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/*
* File: ray.h
* Summary: Ray definition
* Written by: Linley Henzell
*
* Modified for Crawl Reference by $Author$ on $Date$
*
* Change History (most recent first):
*
* <1> 7/11/07 MPC Split off from externs.h
*/
#ifndef RAY_H
#define RAY_H
struct ray_def
{
public:
double accx;
double accy;
double slope;
// Quadrant 1: down-right
// Quadrant 2: down-left
// Quadrant 3: up-left
// Quadrant 4: up-right
int quadrant;
int fullray_idx; // for cycling: where did we come from?
public:
ray_def();
int x() const { return static_cast<int>(accx); }
int y() const { return static_cast<int>(accy); }
coord_def pos() const { return coord_def(x(), y()); }
// returns the direction taken (0,1,2)
int advance(bool shorten = false, const coord_def *p = NULL);
int advance_through(const coord_def &point);
void advance_and_bounce();
void regress();
private:
int raw_advance();
double reflect(bool x, double oldc, double newc) const;
double reflect(double x, double c) const;
void set_reflect_point(const double oldx, const double oldy,
double *newx, double *newy,
bool blocked_x, bool blocked_y);
};
#endif
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