quartz               package:grDevices               R Documentation

_M_a_c_O_S _X _Q_u_a_r_t_z _D_e_v_i_c_e

_D_e_s_c_r_i_p_t_i_o_n:

     'quartz' starts a graphics device driver for the Mac OS X System.
     It supports plotting both to the screen (the default) and to
     various graphics file formats.

_U_s_a_g_e:

     quartz(title, width, height, pointsize, family, fontsmooth, antialias,
            type, file = NULL, bg, canvas, dpi)

     quartz.options(..., reset = FALSE)

_A_r_g_u_m_e_n_t_s:

   title: title for the Quartz window (applies to on-screen output
          only), default '"Quartz %d"'.  A C-style format for an
          integer will be substituted by the device number (see the
          'file' argument to 'postscript' for further details).

   width: the width of the plotting area in inches.  Default '7'.

  height: the height of the plotting area in inches.  Default '7'.

pointsize: the default pointsize to be used.  Default '12'.

  family: this is the family name of the font that will be used by the
          device.  Default '"Helvetica"'.

fontsmooth: logical specifying if fonts should be smoothed. Default
          'TRUE'.  Currently unused.

antialias: whether to use antialiasing.  Default 'TRUE'.

    type: the type of output to use.  See 'Details' for more
          information.  Default '"native"'.

    file: an optional target for the graphics device. The default,
          'NULL', selects a default name where one is needed.  See
          'Details' for more information.

      bg: the initial background colour to use for the device.  Default
          '"transparent"'.  An opaque colour such as '"white"' will
          normally be required on off-screen types that support
          transparency such as '"png'" and '"tiff"'.

  canvas: canvas colour to use for an on-screen device.  Default
          '"white"', and will be forced to be an opaque colour.

     dpi: resolution of the output.  The default ('NA_real_') for an
          on-screen display defaults to the resolution of the main
          screen, and to 72 dpi otherwise.  See 'Details'.

     ...: Any of the arguments to 'quartz' except 'file'.

   reset: logical: should the defaults be reset to their defaults?

_D_e_t_a_i_l_s:

     The defaults for all but one of the arguments of 'quartz' are set
     by 'quartz.options': the 'Arguments' section gives the
     'factory-fresh' defaults.

     The Quartz graphics device supports a variety of output types.
     On-screen output types are '""' or '"native"' (picks the best
     possible on-screen output), '"Cocoa"' (Mac OS X 10.4 and later)
     and '"Carbon"' (not currently implemented - potentially Mac OS X
     10.3 and earlier).   Off-screen output types produce output files
     and utilize the 'file' argument. 'type = "pdf"' gives PDF output.
     The following bitmap formats may be supported (on OS X 10.4 and
     later): '"png"', '"jpeg"', '"jpg"', '"jpeg2000"', '"tif"',
     '"tiff"', '"gif"', '"psd"' (Adobe Photoshop), '"bmp"' (Windows
     bitmap), '"sgi"' and '"pict"'.  (The availability of some formats
     is OS-version-dependent.)

     To reproduce the default of older Quartz devices on-screen, set
     'dpi = 72' (for a permanent solution set 'quartz.options(dpi =
     72)').

     The 'file' argument is used for off-screen drawing.  The actual
     file is only created when the device is closed (e.g. using
     'dev.off()').  For the bitmap devices, the page number is
     substituted if a C integer format is included in the character
     string, e.g. 'Rplot%03d.png'.  (The result must be less than
     'PATH_MAX' characters long, and may be truncated if not. See
     'postscript' for further details.)  If a 'file' argument is not
     supplied, the default is 'Rplots.pdf' or 'Rplot%03d.type'.

     If a device-independent R graphics font family is specified (e.g.,
     via 'par(family=)' in the graphics package), the Quartz device
     makes use of the Quartz font database (see 'quartzFonts') to
     convert the R graphics font family to a Quartz-specific font
     family description.

     On-screen devices are launched with a semi-transparent canvas. 
     Once a new plot is created, the canvas is first painted with the
     'canvas' colour and then the current background colour (which can
     be transparent or semi-transparent).  Off-screen devices have no
     canvas colour, and so start with a transparent background where
     possible (e.g. 'type="png"' and 'type="tiff"') - otherwise it
     appears that a solid white canvas is assumed in the Quartz code.

     'title' can be used for on-screen output.  It must be a single
     character string with an optional integer printf-style format that
     will be substituted by the device number.  It is also optionally
     used (without a format) to give a title to a PDF file.

     Calling 'quartz()' sets '.Device' to '"quartz"' for on-scren
     devices and to '"quartz_off_screen"' otherwise.

_C_o_n_v_e_n_t_i_o_n_s:

     This section describes the implementation of the conventions for
     graphics devices set out in the "R Internals Manual".


        *  The default device size is 7 inches square.

        *  Font sizes are in big points.

        *  The default font family is Arial.

        *  Line widths are a multiple of 1/96 inch with no minimum set
           by R.

        *  Circle radii are real-valued with no minimum set by R.

        *  Colour interpretation is by the viewer, including the screen
           display.

_S_e_e _A_l_s_o:

     'quartzFonts', 'Devices'.

     'png' for way to access the bitmap types of this device via R's
     standard bitmap devices.

_E_x_a_m_p_l_e_s:

     ## Not run: 
     ## put something this is your .Rprofile to customize the defaults
     setHook(packageEvent("grDevices", "onLoad"),
             function(...) grDevices::quartz.options(width=8, height=6,
                                                     pointsize=10))
     ## End(Not run)

