/* GTK - The GIMP Toolkit

 * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald

 *

 * This library is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; either

 * version 2 of the License, or (at your option) any later version.

 *

 * This library 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

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public

 * License along with this library; if not, write to the

 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,

 * Boston, MA 02111-1307, USA.

 */

/*

 * Modified by the GTK+ Team and others 1997-2000.  See the AUTHORS

 * file for a list of people on the GTK+ Team.  See the ChangeLog

 * files for a list of changes.  These files are distributed with

 * GTK+ at ftp://ftp.gtk.org/pub/gtk/.

 */

#include "config.h"

#include <math.h>

#include <string.h>

#undef GDK_DISABLE_DEPRECATED /* We need gdk_drawable_get_size() */

#undef GTK_DISABLE_DEPRECATED

#include "gtkorientable.h"

#include "gtkruler.h"

#include "gtkprivate.h"

#include "gtkintl.h"

#include "gtkalias.h"

#define RULER_WIDTH           14

#define MINIMUM_INCR          5

#define MAXIMUM_SUBDIVIDE     5

#define MAXIMUM_SCALES        10

#define ROUND(x) ((int) ((x) + 0.5))

enum {

  PROP_0,

  PROP_ORIENTATION,

  PROP_LOWER,

  PROP_UPPER,

  PROP_POSITION,

  PROP_MAX_SIZE,

  PROP_METRIC

};

typedef struct _GtkRulerPrivate GtkRulerPrivate;

struct _GtkRulerPrivate

{

  GtkOrientation orientation;

};

#define GTK_RULER_GET_PRIVATE(obj) (G_TYPE_INSTANCE_GET_PRIVATE ((obj), GTK_TYPE_RULER, GtkRulerPrivate))

static void     gtk_ruler_set_property    (GObject        *object,

                                           guint            prop_id,

                                           const GValue   *value,

                                           GParamSpec     *pspec);

static void     gtk_ruler_get_property    (GObject        *object,

                                           guint           prop_id,

                                           GValue         *value,

                                           GParamSpec     *pspec);

static void     gtk_ruler_realize         (GtkWidget      *widget);

static void     gtk_ruler_unrealize       (GtkWidget      *widget);

static void     gtk_ruler_size_request    (GtkWidget      *widget,

                                           GtkRequisition *requisition);

static void     gtk_ruler_size_allocate   (GtkWidget      *widget,

                                           GtkAllocation  *allocation);

static gboolean gtk_ruler_motion_notify   (GtkWidget      *widget,

                                           GdkEventMotion *event);

static gboolean gtk_ruler_expose          (GtkWidget      *widget,

                                           GdkEventExpose *event);

static void     gtk_ruler_make_pixmap     (GtkRuler       *ruler);

static void     gtk_ruler_real_draw_ticks (GtkRuler       *ruler);

static void     gtk_ruler_real_draw_pos   (GtkRuler       *ruler);

static const GtkRulerMetric ruler_metrics[] =

{

  { "Pixel", "Pi", 1.0, { 1, 2, 5, 10, 25, 50, 100, 250, 500, 1000 }, { 1, 5, 10, 50, 100 }},

  { "Inches", "In", 72.0, { 1, 2, 4, 8, 16, 32, 64, 128, 256, 512 }, { 1, 2, 4, 8, 16 }},

  { "Centimeters", "Cn", 28.35, { 1, 2, 5, 10, 25, 50, 100, 250, 500, 1000 }, { 1, 5, 10, 50, 100 }},

};

G_DEFINE_TYPE_WITH_CODE (GtkRuler, gtk_ruler, GTK_TYPE_WIDGET,

                         G_IMPLEMENT_INTERFACE (GTK_TYPE_ORIENTABLE,

                                                NULL))

static void

gtk_ruler_class_init (GtkRulerClass *class)

{

  GObjectClass   *gobject_class = G_OBJECT_CLASS (class);

