src/object/rain_particle_system.cpp

   1 //  SuperTux
   2 //  Copyright (C) 2006 Matthias Braun <matze@braunis.de>
   3 //
   4 //  This program is free software: you can redistribute it and/or modify
   5 //  it under the terms of the GNU General Public License as published by
   6 //  the Free Software Foundation, either version 3 of the License, or
   7 //  (at your option) any later version.
   8 //
   9 //  This program is distributed in the hope that it will be useful,
  10 //  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 //  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 //  GNU General Public License for more details.
  13 //
  14 //  You should have received a copy of the GNU General Public License
  15 //  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16
  17 #include "object/rain_particle_system.hpp"
  18
  19 #include "math/random_generator.hpp"
  20 #include "object/camera.hpp"
  21 #include "object/rainsplash.hpp"
  22 #include "util/reader.hpp"
  23
  24 RainParticleSystem::RainParticleSystem()
  25 {
  26   rainimages[0] = Surface::create("images/objects/particles/rain0.png");
  27   rainimages[1] = Surface::create("images/objects/particles/rain1.png");
  28
  29   virtual_width = SCREEN_WIDTH * 2;
  30
  31   // create some random raindrops
  32   size_t raindropcount = size_t(virtual_width/6.0);
  33   for(size_t i=0; i<raindropcount; ++i) {
  34     RainParticle* particle = new RainParticle;
  35     particle->pos.x = graphicsRandom.rand(int(virtual_width));
  36     particle->pos.y = graphicsRandom.rand(int(virtual_height));
  37     int rainsize = graphicsRandom.rand(2);
  38     particle->texture = rainimages[rainsize];
  39     do {
  40       particle->speed = (rainsize+1)*45 + graphicsRandom.randf(3.6);
  41     } while(particle->speed < 1);
  42     particle->speed *= 10; // gravity
  43
  44     particles.push_back(particle);
  45   }
  46 }
  47
  48 void
  49 RainParticleSystem::parse(const Reader& reader)
  50 {
  51   z_pos = reader_get_layer (reader, /* default = */ LAYER_BACKGROUND1);
  52 }
  53
  54 RainParticleSystem::~RainParticleSystem()
  55 {
  56 }
  57
  58 void RainParticleSystem::update(float elapsed_time)
  59 {
  60   std::vector<Particle*>::iterator i;
  61   for(
  62     i = particles.begin(); i != particles.end(); ++i) {
  63     RainParticle* particle = (RainParticle*) *i;
  64     float movement = particle->speed * elapsed_time;
  65     float abs_x = Sector::current()->camera->get_translation().x;
  66     float abs_y = Sector::current()->camera->get_translation().y;
  67     particle->pos.y += movement;
  68     particle->pos.x -= movement;
  69     int col = collision(particle, Vector(-movement, movement));
  70     if ((particle->pos.y > SCREEN_HEIGHT + abs_y) || (col >= 0)) {
  71       //Create rainsplash
  72       if ((particle->pos.y <= SCREEN_HEIGHT + abs_y) && (col >= 1)){
  73         bool vertical = (col == 2);
  74         if (!vertical) { //check if collision happened from above
  75           int splash_x, splash_y; // move outside if statement when
  76                                   // uncommenting the else statement below.
  77           splash_x = int(particle->pos.x);
  78           splash_y = int(particle->pos.y) - (int(particle->pos.y) % 32) + 32;
  79           Sector::current()->add_object(std::make_shared<RainSplash>(Vector(splash_x, splash_y),vertical));
  80         }
  81         // Uncomment the following to display vertical splashes, too
  82         /* else {
  83            splash_x = int(particle->pos.x) - (int(particle->pos.x) % 32) + 32;
  84            splash_y = int(particle->pos.y);
  85            Sector::current()->add_object(new RainSplash(Vector(splash_x, splash_y),vertical));
  86            } */
  87       }
  88       int new_x = graphicsRandom.rand(int(virtual_width)) + int(abs_x);
  89       int new_y = 0;
  90       //FIXME: Don't move particles over solid tiles
  91       particle->pos.x = new_x;
  92       particle->pos.y = new_y;
  93     }
  94   }
  95 }
  96
  97 /* EOF */