MouseWheel.__init__() - Code Metrics - Inspection of "Release v4.2.1" - HexDecimal/python-tdl - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — master ( f06638...0a21cc )

by Kyle

created 2018-01-07 02:11 UTC

MouseWheel.init() A

↳ Parent: MouseWheel

Complexity

Conditions

Size

Total Lines

Duplication

Lines	0
Ratio	0 %

Importance

Changes	1
Bugs	0	Features	0

Metric	Value
cc	1
c	1
b	0
f	0
dl	0
loc	4
rs	10

#!/usr/bin/env python
"""
    An alternative, more direct implementation of event handling using cffi
    calls to SDL functions.  The current code is incomplete, but can be
    extended easily by following the official SDL documentation.

    This module be run directly like any other event get example, but is meant
    to be copied into your code base.  Then you can use the sdlevent.get and
    sdlevent.wait functions in your code.

    Printing any event will tell you its attributes in a human readable format.
    An events type attr is just the classes name with all letters upper-case.

    Like in tdl, events use a type attribute to tell events apart.  Unlike tdl
    and tcod the names and values used are directly derived from SDL.

    As a general guideline for turn-based rouge-likes, you should use
    KeyDown.sym for commands, and TextInput.text for name entry.

    This module may be included as a tcod.event module once it is more mature.

    An absolute minimal example:

        import tcod
        import sdlevent

        with tcod.console_init_root(80, 60, 'title') as console:
            while True:
                for event in sdlevent.wait():
                    print(event)
                    if event.type == 'QUIT':
                        raise SystemExit()
                tcod.console_flush()
"""
# CC0 License: https://creativecommons.org/publicdomain/zero/1.0/
# To the extent possible under law, Kyle Stewart has waived all copyright and
# related or neighboring rights to this sdlevent.py module.

import tcod

def _copy_attrs(prefix):
    """Copy names and values from tcod.lib into this modules top-level scope.

    This is a private function, used internally.

    Args:
        prefix (str): Used to filter out which names to copy.

    Returns:
        Dict[Any,str]: A reverse lookup table used in Event repr functions.
    """
    g = globals() # dynamically add names to the global state
    # removes the SDL prefix, this module already has SDL in the name
    if prefix.startswith('SDL_'):
        name_starts_at = 4
    elif prefix.startswith('SDL'):
        name_starts_at = 3
    else:
        name_starts_at = 0
    revere_table = {}
    for attr in dir(tcod.lib):
        if attr.startswith(prefix):
            name = attr[name_starts_at:]
            value = getattr(tcod.lib, attr)
            revere_table[value] = 'sdlevent.' + name
            g[name] = value

    return revere_table

def _describe_bitmask(bits, table, default='0'):
    """Returns a bitmask in human readable form.

    This is a private function, used internally.

    Args:
        bits (int): The bitmask to be represented.
        table (Dict[Any,str]): A reverse lookup table.
        default (Any): A default return value when bits is 0.

    Returns: str: A printable version of the bits variable.
    """
    result = []
    for bit, name in table.items():
        if bit & bits:
            result.append(name)
    if not result:
        return default
    return '|'.join(result)


_REVSRSE_SCANCODE_TABLE = _copy_attrs('SDL_SCANCODE')
_REVSRSE_SYM_TABLE = _copy_attrs('SDLK')
_REVSRSE_MOD_TABLE = _copy_attrs('KMOD')
_REVSRSE_WHEEL_TABLE = _copy_attrs('SDL_MOUSEWHEEL')

# manually define names for SDL macros
BUTTON_LEFT = 1
BUTTON_MIDDLE = 2
BUTTON_RIGHT = 3
BUTTON_X1 = 4
BUTTON_X2 = 5
BUTTON_LMASK = 0x01
BUTTON_MMASK = 0x02
BUTTON_RMASK = 0x04
BUTTON_X1MASK = 0x08
BUTTON_X2MASK = 0x10

_REVSRSE_BUTTON_TABLE = {
    BUTTON_LEFT: 'sdlevent.BUTTON_LEFT',
    BUTTON_MIDDLE: 'sdlevent.BUTTON_MIDDLE',
    BUTTON_RIGHT: 'sdlevent.BUTTON_RIGHT',
    BUTTON_X1: 'sdlevent.BUTTON_X1',
    BUTTON_X2: 'sdlevent.BUTTON_X2',
}

_REVSRSE_BUTTON_MASK_TABLE = {
    BUTTON_LMASK: 'sdlevent.BUTTON_LMASK',
    BUTTON_MMASK: 'sdlevent.BUTTON_MMASK',
    BUTTON_RMASK: 'sdlevent.BUTTON_RMASK',
    BUTTON_X1MASK: 'sdlevent.BUTTON_X1MASK',
    BUTTON_X2MASK: 'sdlevent.BUTTON_X2MASK',
}

class Event(object):
    """The base event class."""
    @classmethod
    def from_sdl_event(cls, sdl_event):
        """Return a class instance from a cffi SDL_Event pointer."""
        raise NotImplementedError()

    @property
    def type(self):
        """All event types are just the class name, but all upper-case."""
        return self.__class__.__name__.upper()


class Quit(Event):
    """An application quit request event.

