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particlesystem.cpp
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particlesystem.cpp
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#include "particle.h"
#include <sstream>
ParticleSystem::ParticleSystem( int width, int height )
{
m_transparent = sf::Color( 0, 0, 0, 0 );
m_image.create( width, height, m_transparent );
m_texture.loadFromImage(m_image);
m_sprite = sf::Sprite(m_texture);
m_position.x = 0.5f * width;
m_position.y = 0.5f * height;
m_particleSpeed = 20.0f;
m_dissolve = false;
m_dissolutionRate = 4;
m_shape = Shape::CIRCLE;
}
ParticleSystem::~ParticleSystem()
{
for( ParticleIterator it = m_particles.begin(); it != m_particles.end(); ++it )
for( ParticleIterator it = m_particles.begin(); it != m_particles.end(); ++it )
{
delete *it;
}
}
void ParticleSystem::fuel( int particles )
{
float angle;
for( int i = 0; i < particles; i++ )
{
Particle* particle;
particle = new Particle();
particle->pos.x = m_position.x;
particle->pos.y = m_position.y;
switch( m_shape )
{
case Shape::CIRCLE:
angle = m_randomizer.rnd(0.0f, 6.2832f);
particle->vel.x = m_randomizer.rnd(0.0f, cos( angle ));
particle->vel.y = m_randomizer.rnd(0.0f, sin( angle ));
break;
case Shape::SQUARE:
particle->vel.x = m_randomizer.rnd(-1.0f, 1.0f);
particle->vel.y = m_randomizer.rnd(-1.0f, 1.0f);
break;
default:
particle->vel.x = 0.5f; // Easily detected
particle->vel.y = 0.5f; // Easily detected
}
if( particle->vel.x == 0.0f && particle->vel.y == 0.0f )
{
delete particle;
continue;
}
particle->color.r = m_randomizer.rnd(0, 255);
particle->color.g = m_randomizer.rnd(0, 255);
particle->color.b = m_randomizer.rnd(0, 255);
particle->color.a = 255;
m_particles.push_back( particle );
}
}
void ParticleSystem::update()
{
float time = m_clock.restart().asSeconds();
for( ParticleIterator it = m_particles.begin(); it != m_particles.end(); ++it )
{
(*it)->vel.x += m_gravity.x * time;
(*it)->vel.y += m_gravity.y * time;
(*it)->pos.x += (*it)->vel.x * time * m_particleSpeed;
(*it)->pos.y += (*it)->vel.y * time * m_particleSpeed;
if( m_dissolve ) (*it)->color.a -= m_dissolutionRate;
if( (*it)->pos.x > m_image.getSize().x || (*it)->pos.x < 0 || (*it)->pos.y > m_image.getSize().y || (*it)->pos.y < 0 || (*it)->color.a < 10 )
{
delete (*it);
it = m_particles.erase( it );
if( it == m_particles.end() ) return;
}
}
}
void ParticleSystem::render()
{
for( ParticleIterator it = m_particles.begin(); it != m_particles.end(); ++it )
{
m_image.setPixel( (int)(*it)->pos.x, (int)(*it)->pos.y, (*it)->color );
}
m_texture.update(m_image);
}
void ParticleSystem::remove()
{
for( ParticleIterator it = m_particles.begin(); it != m_particles.end(); ++it )
{
m_image.setPixel( (int)(*it)->pos.x, (int)(*it)->pos.y, m_transparent );
}
}
std::string ParticleSystem::getNumberOfParticlesString()
{
std::ostringstream oss;
oss << m_particles.size();
return oss.str();
}

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particlesystem.cpp (3 KB)

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