wx.Colour¶

A colour is an object representing a combination of Red, Green, and Blue (RGB) intensity values and an Alpha value, and is used to determine drawing colours.

See the entry for wx.ColourDatabase for how a pointer to a predefined, named colour may be returned instead of creating a new colour.

Valid RGB values are in the range 0 to 255.

You can retrieve the current system colour settings with wx.SystemSettings.

Channel Accessor Functions¶

Note that this class provides pairs of functions for each of the colour channels, i.e. red, green, blue and alpha values. The one word functions Red, Green, Blue and Alpha return the values of type unsigned char , while GetRed, GetGreen, GetBlue and GetAlpha returns the same value as unsigned int . According to the C++ integer promotion rules, the result of any arithmetic expression involving the former will be (signed) int , while that of the latter will be unsigned , which is what would be commonly expected, so the latter family of functions should be typically preferred (but they are only available since wxWidgets 3.1.6).

Class Hierarchy¶

Inheritance diagram for class Colour:

Methods Summary¶

`__init__`	Default constructor.
`Alpha`	Returns the alpha value, on platforms where alpha is not yet supported, this always returns `wx.ALPHA_OPAQUE`.
`AlphaBlend`	Blend colour, taking alpha into account.
`Blue`	Returns the blue intensity.
`ChangeLightness`	wx.Colour wrapper for ChangeLightness(r,g,b,ialpha).
`Get`	Returns the `RGB` intensity values as a tuple, optionally the alpha value as well.
`GetAlpha`	Returns the alpha value, on platforms where alpha is not yet supported, this always returns `wx.ALPHA_OPAQUE`.
`GetAsString`	Converts this colour to a String using the given flags.
`GetBlue`	Returns the blue intensity as int.
`GetGreen`	Returns the green intensity as int.
`GetIM`	Returns an immutable representation of the `wx.Colour` object, based on `namedtuple`.
`GetLuminance`	Return the perceived brightness of the colour.
`GetPixel`
`GetRGB`	Gets the `RGB` or `RGBA` colour values as a single 32 bit value.
`GetRGBA`	Gets the `RGB` or `RGBA` colour values as a single 32 bit value.
`GetRed`	Returns the red intensity as int.
`Green`	Returns the green intensity.
`IsOk`	Returns `True` if the colour object is valid (the colour has been initialised with `RGB` values).
`IsSolid`	Returns `True` if the color can be described using `RGB` values, i.e.
`MakeDisabled`	Make a disabled version of this colour.
`MakeGrey`	Create a grey colour from (in/out) rgb parameters using integer arithmetic.
`MakeMono`	Assigns the same value to r, g, b: 0 if on is `false` , 255 otherwise.
`Red`	Returns the red intensity.
`Set`	Sets the `RGB` intensity values using the given values (first overload), extracting them from the packed long (second overload), using the given string (third overload).
`SetRGB`	Sets the `RGB` or `RGBA` colour values from a single 32 bit value.
`SetRGBA`	Sets the `RGB` or `RGBA` colour values from a single 32 bit value.
`__bool__`
`__getitem__`
`__len__`
`__nonzero__`
`__reduce__`
`__repr__`
`__setitem__`
`__str__`
`_copyFrom`	For internal use only.
`__ne__`	Tests the inequality of two colours by comparing individual red, green, blue intensities and alpha values.
`__eq__`	Tests the equality of two colours by comparing individual red, green, blue intensities and alpha values.

Properties Summary¶

`Pixel`	See `GetPixel`
`RGB`	See `GetRGB` and `SetRGB`
`RGBA`	See `GetRGBA` and `SetRGBA`
`alpha`	See `Alpha`
`blue`	See `Blue`
`green`	See `Green`
`red`	See `Red`

Class API¶

class wx.Colour(Object)¶

Possible constructors:

Colour()

Colour(red, green, blue, alpha=ALPHA_OPAQUE)

Colour(colRGB)

Colour(colour)

A colour is an object representing a combination of Red, Green, and Blue (RGB) intensity values and an Alpha value, and is used to determine drawing colours.

Methods¶

__init__(self, *args, **kw)¶

Overloaded Implementations:

__init__ (self)

Default constructor.

__init__ (self, red, green, blue, alpha=ALPHA_OPAQUE)

Parameters

red (int) – The red value.
green (int) – The green value.
blue (int) – The blue value.
alpha (int) – The alpha value. Alpha values range from 0 (wx``wx.ALPHA_TRANSPARENT``) to 255 (wx``wx.ALPHA_OPAQUE``).

__init__ (self, colRGB)

Parameters: colRGB (long) – A packed RGB value.

__init__ (self, colour)

Copy constructor.

