wxPalette

A palette is a table that maps pixel values to RGB colours. It allows the colours of a low-depth bitmap, for example, to be mapped to the available colours in a display.

Derived from

wxGDIObject
wxObject

Include files

<wx/palette.h>

Predefined objects

Objects:

wxNullPalette

See also

wxDC::SetPalette, wxBitmap

Members

wxPalette::wxPalette
wxPalette::~wxPalette
wxPalette::Create
wxPalette::GetColoursCount
wxPalette::GetPixel
wxPalette::GetRGB
wxPalette::Ok
wxPalette::operator =
wxPalette::operator ==
wxPalette::operator !=

wxPalette::wxPalette

wxPalette()

Default constructor.

wxPalette(const wxPalette& palette)

Copy constructor. This uses reference counting so is a cheap operation.

wxPalette(int n, const unsigned char* red,
const unsigned char* green, const unsigned char* blue)

Creates a palette from arrays of size n, one for each red, blue or green component.

Parameters

palette

A pointer or reference to the palette to copy.

n

The number of indices in the palette.

red

An array of red values.

green

An array of green values.

blue

An array of blue values.

See also

wxPalette::Create

wxPerl note: In wxPerl the third constructor form takes as parameters 3 array references ( they must be of the same length ).

wxPalette::~wxPalette

~wxPalette()

Destructor.

wxPalette::Create

bool Create(int n, const unsigned char* red, const unsigned char* green, const unsigned char* blue)

Creates a palette from arrays of size n, one for each red, blue or green component.

Parameters

n

The number of indices in the palette.

red

An array of red values.

green

An array of green values.

blue

An array of blue values.

Return value

true if the creation was successful, false otherwise.

See also

wxPalette::wxPalette

wxPalette::GetColoursCount

int GetColoursCount() const

Returns number of entries in palette.

wxPalette::GetPixel

int GetPixel(const unsigned char red, const unsigned char green, const unsigned char blue) const

Returns a pixel value (index into the palette) for the given RGB values.

Parameters

red

Red value.

green

Green value.

blue

Blue value.

Return value

The nearest palette index.

See also

wxPalette::GetRGB

wxPalette::GetRGB

bool GetRGB(int pixel, const unsigned char* red, const unsigned char* green, const unsigned char* blue) const

Returns RGB values for a given palette index.

Parameters

pixel

The palette index.

red

Receives the red value.

green

Receives the green value.

blue

Receives the blue value.

Return value

true if the operation was successful.

See also

wxPalette::GetPixel

wxPerl note: In wxPerl this method takes only the pixel parameter and returns a 3-element list ( or the empty list upon failure ).

wxPalette::Ok

bool Ok() const

Returns true if palette data is present.

wxPalette::operator =

wxPalette& operator =(const wxPalette& palette)

Assignment operator, using reference counting. Returns a reference to 'this'.

wxPalette::operator ==

bool operator ==(const wxPalette& palette)

Equality operator. Two palettes are equal if they contain pointers to the same underlying palette data. It does not compare each attribute, so two independently-created palettes using the same parameters will fail the test.

wxPalette::operator !=

bool operator !=(const wxPalette& palette)

Inequality operator. Two palettes are not equal if they contain pointers to different underlying palette data. It does not compare each attribute.