src/object/cloud_particle_system.cpp

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00001 //  SuperTux
00002 //  Copyright (C) 2006 Matthias Braun <matze@braunis.de>
00003 //
00004 //  This program is free software: you can redistribute it and/or modify
00005 //  it under the terms of the GNU General Public License as published by
00006 //  the Free Software Foundation, either version 3 of the License, or
00007 //  (at your option) any later version.
00008 //
00009 //  This program is distributed in the hope that it will be useful,
00010 //  but WITHOUT ANY WARRANTY; without even the implied warranty of
00011 //  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00012 //  GNU General Public License for more details.
00013 //
00014 //  You should have received a copy of the GNU General Public License
00015 //  along with this program.  If not, see <http://www.gnu.org/licenses/>.
00016 
00017 #include "object/cloud_particle_system.hpp"
00018 
00019 #include <math.h>
00020 
00021 #include "math/random_generator.hpp"
00022 #include "supertux/globals.hpp"
00023 #include "video/drawing_context.hpp"
00024 
00025 CloudParticleSystem::CloudParticleSystem() :
00026   ParticleSystem(128),
00027   cloudimage()
00028 {
00029   cloudimage = Surface::create("images/objects/particles/cloud.png");
00030 
00031   virtual_width = 2000.0;
00032 
00033   // create some random clouds
00034   for(size_t i=0; i<15; ++i) {
00035     CloudParticle* particle = new CloudParticle;
00036     particle->pos.x = graphicsRandom.rand(static_cast<int>(virtual_width));
00037     particle->pos.y = graphicsRandom.rand(static_cast<int>(virtual_height));
00038     particle->texture = cloudimage;
00039     particle->speed = -graphicsRandom.randf(25.0, 54.0);
00040 
00041     particles.push_back(particle);
00042   }
00043 }
00044 
00045 void
00046 CloudParticleSystem::parse(const Reader& reader)
00047 {
00048   z_pos = reader_get_layer (reader, /* default = */ LAYER_BACKGROUND1);
00049 }
00050 
00051 CloudParticleSystem::~CloudParticleSystem()
00052 {
00053 }
00054 
00055 void CloudParticleSystem::update(float elapsed_time)
00056 {
00057   std::vector<Particle*>::iterator i;
00058   for(i = particles.begin(); i != particles.end(); ++i) {
00059     CloudParticle* particle = (CloudParticle*) *i;
00060     particle->pos.x += particle->speed * elapsed_time;
00061   }
00062 }
00063 
00064 /* EOF */

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