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