  GtkWidgetClass *widget_class  = GTK_WIDGET_CLASS (class);

  gobject_class->set_property = gtk_ruler_set_property;

  gobject_class->get_property = gtk_ruler_get_property;

  widget_class->realize = gtk_ruler_realize;

  widget_class->unrealize = gtk_ruler_unrealize;

  widget_class->size_request = gtk_ruler_size_request;

  widget_class->size_allocate = gtk_ruler_size_allocate;

  widget_class->motion_notify_event = gtk_ruler_motion_notify;

  widget_class->expose_event = gtk_ruler_expose;

  class->draw_ticks = gtk_ruler_real_draw_ticks;

  class->draw_pos = gtk_ruler_real_draw_pos;

  g_object_class_override_property (gobject_class,

                                    PROP_ORIENTATION,

                                    "orientation");

  g_object_class_install_property (gobject_class,

                                   PROP_LOWER,

                                   g_param_spec_double ("lower",

							P_("Lower"),

							P_("Lower limit of ruler"),

							-G_MAXDOUBLE,

							G_MAXDOUBLE,

							0.0,

							GTK_PARAM_READWRITE));  

  g_object_class_install_property (gobject_class,

                                   PROP_UPPER,

                                   g_param_spec_double ("upper",

							P_("Upper"),

							P_("Upper limit of ruler"),

							-G_MAXDOUBLE,

							G_MAXDOUBLE,

							0.0,

							GTK_PARAM_READWRITE));  

  g_object_class_install_property (gobject_class,

                                   PROP_POSITION,

                                   g_param_spec_double ("position",

							P_("Position"),

							P_("Position of mark on the ruler"),

							-G_MAXDOUBLE,

							G_MAXDOUBLE,

							0.0,

							GTK_PARAM_READWRITE));  

  g_object_class_install_property (gobject_class,

                                   PROP_MAX_SIZE,

                                   g_param_spec_double ("max-size",

							P_("Max Size"),

							P_("Maximum size of the ruler"),

							-G_MAXDOUBLE,

							G_MAXDOUBLE,

							0.0,

							GTK_PARAM_READWRITE));  

  /**

   * GtkRuler:metric:

   *

   * The metric used for the ruler.

   *

   * Since: 2.8

   */

  g_object_class_install_property (gobject_class,

                                   PROP_METRIC,

                                   g_param_spec_enum ("metric",

						      P_("Metric"),

						      P_("The metric used for the ruler"),

						      GTK_TYPE_METRIC_TYPE, 

						      GTK_PIXELS,

						      GTK_PARAM_READWRITE));  

  g_type_class_add_private (gobject_class, sizeof (GtkRulerPrivate));

}

static void

gtk_ruler_init (GtkRuler *ruler)

{

  GtkWidget *widget = GTK_WIDGET (ruler);

  GtkRulerPrivate *private = GTK_RULER_GET_PRIVATE (ruler);

  private->orientation = GTK_ORIENTATION_HORIZONTAL;

  widget->requisition.width  = widget->style->xthickness * 2 + 1;

  widget->requisition.height = widget->style->ythickness * 2 + RULER_WIDTH;

  ruler->backing_store = NULL;

  ruler->xsrc = 0;

  ruler->ysrc = 0;

  ruler->slider_size = 0;

  ruler->lower = 0;

  ruler->upper = 0;

  ruler->position = 0;

  ruler->max_size = 0;

  gtk_ruler_set_metric (ruler, GTK_PIXELS);

}

static void

gtk_ruler_set_property (GObject      *object,

 			guint         prop_id,

			const GValue *value,

			GParamSpec   *pspec)

{

  GtkRuler *ruler = GTK_RULER (object);

  GtkRulerPrivate *private = GTK_RULER_GET_PRIVATE (ruler);

  switch (prop_id)

    {

    case PROP_ORIENTATION:

      private->orientation = g_value_get_enum (value);

      gtk_widget_queue_resize (GTK_WIDGET (ruler));

      break;

    case PROP_LOWER:

      gtk_ruler_set_range (ruler, g_value_get_double (value), ruler->upper,

			   ruler->position, ruler->max_size);

      break;

    case PROP_UPPER:

      gtk_ruler_set_range (ruler, ruler->lower, g_value_get_double (value),

			   ruler->position, ruler->max_size);

      break;

    case PROP_POSITION:

      gtk_ruler_set_range (ruler, ruler->lower, ruler->upper,

			   g_value_get_double (value), ruler->max_size);

      break;

    case PROP_MAX_SIZE:

      gtk_ruler_set_range (ruler, ruler->lower, ruler->upper,

			   ruler->position,  g_value_get_double (value));

      break;

    case PROP_METRIC:

      gtk_ruler_set_metric (ruler, g_value_get_enum (value));

      break;

    default:

      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);

      break;

