plplot extcairo gtkmm drawingarea

ax_cxx_compile_stdcxx_11.m4

# ============================================================================
#  http://www.gnu.org/software/autoconf-archive/ax_cxx_compile_stdcxx_11.html
# ============================================================================
#
# SYNOPSIS
#
#   AX_CXX_COMPILE_STDCXX_11([ext|noext],[mandatory|optional])
#
# DESCRIPTION
#
#   Check for baseline language coverage in the compiler for the C++11
#   standard; if necessary, add switches to CXXFLAGS to enable support.
#
#   The first argument, if specified, indicates whether you insist on an
#   extended mode (e.g. -std=gnu++11) or a strict conformance mode (e.g.
#   -std=c++11).  If neither is specified, you get whatever works, with
#   preference for an extended mode.
#
#   The second argument, if specified 'mandatory' or if left unspecified,
#   indicates that baseline C++11 support is required and that the macro
#   should error out if no mode with that support is found.  If specified
#   'optional', then configuration proceeds regardless, after defining
#   HAVE_CXX11 if and only if a supporting mode is found.
#
# LICENSE
#
#   Copyright (c) 2008 Benjamin Kosnik <bkoz@redhat.com>
#   Copyright (c) 2012 Zack Weinberg <zackw@panix.com>
#   Copyright (c) 2013 Roy Stogner <roystgnr@ices.utexas.edu>
#   Copyright (c) 2014, 2015 Google Inc.; contributed by Alexey Sokolov <sokolov@google.com>
#
#   Copying and distribution of this file, with or without modification, are
#   permitted in any medium without royalty provided the copyright notice
#   and this notice are preserved. This file is offered as-is, without any
#   warranty.

#serial 11

m4_define([_AX_CXX_COMPILE_STDCXX_11_testbody], [[
  template <typename T>
    struct check
    {
      static_assert(sizeof(int) <= sizeof(T), "not big enough");
    };

    struct Base {
    virtual void f() {}
    };
    struct Child : public Base {
    virtual void f() override {}
    };

    typedef check<check<bool>> right_angle_brackets;

    int a;
    decltype(a) b;

    typedef check<int> check_type;
    check_type c;
    check_type&& cr = static_cast<check_type&&>(c);

    auto d = a;
    auto l = [](){};
    // Prevent Clang error: unused variable 'l' [-Werror,-Wunused-variable]
    struct use_l { use_l() { l(); } };

    // http://stackoverflow.com/questions/13728184/template-aliases-and-sfinae
    // Clang 3.1 fails with headers of libstd++ 4.8.3 when using std::function because of this
    namespace test_template_alias_sfinae {
        struct foo {};

        template<typename T>
        using member = typename T::member_type;

        template<typename T>
        void func(...) {}

        template<typename T>
        void func(member<T>*) {}

        void test();

        void test() {
            func<foo>(0);
        }
    }
]])

AC_DEFUN([AX_CXX_COMPILE_STDCXX_11], [dnl
  m4_if([$1], [], [],
        [$1], [ext], [],
        [$1], [noext], [],
        [m4_fatal([invalid argument `$1' to AX_CXX_COMPILE_STDCXX_11])])dnl
  m4_if([$2], [], [ax_cxx_compile_cxx11_required=true],
        [$2], [mandatory], [ax_cxx_compile_cxx11_required=true],
        [$2], [optional], [ax_cxx_compile_cxx11_required=false],
        [m4_fatal([invalid second argument `$2' to AX_CXX_COMPILE_STDCXX_11])])
  AC_LANG_PUSH([C++])dnl
  ac_success=no
  AC_CACHE_CHECK(whether $CXX supports C++11 features by default,
  ax_cv_cxx_compile_cxx11,
  [AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_11_testbody])],
    [ax_cv_cxx_compile_cxx11=yes],
    [ax_cv_cxx_compile_cxx11=no])])
  if test x$ax_cv_cxx_compile_cxx11 = xyes; then
    ac_success=yes
  fi