Parameters: colour (wx.Colour) –

Alpha(self)¶

Returns the alpha value, on platforms where alpha is not yet supported, this always returns wx.ALPHA_OPAQUE.

Return type: int

See also

GetAlpha

static AlphaBlend(fg, bg, alpha)¶

Blend colour, taking alpha into account.

Parameters

fg (int) –
bg (int) –
alpha (float) –

Return type

int

New in version 2.9.0.

Blue(self)¶

Returns the blue intensity.

Return type: int

See also

GetBlue

ChangeLightness(self, *args, **kw)¶

Overloaded Implementations:

ChangeLightness (self, ialpha)

wx.Colour wrapper for ChangeLightness(r,g,b,ialpha).

Parameters: ialpha (int) –
Return type: wx.Colour

New in version 2.9.0.

ChangeLightness (r, g, b, ialpha)

Utility function that simply darkens or lightens a color, based on the specified percentage ialpha.

ialpha of 0 would be make the color completely black, 200 completely white and 100 would not change the color.

Parameters

r (int) –
g (int) –
b (int) –
ialpha (int) –

Return type

tuple

Returns

( r, g, b )

New in version 2.9.0.

Get(self, includeAlpha=True)¶

Returns the RGB intensity values as a tuple, optionally the alpha value as well.

Return type: tuple
Returns: ( r, g, b) or (r, g, b, a )

GetAlpha(self)¶

Returns the alpha value, on platforms where alpha is not yet supported, this always returns wx.ALPHA_OPAQUE.

Return type: int

New in version 4.1/wxWidgets-3.1.6.

GetAsString(self, flags=C2S_NAME|C2S_CSS_SYNTAX)¶

Converts this colour to a String using the given flags.

The supported flags are C2S_NAME , to obtain the colour name (e.g. wx.Colour == “red”), C2S_CSS_SYNTAX , to obtain the colour in the “rgb(r,g,b)” or “rgba(r,g,b,a)” syntax (e.g. wx.Colour == “rgba(255,0,0,0.333)”), and C2S_HTML_SYNTAX , to obtain the colour as “#” followed by 6 hexadecimal digits (e.g. wx.Colour == “#``FF0000``”).

This function returns empty string if the colour is not initialized (see IsOk ). Otherwise, the returned string is always non-empty, but the function asserts if the colour has alpha channel (i.e. is non opaque) but C2S_CSS_SYNTAX (which is the only one supporting alpha) is not specified in flags.

Parameters: flags (long) –
Return type: string

New in version 2.7.0.

Note

For non-solid (i.e. non-RGB) colour this function returns “rgb(??, ?? ??)” or “#??????”.

GetBlue(self)¶

Returns the blue intensity as int.

Return type: int

New in version 4.1/wxWidgets-3.1.6.

GetGreen(self)¶

Returns the green intensity as int.

Return type: int

New in version 4.1/wxWidgets-3.1.6.

GetIM(self)¶

Returns an immutable representation of the wx.Colour object, based on namedtuple.

This new object is hashable and can be used as a dictionary key, be added to sets, etc. It can be converted back into a real wx.Colour with a simple statement like this: obj = wx.Colour(imObj).

GetLuminance(self)¶

Return the perceived brightness of the colour.

This value is computed using the simple:

( 0.299*R + 0.587*G + 0.114*B )

formula with the coefficients taken from the RGB to YIQ conversion formula and R , G and B being the values of the corresponding colour channels normalized to 0..1 range, so that the return value is 0 for black and 1 for white.

Return type: float

New in version 4.1/wxWidgets-3.1.3.

GetPixel(self)¶

Return type: wx.IntPtr

GetRGB(self)¶

Gets the RGB or RGBA colour values as a single 32 bit value.

The returned value is of the same form as expected by SetRGB and SetRGBA .

Notice that GetRGB returns the value with 0 as its highest byte independently of the value actually returned by Alpha . So for a fully opaque colour, the return value of GetRGBA is 0xFFBBGGRR while that of GetRGB is 0x00BBGGRR .

Return type: wx.int

New in version 2.9.1.

GetRGBA(self)¶

Gets the RGB or RGBA colour values as a single 32 bit value.

The returned value is of the same form as expected by SetRGB and SetRGBA .

Notice that GetRGB returns the value with 0 as its highest byte independently of the value actually returned by Alpha . So for a fully opaque colour, the return value of GetRGBA is 0xFFBBGGRR while that of GetRGB is 0x00BBGGRR .

Return type: wx.int

New in version 2.9.1.

GetRed(self)¶

Returns the red intensity as int.

Return type: int

New in version 4.1/wxWidgets-3.1.6.

Green(self)¶

Returns the green intensity.

Return type: int

See also

GetGreen

IsOk(self)¶

Returns True if the colour object is valid (the colour has been initialised with RGB values).

