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The default parameter settings are defined by the ROOT viewport, which
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The default parameter settings are defined by the ROOT viewport, which
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takes its settings from the graphics device. These defaults may
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takes its settings from the graphics device. These defaults may
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differ between devices (e.g., the default \code{fill} setting is
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differ between devices (e.g., the default \code{fill} setting is
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different for a PNG device compared to a PDF device).
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different for a PNG device compared to a PDF device).
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Valid parameter names are:
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Valid parameter names are:
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\tabular{ll}{
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\tabular{ll}{
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col \tab Colour for lines and borders. \cr
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col \tab Colour for lines and borders. \cr
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fill \tab Colour for filling rectangles, polygons, ... \cr
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fill \tab Colour for filling rectangles, polygons, ... \cr
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alpha \tab Alpha channel for transparency \cr
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alpha \tab Alpha channel for transparency \cr
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}
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}
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For more details of many of these, see the help for the corresponding
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For more details of many of these, see the help for the corresponding
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graphical parameter \code{\link{par}} in base graphics. (This may
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graphical parameter \code{\link{par}} in base graphics. (This may
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have a slightly different name, e.g. \code{lend}, \code{ljoin},
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have a slightly different name, e.g. \code{lend}, \code{ljoin},
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\code{lmitre}, \code{family}.)
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\code{lmitre}, \code{family}.)
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Colours can be specified in one of the forms returned by
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Colours can be specified in one of the forms returned by
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\code{\link{rgb}}, as a name (see \code{\link{colors}}) or as a
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\code{\link{rgb}}, as a name (see \code{\link{colors}}) or as a
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non-negative integer index into the current \link{palette} (with zero
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non-negative integer index into the current \link{palette} (with zero
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being taken as transparent). (Prior to \R 3.0.0 negative integer
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being taken as transparent). (Prior to \R 3.0.0 negative integer
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values were allowed and taken as transparent: they are now an error.)
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values were allowed and taken as transparent: they are now an error.)
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The \code{alpha} setting is combined with the alpha channel for
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The \code{alpha} setting is combined with the alpha channel for
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individual colours by multiplying (with both alpha settings
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individual colours by multiplying (with both alpha settings
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normalised to the range 0 to 1).
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normalised to the range 0 to 1).
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The size of text is \code{fontsize}*\code{cex}. The size of a line
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The size of text is \code{fontsize}*\code{cex}. The size of a line
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