4 // Copyright (C) 2004 Matthias Braun <matze@braunis.de>
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.
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.
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"
28 ParticleSystem::ParticleSystem()
30 virtual_width = screen->w;
31 virtual_height = screen->h;
34 ParticleSystem::~ParticleSystem()
36 std::vector<Particle*>::iterator i;
37 for(i = particles.begin(); i != particles.end(); ++i) {
42 void ParticleSystem::draw(float scrollx, float scrolly, int layer)
44 std::vector<Particle*>::iterator i;
45 for(i = particles.begin(); i != particles.end(); ++i) {
46 Particle* particle = *i;
47 if(particle->layer != layer)
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);
59 if(x >= screen->w && xmax >= screen->w)
61 if(y >= screen->h && ymax >= screen->h)
64 if(x > screen->w) x -= virtual_width;
65 if(y > screen->h) y -= virtual_height;
66 texture_draw(particle->texture, x, y);
70 SnowParticleSystem::SnowParticleSystem()
72 texture_load(&snowimages[0], datadir+"/images/shared/snow0.png", USE_ALPHA);
73 texture_load(&snowimages[1], datadir+"/images/shared/snow1.png", USE_ALPHA);
74 texture_load(&snowimages[2], datadir+"/images/shared/snow2.png", USE_ALPHA);
76 virtual_width = screen->w * 2;
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];
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;
92 particles.push_back(particle);
96 SnowParticleSystem::~SnowParticleSystem()
99 texture_free(&snowimages[i]);
102 void SnowParticleSystem::simulate(float elapsed_time)
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);
115 CloudParticleSystem::CloudParticleSystem()
117 texture_load(&cloudimage, datadir + "/images/shared/cloud.png", USE_ALPHA);
119 virtual_width = 2000.0;
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);
127 particle->texture = &cloudimage;
128 particle->speed = -float(250 + rand() % 200) / 1000.0;
130 particles.push_back(particle);
134 CloudParticleSystem::~CloudParticleSystem()
136 texture_free(&cloudimage);
139 void CloudParticleSystem::simulate(float elapsed_time)
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;