more mouse interaction features for Qt plotting widget * graphics.in.h, graphics.cc (figure::properties::__mouse_mode__, figure::properties::__pan_mode__, figure::properties::__rotate_mode__, figure::properties::__zoom_mode__): New properties. (figure::properties::set___mouse_mode__): New function. (axes::properties::pan, axes::properties::rotate3d, axes::properties::zoom): New functions. Handle zoom, and pan modes. (axes::properties::clear_zoom_stack): New arg, do_unzoom. Conditionally call unzoom. (axes::properties::unzoom): Also restore view property. (axes::properties::rotate_view): Conditionall save state to zoom stack. (axes::properties::push_zoom_stack): New function. (axes::properties::pan, axes::properties::rotate3d): Delete properties. (axes::properties::update_xlim, axes::properties::update_ylim, axes::properties::update_zlim): Don't clear zoom stack. Delete do_clr_zoom argument. (axes::properties::set_pan, axes::properties::set_rotate3d): Delete. (F__zoom__): New function. * Canvas.h, Canvas.cc (Canvas::toggleAxes, Canvas::toggleGrid): New pure virtual functions. (Canvas::setCursor, Canvas::canvasToggleAxes, Canvas::canvasToggleGrid, Canvas::canvasMouseDoubleClickEvent, Canvas::canvasWheelEvent): New functions. (zoom_enabled, pan_enabled, pan_mode, rotate_enabled, rotate_mode): New static functions. (Canvas::canvasMouseMoveEvent): Call axes::properties::rotate3d to do rotation. Handle panning. (Canvas::canvasMousePressEvent): Also handle "unzoom" action when in pan and rotate modes. (Canvas::canvasMouseReleaseEvent): Zoom by factor if mouse has not moved from mouse press event. * Figure.h, Figure.cc (MouseMode): New enum value, TextMode. (Figure::m_mouseMode, Figure::m_lastMouseMode): Delete member variables. (Figure::mouseMode, Figure::setMouseMode): Get info from and save info to figure properties. (Figure::updateFigureToolBarAndMenuBar, Figure::toggleAxes, Figure::toggleGrid): New functions. (Figure::m_mouseModeGroup): New member variable. (Figure::createFigureToolBarAndMenuBar): Add actions for toggling Axes and Grid. Maintain pointer to MouseModeActionGroup. (mouse_mode_to_string, mouse_mode_from_string): New functions. * GLCanvas.h, GLCanvas.cc (GLCanvas::toggleAxes, GLCanvas::ToggleGrid, GLCanvas::mouseDoubleClickEvent, GLCanvas::wheelEvent): New functions. * MouseModeActionGroup.h, MouseModeActionGroup.cc (MouseModeActionGroup::mouseMode): Delete. (MouseModeActionGroup::setMode): New function. (MouseModeActionGroup::MouseModeActionGroup): Also include action to insert text in the list. * figure.m: Set default pan, rotate, and zoom mode properties for the figure object. * pan.m, rotate3d.m, zoom.m: Improve compatibility with Matlab. Set mode properties for figure. * __init_fltk__.cc: Cope with changes to graphics properties.

## Copyright (C) 2010-2013 Kai Habel
##
## This file is part of Octave.
##
## Octave is free software; you can redistribute it and/or modify it
## under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 3 of the License, or (at
## your option) any later version.
##
## Octave is distributed in the hope that it will be useful, but
## WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
## General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with Octave; see the file COPYING.  If not, see
## <http://www.gnu.org/licenses/>.

## -*- texinfo -*-
## @deftypefn  {Function File} {} saveas (@var{h}, @var{filename})
## @deftypefnx {Function File} {} saveas (@var{h}, @var{filename}, @var{fmt})
## Save graphic object @var{h} to the file @var{filename} in graphic
## format @var{fmt}.
##
## @var{fmt} should be one of the following formats:
##
## @table @code
##   @item ps
##     PostScript
##
##   @item eps
##     Encapsulated PostScript
##
##   @item jpg
##     JPEG Image
##
##   @item png
##     PNG Image
##
##   @item emf
##     Enhanced Meta File
##
##   @item pdf
##     Portable Document Format
## @end table
##
## All device formats specified in @code{print} may also be used.  If
## @var{fmt} is omitted it is extracted from the extension of @var{filename}.
## The default format is @qcode{"pdf"}.
##
## @example
## @group
## clf ();
## surf (peaks);
## saveas (1, "figure1.png");
## @end group
## @end example
##
## @seealso{print, hgsave, orient}
## @end deftypefn

## Author: Kai Habel

function  saveas (h, filename, fmt = "pdf")

  if ((nargin != 2) && (nargin != 3))
    print_usage ();
  endif

  if (ishandle (h))
    if (isfigure (h))
      fig = h;
    else
      fig = ancestor (h, "figure");
    endif
  else
    error ("saveas: first argument H must be a graphics handle");
  endif

  if (!ischar (filename))
    error ("saveas: FILENAME must be a string");
  endif

  if (nargin == 2)
    [~, ~, ext] = fileparts (filename);
    if (!isempty (ext))
      fmt = ext(2:end);
    endif
  endif

  if (nargin == 3)
    if (!ischar (filename))
      error ("saveas: EXT must be a string");
    endif

    [~, ~, ext] = fileparts (filename);

    if (isempty (ext))
      filename = strcat (filename, ".", fmt);
    endif
  endif

  prt_opt = strcat ("-d", tolower (fmt));

  print (fig, filename, prt_opt);

endfunction