    For more info on when this event is triggered see:
    https://wiki.libsdl.org/SDL_EventType#SDL_QUIT
    """
    @classmethod
    def from_sdl_event(cls, sdl_event):
        return cls()

    def __repr__(self):
        return 'sdlevent.%s()' % self.__class__.__name__


class KeyboardEvent(Event):

    def __init__(self, scancode, sym, mod):
        self.scancode = scancode
        self.sym = sym
        self.mod = mod

    @classmethod
    def from_sdl_event(cls, sdl_event):
        keysym = sdl_event.key.keysym
        return cls(keysym.scancode, keysym.sym, keysym.mod)

    def __repr__(self):
        return ('sdlevent.%s(scancode=%s, sym=%s, mod=%s)' %
                (self.__class__.__name__,
                 _REVSRSE_SCANCODE_TABLE[self.scancode],
                 _REVSRSE_SYM_TABLE[self.sym],
                 _describe_bitmask(self.mod, _REVSRSE_MOD_TABLE),
                 )
                )


class KeyDown(KeyboardEvent):
    pass


class KeyUp(KeyboardEvent):
    pass


class MouseMotion(Event):

    def __init__(self, x, y, xrel, yrel, state):
        self.x = x
        self.y = y
        self.xrel = xrel
        self.yrel = yrel
        self.state = state

    @classmethod
    def from_sdl_event(cls, sdl_event):
        motion = sdl_event.motion
        return cls(motion.x, motion.y, motion.xrel, motion.yrel, motion.state)

    def __repr__(self):
        return ('sdlevent.%s(x=%i, y=%i, xrel=%i, yrel=%i, state=%s)' %
                (self.__class__.__name__,
                 self.x, self.y,
                 self.xrel, self.yrel,
                 _describe_bitmask(self.state, _REVSRSE_BUTTON_MASK_TABLE),
                 )
                )


class MouseButtonEvent(Event):

    def __init__(self, x, y, button):
        self.x = x
        self.y = y
        self.button = button

    @classmethod
    def from_sdl_event(cls, sdl_event):
        button = sdl_event.button
        return cls(button.x, button.y, button.button)

    def __repr__(self):
        return ('sdlevent.%s(x=%i, y=%i, button=%s)' %
                (self.__class__.__name__,
                 self.x, self.y, _REVSRSE_BUTTON_TABLE[self.button],
                 )
                )


class MouseButtonDown(MouseButtonEvent):
    pass


class MouseButtonUp(MouseButtonEvent):
    pass


class MouseWheel(Event):

    def __init__(self, x, y, direction):
        self.x = x
        self.y = y
        self.direction = direction

    @classmethod
    def from_sdl_event(cls, sdl_event):
        wheel = sdl_event.wheel
        return cls(wheel.x, wheel.y, wheel.direction)

    def __repr__(self):
        return ('sdlevent.%s(x=%i, y=%i, direction=%s)' %
                (self.__class__.__name__,
                 self.x, self.y,
                 _REVSRSE_WHEEL_TABLE[self.direction],
                 )
                )


class TextInput(Event):

    def __init__(self, text):
        self.text = text

    @classmethod
    def from_sdl_event(cls, sdl_event):
        return cls(tcod.ffi.string(sdl_event.text.text, 32).decode('utf8'))

    def __repr__(self):
        return ('sdlevent.%s(text=%r)' % (self.__class__.__name__, self.text))


_SDL_TO_CLASS_TABLE = {
    tcod.lib.SDL_QUIT: Quit,
    tcod.lib.SDL_KEYDOWN: KeyDown,
    tcod.lib.SDL_KEYUP: KeyUp,
    tcod.lib.SDL_MOUSEMOTION: MouseMotion,
    tcod.lib.SDL_MOUSEBUTTONDOWN: MouseButtonDown,
    tcod.lib.SDL_MOUSEBUTTONUP: MouseButtonUp,
    tcod.lib.SDL_MOUSEWHEEL: MouseWheel,
    tcod.lib.SDL_TEXTINPUT: TextInput,
}

def get():
    """Iterate over all pending events.

