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#ifndef __NR_LIGHT_H__
#define __NR_LIGHT_H__
/** \file
* These classes provide tools to compute interesting objects relative to light
* sources. Each class provides a constructor converting information contained
* in a sp light object into information useful in the current setting, a
* method to get the light vector (at a given point) and a method to get the
* light color components (at a given point).
*/
#include <gdk/gdk.h>
#include "display/nr-3dutils.h"
#include "display/nr-light-types.h"
#include <2geom/forward.h>
struct SPFeDistantLight;
struct SPFePointLight;
struct SPFeSpotLight;
namespace Inkscape {
namespace Filters {
enum LightComponent {
LIGHT_RED = 0,
LIGHT_GREEN,
LIGHT_BLUE
};
class DistantLight {
public:
/**
* Constructor
*
* \param light the sp light object
* \param lighting_color the lighting_color used
*/
DistantLight(SPFeDistantLight *light, guint32 lighting_color);
virtual ~DistantLight();
/**
* Computes the light vector of the distant light
*
* \param v a Fvector referece where we store the result
*/
void light_vector(NR::Fvector &v);
/**
* Computes the light components of the distant light
*
* \param lc a Fvector referece where we store the result, X=R, Y=G, Z=B
*/
void light_components(NR::Fvector &lc);
private:
guint32 color;
gdouble azimuth; //azimuth in rad
gdouble elevation; //elevation in rad
};
class PointLight {
public:
/**
* Constructor
*
* \param light the sp light object
* \param lighting_color the lighting_color used
* \param trans the transformation between absolute coordinate (those
* employed in the sp light object) and current coordinate (those
* employed in the rendering)
*/
PointLight(SPFePointLight *light, guint32 lighting_color, const Geom::Affine &trans);
virtual ~PointLight();
/**
* Computes the light vector of the distant light at point (x,y,z).
* x, y and z are given in the arena_item coordinate, they are used as
* is
*
* \param v a Fvector referece where we store the result
* \param x x coordinate of the current point
* \param y y coordinate of the current point
* \param z z coordinate of the current point
*/
void light_vector(NR::Fvector &v, gdouble x, gdouble y, gdouble z);
/**
* Computes the light components of the distant light
*
* \param lc a Fvector referece where we store the result, X=R, Y=G, Z=B
*/
void light_components(NR::Fvector &lc);
private:
guint32 color;
//light position coordinates in render setting
gdouble l_x;
gdouble l_y;
gdouble l_z;
};
class SpotLight {
public:
/**
* Constructor
*
* \param light the sp light object
* \param lighting_color the lighting_color used
* \param trans the transformation between absolute coordinate (those
* employed in the sp light object) and current coordinate (those
* employed in the rendering)
*/
SpotLight(SPFeSpotLight *light, guint32 lighting_color, const Geom::Affine &trans);
virtual ~SpotLight();
/**
* Computes the light vector of the distant light at point (x,y,z).
* x, y and z are given in the arena_item coordinate, they are used as
* is
*
* \param v a Fvector referece where we store the result
* \param x x coordinate of the current point
* \param y y coordinate of the current point
* \param z z coordinate of the current point
*/
void light_vector(NR::Fvector &v, gdouble x, gdouble y, gdouble z);
/**
* Computes the light components of the distant light at the current
* point. We only need the light vector to compute theses
*
* \param lc a Fvector referece where we store the result, X=R, Y=G, Z=B
* \param L the light vector of the current point
*/
void light_components(NR::Fvector &lc, const NR::Fvector &L);
private:
guint32 color;
//light position coordinates in render setting
gdouble l_x;
gdouble l_y;
gdouble l_z;
gdouble cos_lca; //cos of the limiting cone angle
gdouble speExp; //specular exponent;
NR::Fvector S; //unit vector from light position in the direction
//the spot point at
};
} /* namespace Filters */
} /* namespace Inkscape */
#endif // __NR_LIGHT_H__
/*
Local Variables:
mode:c++
c-file-style:"stroustrup"
c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
indent-tabs-mode:nil
fill-column:99
End:
*/
// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
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