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particle.h
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particle.h
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#ifndef PARTICLE_H
#define PARTICLE_H
#include <SFML/System/Vector2.hpp>
#include <SFML/System/Clock.hpp>
#include <SFML/Graphics/Color.hpp>
#include <SFML/Graphics/Image.hpp>
#include <SFML/Graphics/Sprite.hpp>
#include <SFML/Graphics/Texture.hpp>
#include <vector>
#include <random>
class Randomizer {
public:
Randomizer() : device_(), engine_(device_()){};
int rnd(int a, int b) {
std::uniform_int_distribution<int> uni_dist(a, b);
return uni_dist(engine_);
};
double rnd(double a, double b) {
std::uniform_real_distribution<double> uni_dist(a, b);
return uni_dist(engine_);
};
private:
std::random_device device_;
std::default_random_engine engine_;
};
namespace Shape { enum { CIRCLE, SQUARE }; }
struct Particle
{
sf::Vector2f pos; // Position
sf::Vector2f vel; // Velocity
sf::Color color; // RGBA
};
typedef std::vector<Particle*>::iterator ParticleIterator;
class ParticleSystem
{
public:
ParticleSystem( int width, int height );
~ParticleSystem();
void fuel( int particles ); // Adds new particles to m_particles
void update(); // Updates position, velocity and opacity of all particles
void render(); // Renders all particles onto m_image
void remove(); // Removes all particles from m_image
void setPosition( float x, float y ) { m_position.x = x; m_position.y = y; }
void setGravity( float x, float y ) { m_gravity.x = x; m_gravity.y = y; }
void setParticleSpeed( float speed ) { m_particleSpeed = speed; }
void setDissolve( bool enable ) { m_dissolve = enable; }
void setDissolutionRate( unsigned char rate ) { m_dissolutionRate = rate; }
void setShape( unsigned char shape ) { m_shape = shape; }
int getNumberOfParticles() { return m_particles.size(); }
std::string getNumberOfParticlesString();
sf::Sprite& getSprite() { return m_sprite; }
private:
sf::Vector2f m_position; // Particle origin (pixel co-ordinates)
sf::Vector2f m_gravity; // Affects particle velocities
sf::Clock m_clock; // Used to scale particle motion
sf::Color m_transparent; // sf::Color( 0, 0, 0, 0 )
sf::Image m_image; // See render() and remove()
sf::Texture m_texture;
Randomizer m_randomizer;
sf::Sprite m_sprite; // Connected to m_image
float m_particleSpeed;// Pixels per second (at most)
bool m_dissolve; // Dissolution enabled?
unsigned char m_dissolutionRate;
unsigned char m_shape;
std::vector<Particle*> m_particles;
};
#endif

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