  m4_if([$1], [noext], [], [dnl
  if test x$ac_success = xno; then
    for switch in -std=gnu++11 -std=gnu++0x; do
      cachevar=AS_TR_SH([ax_cv_cxx_compile_cxx11_$switch])
      AC_CACHE_CHECK(whether $CXX supports C++11 features with $switch,
                     $cachevar,
        [ac_save_CXXFLAGS="$CXXFLAGS"
         CXXFLAGS="$CXXFLAGS $switch"
         AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_11_testbody])],
          [eval $cachevar=yes],
          [eval $cachevar=no])
         CXXFLAGS="$ac_save_CXXFLAGS"])
      if eval test x\$$cachevar = xyes; then
        CXXFLAGS="$CXXFLAGS $switch"
        ac_success=yes
        break
      fi
    done
  fi])

  m4_if([$1], [ext], [], [dnl
  if test x$ac_success = xno; then
    dnl HP's aCC needs +std=c++11 according to:
    dnl http://h21007.www2.hp.com/portal/download/files/unprot/aCxx/PDF_Release_Notes/769149-001.pdf
    for switch in -std=c++11 -std=c++0x +std=c++11; do
      cachevar=AS_TR_SH([ax_cv_cxx_compile_cxx11_$switch])
      AC_CACHE_CHECK(whether $CXX supports C++11 features with $switch,
                     $cachevar,
        [ac_save_CXXFLAGS="$CXXFLAGS"
         CXXFLAGS="$CXXFLAGS $switch"
         AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_11_testbody])],
          [eval $cachevar=yes],
          [eval $cachevar=no])
         CXXFLAGS="$ac_save_CXXFLAGS"])
      if eval test x\$$cachevar = xyes; then
        CXXFLAGS="$CXXFLAGS $switch"
        ac_success=yes
        break
      fi
    done
  fi])
  AC_LANG_POP([C++])
  if test x$ax_cxx_compile_cxx11_required = xtrue; then
    if test x$ac_success = xno; then
      AC_MSG_ERROR([*** A compiler with support for C++11 language features is required.])
    fi
  else
    if test x$ac_success = xno; then
      HAVE_CXX11=0
      AC_MSG_NOTICE([No compiler with C++11 support was found])
    else
      HAVE_CXX11=1
      AC_DEFINE(HAVE_CXX11,1,
                [define if the compiler supports basic C++11 syntax])
    fi

    AC_SUBST(HAVE_CXX11)
  fi
])

configure.ac

AC_INIT([plplot-blog],[0.1],[tom.schoonjans@me.com],,[https://tschoonj.github.io])
AC_PREREQ([2.60])
AC_CONFIG_SRCDIR([main.cpp])
AC_CONFIG_AUX_DIR([build-aux])
AM_INIT_AUTOMAKE([-Wall -Werror foreign])
AC_CANONICAL_HOST


#m4_pattern_allow([AS_TR_SH])
AC_CONFIG_MACRO_DIR([.])

AC_USE_SYSTEM_EXTENSIONS
m4_ifdef([AM_PROG_AR], [AM_PROG_AR])


AC_PROG_CC
if test `AS_BASENAME([$CC])` = $CC ; then
  AC_CHECK_PROG(CC_FULL, [$CC], $CC, [none])
  #this next line may never be reached...
  if test x$CC_FULL = "xnone" ; then
          AC_MSG_ERROR([no C compiler was found on the system.])
  fi
fi
AM_PROG_CC_C_O


AC_PROG_CXX
if test `AS_BASENAME([$CXX])` = $CXX ; then
  AC_CHECK_PROG(CXX_FULL, [$CXX], $CXX, [none])
  #this next line may never be reached...
  if test x$CXX_FULL = "xnone" ; then
          AC_MSG_ERROR([no C++ compiler was found on the system.])
  fi
fi

AX_CXX_COMPILE_STDCXX_11(ext, mandatory)

LDFLAGS_EXTRA=""
OS_WINDOWS=0
OS_WINDOWS_32=0
OS_WINDOWS_64=0

case "$host" in
	i686-*mingw*)
		OS_WINDOWS_32=1
		OS_WINDOWS=1
		;;
	x86_64-*mingw*)
		OS_WINDOWS_64=1
		OS_WINDOWS=1
		;;
esac

AC_SUBST(WINDRES_ARCH)

AC_SUBST(OS_WINDOWS)
AM_CONDITIONAL([OS_WINDOWS],[test x$OS_WINDOWS = x1])
AC_SUBST(OS_WINDOWS_32)
AM_CONDITIONAL([OS_WINDOWS_32],[test x$OS_WINDOWS_32 = x1])
AC_SUBST(OS_WINDOWS_64)
AM_CONDITIONAL([OS_WINDOWS_64],[test x$OS_WINDOWS_64 = x1])

