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Sourcecode: matplotlib version File versions


from __future__ import division
import sys
from cbook import iterable, flatten
from transforms import identity_transform
import warnings
## Note, matplotlib artists use the doc strings for set and get
# methods to enable the introspection methods of setp and getp.  Every
# set_* method should have a docstring containing the line
# ACCEPTS: [ legal | values ]
# and aliases for setters and getters should have a docstring that
# starts with 'alias for ', as in 'alias for set_somemethod'
# You may wonder why we use so much boiler-plate manually defining the
# set_alias and get_alias functions, rather than using some clever
# python trick.  The answer is that I need to be able to manipulate
# the docstring, and there is no clever way to do that in python 2.2,
# as far as I can see - see
# http://groups.google.com/groups?hl=en&lr=&threadm=mailman.5090.1098044946.5135.python-list%40python.org&rnum=1&prev=/groups%3Fq%3D__doc__%2Bauthor%253Ajdhunter%2540ace.bsd.uchicago.edu%26hl%3Den%26btnG%3DGoogle%2BSearch

00023 class Artist:
    Abstract base class for someone who renders into a FigureCanvas

    aname = 'Artist'
    zorder = 0
    def __init__(self):
        self.figure = None

        self._transform = identity_transform()
        self._transformSet = False
        self._visible = True
        self._animated = False
        self._alpha = 1.0
        self.clipbox = None
        self._clipon = False
        self._lod = False
        self._label = ''

        self.eventson = False  # fire events only if eventson
        self._oid = 0  # an observer id
        self._propobservers = {} # a dict from oids to funcs

    def add_callback(self, func):
        oid = self._oid
        self._propobservers[oid] = func
        self._oid += 1
        return oid

    def remove_callback(self, oid):
        try: del self._propobservers[oid]
        except KeyError: pass

    def pchanged(self):
        'fire event when property changed'
        for oid, func in self._propobservers.items():

    def is_transform_set(self):
        'Artist has transform explicity let'
        return self._transformSet

00066     def set_transform(self, t):
        set the Transformation instance used by this artist

        ACCEPTS: a matplotlib.transform transformation instance
        self._transform = t
        self._transformSet = True

    def get_transform(self):
        'return the Transformation instance used by this artist'
        return self._transform

    def is_figure_set(self):
        return self.figure is not None

    def get_figure(self):
        'return the figure instance'
        return self.figure

00087     def set_figure(self, fig):
        Set the figure instance the artist belong to

        ACCEPTS: a matplotlib.figure.Figure instance
        self.figure = fig

00096     def set_clip_box(self, clipbox):
        Set the artist's clip Bbox

        ACCEPTS: a matplotlib.transform.Bbox instance
        self.clipbox = clipbox
        self._clipon = clipbox is not None

00106     def get_alpha(self):
        Return the alpha value used for blending - not supported on all
        return self._alpha

    def get_visible(self):
        "return the artist's visiblity"
        return self._visible

    def get_animated(self):
        "return the artist's animated state"
        return self._animated

    def get_clip_on(self):
        'Return whether artist uses clipping'
        return self._clipon and self.clipbox is not None

    def get_clip_box(self):
        'Return artist clipbox'
        return self.clipbox

00129     def set_clip_on(self, b):
        Set  whether artist uses clipping

        ACCEPTS: [True | False]
        self._clipon = b
        if not b: self.clipbox = None

    def draw(self, renderer, *args, **kwargs):
        'Derived classes drawing method'
        if not self.get_visible(): return

00143     def set_alpha(self, alpha):
        Set the alpha value used for blending - not supported on
        all backends

        ACCEPTS: float
        self._alpha = alpha

00153     def set_lod(self, on):
        Set Level of Detail on or off.  If on, the artists may examine
        things like the pixel width of the axes and draw a subset of
        their contents accordingly

