 166 void CloudParticleSystem::action(float elapsed_time)
 167 {
 168     std::vector<Particle*>::iterator i;
 169     for(i = particles.begin(); i != particles.end(); ++i) {
 170         CloudParticle* particle = (CloudParticle*) *i;
 171         particle->pos.x += particle->speed * elapsed_time;
 172     }
 173 }