    Returns:
        Iterator[sdlevent.Event]:
            An iterator of Event subclasses.
    """
    sdl_event = tcod.ffi.new('SDL_Event*')
    while tcod.lib.SDL_PollEvent(sdl_event):
        if sdl_event.type in _SDL_TO_CLASS_TABLE:
            yield _SDL_TO_CLASS_TABLE[sdl_event.type].from_sdl_event(sdl_event)

def wait(timeout=None):
    """Block until an event exists, then iterate over all events.

    Keep in mind that this function will wake even for events not handled by
    this module.

    Args:
        timeout (Optional[int]):
            Maximum number of milliseconds to wait, or None to wait forever.

    Returns:
        Iterator[sdlevent.Event]: Same iterator as a call to sdlevent.get
    """
    if timeout is not None:
        tcod.lib.SDL_WaitEventTimeout(tcod.ffi.NULL, timeout)
    else:
        tcod.lib.SDL_WaitEvent(tcod.ffi.NULL)
    return get()

def _main():
    """An example program for when this module is run directly."""
    WIDTH, HEIGHT = 120, 60
    TITLE = 'sdlevent.py engine'

    with tcod.console_init_root(WIDTH, HEIGHT, TITLE) as console:
        tcod.sys_set_fps(24)
        while True:
            for event in wait():
                print(event)
                if event.type == 'QUIT':
                    raise SystemExit()
                elif event.type == 'MOUSEMOTION':
                    console.rect(0, HEIGHT - 1, WIDTH, 1, True)
                    console.print_(0, HEIGHT - 1, repr(event))
                else:
                    console.blit(console, 0, 0, 0, 1, WIDTH, HEIGHT - 2)
                    console.print_(0, HEIGHT - 3, repr(event))
            tcod.console_flush()

if __name__ == '__main__':
    _main()


