simplemap.cpp

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#include "raytracer.h"

namespace RayTracer {
        using namespace std;


        bool Segment::ray_tracing(const double p[2], const double direction, 
                double& range, double &alpha) const {

                int found = segment_ray_tracing(this->p0, this->p1, p, direction, &range);

                if(found) {
                        alpha = segment_alpha(this->p0, this->p1);
        
                        /* alpha and direction should have versors with negative dot product */
                        if( cos(alpha)*cos(direction) + sin(alpha)*sin(direction) > 0 )
                                alpha = alpha + M_PI;

                        alpha = normalize_0_2PI(alpha);

                        return true;
                } else {
                        alpha = NAN;
                        return false;
                }               
        };

        bool Environment::ray_tracing(const double p[2], const double direction,  double& out_distance, double &out_alpha, int*stuff_id) const {
        
                int champion = -1;
                double champion_range, champion_alpha;
                for(size_t i=0;i<stuff.size();i++) {
                        Stuff * s = stuff.at(i);
                        
                        double range, alpha;
                        if(s->ray_tracing(p,direction,range,alpha)){
                                if(champion==-1 || range<champion_range) {
                                        champion = i;
                                        champion_range = range;
                                        champion_alpha = alpha;
                                }
                        }
                        
                }
                
                if(champion != -1) {
                        *stuff_id = champion;
                        out_distance = champion_range;
                        out_alpha = champion_alpha;
                
                        return true;
                } else {
                        return false;
                }
        }
} // namespace SimpleMap