Particles Class Reference

#include <particles.hpp>

Inherits GameObject.

List of all members.

Public Member Functions
	Particles (const Vector &epicenter, int min_angle, int max_angle, const Vector &initial_velocity, const Vector &acceleration, int number, Color color, int size, float life_time, int drawing_layer)
	~Particles ()
virtual void	update (float elapsed_time)
	This function is called once per frame and allows the object to update it's state.
virtual void	draw (DrawingContext &context)
	The GameObject should draw itself onto the provided DrawingContext if this function is called.
Private Attributes
Vector	accel
Timer	timer
bool	live_forever
Color	color
float	size
int	drawing_layer
std::vector< Particle * >	particles
Classes
struct	Particle

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Detailed Description

Definition at line 25 of file particles.hpp.

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Constructor & Destructor Documentation

Particles::Particles	(	const Vector &	epicenter,
		int	min_angle,
		int	max_angle,
		const Vector &	initial_velocity,
		const Vector &	acceleration,
		int	number,
		Color	color,
		int	size,
		float	life_time,
		int	drawing_layer
	)

Definition at line 27 of file particles.cpp.

References graphicsRandom, live_forever, particles, RandomGenerator::rand(), Timer::start(), timer, Vector::x, and Vector::y.

                                                                                   :
  accel(acceleration), 
  timer(),
  live_forever(),
  color(color_), 
  size(size_), 
  drawing_layer(drawing_layer_),
  particles()
{
  if(life_time == 0) {
    live_forever = true;
  } else {
    live_forever = false;
    timer.start(life_time);
  }

  // create particles
  for(int p = 0; p < number; p++)
  {
    Particle* particle = new Particle;
    particle->pos = epicenter;

    float angle = graphicsRandom.rand(min_angle, max_angle)
      * (M_PI / 180);  // convert to radius (radians?)
    particle->vel.x = /*fabs*/(sin(angle)) * initial_velocity.x;
    //    if(angle >= M_PI && angle < M_PI*2)
    //      particle->vel.x *= -1;  // work around to fix signal
    particle->vel.y = /*fabs*/(cos(angle)) * initial_velocity.y;
    //    if(angle >= M_PI_2 && angle < 3*M_PI_2)
    //      particle->vel.y *= -1;

    particles.push_back(particle);
  }
}

Particles::~Particles

(

)

Definition at line 64 of file particles.cpp.

References particles.

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

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Member Function Documentation

void Particles::update

(

float

elapsed_time

)

[virtual]

This function is called once per frame and allows the object to update it's state.

The elapsed_time is the time since the last frame in seconds and should be the base for all timed calculations (don't use SDL_GetTicks directly as this will fail in pause mode)

Implements GameObject.

Definition at line 73 of file particles.cpp.

References accel, Sector::camera, scripting::camera(), Timer::check(), Sector::current(), Camera::get_translation(), live_forever, particles, GameObject::remove_me(), SCREEN_HEIGHT, SCREEN_WIDTH, timer, Vector::x, and Vector::y.

{
  Vector camera = Sector::current()->camera->get_translation();

  // update particles
  for(std::vector<Particle*>::iterator i = particles.begin();
      i != particles.end(); ) {
    (*i)->pos.x += (*i)->vel.x * elapsed_time;
    (*i)->pos.y += (*i)->vel.y * elapsed_time;

    (*i)->vel.x += accel.x * elapsed_time;
    (*i)->vel.y += accel.y * elapsed_time;

    if((*i)->pos.x < camera.x || (*i)->pos.x > SCREEN_WIDTH + camera.x ||
       (*i)->pos.y < camera.y || (*i)->pos.y > SCREEN_HEIGHT + camera.y) {
      delete (*i);
      i = particles.erase(i);
    } else {
      ++i;
    }
  }

  if((timer.check() && !live_forever) || particles.size() == 0)
    remove_me();
}

void Particles::draw

(

DrawingContext &

context

)

[virtual]

The GameObject should draw itself onto the provided DrawingContext if this function is called.

Implements GameObject.

Definition at line 100 of file particles.cpp.

References color, DrawingContext::draw_filled_rect(), drawing_layer, particles, and size.

{
  // draw particles
  for(std::vector<Particle*>::iterator i = particles.begin();
      i != particles.end(); i++) {
    context.draw_filled_rect((*i)->pos, Vector(size,size), color,drawing_layer);
  }
}

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Member Data Documentation

Vector Particles::accel [private]

Definition at line 49 of file particles.hpp.

Referenced by update().

Timer Particles::timer [private]

Definition at line 50 of file particles.hpp.

Referenced by Particles(), and update().

bool Particles::live_forever [private]

Definition at line 51 of file particles.hpp.

Referenced by Particles(), and update().

Color Particles::color [private]

Definition at line 53 of file particles.hpp.

Referenced by draw().

float Particles::size [private]

Definition at line 54 of file particles.hpp.

Referenced by draw().

int Particles::drawing_layer [private]

Definition at line 55 of file particles.hpp.

Referenced by draw().

std::vector<Particle*> Particles::particles [private]

Definition at line 57 of file particles.hpp.

Referenced by draw(), Particles(), update(), and ~Particles().

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The documentation for this class was generated from the following files:

• src/object/particles.hpp
• src/object/particles.cpp

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