src/object/particlesystem.cpp

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//  SuperTux
//  Copyright (C) 2006 Matthias Braun <matze@braunis.de>
//
//  This program is free software: you can redistribute it and/or modify
//  it under the terms of the GNU General Public License as published by
//  the Free Software Foundation, either version 3 of the License, or
//  (at your option) any later version.
//
//  This program is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//  GNU General Public License for more details.
//
//  You should have received a copy of the GNU General Public License
//  along with this program.  If not, see <http://www.gnu.org/licenses/>.

#include "object/particlesystem.hpp"

#include <math.h>

#include "math/random_generator.hpp"
#include "supertux/globals.hpp"
#include "video/drawing_context.hpp"

ParticleSystem::ParticleSystem(float max_particle_size) :
  max_particle_size(max_particle_size),
  z_pos(),
  particles(),
  virtual_width(),
  virtual_height()
{
  virtual_width = SCREEN_WIDTH + max_particle_size * 2;
  virtual_height = SCREEN_HEIGHT + max_particle_size *2;
  z_pos = LAYER_BACKGROUND1;
}

ParticleSystem::~ParticleSystem()
{
  std::vector<Particle*>::iterator i;
  for(i = particles.begin(); i != particles.end(); ++i) {
    delete *i;
  }
}

void ParticleSystem::draw(DrawingContext& context)
{
  float scrollx = context.get_translation().x;
  float scrolly = context.get_translation().y;

  context.push_transform();
  context.set_translation(Vector(max_particle_size,max_particle_size));

  std::vector<Particle*>::iterator i;
  for(i = particles.begin(); i != particles.end(); ++i) {
    Particle* particle = *i;

    // remap x,y coordinates onto screencoordinates
    Vector pos;

    pos.x = fmodf(particle->pos.x - scrollx, virtual_width);
    if(pos.x < 0) pos.x += virtual_width;

    pos.y = fmodf(particle->pos.y - scrolly, virtual_height);
    if(pos.y < 0) pos.y += virtual_height;

    //if(pos.x > virtual_width) pos.x -= virtual_width;
    //if(pos.y > virtual_height) pos.y -= virtual_height;

    context.draw_surface(particle->texture, pos, particle->angle, Color(1.0f, 1.0f, 1.0f), Blend(), z_pos);
  }

  context.pop_transform();
}

/* EOF */

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