static void cast_ray(map_t *map, int xo, int yo, int xd, int yd, int r2,bool light_walls) {
int curx=xo,cury=yo;
bool in=false;
bool blocked=false;
bool end=false;
int offset;
TCOD_line_init(xo,yo,xd,yd);
offset=curx+cury*map->width;
if ( 0 <= offset && offset < map->nbcells ) {
in=true;
map->cells[offset].fov=1;
}
while (!end) {
end = TCOD_line_step(&curx,&cury); /* reached xd,yd */
offset=curx+cury*map->width;
if ( r2 > 0 ) {
/* check radius */
int cur_radius=(curx-xo)*(curx-xo)+(cury-yo)*(cury-yo);
if ( cur_radius > r2 ) return;
}
if ( 0 <= offset && offset < map->nbcells ) {
in=true;
if ( !blocked && ! map->cells[offset].transparent ) {
blocked=true;
} else if ( blocked ) {
return; /* wall */
}
if ( light_walls || ! blocked ) map->cells[offset].fov=1;
} else if (in) return; /* ray out of map */
}
}
// ********** bresenham line drawing **********
void TCODLine::init(int xFrom, int yFrom, int xTo, int yTo) {
TCOD_line_init(xFrom,yFrom,xTo,yTo);
}