#look for xraylib
#initialize pkg-config
PKG_PROG_PKG_CONFIG


#search for xraylib and other modules
PKG_CHECK_MODULES([gtkmm],gtkmm-3.0 >= 3.12.0)
PKG_CHECK_MODULES([plplotcxx], [plplot-c++], ,
 [PKG_CHECK_MODULES([plplotcxx], [plplotd-c++])])

#check for the extcairo device
result=
AC_MSG_CHECKING([for plplot extcairo device])
ac_save_CFLAGS="$CFLAGS"
CFLAGS=$plplotcxx_CFLAGS
AC_LANG_PUSH([C])
AC_TRY_COMPILE([
        #include <plDevs.h>
],[
#ifndef PLD_extcairo
  #error
#endif
],[
  result=yes
  AC_DEFINE([HAVE_EXTCAIRO], [], [extcairo found])
],[result=no])
AC_MSG_RESULT([$result])
if test x$result = xno ; then
  AC_MSG_ERROR([plplot must be built with the extcairo device!])
fi
AC_LANG_POP
CFLAGS="$ac_save_CFLAGS"





AC_CONFIG_FILES([Makefile])
AC_CONFIG_HEADERS([config.h])



AC_OUTPUT

main.cpp

#include <gtkmm/application.h>
#include <glibmm/miscutils.h>
#include <glib.h>
#include "PLplotWindow.h"
#include <valarray>



int main(int argc, char **argv) {
	Glib::set_application_name("plplot-test");
#if defined(G_OS_WIN32)
  //windows requires a bit more work. This example sets the PLPLOT_LIB environment variable
  //to ensure the PLplot data files are found at runtime
	gchar *installation_dir = g_win32_get_package_installation_directory_of_module(NULL);
	std::string path_to_plplot(Glib::build_filename(installation_dir, "Share", "plplot"));
	std::cout << "path to plplot: " << path_to_plplot << std::endl;
	Glib::setenv("PLPLOT_LIB", path_to_plplot, true);
	g_free(installation_dir);
#endif
	Glib::RefPtr<Gtk::Application> app = Gtk::Application::create(argc, argv, "eu.tomschoonjans.plplot");

  //valarrays are underestimated IMHO
  std::valarray<PLFLT> x_va(1000), y_va(1000);
  for (unsigned int i = 0 ; i < 1000 ; i++) {
    x_va[i] = 4*M_PI*i/999;
  }
  y_va = sin(x_va);

  std::vector<PLFLT> x(std::begin(x_va), std::end(x_va)),
    y(std::begin(y_va), std::end(y_va));
  std::string x_title("x"), y_title("y = sinx(x)");

	PLplotWindow window(x, y, x_title, y_title, "PLplotDrawingArea demonstration");

	return app->run(window);
}

Makefile.am

bin_PROGRAMS = plplot-test
plplot_test_SOURCES = main.cpp \
                      PLplotWindow.h \
                      PLplotWindow.cpp \
                      PLplotDrawingArea.h \
                      PLplotDrawingArea.cpp
plplot_test_CPPFLAGS= $(plplotcxx_CFLAGS) $(gtkmm_CFLAGS)
plplot_test_LDADD = $(plplotcxx_LIBS) $(gtkmm_LIBS)

PLplotDrawingArea.cpp

#include "PLplotDrawingArea.h"
#include <iostream>
#include <algorithm>
#include <gdkmm/general.h>
#include <cmath>

PLplotDrawingArea::PLplotDrawingArea(
  const std::vector<PLFLT> &_x,
  const std::vector<PLFLT> &_y,
  const std::string &_x_title,
  const std::string &_y_title,
  const std::string &_plot_title
) : x(_x),
    y(_y),
    x_title(_x_title),
    y_title(_y_title),
    plot_title(_plot_title),
    start_event{-1.0, -1.0},
    start_cairo{-1.0, -1.0},
    end_event{-1.0, -1.0},
    end_cairo{-1.0, -1.0},
    selecting(false),
    pls(0),
    x_pl_range{*(x.begin()), *(x.end()-1)},
    y_pl_range{*std::min_element(y.begin(), y.end()),
               *std::max_element(y.begin(), y.end())}
     {
  add_events(Gdk::POINTER_MOTION_MASK |
             Gdk::BUTTON_PRESS_MASK |
             Gdk::BUTTON_RELEASE_MASK);

