n_particles.c File Reference

particle function file for SantaHack 2012 More...

#include "nilorea/n_particles.h"
#include "math.h"

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Functions
static ALLEGRO_COLOR	_color_lerp (ALLEGRO_COLOR a, ALLEGRO_COLOR b, float t)
	helper to linearly interpolate a color
static void	_emitter_shape_offset (const PARTICLE_EMITTER *em, double *out_x, double *out_y)
	compute shape-offset spawn position for an emitter
static double	_particle_rand_range (double vmin, double vmax)
	helper to generate a random double between min and max
static int	_particle_rand_range_i (int imin, int imax)
	helper to generate a random int between min and max (inclusive)
PARTICLE_EMITTER *	add_emitter (PARTICLE_SYSTEM *psys)
	add a new emitter to the particle system
int	add_particle (PARTICLE_SYSTEM *psys, int spr, int mode, int lifetime, int size, ALLEGRO_COLOR color, PHYSICS object)
	add a particle to a particle system
int	add_particle_at (PARTICLE_SYSTEM *psys, int spr, int mode, double px, double py, double pz, int lifetime, int size_start, int size_end, ALLEGRO_COLOR color_start, ALLEGRO_COLOR color_end, double vx, double vy, double vz, double ax, double ay, double az)
	add a particle at an absolute world position (not relative to psys->source)
int	add_particle_ex (PARTICLE_SYSTEM *psys, int spr, int mode, int off_x, int off_y, int lifetime, int size, ALLEGRO_COLOR color, double vx, double vy, double vz, double ax, double ay, double az)
	add a particle to a particle system, all in line version (you have to set the PHYSICS object parameter in the function parameter instead of providing a PHYSICS object)
int	draw_particle (PARTICLE_SYSTEM *psys, double xpos, double ypos, int w, int h, double range)
	draw particles of a particle system
int	free_emitters (PARTICLE_SYSTEM *psys)
	free all emitters in the particle system
int	free_particle_system (PARTICLE_SYSTEM **psys)
	destroy and free a particle system
int	init_particle_system (PARTICLE_SYSTEM **psys, int max, double x, double y, double z, int max_sprites)
	initialize a particle system
int	manage_particle (PARTICLE_SYSTEM *psys)
	update particles positions using particle system internal timer
int	manage_particle_ex (PARTICLE_SYSTEM *psys, double delta_t)
	update particles positions using provided delta time
int	move_particles (PARTICLE_SYSTEM *psys, double vx, double vy, double vz)
	move all particles of a particle system by a given offset
int	remove_emitter (PARTICLE_SYSTEM *psys, const PARTICLE_EMITTER *em)
	remove an emitter from the particle system and free it

Detailed Description

particle function file for SantaHack 2012

Author

Castagnier Mickael aka Gull Ra Driel

Version

1.0

Date

20/12/2012

Definition in file n_particles.c.

Function Documentation

_color_lerp()

static ALLEGRO_COLOR _color_lerp ( ALLEGRO_COLOR  a, ALLEGRO_COLOR  b, float  t  )

static

helper to linearly interpolate a color

Parameters

a	start color
b	end color
t	interpolation factor [0..1]

Returns

interpolated color

Definition at line 225 of file n_particles.c.

Referenced by manage_particle_ex().

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_emitter_shape_offset()

static void _emitter_shape_offset ( const PARTICLE_EMITTER *  em, double *  out_x, double *  out_y  )

static

compute shape-offset spawn position for an emitter

Parameters

em	the emitter
out_x	output x offset
out_y	output y offset

Definition at line 157 of file n_particles.c.

References PARTICLE_EMITTER::shape, PARTICLE_EMITTER::shape_h, PARTICLE_EMITTER::shape_rotation, and PARTICLE_EMITTER::shape_w.

Referenced by manage_particle_ex().

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_particle_rand_range()

static double _particle_rand_range ( double  vmin, double  vmax  )

static

helper to generate a random double between min and max

Parameters

vmin	minimum value
vmax	maximum value

Returns

random value in [vmin, vmax]

Definition at line 202 of file n_particles.c.

Referenced by manage_particle_ex().

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_particle_rand_range_i()

static int _particle_rand_range_i ( int  imin, int  imax  )

static

helper to generate a random int between min and max (inclusive)

Parameters

imin	minimum value
imax	maximum value

Returns

random value in [imin, imax]

Definition at line 213 of file n_particles.c.

Referenced by manage_particle_ex().

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