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/*
* File: teleport.cc
* Summary: Functions related to teleportation and blinking.
*/
#include "AppHdr.h"
#include "teleport.h"
#include "cloud.h"
#include "coord.h"
#include "envmap.h"
#include "los.h"
#include "player.h"
#include "random.h"
#include "state.h"
#include "terrain.h"
#include "view.h"
bool random_near_space(const coord_def& origin, coord_def& target,
bool allow_adjacent, bool restrict_los,
bool forbid_dangerous, bool forbid_sanctuary)
{
// This might involve ray tracing (via num_feats_between()), so
// cache results to avoid duplicating ray traces.
#define RNS_OFFSET 6
#define RNS_WIDTH (2*RNS_OFFSET + 1)
FixedArray<bool, RNS_WIDTH, RNS_WIDTH> tried;
const coord_def tried_o = coord_def(RNS_OFFSET, RNS_OFFSET);
tried.init(false);
// Is the monster on the other side of a transparent wall?
const bool trans_wall_block = trans_wall_blocking(origin);
const bool origin_is_player = (you.pos() == origin);
int min_walls_between = 0;
// Skip ray tracing if possible.
if (trans_wall_block && !crawl_state.arena)
{
// XXX: you.pos() is invalid in the arena.
min_walls_between = num_feats_between(origin, you.pos(),
DNGN_CLEAR_ROCK_WALL,
DNGN_CLEAR_PERMAROCK_WALL);
}
for (int tries = 0; tries < 150; tries++)
{
coord_def p = coord_def(random2(RNS_WIDTH), random2(RNS_WIDTH));
if (tried(p))
continue;
else
tried(p) = true;
target = origin + (p - tried_o);
// Origin is not 'near'.
if (target == origin)
continue;
if (!in_bounds(target)
|| restrict_los && !you.see_cell(target)
|| grd(target) < DNGN_SHALLOW_WATER
|| actor_at(target)
|| !allow_adjacent && distance(origin, target) <= 2
|| forbid_sanctuary && is_sanctuary(target))
{
continue;
}
// Don't pick grids that contain a dangerous cloud.
if (forbid_dangerous)
{
const int cloud = env.cgrid(target);
if (cloud != EMPTY_CLOUD
&& is_damaging_cloud(env.cloud[cloud].type, true))
{
continue;
}
}
if (!trans_wall_block && !origin_is_player)
return (true);
// If the monster is on a visible square which is on the other
// side of one or more translucent walls from the player, then it
// can only blink through translucent walls if the end point
// is either not visible to the player, or there are at least
// as many translucent walls between the player and the end
// point as between the player and the start point. However,
// monsters can still blink through translucent walls to get
// away from the player, since in the absence of translucent
// walls monsters can blink to places which are not in either
// the monster's nor the player's LOS.
if (!origin_is_player && !you.see_cell(target))
return (true);
// Player can't randomly pass through translucent walls.
if (origin_is_player)
{
if (see_cell_no_trans(target))
return (true);
continue;
}
int walls_passed = num_feats_between(target, origin,
DNGN_CLEAR_ROCK_WALL,
DNGN_CLEAR_PERMAROCK_WALL,
true, true);
if (walls_passed == 0)
return (true);
// Player can't randomly pass through translucent walls.
if (origin_is_player)
continue;
int walls_between = 0;
if (!crawl_state.arena)
walls_between = num_feats_between(target, you.pos(),
DNGN_CLEAR_ROCK_WALL,
DNGN_CLEAR_PERMAROCK_WALL);
if (walls_between >= min_walls_between)
return (true);
}
return (false);
}
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