Function interp_viewport 

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

Create a viewport object for grid graphics.

@param x horizontal position (default: unit(0.5, “npc”)) @param y vertical position (default: unit(0.5, “npc”)) @param width viewport width (default: unit(1, “npc”)) @param height viewport height (default: unit(1, “npc”)) @param just justification (“centre”, “left”, “right”, “top”, “bottom”) @param xscale numeric c(min, max) for x-axis scale @param yscale numeric c(min, max) for y-axis scale @param angle rotation angle in degrees @param clip clipping (“on”, “off”, “inherit”) @param gp graphical parameters (gpar object) @param layout a grid layout @param name viewport name for navigation @return a viewport object (list with class “viewport”)