Function interp_gpar 

fn interp_gpar(
    _args: &[RValue],
    named: &[(String, RValue)],
    _context: &BuiltinContext<'_>,
) -> Result<RValue, RError>

Create a graphical parameter object (gpar) for grid graphics.

@param col line color @param fill fill color @param lwd line width @param lty line type @param fontsize font size in points @param font font face (1=plain, 2=bold, 3=italic, 4=bold-italic) @param fontfamily font family name @param lineheight line height multiplier @param cex character expansion factor @param alpha alpha transparency @return a gpar object (list with class “gpar”)