1			#!/usr/bin/env python
2			"""
3			An alternative, more direct implementation of event handling using cffi
4			calls to SDL functions. The current code is incomplete, but can be
5			extended easily by following the official SDL documentation.
6
7			This module be run directly like any other event get example, but is meant
8			to be copied into your code base. Then you can use the sdlevent.get and
9			sdlevent.wait functions in your code.
10
11			Printing any event will tell you its attributes in a human readable format.
12			An events type attr is just the classes name with all letters upper-case.
13
14			Like in tdl, events use a type attribute to tell events apart. Unlike tdl
15			and tcod the names and values used are directly derived from SDL.
16
17			As a general guideline for turn-based rouge-likes, you should use
18			KeyDown.sym for commands, and TextInput.text for name entry.
19
20			This module may be included as a tcod.event module once it is more mature.
21
22			An absolute minimal example:
23
24			import tcod
25			import sdlevent
26
27			with tcod.console_init_root(80, 60, 'title') as console:
28			while True:
29			for event in sdlevent.wait():
30			print(event)
31			if event.type == 'QUIT':
32			raise SystemExit()
33			tcod.console_flush()
34			"""
35			# CC0 License: https://creativecommons.org/publicdomain/zero/1.0/
36			# To the extent possible under law, Kyle Stewart has waived all copyright and
37			# related or neighboring rights to this sdlevent.py module.
38
39			import tcod
40
41			def _copy_attrs(prefix):
42			"""Copy names and values from tcod.lib into this modules top-level scope.
43
44			This is a private function, used internally.
45
46			Args:
47			prefix (str): Used to filter out which names to copy.
48
49			Returns:
50			Dict[Any,str]: A reverse lookup table used in Event repr functions.
51			"""
52			g = globals() # dynamically add names to the global state
53			# removes the SDL prefix, this module already has SDL in the name
54			if prefix.startswith('SDL_'):
55			name_starts_at = 4
56			elif prefix.startswith('SDL'):
57			name_starts_at = 3
58			else:
59			name_starts_at = 0
60			revere_table = {}
61			for attr in dir(tcod.lib):
62			if attr.startswith(prefix):
63			name = attr[name_starts_at:]
64			value = getattr(tcod.lib, attr)
65			revere_table[value] = 'sdlevent.' + name
66			g[name] = value
67
68			return revere_table
69
70			def _describe_bitmask(bits, table, default='0'):
71			"""Returns a bitmask in human readable form.
72
73			This is a private function, used internally.
74
75			Args:
76			bits (int): The bitmask to be represented.
77			table (Dict[Any,str]): A reverse lookup table.
78			default (Any): A default return value when bits is 0.
79
80			Returns: str: A printable version of the bits variable.
81			"""
82			result = []
83			for bit, name in table.items():
84			if bit & bits:
85			result.append(name)
86			if not result:
87			return default
88			return '\|'.join(result)
89
90
91			_REVSRSE_SCANCODE_TABLE = _copy_attrs('SDL_SCANCODE')
92			_REVSRSE_SYM_TABLE = _copy_attrs('SDLK')
93			_REVSRSE_MOD_TABLE = _copy_attrs('KMOD')
94			_REVSRSE_WHEEL_TABLE = _copy_attrs('SDL_MOUSEWHEEL')
95
96			# manually define names for SDL macros
97			BUTTON_LEFT = 1
98			BUTTON_MIDDLE = 2
99			BUTTON_RIGHT = 3
100			BUTTON_X1 = 4
101			BUTTON_X2 = 5
102			BUTTON_LMASK = 0x01
103			BUTTON_MMASK = 0x02
104			BUTTON_RMASK = 0x04
105			BUTTON_X1MASK = 0x08
106			BUTTON_X2MASK = 0x10
107
108			_REVSRSE_BUTTON_TABLE = {
109			BUTTON_LEFT: 'sdlevent.BUTTON_LEFT',
110			BUTTON_MIDDLE: 'sdlevent.BUTTON_MIDDLE',
111			BUTTON_RIGHT: 'sdlevent.BUTTON_RIGHT',
112			BUTTON_X1: 'sdlevent.BUTTON_X1',
113			BUTTON_X2: 'sdlevent.BUTTON_X2',
114			}
115
116			_REVSRSE_BUTTON_MASK_TABLE = {
117			BUTTON_LMASK: 'sdlevent.BUTTON_LMASK',
118			BUTTON_MMASK: 'sdlevent.BUTTON_MMASK',
119			BUTTON_RMASK: 'sdlevent.BUTTON_RMASK',
120			BUTTON_X1MASK: 'sdlevent.BUTTON_X1MASK',
121			BUTTON_X2MASK: 'sdlevent.BUTTON_X2MASK',
122			}
123
124			class Event(object):
125			"""The base event class."""
126			@classmethod
127			def from_sdl_event(cls, sdl_event):
128			"""Return a class instance from a cffi SDL_Event pointer."""
129			raise NotImplementedError()
130
131			@property
132			def type(self):
133			"""All event types are just the class name, but all upper-case."""
134			return self.__class__.__name__.upper()
135
136
137			class Quit(Event):
138			"""An application quit request event.
139
140			For more info on when this event is triggered see:
141			https://wiki.libsdl.org/SDL_EventType#SDL_QUIT
142			"""
143			@classmethod
144			def from_sdl_event(cls, sdl_event):
145			return cls()
146
147			def __repr__(self):
148			return 'sdlevent.%s()' % self.__class__.__name__
149
150
151			class KeyboardEvent(Event):
152
153			def __init__(self, scancode, sym, mod):
