Usage
renderPlot(expr, width = "auto", height = "auto",
    res = 72, ..., env = parent.frame(), quoted = FALSE,
    func = NULL)Arguments
expr
An expression that generates a plot.
width
The width of the rendered plot, in pixels;
  or 'auto' to use the offsetWidth of the
  HTML element that is bound to this plot.  You can also
  pass in a function that returns the width in pixels or
  'auto'; in the 
height
The height of the rendered plot, in pixels;
  or 'auto' to use the offsetHeight of the
  HTML element that is bound to this plot.  You can also
  pass in a function that returns the width in pixels or
  'auto'; in th
res
Resolution of resulting plot, in pixels per
  inch. This value is passed to png. Note
  that this affects the resolution of PNG rendering in R;
  it won't change the actual ppi of the browser. ...
Arguments to be passed through to
  png.  These can be used to set
  the width, height, background color, etc. env
The environment in which to evaluate
  expr.
quoted
Is expr a quoted expression (with
  quote())? This is useful if you want to save an
  expression in a variable.
func
A function that generates a plot (deprecated;
  use expr instead).