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Color support in XAML-Math

XAML-Math supports standard LaTeX commands: \color for foreground color, and \colorbox for background color.

The commands also support additional syntax for color definitions. Standard LaTeX only allows to use predefined colors or colors defined in the same document. XAML-Math allows immediate color definition in the command arguments instead.

The full color command syntax is:

\command [mode] {color} {text}

Where:

  • command is either color or colorbox
  • mode is an optional argument that could be one of
    • gray
    • RGB, rgb, ARGB, argb, RGBA, rgba
    • cmyk
    • HTML
  • color is either a predefined color name if the mode argument wasn't provided, or a color definition according to the mode argument

Some of the modes accepts multiple numbers separated by comma ,; whitespace is allowed around the comma, before first and after the last element in the list.

Default mode (when no mode was provided)

In the default mode, color should be a predefined color name. Predefined colors are stored in the PredefinedColors.xml file from the XAML-Math resources. Additionally, this mode accepts an opacity index in range from 0.0 to 1.0. Examples:

\color{red}{without opacity}
\color{red, 0.5}{with opacity}

gray mode

gray mode accepts a grayscale tone in range from 0.0 to 1.0. Additionally, this mode accepts an opacity index in range from 0.0 to 1.0. Examples:

\color[gray]{0.5}{without opacity}
\color[gray]{0.5,0.5}{with opacity}

RGB-based modes

There're six RGB-based modes: capital ones (RGB, RGBA, ARGB) accept three (or four with opacity) comma-separated values in range from 0 to 255, lowercase ones (rgb, rgba, argb) accept three (or four) comma-separated values in range from 0.0 to 1.0. ARGB accepts opacity index first, RGBA accepts it last. Examples:

\colorbox[rgb]{0,0,0}{text}
\colorbox[rgba]{0,0,0, 0.5}{opacity = 0.5}
\colorbox[argb]{0.5, 0,0,0}{opacity = 0.5}
\colorbox[RGB]{255,255,255}{text}
\colorbox[RGBA]{255,255,255,128}{opacity = 128}
\colorbox[ARGB]{128, 255,255,255}{opacity = 128}

CMYK mode

cmyk mode accepts four (or five with opacity) parameters in the range from 0 to 1 for the CMYK color model. Examples:

\colorbox[cmyk]{0,0,0,0}{text}
\colorbox[cmyk]{0,0,0,0, 0.5}{opacity = 0.5}

HTML mode

HTML mode accepts six or eight hexadecimal digits, in the latter case last two should be opacity. Examples:

\color[HTML]{FF0000}{red text}
\color[HTML]{FF000000}{fully transparent red text}