2 * @brief モンスターの逃走・隠匿に関する処理
7 #include "monster-floor/monster-safety-hiding.h"
8 #include "floor/cave.h"
10 #include "monster-floor/monster-dist-offsets.h"
11 #include "monster-race/monster-race.h"
12 #include "monster/monster-flag-types.h"
13 #include "monster/monster-info.h"
14 #include "mspell/mspell-checker.h"
15 #include "system/floor-type-definition.h"
16 #include "target/projection-path-calculator.h"
19 * @brief モンスターが逃げ込める地点を走査する
20 * @param target_ptr プレーヤーへの参照ポインタ
21 * @param m_idx モンスターID
24 * @param d モンスターがいる地点からの距離
27 static coordinate_candidate sweep_safe_coordinate(player_type *target_ptr, MONSTER_IDX m_idx, const POSITION *y_offsets, const POSITION *x_offsets, int d)
29 coordinate_candidate candidate = init_coordinate_candidate();
30 floor_type *floor_ptr = target_ptr->current_floor_ptr;
31 monster_type *m_ptr = &target_ptr->current_floor_ptr->m_list[m_idx];
32 for (POSITION i = 0, dx = x_offsets[0], dy = y_offsets[0];
34 i++, dx = x_offsets[i], dy = y_offsets[i])
36 POSITION y = m_ptr->fy + dy;
37 POSITION x = m_ptr->fx + dx;
38 if (!in_bounds(floor_ptr, y, x)) continue;
41 g_ptr = &floor_ptr->grid_array[y][x];
43 BIT_FLAGS16 riding_mode = (m_idx == target_ptr->riding) ? CEM_RIDING : 0;
44 if (!monster_can_cross_terrain(target_ptr, g_ptr->feat, &r_info[m_ptr->r_idx], riding_mode))
47 if (!(m_ptr->mflag2 & MFLAG2_NOFLOW))
49 if (g_ptr->dist == 0) continue;
50 if (g_ptr->dist > floor_ptr->grid_array[m_ptr->fy][m_ptr->fx].dist + 2 * d) continue;
53 if (projectable(target_ptr, target_ptr->y, target_ptr->x, y, x)) continue;
55 POSITION dis = distance(y, x, target_ptr->y, target_ptr->x);
56 if (dis <= candidate.gdis) continue;
68 * @brief モンスターが逃げ込める安全な地点を返す /
69 * Choose a "safe" location near a monster for it to run toward.
70 * @param target_ptr プレーヤーへの参照ポインタ
71 * @param m_idx モンスターの参照ID
72 * @param yp 移動先のマスのY座標を返す参照ポインタ
73 * @param xp 移動先のマスのX座標を返す参照ポインタ
74 * @return 有効なマスがあった場合TRUEを返す
76 * A location is "safe" if it can be reached quickly and the player\n
77 * is not able to fire into it (it isn't a "clean shot"). So, this will\n
78 * cause monsters to "duck" behind walls. Hopefully, monsters will also\n
79 * try to run towards corridor openings if they are in a room.\n
81 * This function may take lots of CPU time if lots of monsters are\n
84 * Return TRUE if a safe location is available.\n
86 bool find_safety(player_type *target_ptr, MONSTER_IDX m_idx, POSITION *yp, POSITION *xp)
88 monster_type *m_ptr = &target_ptr->current_floor_ptr->m_list[m_idx];
89 for (POSITION d = 1; d < 10; d++)
91 const POSITION *y_offsets;
92 y_offsets = dist_offsets_y[d];
94 const POSITION *x_offsets;
95 x_offsets = dist_offsets_x[d];
97 coordinate_candidate candidate = sweep_safe_coordinate(target_ptr, m_idx, y_offsets, x_offsets, d);
99 if (candidate.gdis <= 0) continue;
101 *yp = m_ptr->fy - candidate.gy;
102 *xp = m_ptr->fx - candidate.gx;
112 * @brief モンスターが隠れられる地点を走査する
113 * @param target_ptr プレーヤーへの参照ポインタ
114 * @param m_idx モンスターID
117 * @param candidate 隠れられる地点の候補地
120 static void sweep_hiding_candidate(player_type *target_ptr, monster_type *m_ptr, const POSITION *y_offsets, const POSITION *x_offsets, coordinate_candidate *candidate)
122 monster_race *r_ptr = &r_info[m_ptr->r_idx];
123 for (POSITION i = 0, dx = x_offsets[0], dy = y_offsets[0];
125 i++, dx = x_offsets[i], dy = y_offsets[i])
127 POSITION y = m_ptr->fy + dy;
128 POSITION x = m_ptr->fx + dx;
129 if (!in_bounds(target_ptr->current_floor_ptr, y, x)) continue;
130 if (!monster_can_enter(target_ptr, y, x, r_ptr, 0)) continue;
131 if (projectable(target_ptr, target_ptr->y, target_ptr->x, y, x) || !clean_shot(target_ptr, m_ptr->fy, m_ptr->fx, y, x, FALSE))
134 POSITION dis = distance(y, x, target_ptr->y, target_ptr->x);
135 if (dis < candidate->gdis && dis >= 2)
139 candidate->gdis = dis;
146 * @brief モンスターが隠れ潜める地点を返す /
147 * Choose a good hiding place near a monster for it to run toward.
148 * @param target_ptr プレーヤーへの参照ポインタ
149 * @param m_idx モンスターの参照ID
150 * @param yp 移動先のマスのY座標を返す参照ポインタ
151 * @param xp 移動先のマスのX座標を返す参照ポインタ
152 * @return 有効なマスがあった場合TRUEを返す
154 * Pack monsters will use this to "ambush" the player and lure him out\n
155 * of corridors into open space so they can swarm him.\n
157 * Return TRUE if a good location is available.\n
159 bool find_hiding(player_type *target_ptr, MONSTER_IDX m_idx, POSITION *yp, POSITION *xp)
161 monster_type *m_ptr = &target_ptr->current_floor_ptr->m_list[m_idx];
162 coordinate_candidate candidate = init_coordinate_candidate();
163 candidate.gdis = 999;
165 for (POSITION d = 1; d < 10; d++)
167 const POSITION *y_offsets;
168 y_offsets = dist_offsets_y[d];
170 const POSITION *x_offsets;
171 x_offsets = dist_offsets_x[d];
173 sweep_hiding_candidate(target_ptr, m_ptr, y_offsets, x_offsets, &candidate);
174 if (candidate.gdis >= 999) continue;
176 *yp = m_ptr->fy - candidate.gy;
177 *xp = m_ptr->fx - candidate.gx;