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 #include "viewport.h"
  29 #include "display_manager.h"
  30
  31 ParticleSystem::ParticleSystem(DisplayManager& displaymanager)
  32 {
  33     virtual_width = screen->w;
  34     virtual_height = screen->h;
  35
  36     displaymanager.add_drawable(this, 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(ViewPort& viewport, int layer)
  48 {
  49     std::vector<Particle*>::iterator i;
  50     for(i = particles.begin(); i != particles.end(); ++i) {
  51         Particle* particle = *i;
  52         if(particle->layer != layer)
  53             continue;
  54
  55         float scrollx = viewport.get_translation().x;
  56         float scrolly = viewport.get_translation().y;
  57
  58         // remap x,y coordinates onto screencoordinates
  59         float x = fmodf(particle->x - scrollx, virtual_width);
  60         if(x < 0) x += virtual_width;
  61         float y = fmodf(particle->y - scrolly, virtual_height);
  62         if(y < 0) y += virtual_height;
  63         float xmax = fmodf(x + particle->texture->w, virtual_width);
  64         float ymax = fmodf(y + particle->texture->h, virtual_height);
  65
  66         // particle on screen
  67         if(x >= screen->w && xmax >= screen->w)
  68             continue;
  69         if(y >= screen->h && ymax >= screen->h)
  70             continue;
  71
  72         if(x > screen->w) x -= virtual_width;
  73         if(y > screen->h) y -= virtual_height;
  74         particle->texture->draw(x, y);
  75     }
  76 }
  77
  78 SnowParticleSystem::SnowParticleSystem(DisplayManager& displaymanager)
  79   : ParticleSystem(displaymanager)
  80 {
  81     snowimages[0] = new Surface(datadir+"/images/shared/snow0.png", USE_ALPHA);
  82     snowimages[1] = new Surface(datadir+"/images/shared/snow1.png", USE_ALPHA);
  83     snowimages[2] = new Surface(datadir+"/images/shared/snow2.png", USE_ALPHA);
  84
  85     virtual_width = screen->w * 2;
  86
  87     // create some random snowflakes
  88     size_t snowflakecount = size_t(virtual_width/10.0);
  89     for(size_t i=0; i<snowflakecount; ++i) {
  90         SnowParticle* particle = new SnowParticle;
  91         particle->x = rand() % int(virtual_width);
  92         particle->y = rand() % screen->h;
  93         particle->layer = LAYER_BACKGROUND1;
  94         int snowsize = rand() % 3;
  95         particle->texture = snowimages[snowsize];
  96         do {
  97             particle->speed = snowsize/60.0 + (float(rand()%10)/300.0);
  98         } while(particle->speed < 0.01);
  99         particle->speed *= World::current()->get_level()->gravity;
 100
 101         particles.push_back(particle);
 102     }
 103 }
 104
 105 SnowParticleSystem::~SnowParticleSystem()
 106 {
 107   for(int i=0;i<3;++i)
 108     delete snowimages[i];
 109 }
 110
 111 void SnowParticleSystem::action(float elapsed_time)
 112 {
 113     std::vector<Particle*>::iterator i;
 114     for(i = particles.begin(); i != particles.end(); ++i) {
 115         SnowParticle* particle = (SnowParticle*) *i;
 116         particle->y += particle->speed * elapsed_time;
 117         if(particle->y > screen->h) {
 118             particle->y = fmodf(particle->y , virtual_height);
 119             particle->x = rand() % int(virtual_width);
 120         }
 121     }
 122 }
 123
 124 CloudParticleSystem::CloudParticleSystem(DisplayManager& displaymanager)
 125   : ParticleSystem(displaymanager)
 126 {
 127     cloudimage = new Surface(datadir + "/images/shared/cloud.png", USE_ALPHA);
 128
 129     virtual_width = 2000.0;
 130
 131     // create some random clouds
 132     for(size_t i=0; i<15; ++i) {
 133         CloudParticle* particle = new CloudParticle;
 134         particle->x = rand() % int(virtual_width);
 135         particle->y = rand() % int(virtual_height);
 136         particle->layer = LAYER_BACKGROUND1;
 137         particle->texture = cloudimage;
 138         particle->speed = -float(250 + rand() % 200) / 1000.0;
 139
 140         particles.push_back(particle);
 141     }
 142 }
 143
 144 CloudParticleSystem::~CloudParticleSystem()
 145 {
 146   delete cloudimage;
 147 }
 148
 149 void CloudParticleSystem::action(float elapsed_time)
 150 {
 151     std::vector<Particle*>::iterator i;
 152     for(i = particles.begin(); i != particles.end(); ++i) {
 153         CloudParticle* particle = (CloudParticle*) *i;
 154         particle->x += particle->speed * elapsed_time;
 155     }
 156 }