Python colors.LinearSegmentedColormap方法代码示例

# 需要导入模块: from matplotlib import colors [as 别名]
# 或者: from matplotlib.colors import LinearSegmentedColormap [as 别名]
def cmap_discretize(N, cmap):
    """Return a discrete colormap from the continuous colormap cmap.

    Arguments:
        cmap: colormap instance, eg. cm.jet.
        N: number of colors.

    Example:
        x = resize(arange(100), (5,100))
        djet = cmap_discretize(cm.jet, 5)
        imshow(x, cmap=djet)
    """

    if type(cmap) == str:
        cmap = _plt.get_cmap(cmap)
    colors_i = _np.concatenate((_np.linspace(0, 1., N), (0.,0.,0.,0.)))
    colors_rgba = cmap(colors_i)
    indices = _np.linspace(0, 1., N+1)
    cdict = {}
    for ki,key in enumerate(('red','green','blue')):
        cdict[key] = [ (indices[i], colors_rgba[i-1,ki], colors_rgba[i,ki])
                       for i in range(N+1) ]
    # Return colormap object.
    return _mcolors.LinearSegmentedColormap(cmap.name + "_%d"%N, cdict, 1024) 

# 需要导入模块: from matplotlib import colors [as 别名]
# 或者: from matplotlib.colors import LinearSegmentedColormap [as 别名]
def plot_dist_f(v, o, prefix, suffix, summariesdir):
    xkeys = range(len(v.dist_f))
    ykeys = list(v.dist_f[0].keys())
    f_share = np.ndarray([len(ykeys), len(xkeys)])


    for x in range(f_share.shape[1]):
        for y in range(f_share.shape[0]):
                f_share[y, x] = v.dist_f[xkeys[x]][ykeys[y]]
    ccmap = mplcolors.LinearSegmentedColormap('by_cmap', cdict2)
    fig, ax = plt.subplots(dpi=300)

    pcm = ax.imshow(f_share, origin='lower',
                    extent=[v.time[0], v.time[-1], ykeys[0], ykeys[-1]],
                    aspect='auto',
                    cmap=ccmap)
    clb = fig.colorbar(pcm, ax=ax)

    clb.set_label('share of given share of M13 wt fitness', y=0.5)
    plt.title('Development of fitness distribution')
    plt.ylabel('Fitness relative to wt M13 fitness')
    plt.xlabel('Time [min]')

    plt.savefig(os.path.join(summariesdir, "{}fitness_distribution_{}.png".format(prefix, suffix)))
    plt.close() 

# 需要导入模块: from matplotlib import colors [as 别名]
# 或者: from matplotlib.colors import LinearSegmentedColormap [as 别名]
def createColormap(color, min_factor=1.0, max_factor=0.95):
    """
    Creates colormap with range 0-1 from white to arbitrary color.

    Args:
        color: Matplotlib-readable color representation. Examples: 'g', '#00FFFF', '0.5', [0.1, 0.5, 0.9]
        min_factor(float): Float in the range 0-1, specifying the gray-scale color of the minimal plot value.
        max_factor(float): Float in the range 0-1, multiplication factor of 'color' argument for maximal plot value.

    Returns:
        Colormap object to be used by matplotlib-functions
    """
    rgb = colors.colorConverter.to_rgb(color)
    cdict = {'red':   [(0.0, min_factor, min_factor),
                       (1.0, max_factor*rgb[0], max_factor*rgb[0])],

             'green': [(0.0, min_factor, min_factor),
                       (1.0, max_factor*rgb[1], max_factor*rgb[1])],

             'blue':  [(0.0, min_factor, min_factor),
                       (1.0, max_factor*rgb[2], max_factor*rgb[2])]}

    return colors.LinearSegmentedColormap('custom', cdict) 

# 需要导入模块: from matplotlib import colors [as 别名]
# 或者: from matplotlib.colors import LinearSegmentedColormap [as 别名]
def gpf(self):
        cmap = {"red": [], "green": [], "blue": []}
        with open(self.filepath, "r") as f:
            lastred = (0.0, 0.0, 0.0)
            lastgreen = lastred
            lastblue = lastred
            line = f.readline()
            while line:
                if line[0] != "#":
                    data = [ast.literal_eval(numbyte) for numbyte in line.split()]
                    red = (data[0], lastred[2], data[1])
                    green = (data[0], lastgreen[2], data[2])
                    blue = (data[0], lastblue[2], data[3])
                    cmap["red"].append(red)
                    cmap["green"].append(green)
                    cmap["blue"].append(blue)
                    lastred = red
                    lastgreen = green
                    lastblue = blue
                line = f.readline()
        return dict(cmap=mclr.LinearSegmentedColormap("gpf", cmap)) 