  //connect our default signal handler
  this->signal_select_region().connect(sigc::mem_fun(*this,
             &PLplotDrawingArea::on_select_region));
}

void PLplotDrawingArea::on_select_region(double xmin, double xmax, double ymin, double ymax) {
  //this function does nothing
  //it is designed to be overridden by a derived class
}


void PLplotDrawingArea::set_region(double xmin, double xmax, double ymin, double ymax) {
  if (xmin == xmax && ymin == ymax) {
    //due to signal propagation, this function will actually be called twice on a double-click event,
    //the second time after the plot has already been resized to its normal geometry
    //this condition avoids the warning message...
    return;
  }
  if (xmin >= xmax || ymin >= ymax ||
      xmin < *(x.begin()) || xmax > *(x.end()-1) ||
      ymin < *std::min_element(y.begin(), y.end()) ||
      ymax > *std::max_element(y.begin(), y.end())) {
    g_warning("PLplotDrawingArea::set_region(): Invalid arguments");
    return;
  }
  x_pl_range[0] = xmin;
  x_pl_range[1] = xmax;
  y_pl_range[0] = ymin;
  y_pl_range[1] = ymax;

  this->get_window()->invalidate(true);
}

bool PLplotDrawingArea::on_button_press_event(GdkEventButton *event) {
  Gtk::Allocation allocation = get_allocation();
  const int width = allocation.get_width();
  const int height = allocation.get_height();

  start_event[0] = event->x;
  start_event[1] = event->y;
  start_cairo[0] = event->x;
  start_cairo[1] = height - 1.0 * event->y;
  end_event[0] = -1.0;
  end_event[1] = -1.0;
  end_cairo[0] = -1.0;
  end_cairo[1] = -1.0;

  //check if the starting coordinates are valid
  if (start_cairo[0] < x_cr_range[0] ||
      start_cairo[0] > x_cr_range[1] ||
      start_cairo[1] < y_cr_range[0] ||
      start_cairo[1] > y_cr_range[1]) {
    g_warning("PLplotDrawingArea::on_button_press_event(): Invalid starting position in on_button_press_event");
    selecting = false;
    return true;
  }

  this->get_window()->invalidate(true);

  selecting = true;

  return false;
}

bool PLplotDrawingArea::on_button_release_event(GdkEventButton *event) {
  if (!selecting)
    return true;

  Gtk::Allocation allocation = get_allocation();
  const int width = allocation.get_width();
  const int height = allocation.get_height();

  end_event[0] = event->x;
  end_event[1] = event->y;
  end_cairo[0] = event->x;
  end_cairo[1] = height - 1.0 * event->y;

  //make sure we stay within the plot while selecting
  if (end_cairo[0] > start_cairo[0]) {
    //this 1E-10 subtraction is necessary to ensure calc_world works properly
    //when dragging a box that touches the right axis.
    end_cairo[0] = MIN(end_cairo[0], x_cr_range[1] - 1E-10);
  }
  else if (end_cairo[0] < start_cairo[0]) {
    end_cairo[0] = MAX(end_cairo[0], x_cr_range[0]);
  }

  if (end_cairo[1] > start_cairo[1]) {
    end_cairo[1] = MIN(end_cairo[1], y_cr_range[1]);
  }
  else if (end_cairo[1] < start_cairo[1]) {
    end_cairo[1] = MAX(end_cairo[1], y_cr_range[0]);
  }

  selecting = false;

  //emit signal!
  //prepare plplot coordinates
  //inspired by https://www.mail-archive.com/plplot-devel@lists.sourceforge.net/msg03079.html
  double start_cairo_norm[2] = {start_cairo[0]/width, start_cairo[1]/height};
  double end_cairo_norm[2] = {end_cairo[0]/width, end_cairo[1]/height};

  double start_plplot[2];
  double end_plplot[2];
  int index;