        ACCEPTS: [True | False]
        self._lod = on

00164     def set_visible(self, b):
        set the artist's visiblity

        ACCEPTS: [True | False]
        self._visible = b

00174     def set_animated(self, b):
        set the artist's animation state

        ACCEPTS: [True | False]
        self._animated = b

    def update(self, props):
        store = self.eventson
        self.eventson = False
        changed = False
        for k,v in props.items():
            func = getattr(self, 'set_'+k, None)
            if func is None or not callable(func):
                raise AttributeError('Unknown property %s'%k)
            changed = True
        self.eventson = store
        if changed: self.pchanged()

    def get_label(self):
        return self._label

00200     def set_label(self, s):
        Set the line label to s for auto legend

        ACCEPTS: any string
        self._label = s

    def get_zorder(self): return self.zorder

00211     def set_zorder(self, level):
        Set the zorder for the artist

        ACCEPTS: any number
        self.zorder = level

    def update_from(self, other):
        'copy properties from other to self'
        self._transform = other._transform
        self._transformSet = other._transformSet
        self._visible = other._visible
        self._alpha = other._alpha
        self.clipbox = other.clipbox
        self._clipon = other._clipon
        self._lod = other._lod
        self._label = other._label

00233     def set(self, **kwargs):
        A tkstyle set command, pass kwargs to set properties
        ret = []
        for k,v in kwargs.items():
            k = k.lower()
            funcName = "set_%s"%k
            func = getattr(self,funcName)
            ret.extend( [func(v)] )
        return ret

00245 class ArtistInspector:
    A helper class to insect an Artist and return information about
    it's settable properties and their current values
00250     def __init__(self, o):
        Initialize the artist inspector with an artist or sequence of
        artists.  Id a sequence is used, we assume it is a homogeneous
        sequence (all Artists are of the same type) and it is your
        responsibility to make sure this is so.
        if iterable(o) and len(o): o = o[0]
        self.o = o
        self.aliasd = self.get_aliases()

00261     def get_aliases(self):
        get a dict mapping fullname -> alias for each alias in o.
        Eg for lines: {'markerfacecolor': 'mfc',
                       'linewidth'      : 'lw',
        names = [name for name in dir(self.o) if
                 (name.startswith('set_') or name.startswith('get_'))
                 and callable(getattr(self.o,name))]
        aliases = {}
        for name in names:
            func = getattr(self.o, name)
            if not self.is_alias(func): continue
            docstring = func.__doc__
            fullname = docstring[10:]
            aliases[fullname[4:]] = name[4:]
        return aliases

00280     def get_valid_values(self, attr):
        get the legal arguments for the setter associated with attr

        This is done by querying the doc string of the function set_attr
        for a line that begins with ACCEPTS:

        Eg, for a line linestyle, return
        [ '-' | '--' | '-.' | ':' | 'steps' | 'None' ]

        name = 'set_%s'%attr
        if not hasattr(self.o, name):
            raise AttributeError('%s has no function %s'%(self.o,name))
        func = getattr(self.o, name)

        docstring = func.__doc__
        if docstring is None: return 'unknown'

        if docstring.startswith('alias for '):
            return None
        for line in docstring.split('\n'):
            line = line.lstrip()
            if not line.startswith('ACCEPTS:'): continue
            return line[8:].strip()
        return 'unknown'

00307     def get_setters(self):
        Get the attribute strings with setters for object h.  Eg, for a line,
        return ['markerfacecolor', 'linewidth', ....]

        setters = []
        for name in dir(self.o):
            if not name.startswith('set_'): continue
            o = getattr(self.o,name)
            if not callable(o): continue
            func = o
            if self.is_alias(func): continue
        return setters

    def is_alias(self, o):
        'return true if method object o is an alias for another function'
        ds = o.__doc__
        if ds is None: return False
        return ds.startswith('alias for ')

00329     def aliased_name(self, s):
        return 'PROPNAME or alias' if s has an alias, else return

        Eg for the line markerfacecolor property, which has an alias,
        return 'markerfacecolor or mfc' and for the transform
        property, which does not, return 'transform'
        if self.aliasd.has_key(s):
            return '%s or %s' % (s, self.aliasd[s])
        else: return s