    }

}

static void

gtk_ruler_get_property (GObject      *object,

			guint         prop_id,

			GValue       *value,

			GParamSpec   *pspec)

{

  GtkRuler *ruler = GTK_RULER (object);

  GtkRulerPrivate *private = GTK_RULER_GET_PRIVATE (ruler);

  switch (prop_id)

    {

    case PROP_ORIENTATION:

      g_value_set_enum (value, private->orientation);

      break;

    case PROP_LOWER:

      g_value_set_double (value, ruler->lower);

      break;

    case PROP_UPPER:

      g_value_set_double (value, ruler->upper);

      break;

    case PROP_POSITION:

      g_value_set_double (value, ruler->position);

      break;

    case PROP_MAX_SIZE:

      g_value_set_double (value, ruler->max_size);

      break;

    case PROP_METRIC:

      g_value_set_enum (value, gtk_ruler_get_metric (ruler));

      break;

    default:

      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);

      break;

    }

}

void

gtk_ruler_set_metric (GtkRuler      *ruler,

		      GtkMetricType  metric)

{

  g_return_if_fail (GTK_IS_RULER (ruler));

  ruler->metric = (GtkRulerMetric *) &ruler_metrics[metric];

  if (gtk_widget_is_drawable (GTK_WIDGET (ruler)))

    gtk_widget_queue_draw (GTK_WIDGET (ruler));

  g_object_notify (G_OBJECT (ruler), "metric");

}

/**

 * gtk_ruler_get_metric:

 * @ruler: a #GtkRuler

 *

 * Gets the units used for a #GtkRuler. See gtk_ruler_set_metric().

 *

 * Return value: the units currently used for @ruler

 *

 * @Deprecated: 2.24: #GtkRuler has been removed from GTK 3 for being

 *              unmaintained and too specialized. There is no replacement.

 **/

GtkMetricType

gtk_ruler_get_metric (GtkRuler *ruler)

{

  gint i;

  g_return_val_if_fail (GTK_IS_RULER (ruler), 0);

  for (i = 0; i < G_N_ELEMENTS (ruler_metrics); i++)

    if (ruler->metric == &ruler_metrics[i])

      return i;

  g_assert_not_reached ();

  return 0;

}

/**

 * gtk_ruler_set_range:

 * @ruler: the gtkruler

 * @lower: the lower limit of the ruler

 * @upper: the upper limit of the ruler

 * @position: the mark on the ruler

 * @max_size: the maximum size of the ruler used when calculating the space to

 * leave for the text

 *

 * This sets the range of the ruler. 

 *

 * @Deprecated: 2.24: #GtkRuler has been removed from GTK 3 for being

 *              unmaintained and too specialized. There is no replacement.

 */

void

gtk_ruler_set_range (GtkRuler *ruler,

		     gdouble   lower,

		     gdouble   upper,

		     gdouble   position,

		     gdouble   max_size)

{

  g_return_if_fail (GTK_IS_RULER (ruler));

  g_object_freeze_notify (G_OBJECT (ruler));

  if (ruler->lower != lower)

    {

      ruler->lower = lower;

      g_object_notify (G_OBJECT (ruler), "lower");

    }

  if (ruler->upper != upper)

    {

      ruler->upper = upper;

      g_object_notify (G_OBJECT (ruler), "upper");

    }

  if (ruler->position != position)

    {

      ruler->position = position;

      g_object_notify (G_OBJECT (ruler), "position");

    }

  if (ruler->max_size != max_size)

    {

      ruler->max_size = max_size;

      g_object_notify (G_OBJECT (ruler), "max-size");

    }

  g_object_thaw_notify (G_OBJECT (ruler));

  if (gtk_widget_is_drawable (GTK_WIDGET (ruler)))

    gtk_widget_queue_draw (GTK_WIDGET (ruler));

}

/**

 * gtk_ruler_get_range:

 * @ruler: a #GtkRuler

 * @lower: (allow-none): location to store lower limit of the ruler, or %NULL

 * @upper: (allow-none): location to store upper limit of the ruler, or %NULL

 * @position: (allow-none): location to store the current position of the mark on the ruler, or %NULL

 * @max_size: location to store the maximum size of the ruler used when calculating

 *            the space to leave for the text, or %NULL.

 *

 * Retrieves values indicating the range and current position of a #GtkRuler.

 * See gtk_ruler_set_range().

