docs/latex/wx/palette.tex

   1 \section{\class{wxPalette}}\label{wxpalette}
   2
   3 A palette is a table that maps pixel values to RGB colours. It allows the colours
   4 of a low-depth bitmap, for example, to be mapped to the available colours in a display.
   5
   6 TODO: topic overview for wxPalette.
   7
   8 \wxheading{Derived from}
   9
  10 \helpref{wxGDIObject}{wxgdiobject}\\
  11 \helpref{wxObject}{wxobject}
  12
  13 \wxheading{See also}
  14
  15 \helpref{wxDC::SetPalette}{wxdcsetpalette}, \helpref{wxBitmap}{wxbitmap}
  16
  17 \latexignore{\rtfignore{\wxheading{Members}}}
  18
  19 \membersection{wxPalette::wxPalette}\label{wxpaletteconstr}
  20
  21 \func{}{wxPalette}{\void}
  22
  23 Default constructor.
  24
  25 \func{}{wxPalette}{\param{const wxPalette\&}{ palette}}
  26
  27 Copy constructor. This uses reference counting so is a cheap operation.
  28
  29 \func{}{wxPalette}{\param{int}{ n}, \param{const unsigned char* }{red},\\
  30  \param{const unsigned char* }{green}, \param{const unsigned char* }{blue}}
  31
  32 Creates a palette from arrays of size {\it n}, one for each
  33 red, blue or green component.
  34
  35 \wxheading{Parameters}
  36
  37 \docparam{palette}{A pointer or reference to the palette to copy.}
  38
  39 \docparam{n}{The number of indices in the palette.}
  40
  41 \docparam{red}{An array of red values.}
  42
  43 \docparam{green}{An array of green values.}
  44
  45 \docparam{blue}{An array of blue values.}
  46
  47 \wxheading{See also}
  48
  49 \helpref{wxPalette::Create}{wxpalettecreate}
  50
  51 \membersection{wxPalette::\destruct{wxPalette}}
  52
  53 \func{}{\destruct{wxPalette}}{\void}
  54
  55 Destructor.
  56
  57 \membersection{wxPalette::Create}\label{wxpalettecreate}
  58
  59 \func{bool}{Create}{\param{int}{ n}, \param{const unsigned char* }{red},\rtfsp
  60  \param{const unsigned char* }{green}, \param{const unsigned char* }{blue}}
  61
  62 Creates a palette from arrays of size {\it n}, one for each
  63 red, blue or green component.
  64
  65 \wxheading{Parameters}
  66
  67 \docparam{n}{The number of indices in the palette.}
  68
  69 \docparam{red}{An array of red values.}
  70
  71 \docparam{green}{An array of green values.}
  72
  73 \docparam{blue}{An array of blue values.}
  74
  75 \wxheading{Return value}
  76
  77 TRUE if the creation was successful, FALSE otherwise.
  78
  79 \wxheading{See also}
  80
  81 \helpref{wxPalette::wxPalette}{wxpaletteconstr}
  82
  83 \membersection{wxPalette::GetPixel}\label{wxpalettegetpixel}
  84
  85 \constfunc{int}{GetPixel}{\param{const unsigned char }{red}, \param{const unsigned char }{green},\rtfsp
  86  \param{const unsigned char }{blue}}
  87
  88 Returns a pixel value (index into the palette) for the given RGB values.
  89
  90 \wxheading{Parameters}
  91
  92 \docparam{red}{Red value.}
  93
  94 \docparam{green}{Green value.}
  95
  96 \docparam{blue}{Blue value.}
  97
  98 \wxheading{Return value}
  99
 100 The nearest palette index.
 101
 102 \wxheading{See also}
 103
 104 \helpref{wxPalette::GetRGB}{wxpalettegetrgb}
 105
 106 \membersection{wxPalette::GetRGB}\label{wxpalettegetrgb}
 107
 108 \constfunc{bool}{GetPixel}{\param{int}{ pixel}, \param{const unsigned char* }{red}, \param{const unsigned char* }{green},\rtfsp
 109  \param{const unsigned char* }{blue}}
 110
 111 Returns RGB values for a given palette index.
 112
 113 \wxheading{Parameters}
 114
 115 \docparam{pixel}{The palette index.}
 116
 117 \docparam{red}{Receives the red value.}
 118
 119 \docparam{green}{Receives the green value.}
 120
 121 \docparam{blue}{Receives the blue value.}
 122
 123 \wxheading{Return value}
 124
 125 TRUE if the operation was successful.
 126
 127 \wxheading{See also}
 128
 129 \helpref{wxPalette::GetPixel}{wxpalettegetpixel}
 130
 131 \membersection{wxPalette::Ok}\label{wxpaletteok}
 132
 133 \constfunc{bool}{Ok}{\void}
 134
 135 Returns TRUE if palette data is present.
 136
 137 \membersection{wxPalette::operator $=$}\label{wxpaletteassignment}
 138
 139 \func{wxPalette\&}{operator $=$}{\param{const wxPalette\& }{palette}}
 140
 141 Assignment operator, using reference counting. Returns a reference
 142 to `this'.
 143
 144 \membersection{wxPalette::operator $==$}\label{wxpaletteequals}
 145
 146 \func{bool}{operator $==$}{\param{const wxPalette\& }{palette}}
 147
 148 Equality operator. Two palettes are equal if they contain pointers
 149 to the same underlying palette data. It does not compare each attribute,
 150 so two independently-created palettes using the same parameters will
 151 fail the test.
 152
 153 \membersection{wxPalette::operator $!=$}\label{wxpalettenotequals}
 154
 155 \func{bool}{operator $!=$}{\param{const wxPalette\& }{palette}}
 156
 157 Inequality operator. Two palettes are not equal if they contain pointers
 158 to different underlying palette data. It does not compare each attribute.
 159
 160