sphere.h

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#ifndef SPHERE_H
#define SPHERE_H

#include "renderable.h"
#include "scene.h"
#include "xml_util.h"
#include <string>

#include "solidmaterial.h"

class Sphere;

Renderable * new_sphere(xmlNode * node);
void delete_sphere(Sphere * sphere);

class Sphere : public Renderable {

    protected:
        class StaticInit {
            public:
                StaticInit() {
                    log_debug("Registering 'sphere'");
                    RenderableFactory::get_instance()->registerPlugin("sphere", sigc::ptr_fun(new_sphere));
                    log_debug("Sphere registered.");
                }
        };
        static StaticInit m_init;

        double m_radius;

    public:

        Sphere( 
            Point3D center,
            double r)
            : m_radius(r)
        {
            log_debug("Creating a Sphere at (%0.2f, %0.2f, %0.2f) with a radius of %0.2f", center.x, center.y, center.z, r );

            m_center = center;

        }

        virtual ~Sphere();

        virtual bool collides_with(const Ray &ray, double &t) const;

        virtual Ray get_normal(const Point3D &p) const;
};

Renderable * new_sphere(xmlNode * node) {
    log_debug("Entering new_sphere()");
    Sphere * rv = NULL;

    xml_properties props = get_properties(node);

    if ( props.empty() == false ) {
        double radius   = (double)strtod(props["radius"   ].c_str(), NULL);

        if(props.find("center") != props.end()) {
            rv = new Sphere(Point3D(props["center"]), radius); 
        }
        else {
            double x = (double)strtod(props["x"].c_str(), NULL);
            double y = (double)strtod(props["y"].c_str(), NULL);
            double z = (double)strtod(props["z"].c_str(), NULL);
            rv = new Sphere(Point3D(x, y, z), radius);
        }
    }
    else {
        log_err("No properties specified for <sphere> tag.");
    }

    log_debug("Leaving new_sphere()");
    return dynamic_cast<Renderable *>(rv);
}

void delete_sphere(Sphere * sphere) {
    delete sphere, sphere = NULL;
}

#endif

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