  //get the plot coordinates corresponding to the cairo coordinates
  pls->calc_world(start_cairo_norm[0], start_cairo_norm[1],
                  start_plplot[0], start_plplot[1], index);
  pls->calc_world(end_cairo_norm[0], end_cairo_norm[1],
                  end_plplot[0], end_plplot[1], index);

  double start_plplot_def[2];
  double end_plplot_def[2];

  //ensure that the coordinates are within the extremes based on the x and y vectors
  //in case of the full view, due to precision errors, the extremes calculated based on calc_world
  //are actually slightly outside of these data extremes, meaning that it's not possible to drag the selection
  //along the plot grid
  start_plplot_def[0] = MAX(MIN(start_plplot[0], end_plplot[0]), *(x.begin()));
  start_plplot_def[1] = MAX(MIN(start_plplot[1], end_plplot[1]), *std::min_element(y.begin(), y.end()));
  end_plplot_def[0] = MIN(MAX(start_plplot[0], end_plplot[0]), *(x.end()-1));
  end_plplot_def[1] = MIN(MAX(start_plplot[1], end_plplot[1]), *std::max_element(y.begin(), y.end()));

  this->get_window()->invalidate(true);

  _signal_select_region.emit(start_plplot_def[0], end_plplot_def[0], start_plplot_def[1], end_plplot_def[1]);

  return true;
}

bool PLplotDrawingArea::on_motion_notify_event (GdkEventMotion *event) {
  if (!selecting)
    return true;

  Gtk::Allocation allocation = get_allocation();
  const int width = allocation.get_width();
  const int height = allocation.get_height();

  end_event[0] = event->x;
  end_event[1] = event->y;
  end_cairo[0] = event->x;
  end_cairo[1] = height - 1.0 * event->y;

  //make sure we stay within the plot while selecting
  if (end_cairo[0] > start_cairo[0]) {
    end_cairo[0] = MIN(end_cairo[0], x_cr_range[1]);
  }
  else if (end_cairo[0] < start_cairo[0]) {
    end_cairo[0] = MAX(end_cairo[0], x_cr_range[0]);
  }

  if (end_cairo[1] > start_cairo[1]) {
    end_cairo[1] = MIN(end_cairo[1], y_cr_range[1]);
  }
  else if (end_cairo[1] < start_cairo[1]) {
    end_cairo[1] = MAX(end_cairo[1], y_cr_range[0]);
  }

  this->get_window()->invalidate(true);

  return true;
}

void PLplotDrawingArea::draw_plot(const Cairo::RefPtr<Cairo::Context> &cr, plstream *_pls, int width, int height) {
  _pls->sdev("extcairo");
  _pls->spage(0.0, 0.0, width, height, 0, 0);
  _pls->init();

  Gdk::RGBA color = get_style_context()->get_color();
  Gdk::Cairo::set_source_rgba(cr, color);
  _pls->cmd(PLESC_DEVINIT, cr->cobj());
  _pls->col0(0);

  _pls->env(x_pl_range[0], x_pl_range[1],
            y_pl_range[0], y_pl_range[1],
            0, 0);

  _pls->lab(x_title.c_str(), y_title.c_str(), plot_title.c_str());
  _pls->col0(1);
  _pls->line(x.size(), &x[0], &y[0]);

  return;
}

bool PLplotDrawingArea::on_draw(const Cairo::RefPtr<Cairo::Context>& cr) {
  Gtk::Allocation allocation = get_allocation();
  const int width = allocation.get_width();
  const int height = allocation.get_height();

  if (pls)
    delete pls;
  pls = new plstream;

  draw_plot(cr, pls, width, height);

  if (selecting &&
      start_cairo[0] >= 0.0 &&
      start_cairo[1] >= 0.0 &&
      end_cairo[0] >= 0.0 &&
      end_cairo[1] >= 0.0) {
    cr->set_line_width(2);
    cr->set_source_rgb(0, 0, 0);
    cr->rectangle(MIN(start_cairo[0], end_cairo[0]),
                  MIN(start_cairo[1], end_cairo[1]),
                  fabs(end_cairo[0] - start_cairo[0]),
                  fabs(end_cairo[1] - start_cairo[1]));
    cr->stroke();
  }

  convert_plplot_to_cairo_coordinates(x_pl_range[0], y_pl_range[0],
                                      x_cr_range[0], y_cr_range[0]);
  convert_plplot_to_cairo_coordinates(x_pl_range[1], y_pl_range[1],
                                      x_cr_range[1], y_cr_range[1]);
  return true;
}