154			self.scancode = scancode
155			self.sym = sym
156			self.mod = mod
157
158			@classmethod
159			def from_sdl_event(cls, sdl_event):
160			keysym = sdl_event.key.keysym
161			return cls(keysym.scancode, keysym.sym, keysym.mod)
162
163			def __repr__(self):
164			return ('sdlevent.%s(scancode=%s, sym=%s, mod=%s)' %
165			(self.__class__.__name__,
166			_REVSRSE_SCANCODE_TABLE[self.scancode],
167			_REVSRSE_SYM_TABLE[self.sym],
168			_describe_bitmask(self.mod, _REVSRSE_MOD_TABLE),
169			)
170			)
171
172
173			class KeyDown(KeyboardEvent):
174			pass
175
176
177			class KeyUp(KeyboardEvent):
178			pass
179
180
181			class MouseMotion(Event):
182
183			def __init__(self, x, y, xrel, yrel, state):
184			self.x = x
185			self.y = y
186			self.xrel = xrel
187			self.yrel = yrel
188			self.state = state
189
190			@classmethod
191			def from_sdl_event(cls, sdl_event):
192			motion = sdl_event.motion
193			return cls(motion.x, motion.y, motion.xrel, motion.yrel, motion.state)
194
195			def __repr__(self):
196			return ('sdlevent.%s(x=%i, y=%i, xrel=%i, yrel=%i, state=%s)' %
197			(self.__class__.__name__,
198			self.x, self.y,
199			self.xrel, self.yrel,
200			_describe_bitmask(self.state, _REVSRSE_BUTTON_MASK_TABLE),
201			)
202			)
203
204
205			class MouseButtonEvent(Event):
206
207			def __init__(self, x, y, button):
208			self.x = x
209			self.y = y
210			self.button = button
211
212			@classmethod
213			def from_sdl_event(cls, sdl_event):
214			button = sdl_event.button
215			return cls(button.x, button.y, button.button)
216
217			def __repr__(self):
218			return ('sdlevent.%s(x=%i, y=%i, button=%s)' %
219			(self.__class__.__name__,
220			self.x, self.y, _REVSRSE_BUTTON_TABLE[self.button],
221			)
222			)
223
224
225			class MouseButtonDown(MouseButtonEvent):
226			pass
227
228
229			class MouseButtonUp(MouseButtonEvent):
230			pass
231
232
233			class MouseWheel(Event):
234
235			def __init__(self, x, y, direction):
236			self.x = x
237			self.y = y
238			self.direction = direction
239
240			@classmethod
241			def from_sdl_event(cls, sdl_event):
242			wheel = sdl_event.wheel
243			return cls(wheel.x, wheel.y, wheel.direction)
244
245			def __repr__(self):
246			return ('sdlevent.%s(x=%i, y=%i, direction=%s)' %
247			(self.__class__.__name__,
248			self.x, self.y,
249			_REVSRSE_WHEEL_TABLE[self.direction],
250			)
251			)
252
253
254			class TextInput(Event):
255
256			def __init__(self, text):
257			self.text = text
258
259			@classmethod
260			def from_sdl_event(cls, sdl_event):
261			return cls(tcod.ffi.string(sdl_event.text.text, 32).decode('utf8'))
262
263			def __repr__(self):
264			return ('sdlevent.%s(text=%r)' % (self.__class__.__name__, self.text))
265
266
267			_SDL_TO_CLASS_TABLE = {
268			tcod.lib.SDL_QUIT: Quit,
269			tcod.lib.SDL_KEYDOWN: KeyDown,
270			tcod.lib.SDL_KEYUP: KeyUp,
271			tcod.lib.SDL_MOUSEMOTION: MouseMotion,
272			tcod.lib.SDL_MOUSEBUTTONDOWN: MouseButtonDown,
273			tcod.lib.SDL_MOUSEBUTTONUP: MouseButtonUp,
274			tcod.lib.SDL_MOUSEWHEEL: MouseWheel,
275			tcod.lib.SDL_TEXTINPUT: TextInput,
276			}
277
278			def get():
279			"""Iterate over all pending events.
280
281			Returns:
282			Iterator[sdlevent.Event]:
283			An iterator of Event subclasses.
284			"""
285			sdl_event = tcod.ffi.new('SDL_Event*')
286			while tcod.lib.SDL_PollEvent(sdl_event):
287			if sdl_event.type in _SDL_TO_CLASS_TABLE:
288			yield _SDL_TO_CLASS_TABLE[sdl_event.type].from_sdl_event(sdl_event)
289
290			def wait(timeout=None):
291			"""Block until an event exists, then iterate over all events.
292
293			Keep in mind that this function will wake even for events not handled by
294			this module.
295
296			Args:
297			timeout (Optional[int]):
298			Maximum number of milliseconds to wait, or None to wait forever.
299
300			Returns:
301			Iterator[sdlevent.Event]: Same iterator as a call to sdlevent.get
302			"""
303			if timeout is not None:
304			tcod.lib.SDL_WaitEventTimeout(tcod.ffi.NULL, timeout)
305			else:
306			tcod.lib.SDL_WaitEvent(tcod.ffi.NULL)
307			return get()
308
309			def _main():
310			"""An example program for when this module is run directly."""
311			WIDTH, HEIGHT = 120, 60
312			TITLE = 'sdlevent.py engine'
313
314			with tcod.console_init_root(WIDTH, HEIGHT, TITLE) as console:
315			tcod.sys_set_fps(24)
316			while True:
317			for event in wait():
318			print(event)
319			if event.type == 'QUIT':
320			raise SystemExit()
321			elif event.type == 'MOUSEMOTION':
322			console.rect(0, HEIGHT - 1, WIDTH, 1, True)
323			console.print_(0, HEIGHT - 1, repr(event))
324			else:
325			console.blit(console, 0, 0, 0, 1, WIDTH, HEIGHT - 2)
326			console.print_(0, HEIGHT - 3, repr(event))
327			tcod.console_flush()
328
329			if __name__ == '__main__':
330			_main()
331

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