static bool ai_evaluate_hex(ref AI_Eval eval)
{
int result;
int i, nx, ny, ox, oy, odist, j, nx2, ny2;
bool covered;
eval.target = null;
eval.mov_score = eval.atk_score = 0;
/* terrain modifications which only apply for ground units */
if ((eval.unit.sel_prop.flags & UnitFlags.FLYING) != UnitFlags.FLYING)
{
/* entrenchment bonus. infantry receives more than others. */
eval.mov_score += (((eval.unit.sel_prop.flags & UnitFlags.INFANTRY) == UnitFlags.INFANTRY) ? 2 : 1) *
(Engine.map.map[eval.x, eval.y].terrain.min_entr * 2 +
Engine.map.map[eval.x, eval.y].terrain.max_entr);
/* if the unit looses initiative on this terrain we give a malus */
if (Engine.map.map[eval.x, eval.y].terrain.max_ini < eval.unit.sel_prop.ini)
eval.mov_score -= 5 * (eval.unit.sel_prop.ini -
Engine.map.map[eval.x, eval.y].terrain.max_ini);
/* rivers should be avoided */
if ((Engine.map.map[eval.x, eval.y].terrain.flags[Scenario.cur_weather] & Terrain_flags.RIVER) == Terrain_flags.RIVER)
eval.mov_score -= 50;
if ((Engine.map.map[eval.x, eval.y].terrain.flags[Scenario.cur_weather] & Terrain_flags.SWAMP) == Terrain_flags.SWAMP)
eval.mov_score -= 30;
/* inf_close_def will benefit an infantry while disadvantaging
other units */
if ((Engine.map.map[eval.x, eval.y].terrain.flags[Scenario.cur_weather] & Terrain_flags.INF_CLOSE_DEF) == Terrain_flags.INF_CLOSE_DEF)
{
if ((eval.unit.sel_prop.flags & UnitFlags.INFANTRY) == UnitFlags.INFANTRY)
eval.mov_score += 30;
else
eval.mov_score -= 20;
}
/* if this is a mount position and an enemy or fog is less than
6 tiles away we give a big malus */
if (Engine.map.mask[eval.x, eval.y].mount != 0)
if (ai_unsafe__mount(eval.unit, eval.x, eval.y))
eval.mov_score -= 1000;
/* conquering a flag gives a bonus */
if (Engine.map.map[eval.x, eval.y].player != null)
if (!Player.player_is_ally(eval.unit.player, Engine.map.map[eval.x, eval.y].player))
if (Engine.map.map[eval.x, eval.y].g_unit == null)
{
eval.mov_score += 600;
if (Engine.map.map[eval.x, eval.y].obj)
eval.mov_score += 600;
}
/* if this position allows debarking or is just one hex away
this tile receives a big bonus. */
if (eval.unit.embark == UnitEmbarkTypes.EMBARK_SEA)
{
if (Engine.map.map_check_unit_debark(eval.unit, eval.x, eval.y, UnitEmbarkTypes.EMBARK_SEA, false))
eval.mov_score += 1000;
else
for (i = 0; i < 6; i++)
if (Misc.get_close_hex_pos(eval.x, eval.y, i, out nx, out ny))
if (Engine.map.map_check_unit_debark(eval.unit, nx, ny, UnitEmbarkTypes.EMBARK_SEA, false))
{
eval.mov_score += 500;
break;
}
}
}
/* modifications on flying units */
if ((eval.unit.sel_prop.flags & UnitFlags.FLYING) == UnitFlags.FLYING)
{
/* if interceptor covers an uncovered bomber on this tile give bonus */
if ((eval.unit.sel_prop.flags & UnitFlags.INTERCEPTOR) == UnitFlags.INTERCEPTOR)
{
for (i = 0; i < 6; i++)
if (Misc.get_close_hex_pos(eval.x, eval.y, i, out nx, out ny))
if (Engine.map.map[nx, ny].a_unit != null)
if (Player.player_is_ally(Engine.cur_player, Engine.map.map[nx, ny].a_unit.player))
if ((Engine.map.map[nx, ny].a_unit.sel_prop.flags & UnitFlags.BOMBER) == UnitFlags.BOMBER)
{
covered = false;
for (j = 0; j < 6; j++)
if (Misc.get_close_hex_pos(nx, ny, j, out nx2, out ny2))
if (Engine.map.map[nx2, ny2].a_unit != null)
if (Player.player_is_ally(Engine.cur_player, Engine.map.map[nx2, ny2].a_unit.player))
if ((Engine.map.map[nx2, ny2].a_unit.sel_prop.flags & UnitFlags.INTERCEPTOR) == UnitFlags.INTERCEPTOR)
if (Engine.map.map[nx2, ny2].a_unit != eval.unit)
{
covered = true;
break;
}
if (!covered)
eval.mov_score += 2000; /* 100 equals one tile of getting
to center of interest which must
be overcome */
}
}
}
/* each group has a 'center of interest'. getting closer
to this center is honored. */
if (eval.group.x == -1)
{
/* proceed to the nearest flag */
if ((eval.unit.sel_prop.flags & UnitFlags.FLYING) != UnitFlags.FLYING)
{
if (eval.group.order > 0)
{
if (AI.ai_get_dist(eval.unit, eval.x, eval.y, AI_FIND.AI_FIND_ENEMY_OBJ, out ox, out oy, out odist))
eval.mov_score -= odist * 100;
}
else
if (eval.group.order < 0)
{
if (AI.ai_get_dist(eval.unit, eval.x, eval.y, AI_FIND.AI_FIND_OWN_OBJ, out ox, out oy, out odist))
eval.mov_score -= odist * 100;
}
}
}
else
eval.mov_score -= 100 * Misc.get_dist(eval.x, eval.y, eval.group.x, eval.group.y);
/* defensive support */
ai_count_df_units(eval.unit, eval.x, eval.y, out result);
if (result > 2) result = 2; /* senseful limit */
eval.mov_score += result * 10;
/* check for the best target and save the result to atk_score */
eval.atk_score = eval.mov_score;
if (Engine.map.mask[eval.x, eval.y].mount == 0)
if (((eval.unit.sel_prop.flags & UnitFlags.ATTACK_FIRST) != UnitFlags.ATTACK_FIRST) ||
eval.unit.x == eval.x && eval.unit.y == eval.y)
if (ai_get_best_target(eval.unit, eval.x, eval.y, eval.group, out eval.target, out result))
eval.atk_score += result;
return true;
}
static AI_Eval ai_create_eval(Unit unit, AI_Group group, int x, int y)
{
AI_Eval eval = new AI_Eval();
eval.unit = unit; eval.group = group;
eval.x = x; eval.y = y;
return eval;
}