# 需要导入模块: from matplotlib import colors [as 别名]
# 或者: from matplotlib.colors import LinearSegmentedColormap [as 别名]
def gradient_cmap(gcolors, nsteps=256, bounds=None):
    """
    Make a colormap that interpolates between a set of colors
    """
    ncolors = len(gcolors)
    if bounds is None:
        bounds = np.linspace(0, 1, ncolors)

    reds = []
    greens = []
    blues = []
    alphas = []
    for b, c in zip(bounds, gcolors):
        reds.append((b, c[0], c[0]))
        greens.append((b, c[1], c[1]))
        blues.append((b, c[2], c[2]))
        alphas.append((b, c[3], c[3]) if len(c) == 4 else (b, 1., 1.))

    cdict = {'red': tuple(reds),
             'green': tuple(greens),
             'blue': tuple(blues),
             'alpha': tuple(alphas)}

    cmap = LinearSegmentedColormap('grad_colormap', cdict, nsteps)
    return cmap 

# 需要导入模块: from matplotlib import colors [as 别名]
# 或者: from matplotlib.colors import LinearSegmentedColormap [as 别名]
def make_colormap(seq):
    """Return a LinearSegmentedColormap
    seq: a sequence of floats and RGB-tuples. The floats should be increasing
    and in the interval (0,1).
    [from: https://stackoverflow.com/questions/16834861/create-own-colormap-using-matplotlib-and-plot-color-scale]
    """
    seq = [(None,) * 3, 0.0] + list(seq) + [1.0, (None,) * 3]
    cdict = {'red': [], 'green': [], 'blue': []}
    for i, item in enumerate(seq):
        if isinstance(item, float):
            r1, g1, b1 = seq[i - 1]
            r2, g2, b2 = seq[i + 1]
            cdict['red'].append([item, r1, r2])
            cdict['green'].append([item, g1, g2])
            cdict['blue'].append([item, b1, b2])
    return mcolors.LinearSegmentedColormap('CustomMap', cdict) 

# 需要导入模块: from matplotlib import colors [as 别名]
# 或者: from matplotlib.colors import LinearSegmentedColormap [as 别名]
def make_colormap(seq):
    """
    Return a LinearSegmentedColormap: http://stackoverflow.com/a/16836182
    Args:
        seq: a sequence of floats and RGB-tuples. The floats should be increasing
        and in the interval (0,1).
    """
    seq = [(None,) * 3, 0.0] + list(seq) + [1.0, (None,) * 3]
    cdict = {'red': [], 'green': [], 'blue': []}
    for i, item in enumerate(seq):
        if isinstance(item, float):
            r1, g1, b1 = seq[i - 1]
            r2, g2, b2 = seq[i + 1]
            cdict['red'].append([item, r1, r2])
            cdict['green'].append([item, g1, g2])
            cdict['blue'].append([item, b1, b2])
    return mcolors.LinearSegmentedColormap('CustomMap', cdict) 

# 需要导入模块: from matplotlib import colors [as 别名]
# 或者: from matplotlib.colors import LinearSegmentedColormap [as 别名]
def __call__(self, function, cmap):
        return _mcolors.LinearSegmentedColormap('colormap', self.cdict, 1024) 

# 需要导入模块: from matplotlib import colors [as 别名]
# 或者: from matplotlib.colors import LinearSegmentedColormap [as 别名]
def truncate_colormap(cmap, minval=0.0, maxval=1.0, n=-1):
    """
    Truncates a standard matplotlib colourmap so
    that you can use part of the colour range in your plots.
    Handy when the colourmap you like has very light values at
    one end of the map that can't be seen easily.

    Arguments:
      cmap (:obj: `Colormap`): A matplotlib Colormap object. Note this is not
         a string name of the colourmap, you must pass the object type.
      minval (int, optional): The lower value to truncate the colour map to.
         colourmaps range from 0.0 to 1.0. Should be 0.0 to include the full
         lower end of the colour spectrum.
      maxval (int, optional): The upper value to truncate the colour map to.
         maximum should be 1.0 to include the full upper range of colours.
      n (int): Leave at default.

    Example:
       minColor = 0.00
       maxColor = 0.85
       inferno_t = truncate_colormap(_plt.get_cmap("inferno"), minColor, maxColor)
    """
    cmap = _plt.get_cmap(cmap)

    if n == -1:
        n = cmap.N
    new_cmap = _mcolors.LinearSegmentedColormap.from_list(
         'trunc({name},{a:.2f},{b:.2f})'.format(name=cmap.name, a=minval, b=maxval),
         cmap(_np.linspace(minval, maxval, n)))
    return new_cmap 

# 需要导入模块: from matplotlib import colors [as 别名]
# 或者: from matplotlib.colors import LinearSegmentedColormap [as 别名]
def cmap_discretize(self, cmap, N):
        """
        Return a discrete colormap from the continuous colormap cmap.
        From http://scipy.github.io/old-wiki/pages/Cookbook/Matplotlib/ColormapTransformations

        Args:
             cmap: colormap instance, eg. cm.jet.
             N: number of colors.

