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 #include "particlesystem.h"
  20
  21 #include <iostream>
  22 #include <math.h>
  23 #include "globals.h"
  24 #include "world.h"
  25 #include "level.h"
  26 #include "scene.h"
  27
  28 ParticleSystem::ParticleSystem()
  29 {
  30     virtual_width = screen->w;
  31     virtual_height = screen->h;
  32 }
  33
  34 ParticleSystem::~ParticleSystem()
  35 {
  36     std::vector<Particle*>::iterator i;
  37     for(i = particles.begin(); i != particles.end(); ++i) {
  38         delete *i;
  39     }
  40 }
  41
  42 void ParticleSystem::draw(float scrollx, float scrolly, int layer)
  43 {
  44     std::vector<Particle*>::iterator i;
  45     for(i = particles.begin(); i != particles.end(); ++i) {
  46         Particle* particle = *i;
  47         if(particle->layer != layer)
  48             continue;
  49
  50         // remap x,y coordinates onto screencoordinates
  51         float x = fmodf(particle->x - scrollx, virtual_width);
  52         if(x < 0) x += virtual_width;
  53         float y = fmodf(particle->y - scrolly, virtual_height);
  54         if(y < 0) y += virtual_height;
  55         float xmax = fmodf(x + particle->texture->w, virtual_width);
  56         float ymax = fmodf(y + particle->texture->h, virtual_height);
  57
  58         // particle on screen
  59         if(x >= screen->w && xmax >= screen->w)
  60             continue;
  61         if(y >= screen->h && ymax >= screen->h)
  62             continue;
  63
  64         if(x > screen->w) x -= virtual_width;
  65         if(y > screen->h) y -= virtual_height;
  66         particle->texture->draw(x, y);
  67     }
  68 }
  69
  70 SnowParticleSystem::SnowParticleSystem()
  71 {
  72     snowimages[0] = new Surface(datadir+"/images/shared/snow0.png", USE_ALPHA);
  73     snowimages[1] = new Surface(datadir+"/images/shared/snow1.png", USE_ALPHA);
  74     snowimages[2] = new Surface(datadir+"/images/shared/snow2.png", USE_ALPHA);
  75
  76     virtual_width = screen->w * 2;
  77
  78     // create some random snowflakes
  79     size_t snowflakecount = size_t(virtual_width/10.0);
  80     for(size_t i=0; i<snowflakecount; ++i) {
  81         SnowParticle* particle = new SnowParticle;
  82         particle->x = rand() % int(virtual_width);
  83         particle->y = rand() % screen->h;
  84         particle->layer = i % 2;
  85         int snowsize = rand() % 3;
  86         particle->texture = snowimages[snowsize];
  87         do {
  88             particle->speed = snowsize/60.0 + (float(rand()%10)/300.0);
  89         } while(particle->speed < 0.01);
  90         particle->speed *= World::current()->get_level()->gravity;
  91
  92         particles.push_back(particle);
  93     }
  94 }
  95
  96 SnowParticleSystem::~SnowParticleSystem()
  97 {
  98   for(int i=0;i<3;++i)
  99     delete snowimages[i];
 100 }
 101
 102 void SnowParticleSystem::simulate(float elapsed_time)
 103 {
 104     std::vector<Particle*>::iterator i;
 105     for(i = particles.begin(); i != particles.end(); ++i) {
 106         SnowParticle* particle = (SnowParticle*) *i;
 107         particle->y += particle->speed * elapsed_time;
 108         if(particle->y > screen->h) {
 109             particle->y = fmodf(particle->y , virtual_height);
 110             particle->x = rand() % int(virtual_width);
 111         }
 112     }
 113 }
 114
 115 CloudParticleSystem::CloudParticleSystem()
 116 {
 117     cloudimage = new Surface(datadir + "/images/shared/cloud.png", USE_ALPHA);
 118
 119     virtual_width = 2000.0;
 120
 121     // create some random clouds
 122     for(size_t i=0; i<15; ++i) {
 123         CloudParticle* particle = new CloudParticle;
 124         particle->x = rand() % int(virtual_width);
 125         particle->y = rand() % int(virtual_height);
 126         particle->layer = 0;
 127         particle->texture = cloudimage;
 128         particle->speed = -float(250 + rand() % 200) / 1000.0;
 129
 130         particles.push_back(particle);
 131     }
 132 }
 133
 134 CloudParticleSystem::~CloudParticleSystem()
 135 {
 136   delete cloudimage;
 137 }
 138
 139 void CloudParticleSystem::simulate(float elapsed_time)
 140 {
 141     std::vector<Particle*>::iterator i;
 142     for(i = particles.begin(); i != particles.end(); ++i) {
 143         CloudParticle* particle = (CloudParticle*) *i;
 144         particle->x += particle->speed * elapsed_time;
 145     }
 146 }