void PLplotDrawingArea::convert_plplot_to_cairo_coordinates(
     double x_pl, double y_pl,
     double &x_cr, double &y_cr) {
  //inspired by http://www.mail-archive.com/plplot-devel@lists.sourceforge.net/msg02383.html
  //but the last equation was incorrect and is fixed here
  Gtk::Allocation allocation = get_allocation();
  const int width = allocation.get_width();
  const int height = allocation.get_height();
  double nxmin, nxmax, nymin, nymax;
  double wxmin, wxmax, wymin, wymax;

  pls->gvpd(nxmin, nxmax, nymin, nymax);
  pls->gvpw(wxmin, wxmax, wymin, wymax);

  double xmin = width * nxmin;
  double xmax = width * nxmax;
  double ymin = height * nymin;
  double ymax = height * nymax;

  x_cr = xmin + ((xmax - xmin) * ((x_pl - wxmin) / (wxmax - wxmin)));
  y_cr = ymin + ((ymax - ymin) * ((y_pl - wymin) / (wymax - wymin)));
}

PLplotDrawingArea.h

#ifndef PLPLOTDRAWINGAREA_H
#define PLPLOTDRAWINGAREA_H

#include <gtkmm/drawingarea.h>
#include <plstream.h>
#include <string>
#include <vector>

typedef sigc::signal<void, double, double, double, double > type_signal_select_region;

class PLplotDrawingArea : public Gtk::DrawingArea {
private:
  std::vector<PLFLT> x;
  std::vector<PLFLT> y;
  std::string x_title;
  std::string y_title;
  std::string plot_title;
  double start_event[2];
  double start_cairo[2];
  double end_event[2];
  double end_cairo[2];
  bool selecting;
  plstream *pls;
  double x_pl_range[2];
  double y_pl_range[2];
  double x_cr_range[2];
  double y_cr_range[2];
protected:
  //our handler for the on_draw signal
  virtual bool on_draw(const Cairo::RefPtr<Cairo::Context>& cr);
  // This is the default handler for the signal signal_select_region().
  virtual void on_select_region(double xmin, double xmax, double ymin, double ymax);
  bool on_button_press_event(GdkEventButton *event);
  bool on_button_release_event(GdkEventButton *event);
  bool on_motion_notify_event (GdkEventMotion *event);
  type_signal_select_region _signal_select_region;

public:
  PLplotDrawingArea(
    const std::vector<PLFLT> &x,
    const std::vector<PLFLT> &y,
    const std::string &x_title,
    const std::string &y_title,
    const std::string &plot_title
  );
  void convert_plplot_to_cairo_coordinates(
    double x_pl, double y_pl,
    double &x_cr, double &y_cr);
  virtual ~PLplotDrawingArea() {
    if (pls)
      delete pls;
  }

  type_signal_select_region signal_select_region() {
    return _signal_select_region;
  }

  void set_region(double xmin, double xmax, double ymin, double ymax);

  void draw_plot(const Cairo::RefPtr<Cairo::Context> &cr, plstream *_pls, int width, int height);
};
#endif

PLplotWindow.cpp

#include "PLplotWindow.h"
#include <gtkmm/printsettings.h>
#include <gtkmm/pagesetup.h>
#include <gtkmm/printoperation.h>
#include <gtkmm/filechooserdialog.h>

bool PLplotWindow::on_plplot_drawing_area_double_click(GdkEventButton *event,
  double xmin, double xmax, double ymin, double ymax) {
  if (event->type == GDK_2BUTTON_PRESS) {
    plplot_drawing_area.set_region(xmin, xmax, ymin, ymax);
  }
  return false;
}

