1 """
2 Rogue-like map utilitys such as line-of-sight, field-of-view, and path-finding.
3
4 """
5 import array
6 import ctypes
7 import itertools
8 import math
9
10 import tdl
11 from .__tcod import _lib, _PATHCALL
12
13 _FOVTYPES = {'BASIC' : 0, 'DIAMOND': 1, 'SHADOW': 2, 'RESTRICTIVE': 12, 'PERMISSIVE': 11}
14
16 "Return a FOV from a string"
17 oldFOV = fov
18 fov = str(fov).upper()
19 if fov in _FOVTYPES:
20 return _FOVTYPES[fov]
21 if fov[:10] == 'PERMISSIVE' and fov[10].isdigit() and fov[10] != '9':
22 return 4 + int(fov[10])
23 raise tdl.TDLError('No such fov option as %s' % oldFOV)
24
26 """A* pathfinder
27
28 Using this class requires a callback detailed in L{AStar.__init__}
29 """
30
31 __slots__ = ('_as_parameter_', '_callback', '__weakref__')
32
33 - def __init__(self, width, height, callback,
34 diagnalCost=math.sqrt(2), advanced=False):
35 """Create an A* pathfinder using a callback.
36
37 Before crating this instance you should make one of two types of
38 callbacks:
39 - A function that returns the cost to move to (x, y)
40 or
41 - A function that returns the cost to move between
42 (destX, destY, sourceX, sourceY)
43 If path is blocked the function should return zero or None.
44 When using the second type of callback be sure to set advanced=True
45
46 @type width: int
47 @param width: width of the pathfinding area in tiles
48 @type height: int
49 @param height: height of the pathfinding area in tiles
50
51 @type callback: function
52 @param callback: A callback taking parameters depending on the setting
53 of 'advanced' and returning the cost of
54 movement for an open tile or zero for a
55 blocked tile.
56
57 @type diagnalCost: float
58 @param diagnalCost: Multiplier for diagonal movement.
59
60 Can be set to zero to disable diagonal movement
61 entirely.
62
63 @type advanced: boolean
64 @param advanced: A simple callback with 2 positional parameters may not
65 provide enough information. Setting this to True will
66 call the callback with 2 additional parameters giving
67 you both the destination and the source of movement.
68
69 When True the callback will need to accept
70 (destX, destY, sourceX, sourceY) as parameters.
71 Instead of just (destX, destY).
72
73 """
74 if not diagnalCost:
75 diagnalCost = 0.0
76 if advanced:
77 def newCallback(sourceX, sourceY, destX, destY, null):
78 pathCost = callback(destX, destY, sourceX, sourceY)
79 if pathCost:
80 return pathCost
81 return 0.0
82 else:
83 def newCallback(sourceX, sourceY, destX, destY, null):
84 pathCost = callback(destX, destY)
85 if pathCost:
86 return pathCost
87 return 0.0
88 self._callback = _PATHCALL(newCallback)
89 """A CFUNCTYPE callback to be kept in memory."""
90 self._as_parameter_ = _lib.TCOD_path_new_using_function(width, height,
91 self._callback, None, diagnalCost)
92
94 _lib.TCOD_path_delete(self)
95
96 - def getPath(self, origX, origY, destX, destY):
97 found = _lib.TCOD_path_compute(self, origX, origY, destX, destY)
98 if not found:
99 return []
100 x, y = ctypes.c_int(), ctypes.c_int()
101 xRef, yRef = ctypes.byref(x), ctypes.byref(y)
102 recalculate = ctypes.c_bool(True)
103 path = []
104 while _lib.TCOD_path_walk(self, xRef, yRef, recalculate):
105 path.append((x.value, y.value))
106 return path
107
108 -def quickFOV(x, y, callback, fov='PERMISSIVE', radius=7.5, lightWalls=True, sphere=True):
109 """All field-of-view functionality in one call.
110
111 Before using this call be sure to make a function, lambda, or method that takes 2
112 positional parameters and returns True if light can pass the tile or False
113 for light-blocking tiles and for positions that are out of bounds of the
114 dungeon.
115
116 This function is 'quick' as in no hassle but can quickly become a very slow
117 function call if a large radius is used or the callback provided itself
118 isn't optimized.
119
120 @type x: int
121 @param x: x center of the field-of-view
122 @type y: int
123 @param y: y center of the field-of-view
124 @type callback: function
125 @param callback: This should be a function that takes two positional arguments x,y
126 and returns True if the tile at that position is transparent
127 or False if the tile blocks light or is out of bounds.
128 @type fov: string
129 @param fov: The type of field-of-view to be used. Available types are:
130
131 'BASIC', 'DIAMOND', 'SHADOW', 'RESTRICTIVE', 'PERMISSIVE',
132 'PERMISSIVE0', 'PERMISSIVE1', ..., 'PERMISSIVE8'
133 @type radius: float
134 @param radius: Raduis of the field-of-view.
135
136 When sphere is True a floating point can be used to fine-tune
137 the range. Otherwise the radius is just rounded up.
138
139 Be careful as a large radius has an exponential affect on
140 how long this function takes.
141 @type lightWalls: boolean
142 @param lightWalls: Include or exclude wall tiles in the field-of-view.
143 @type sphere: boolean
144 @param sphere: True for a spherical field-of-view. False for a square one.
145
146 @rtype: iterator
147 @return: Returns an iterator of (x, y) points that are within the field-of-view
148 """
149 trueRadius = radius
150 radius = math.ceil(radius)
151 mapSize = radius * 2 + 1
152 fov = _getFOVType(fov)
153
154 setProp = _lib.TCOD_map_set_properties
155 inFOV = _lib.TCOD_map_is_in_fov
156
157 cTrue = ctypes.c_bool(1)
158 cFalse = ctypes.c_bool(False)
159 try:
160 tcodMap = _lib.TCOD_map_new(mapSize, mapSize)
161
162 for (x_, cX), (y_, cY) in itertools.product(((i, ctypes.c_int(i)) for i in range(mapSize)),
163 ((i, ctypes.c_int(i)) for i in range(mapSize))):
164
165 pos = (x_ + x - radius,
166 y_ + y - radius)
167 transparent = bool(callback(*pos))
168 setProp(tcodMap, cX, cY, transparent, cFalse)
169
170
171 _lib.TCOD_map_compute_fov(tcodMap, radius, radius, radius, lightWalls, fov)
172 touched = []
173 for (x_, cX),(y_, cY) in itertools.product(((i, ctypes.c_int(i)) for i in range(mapSize)),
174 ((i, ctypes.c_int(i)) for i in range(mapSize))):
175 if sphere and math.hypot(x_ - radius, y_ - radius) > trueRadius:
176 continue
177 if inFOV(tcodMap, cX, cY):
178 touched.append((x_ + x - radius, y_ + y - radius))
179 finally:
180 _lib.TCOD_map_delete(tcodMap)
181 return touched
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217 __all__ = ['AStar', 'quickFOV']
218