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/*
* File: los.h
* Summary: Line-of-sight algorithm.
*/
#ifndef LOS_H
#define LOS_H
#include "env.h"
#include "los_def.h"
#include "losparam.h"
#define EPSILON_VALUE 0.00001
bool double_is_zero(const double x);
void set_los_radius(int r);
int get_los_radius_sq(); // XXX
struct ray_def;
bool find_ray(const coord_def& source, const coord_def& target,
ray_def& ray, const opacity_func &opc = opc_solid,
const bounds_func &bds = bds_default, bool cycle = false);
bool exists_ray(const coord_def& source, const coord_def& target,
const opacity_func &opc = opc_solid,
const bounds_func &bds = bds_default);
dungeon_feature_type ray_blocker(const coord_def& source, const coord_def& target);
void fallback_ray(const coord_def& source, const coord_def& target,
ray_def& ray);
int num_feats_between(const coord_def& source, const coord_def& target,
dungeon_feature_type min_feat,
dungeon_feature_type max_feat,
bool exclude_endpoints = true,
bool just_check = false);
bool cell_see_cell(const coord_def& p1, const coord_def& p2);
void clear_rays_on_exit();
void losight(env_show_grid& sh, const coord_def& center,
const opacity_func &opc = opc_default,
const bounds_func &bds = bds_default);
void losight(env_show_grid& sh, const los_param& param);
void calc_show_los();
bool see_cell(const env_show_grid &show,
const coord_def &c,
const coord_def &pos );
bool observe_cell(const coord_def &p);
bool see_cell_no_trans( const coord_def &p );
bool trans_wall_blocking( const coord_def &p );
#endif
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