PLplotWindow::PLplotWindow(std::vector<PLFLT> &x, std::vector<PLFLT> &y,
    std::string x_title, std::string y_title,
    std::string plot_title) : plplot_drawing_area(x, y, x_title,
      y_title, plot_title), print_button("Print"), saveas_button("Save as"),
      quit_button("Quit"), buttons(Gtk::ORIENTATION_HORIZONTAL) {

  set_default_size(720, 580);
  //sadly the fixed aspect ratio does not work properly on OS X
  //see https://bugzilla.gnome.org/show_bug.cgi?id=723859
  //I submitted a patch for this...
  Gdk::Geometry geometry;
  geometry.min_aspect = geometry.max_aspect = double(720)/double(580);
  set_geometry_hints(*this, geometry, Gdk::HINT_ASPECT);
  set_title("PLplot Gtkmm DrawingArea example");
  //resize on select
  //signal_select_region's default handler doesnt do anything so
  //in order for the selection box to do something at all, two options are available:
  //1) derive PLplotDrawingArea and define your own on_select_region method
  //2) if using an instance of PLplotDrawingArea, connect a signal to signal_select_region, this is done here
  //both options are encouraged to use PLplotDrawingArea::set_region, possibly combined with further calls...
  plplot_drawing_area.signal_select_region().connect(sigc::mem_fun(plplot_drawing_area, &PLplotDrawingArea::set_region));

  //the double click event is not handled at all by PLplotDrawingArea (although I could...)
  plplot_drawing_area.signal_button_press_event().connect(sigc::bind(sigc::mem_fun(*this, &PLplotWindow::on_plplot_drawing_area_double_click), *(x.begin()), *(x.end()-1), *std::min_element(y.begin(), y.end()), *std::max_element(y.begin(), y.end())));

  quit_button.signal_clicked().connect(sigc::mem_fun(*this, &PLplotWindow::on_quit_button_clicked));
  print_button.signal_clicked().connect(sigc::mem_fun(*this, &PLplotWindow::on_print_button_clicked));
  saveas_button.signal_clicked().connect(sigc::mem_fun(*this, &PLplotWindow::on_saveas_button_clicked));

  buttons.pack_start(print_button);
  buttons.pack_start(saveas_button);
  buttons.pack_start(quit_button);
  buttons.set_layout(Gtk::BUTTONBOX_CENTER);
  buttons.set_spacing(10);
  buttons.set_vexpand(false);
  buttons.set_hexpand(true);

  plplot_drawing_area.set_hexpand(true);
  plplot_drawing_area.set_vexpand(true);

  grid.attach(buttons, 0, 0, 1, 1);
  grid.attach(plplot_drawing_area, 0, 1, 1, 1);
  grid.set_column_spacing(5);
	grid.set_row_spacing(5);
	grid.set_row_homogeneous(false);
	grid.set_column_homogeneous(false);

  add(grid);
  set_border_width(10);
  grid.show_all();
  //plplot_drawing_area.show();

}


void PLplotWindow::on_draw_page(const Glib::RefPtr<Gtk::PrintContext>& context, int page_nr) {
  ::Cairo::RefPtr< ::Cairo::Context> cr = context->get_cairo_context();

  plstream pls;
  plplot_drawing_area.draw_plot(cr, &pls, 842, 595);
}

void PLplotWindow::on_print_button_clicked() {
  //print settings
  Glib::RefPtr<Gtk::PrintSettings> print_settings = Gtk::PrintSettings::create();
  print_settings->set_orientation(Gtk::PAGE_ORIENTATION_LANDSCAPE);
  print_settings->set_paper_size(Gtk::PaperSize(Gtk::PAPER_NAME_A4));

  Glib::RefPtr<Gtk::PageSetup> page_setup = Gtk::PageSetup::create();
  page_setup->set_orientation(Gtk::PAGE_ORIENTATION_LANDSCAPE);
  page_setup->set_paper_size_and_default_margins(Gtk::PaperSize(Gtk::PAPER_NAME_A4));

  Glib::RefPtr<Gtk::PrintOperation> operation = Gtk::PrintOperation::create();
  operation->set_print_settings(print_settings);
  operation->set_default_page_setup(page_setup);
  operation->set_show_progress(true);
  operation->set_track_print_status(true);
  operation->set_use_full_page(true);
  operation->signal_draw_page().connect(sigc::mem_fun(*this, &PLplotWindow::on_draw_page));
  operation->set_n_pages(1);

  if (Gtk::PRINT_OPERATION_RESULT_APPLY != operation->run(Gtk::PRINT_OPERATION_ACTION_PRINT_DIALOG, *this)) {
    //error handling
  }

