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 #include "particlesystem.h"
  21
  22 #include <iostream>
  23 #include <math.h>
  24 #include "globals.h"
  25 #include "world.h"
  26 #include "level.h"
  27 #include "scene.h"
  28
  29 ParticleSystem::ParticleSystem()
  30 {
  31     virtual_width = screen->w;
  32     virtual_height = screen->h;
  33 }
  34
  35 ParticleSystem::~ParticleSystem()
  36 {
  37     std::vector<Particle*>::iterator i;
  38     for(i = particles.begin(); i != particles.end(); ++i) {
  39         delete *i;
  40     }
  41 }
  42
  43 void ParticleSystem::draw(float scrollx, float scrolly, int layer)
  44 {
  45     std::vector<Particle*>::iterator i;
  46     for(i = particles.begin(); i != particles.end(); ++i) {
  47         Particle* particle = *i;
  48         if(particle->layer != layer)
  49             continue;
  50
  51         // remap x,y coordinates onto screencoordinates
  52         float x = fmodf(particle->x - scrollx, virtual_width);
  53         if(x < 0) x += virtual_width;
  54         float y = fmodf(particle->y - scrolly, virtual_height);
  55         if(y < 0) y += virtual_height;
  56         float xmax = fmodf(x + particle->texture->w, virtual_width);
  57         float ymax = fmodf(y + particle->texture->h, virtual_height);
  58
  59         // particle on screen
  60         if(x >= screen->w && xmax >= screen->w)
  61             continue;
  62         if(y >= screen->h && ymax >= screen->h)
  63             continue;
  64
  65         if(x > screen->w) x -= virtual_width;
  66         if(y > screen->h) y -= virtual_height;
  67         particle->texture->draw(x, y);
  68     }
  69 }
  70
  71 SnowParticleSystem::SnowParticleSystem()
  72 {
  73     snowimages[0] = new Surface(datadir+"/images/shared/snow0.png", USE_ALPHA);
  74     snowimages[1] = new Surface(datadir+"/images/shared/snow1.png", USE_ALPHA);
  75     snowimages[2] = new Surface(datadir+"/images/shared/snow2.png", USE_ALPHA);
  76
  77     virtual_width = screen->w * 2;
  78
  79     // create some random snowflakes
  80     size_t snowflakecount = size_t(virtual_width/10.0);
  81     for(size_t i=0; i<snowflakecount; ++i) {
  82         SnowParticle* particle = new SnowParticle;
  83         particle->x = rand() % int(virtual_width);
  84         particle->y = rand() % screen->h;
  85         particle->layer = i % 2;
  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         particle->speed *= World::current()->get_level()->gravity;
  92
  93         particles.push_back(particle);
  94     }
  95 }
  96
  97 SnowParticleSystem::~SnowParticleSystem()
  98 {
  99   for(int i=0;i<3;++i)
 100     delete snowimages[i];
 101 }
 102
 103 void SnowParticleSystem::simulate(float elapsed_time)
 104 {
 105     std::vector<Particle*>::iterator i;
 106     for(i = particles.begin(); i != particles.end(); ++i) {
 107         SnowParticle* particle = (SnowParticle*) *i;
 108         particle->y += particle->speed * elapsed_time;
 109         if(particle->y > screen->h) {
 110             particle->y = fmodf(particle->y , virtual_height);
 111             particle->x = rand() % int(virtual_width);
 112         }
 113     }
 114 }
 115
 116 CloudParticleSystem::CloudParticleSystem()
 117 {
 118     cloudimage = new Surface(datadir + "/images/shared/cloud.png", USE_ALPHA);
 119
 120     virtual_width = 2000.0;
 121
 122     // create some random clouds
 123     for(size_t i=0; i<15; ++i) {
 124         CloudParticle* particle = new CloudParticle;
 125         particle->x = rand() % int(virtual_width);
 126         particle->y = rand() % int(virtual_height);
 127         particle->layer = 0;
 128         particle->texture = cloudimage;
 129         particle->speed = -float(250 + rand() % 200) / 1000.0;
 130
 131         particles.push_back(particle);
 132     }
 133 }
 134
 135 CloudParticleSystem::~CloudParticleSystem()
 136 {
 137   delete cloudimage;
 138 }
 139
 140 void CloudParticleSystem::simulate(float elapsed_time)
 141 {
 142     std::vector<Particle*>::iterator i;
 143     for(i = particles.begin(); i != particles.end(); ++i) {
 144         CloudParticle* particle = (CloudParticle*) *i;
 145         particle->x += particle->speed * elapsed_time;
 146     }
 147 }