python-igraph API reference

List of all classes, functions and methods in python-igraph

igraph.drawing.colors

module documentation

Color handling functions.

Class AdvancedGradientPalette Advanced gradient that consists of more than two base colors.
Class ClusterColoringPalette A palette suitable for coloring vertices when plotting a clustering.
Class GradientPalette Base class for gradient palettes
Class Palette Base class of color palettes.
Class PrecalculatedPalette A palette that returns colors from a pre-calculated list of colors
Class RainbowPalette A palette that varies the hue of the colors along a scale.
Function clamp Clamps the given value between min and max
Function color_name_to_rgb Converts a color given in one of the supported color formats to R-G-B values.
Function color_name_to_rgba Converts a color given in one of the supported color formats to R-G-B-A values.
Function color_to_html_format Formats a color given as a 3-tuple or 4-tuple in HTML format.
Function darken Creates a darker version of a color given by an RGB triplet.
Function hsl_to_rgb Converts a color given by its HSL coordinates (hue, saturation, lightness) to RGB coordinates.
Function hsla_to_rgba Converts a color given by its HSLA coordinates (hue, saturation, lightness, alpha) to RGBA coordinates.
Function hsv_to_rgb Converts a color given by its HSV coordinates (hue, saturation, value) to RGB coordinates.
Function hsva_to_rgba Converts a color given by its HSVA coordinates (hue, saturation, value, alpha) to RGB coordinates.
Function lighten Creates a lighter version of a color given by an RGB triplet.
Function rgb_to_hsl Converts a color given by its RGB coordinates to HSL coordinates (hue, saturation, lightness).
Function rgb_to_hsv Converts a color given by its RGB coordinates to HSV coordinates (hue, saturation, value).
Function rgba_to_hsla Converts a color given by its RGBA coordinates to HSLA coordinates (hue, saturation, lightness, alpha).
Function rgba_to_hsva Converts a color given by its RGBA coordinates to HSVA coordinates (hue, saturation, value, alpha).
Variable known_colors Undocumented
Variable palettes Undocumented
def clamp(value, min_value, max_value):

Clamps the given value between min and max

def color_name_to_rgb(color, palette=None):

Converts a color given in one of the supported color formats to R-G-B values.

This is done by calling color_name_to_rgba and then throwing away the alpha value.

See Also
color_name_to_rgba for more details about what formats are understood by this function.
def color_name_to_rgba(color, palette=None):

Converts a color given in one of the supported color formats to R-G-B-A values.

Examples:

>>> color_name_to_rgba("red")
(1.0, 0.0, 0.0, 1.0)
>>> color_name_to_rgba("#ff8000") == (1.0, 128/255.0, 0.0, 1.0)
True
>>> color_name_to_rgba("#ff800080") == (1.0, 128/255.0, 0.0, 128/255.0)
True
>>> color_name_to_rgba("#08f") == (0.0, 136/255.0, 1.0, 1.0)
True
>>> color_name_to_rgba("rgb(100%, 50%, 0%)")
(1.0, 0.5, 0.0, 1.0)
>>> color_name_to_rgba("rgba(100%, 50%, 0%, 25%)")
(1.0, 0.5, 0.0, 0.25)
>>> color_name_to_rgba("hsla(120, 100%, 50%, 0.5)")
(0.0, 1.0, 0.0, 0.5)
>>> color_name_to_rgba("hsl(60, 100%, 50%)")
(1.0, 1.0, 0.0, 1.0)
>>> color_name_to_rgba("hsv(60, 100%, 100%)")
(1.0, 1.0, 0.0, 1.0)
Parameters
color

the color to be converted in one of the following formats:

  • CSS3 color specification: #rrggbb, #rgb, #rrggbbaa, #rgba, rgb(red, green, blue), rgba(red, green, blue, alpha), hsl(hue, saturation, lightness), hsla(hue, saturation, lightness, alpha), hsv(hue, saturation, value) and hsva(hue, saturation, value, alpha) where the components are given as hexadecimal numbers in the first four cases and as decimals or percentages (0%-100%) in the remaining cases. Red, green and blue components are between 0 and 255; hue is between 0 and 360; saturation, lightness and value is between 0 and 100; alpha is between 0 and 1.
  • Valid HTML color names, i.e. those that are present in the HTML 4.0 specification
  • Valid X11 color names, see http://en.wikipedia.org/wiki/X11_color_names
  • Red-green-blue components given separately in either a comma-, slash- or whitespace-separated string or a list or a tuple, in the range of 0-255. An alpha value of 255 (maximal opacity) will be assumed.
  • Red-green-blue-alpha components given separately in either a comma-, slash- or whitespace-separated string or a list or a tuple, in the range of 0-255
  • A single palette index given either as a string or a number. Uses the palette given in the palette parameter of the method call.
palettethe palette to be used if a single number is passed to the method. Must be an instance of colors.Palette.
Returns
the RGBA values corresponding to the given color in a 4-tuple. Since these colors are primarily used by Cairo routines, the tuples contain floats in the range 0.0-1.0
def color_to_html_format(color):

Formats a color given as a 3-tuple or 4-tuple in HTML format.

The HTML format is simply given by #rrggbbaa, where rr gives the red component in hexadecimal format, gg gives the green component bb gives the blue component and gg gives the alpha level. The alpha level is optional.

def darken(color, ratio=0.5):

Creates a darker version of a color given by an RGB triplet.

This is done by mixing the original color with black using the given ratio. A ratio of 1.0 will yield a completely black color, a ratio of 0.0 will yield the original color. The alpha values are left intact.

def hsl_to_rgb(h, s, l):

Converts a color given by its HSL coordinates (hue, saturation, lightness) to RGB coordinates.

Each of the HSL coordinates must be in the range [0, 1].

def hsla_to_rgba(h, s, l, alpha=1.0):

Converts a color given by its HSLA coordinates (hue, saturation, lightness, alpha) to RGBA coordinates.

Each of the HSLA coordinates must be in the range [0, 1].

def hsv_to_rgb(h, s, v):

Converts a color given by its HSV coordinates (hue, saturation, value) to RGB coordinates.

Each of the HSV coordinates must be in the range [0, 1].

def hsva_to_rgba(h, s, v, alpha=1.0):

Converts a color given by its HSVA coordinates (hue, saturation, value, alpha) to RGB coordinates.

Each of the HSVA coordinates must be in the range [0, 1].

def lighten(color, ratio=0.5):

Creates a lighter version of a color given by an RGB triplet.

This is done by mixing the original color with white using the given ratio. A ratio of 1.0 will yield a completely white color, a ratio of 0.0 will yield the original color.

def rgb_to_hsl(r, g, b):

Converts a color given by its RGB coordinates to HSL coordinates (hue, saturation, lightness).

Each of the RGB coordinates must be in the range [0, 1].

def rgb_to_hsv(r, g, b):

Converts a color given by its RGB coordinates to HSV coordinates (hue, saturation, value).

Each of the RGB coordinates must be in the range [0, 1].

def rgba_to_hsla(r, g, b, alpha=1.0):

Converts a color given by its RGBA coordinates to HSLA coordinates (hue, saturation, lightness, alpha).

Each of the RGBA coordinates must be in the range [0, 1].

def rgba_to_hsva(r, g, b, alpha=1.0):

Converts a color given by its RGBA coordinates to HSVA coordinates (hue, saturation, value, alpha).

Each of the RGBA coordinates must be in the range [0, 1].

known_colors: dict =

Undocumented

palettes =

Undocumented