00342     def pprint_setters(self, prop=None):
        if prop is None, return a list of strings of all settable properies
        and their valid values

        if prop is not None, it is a valid property name and that
        property will be returned as a string of property : valid
        if prop is not None:
            accepts = self.get_valid_values(prop)
            return '    %s: %s' %(prop, accepts)

        attrs = self.get_setters()
        lines = []

        for prop in attrs:
            accepts = self.get_valid_values(prop)
            name = self.aliased_name(prop)
            lines.append('    %s: %s' %(name, accepts))
        return lines

00365     def pprint_getters(self):
        return the getters and actual values as list of strings'
        getters = [name for name in dir(self.o)
                   if name.startswith('get_')
                   and callable(getattr(self.o, name))]
        lines = []
        for name in getters:
            func = getattr(self.o, name)
            if self.is_alias(func): continue
            try: val = func()
            except: continue
            if hasattr(val, 'shape') and len(val)>6:
                s = str(val[:6]) + '...'
                s = str(val)
            name = self.aliased_name(name[4:])
            lines.append('    %s = %s' %(name, s))
        return lines

def getp(o, *args):
    Return the value of handle property s

    h is an instance of a class, eg a Line2D or an Axes or Text.
    if s is 'somename', this function returns


    getp can be used to query all the gettable properties with getp(o)
    Many properties have aliases for shorter typing, eg 'lw' is an
    alias for 'linewidth'.  In the output, aliases and full property
    names will be listed as

      property or  alias = value


      linewidth or lw = 2

    insp = ArtistInspector(o)

    if len(args)==0:
        print '\n'.join(insp.pprint_getters())

    name = args[0]
    func = getattr(o, 'get_' + name)
    return func()

def get(o, *args, **kwargs):
    return getp(o, *args, **kwargs)
get.__doc__ = getp.__doc__

def setp(h, *args, **kwargs):
    matplotlib supports the use of setp ("set property") and getp to set 
    and get object properties, as well as to do introspection on the 
    object For example, to set the linestyle of a line to be dashed, you 
    can do

      >>> line, = plot([1,2,3])
      >>> setp(line, linestyle='--')

    If you want to know the valid types of arguments, you can provide the
    name of the property you want to set without a value

      >>> setp(line, 'linestyle')
          linestyle: [ '-' | '--' | '-.' | ':' | 'steps' | 'None' ]

    If you want to see all the properties that can be set, and their
    possible values, you can do

      >>> setp(line)
          ... long output listing omitted'

    setp operates on a single instance or a list of instances.  If you
    are in query mode introspecting the possible values, only the first
    instance in the sequence is used.  When actually setting values,
    all the instances will be set.  Eg, suppose you have a list of two
    lines, the following will make both lines thicker and red

        >>> x = arange(0,1.0,0.01)
        >>> y1 = sin(2*pi*x)
        >>> y2 = sin(4*pi*x)
        >>> lines = plot(x, y1, x, y2)
        >>> setp(lines, linewidth=2, color='r')

    setp works with the matlab(TM) style string/value pairs or with
    python kwargs.  For example, the following are equivalent

        >>> setp(lines, 'linewidth', 2, 'color', r')  # matlab style
        >>> setp(lines, linewidth=2, color='r')       # python style

    insp = ArtistInspector(h)

    if len(kwargs)==0 and len(args)==0:
        print '\n'.join(insp.pprint_setters())

    if len(kwargs)==0 and len(args)==1:
        print insp.pprint_setters(prop=args[0])

    if not iterable(h): h = [h]
    else: h = flatten(h)

    if len(args)%2:
        raise ValueError('The set args must be string, value pairs')

    funcvals = []
    for i in range(0, len(args)-1, 2):
        funcvals.append((args[i], args[i+1]))

    ret = []
    for o in h:
        for s, val in funcvals:
            s = s.lower()
            funcName = "set_%s"%s
            func = getattr(o,funcName)
            ret.extend( [func(val)] )
    return [x for x in flatten(ret)]

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