Return type: bool

IsSolid(self)¶

Returns True if the color can be described using RGB values, i.e.

is solid, False if it is a pattern (currently only possible on macOS)

Return type: bool

New in version 4.1/wxWidgets-3.1.2.

MakeDisabled(self, *args, **kw)¶

Overloaded Implementations:

MakeDisabled (self, brightness=255)

Make a disabled version of this colour.

This method modifies the object in place and returns the object itself.

Parameters: brightness (int) –
Return type: wx.Colour

New in version 2.9.5.

MakeDisabled (r, g, b, brightness=255)

Create a disabled (dimmed) colour from (in/out) rgb parameters.

Parameters

r (int) –
g (int) –
b (int) –
brightness (int) –

Return type

tuple

Returns

( r, g, b )

New in version 2.9.0.

static MakeGrey(*args, **kw)¶

Overloaded Implementations:

MakeGrey (r, g, b)

Create a grey colour from (in/out) rgb parameters using integer arithmetic.

Parameters

r (int) –
g (int) –
b (int) –

Return type

tuple

Returns

( r, g, b )

New in version 2.9.0.

MakeGrey (r, g, b, weight_r, weight_g, weight_b)

Create a grey colour from (in/out) rgb parameters using floating point arithmetic.

Defaults to using the standard ITU-T BT.601 when converting to YUV, where every pixel equals (R weight_r) + (G weight_g) + (B weight_b).

Parameters

r (int) –
g (int) –
b (int) –
weight_r (float) –
weight_g (float) –
weight_b (float) –

Return type

tuple

Returns

( r, g, b )

New in version 2.9.0.

static MakeMono(on)¶

Assigns the same value to r, g, b: 0 if on is false , 255 otherwise.

Parameters: on (bool) –
Return type: tuple
Returns: ( r, g, b )

New in version 2.9.0.

Red(self)¶

Returns the red intensity.

Return type: int

See also

GetRed

Set(self, *args, **kw)¶

Sets the RGB intensity values using the given values (first overload), extracting them from the packed long (second overload), using the given string (third overload).

When using third form, Set accepts: colour names (those listed in wx.ColourDatabase), the CSS-like "rgb(r,g,b)" or "rgba(r,g,b,a)" syntax (case insensitive) and the HTML-like syntax: "#" followed by 6 hexadecimal digits for red, green, blue components.

Returns True if the conversion was successful, False otherwise.

New in version 2.7.0.

Overloaded Implementations:

Set (self, red, green, blue, alpha=ALPHA_OPAQUE)

Parameters

red (int) –
green (int) –
blue (int) –
alpha (int) –

Set (self, RGB)

Parameters: RGB (long) –

Set (self, str)

Parameters: str (string) –
Return type: bool

SetRGB(self, colRGB)¶

Sets the RGB or RGBA colour values from a single 32 bit value.

The arguments colRGB and colRGBA should be of the form 0x00BBGGRR and 0xAABBGGRR respectively where 0xRR , 0xGG , 0xBB and 0xAA are the values of the red, green, blue and alpha components.

Notice the right-to-left order of components!

Parameters: colRGB (wx.int) –

New in version 2.9.1.

See also

GetRGB , GetRGBA

SetRGBA(self, colRGBA)¶

Sets the RGB or RGBA colour values from a single 32 bit value.

The arguments colRGB and colRGBA should be of the form 0x00BBGGRR and 0xAABBGGRR respectively where 0xRR , 0xGG , 0xBB and 0xAA are the values of the red, green, blue and alpha components.

Notice the right-to-left order of components!

Parameters: colRGBA (wx.int) –

New in version 2.9.1.

See also

GetRGB , GetRGBA

__bool__(self)¶

Return type: int

__getitem__(self, idx)¶

__len__(self)¶

__nonzero__(self)¶

Return type: int

__reduce__(self)¶

__repr__(self)¶

__setitem__(self, idx, val)¶

__str__(self)¶

_copyFrom(self, other)¶: For internal use only.

__ne__(self)¶

Tests the inequality of two colours by comparing individual red, green, blue intensities and alpha values.

Parameters: colour (wx.Colour) –

__eq__(self)¶

Tests the equality of two colours by comparing individual red, green, blue intensities and alpha values.

Parameters: colour (wx.Colour) –

Properties¶

Pixel¶: See GetPixel

RGB¶: See GetRGB and SetRGB

RGBA¶: See GetRGBA and SetRGBA

alpha¶: See Alpha

blue¶: See Blue

green¶: See Green

red¶: See Red

Navigation

wx.Colour¶

Channel Accessor Functions¶

Class Hierarchy¶

Methods Summary¶

Properties Summary¶

Class API¶

Methods¶

Properties¶