  return;
}

void PLplotWindow::on_saveas_button_clicked() {
  Gtk::FileChooserDialog dialog(*this, "Save as", Gtk::FILE_CHOOSER_ACTION_SAVE);
  dialog.add_button("_Cancel", Gtk::RESPONSE_CANCEL);
	dialog.add_button("Select", Gtk::RESPONSE_OK);
  dialog.set_do_overwrite_confirmation(true);
  Glib::RefPtr<Gtk::FileFilter> filter_eps = Gtk::FileFilter::create();
  filter_eps->add_pattern("*.eps");
  filter_eps->set_name("EPS");
  dialog.add_filter(filter_eps);
  Glib::RefPtr<Gtk::FileFilter> filter_png = Gtk::FileFilter::create();
  filter_png->add_pattern("*.png");
  filter_png->set_name("PNG");
  dialog.add_filter(filter_png);
  Glib::RefPtr<Gtk::FileFilter> filter_pdf = Gtk::FileFilter::create();
  filter_pdf->add_pattern("*.pdf");
  filter_pdf->set_name("PDF");
  dialog.add_filter(filter_pdf);

  if (dialog.run() == Gtk::RESPONSE_OK) {
    std::string filename = dialog.get_filename();
    Glib::RefPtr<Gtk::FileFilter> filter_selected = dialog.get_filter();
    if (filter_selected->get_name() == "EPS") {
      if (filename.compare(filename.length()-4, std::string::npos, ".eps") != 0)
				filename += ".eps";

      Cairo::RefPtr<Cairo::PsSurface> surface = Cairo::PsSurface::create(filename, 842, 595);
      surface->set_eps(true);
      Cairo::RefPtr<Cairo::Context> cr = Cairo::Context::create(surface);

      plstream pls;
      plplot_drawing_area.draw_plot(cr, &pls, 842, 595);

      cr->show_page();
    }
    else if (filter_selected->get_name() == "PNG") {
      if (filename.compare(filename.length()-4, std::string::npos, ".png") != 0)
				filename += ".png";

      Cairo::RefPtr<Cairo::ImageSurface> surface = Cairo::ImageSurface::create(Cairo::FORMAT_ARGB32, 842, 595);
      Cairo::RefPtr<Cairo::Context> cr = Cairo::Context::create(surface);

      plstream pls;
      plplot_drawing_area.draw_plot(cr, &pls, 842, 595);

      surface->write_to_png(filename);
    }
    else if (filter_selected->get_name() == "PDF") {
      if (filename.compare(filename.length()-4, std::string::npos, ".pdf") != 0)
				filename += ".pdf";

      Cairo::RefPtr<Cairo::PdfSurface> surface = Cairo::PdfSurface::create(filename, 842, 595);
      Cairo::RefPtr<Cairo::Context> cr = Cairo::Context::create(surface);

      plstream pls;
      plplot_drawing_area.draw_plot(cr, &pls, 842, 595);

      cr->show_page();
    }
  }
  return;
}

PLplotWindow.h

#ifndef PLPLOTWINDOW_H
#define PLPLOTWINDOW_H

#include <gtkmm/window.h>
#include <gtkmm/grid.h>
#include <gtkmm/buttonbox.h>
#include <gtkmm/button.h>
#include "PLplotDrawingArea.h"
#include <plstream.h>
#include <vector>
#include <string>
#include <cmath>
#include <iostream>
#include <gtkmm/printcontext.h>


class PLplotWindow : public Gtk::Window {
private:
  PLplotDrawingArea plplot_drawing_area;
  bool on_plplot_drawing_area_double_click(GdkEventButton *event,
    double xmin, double xmax, double ymin, double ymax);
  Gtk::Grid grid;
  Gtk::Button print_button;
  Gtk::Button saveas_button;
  Gtk::Button quit_button;
  Gtk::ButtonBox buttons;
  void on_quit_button_clicked() {
    get_application()->remove_window(*this);
    return;
  }
  void on_saveas_button_clicked();
  void on_print_button_clicked();
  void on_draw_page(const Glib::RefPtr<Gtk::PrintContext>& context, int page_nr);

public:
  PLplotWindow(std::vector<PLFLT> &x, std::vector<PLFLT> &y,
    std::string x_title = "X-axis", std::string y_title = "Y-axis",
    std::string plot_title = "");
  virtual ~PLplotWindow() {}


};



#endif