        Returns:
            discrete colourmap

        Author: FJC

        """

        if type(cmap) == str:
         cmap = plt.get_cmap(cmap)

        colors_i = np.concatenate((np.linspace(0, 1., N), (0.,0.,0.,0.)))
        colors_rgba = cmap(colors_i)
        indices = np.linspace(0, 1., N+1)
        cdict = {}

        for ki,key in enumerate(('red','green','blue')):
         cdict[key] = [ (indices[i], colors_rgba[i-1,ki], colors_rgba[i,ki]) for i in range(N+1) ]

        # Return colormap object.
        return _mcolors.LinearSegmentedColormap(cmap.name + "_%d"%N, cdict, 1024) 

# 需要导入模块: from matplotlib import colors [as 别名]
# 或者: from matplotlib.colors import LinearSegmentedColormap [as 别名]
def _generate_cmap(name, lutsize):
    """Generates the requested cmap from it's name *name*.  The lut size is
    *lutsize*."""

    spec = datad[name]

    # Generate the colormap object.
    if 'red' in spec:
        return colors.LinearSegmentedColormap(name, spec, lutsize)
    else:
        return colors.LinearSegmentedColormap.from_list(name, spec, lutsize) 

# 需要导入模块: from matplotlib import colors [as 别名]
# 或者: from matplotlib.colors import LinearSegmentedColormap [as 别名]
def register_cmap(name=None, cmap=None, data=None, lut=None):
    """
    Add a colormap to the set recognized by :func:`get_cmap`.

    It can be used in two ways::

        register_cmap(name='swirly', cmap=swirly_cmap)

        register_cmap(name='choppy', data=choppydata, lut=128)

    In the first case, *cmap* must be a :class:`matplotlib.colors.Colormap`
    instance.  The *name* is optional; if absent, the name will
    be the :attr:`~matplotlib.colors.Colormap.name` attribute of the *cmap*.

    In the second case, the three arguments are passed to
    the :class:`~matplotlib.colors.LinearSegmentedColormap` initializer,
    and the resulting colormap is registered.

    """
    if name is None:
        try:
            name = cmap.name
        except AttributeError:
            raise ValueError("Arguments must include a name or a Colormap")

    if not cbook.is_string_like(name):
        raise ValueError("Colormap name must be a string")

    if isinstance(cmap, colors.Colormap):
        cmap_d[name] = cmap
        return

    # For the remainder, let exceptions propagate.
    if lut is None:
        lut = mpl.rcParams['image.lut']
    cmap = colors.LinearSegmentedColormap(name, data, lut)
    cmap_d[name] = cmap 

# 需要导入模块: from matplotlib import colors [as 别名]
# 或者: from matplotlib.colors import LinearSegmentedColormap [as 别名]
def _generate_cmap(name, lutsize):
    """Generates the requested cmap from its *name*.  The lut size is
    *lutsize*."""

    spec = datad[name]

    # Generate the colormap object.
    if 'red' in spec:
        return colors.LinearSegmentedColormap(name, spec, lutsize)
    elif 'listed' in spec:
        return colors.ListedColormap(spec['listed'], name)
    else:
        return colors.LinearSegmentedColormap.from_list(name, spec, lutsize) 

# 需要导入模块: from matplotlib import colors [as 别名]
# 或者: from matplotlib.colors import LinearSegmentedColormap [as 别名]
def register_cmap(name=None, cmap=None, data=None, lut=None):
    """
    Add a colormap to the set recognized by :func:`get_cmap`.

    It can be used in two ways::

        register_cmap(name='swirly', cmap=swirly_cmap)

        register_cmap(name='choppy', data=choppydata, lut=128)

    In the first case, *cmap* must be a :class:`matplotlib.colors.Colormap`
    instance.  The *name* is optional; if absent, the name will
    be the :attr:`~matplotlib.colors.Colormap.name` attribute of the *cmap*.

    In the second case, the three arguments are passed to
    the :class:`~matplotlib.colors.LinearSegmentedColormap` initializer,
    and the resulting colormap is registered.

    """
    if name is None:
        try:
            name = cmap.name
        except AttributeError:
            raise ValueError("Arguments must include a name or a Colormap")

    if not isinstance(name, str):
        raise ValueError("Colormap name must be a string")

    if isinstance(cmap, colors.Colormap):
        cmap_d[name] = cmap
        return

    # For the remainder, let exceptions propagate.
    if lut is None:
        lut = mpl.rcParams['image.lut']
    cmap = colors.LinearSegmentedColormap(name, data, lut)
    cmap_d[name] = cmap 

# 需要导入模块: from matplotlib import colors [as 别名]
# 或者: from matplotlib.colors import LinearSegmentedColormap [as 别名]
def test_get_cmaps_registers_ocean_colour(self):
        ensure_cmaps_loaded()
        cmap = cm.get_cmap('deep', 256)
        self.assertTrue((type(cmap) is LinearSegmentedColormap) or (type(cmap) is ListedColormap))