 *

 * @Deprecated: 2.24: #GtkRuler has been removed from GTK 3 for being

 *              unmaintained and too specialized. There is no replacement.

 **/

void

gtk_ruler_get_range (GtkRuler *ruler,

		     gdouble  *lower,

		     gdouble  *upper,

		     gdouble  *position,

		     gdouble  *max_size)

{

  g_return_if_fail (GTK_IS_RULER (ruler));

  if (lower)

    *lower = ruler->lower;

  if (upper)

    *upper = ruler->upper;

  if (position)

    *position = ruler->position;

  if (max_size)

    *max_size = ruler->max_size;

}

void

gtk_ruler_draw_ticks (GtkRuler *ruler)

{

  g_return_if_fail (GTK_IS_RULER (ruler));

  if (GTK_RULER_GET_CLASS (ruler)->draw_ticks)

    GTK_RULER_GET_CLASS (ruler)->draw_ticks (ruler);

}

void

gtk_ruler_draw_pos (GtkRuler *ruler)

{

  g_return_if_fail (GTK_IS_RULER (ruler));

  if (GTK_RULER_GET_CLASS (ruler)->draw_pos)

     GTK_RULER_GET_CLASS (ruler)->draw_pos (ruler);

}

static void

gtk_ruler_realize (GtkWidget *widget)

{

  GtkRuler *ruler;

  GdkWindowAttr attributes;

  gint attributes_mask;

  ruler = GTK_RULER (widget);

  gtk_widget_set_realized (widget, TRUE);

  attributes.window_type = GDK_WINDOW_CHILD;

  attributes.x = widget->allocation.x;

  attributes.y = widget->allocation.y;

  attributes.width = widget->allocation.width;

  attributes.height = widget->allocation.height;

  attributes.wclass = GDK_INPUT_OUTPUT;

  attributes.visual = gtk_widget_get_visual (widget);

  attributes.colormap = gtk_widget_get_colormap (widget);

  attributes.event_mask = gtk_widget_get_events (widget);

  attributes.event_mask |= (GDK_EXPOSURE_MASK |

			    GDK_POINTER_MOTION_MASK |

			    GDK_POINTER_MOTION_HINT_MASK);

  attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;

  widget->window = gdk_window_new (gtk_widget_get_parent_window (widget), &attributes, attributes_mask);

  gdk_window_set_user_data (widget->window, ruler);

  widget->style = gtk_style_attach (widget->style, widget->window);

  gtk_style_set_background (widget->style, widget->window, GTK_STATE_ACTIVE);

  gtk_ruler_make_pixmap (ruler);

}

static void

gtk_ruler_unrealize (GtkWidget *widget)

{

  GtkRuler *ruler = GTK_RULER (widget);

  if (ruler->backing_store)

    {

      g_object_unref (ruler->backing_store);

      ruler->backing_store = NULL;

    }

  GTK_WIDGET_CLASS (gtk_ruler_parent_class)->unrealize (widget);

}

static void

gtk_ruler_size_request (GtkWidget      *widget,

                        GtkRequisition *requisition)

{

  GtkRulerPrivate *private = GTK_RULER_GET_PRIVATE (widget);

  if (private->orientation == GTK_ORIENTATION_HORIZONTAL)

    {

      requisition->width  = widget->style->xthickness * 2 + 1;

      requisition->height = widget->style->ythickness * 2 + RULER_WIDTH;

    }

  else

    {

      requisition->width  = widget->style->xthickness * 2 + RULER_WIDTH;

      requisition->height = widget->style->ythickness * 2 + 1;

    }

}

static void

gtk_ruler_size_allocate (GtkWidget     *widget,

			 GtkAllocation *allocation)

{

  GtkRuler *ruler = GTK_RULER (widget);

  widget->allocation = *allocation;

  if (gtk_widget_get_realized (widget))

    {

      gdk_window_move_resize (widget->window,

			      allocation->x, allocation->y,

			      allocation->width, allocation->height);

      gtk_ruler_make_pixmap (ruler);

    }

}

static gboolean

gtk_ruler_motion_notify (GtkWidget      *widget,

                         GdkEventMotion *event)

{

  GtkRuler *ruler = GTK_RULER (widget);

  GtkRulerPrivate *private = GTK_RULER_GET_PRIVATE (widget);

  gint x;

  gint y;

  gdk_event_request_motions (event);

  x = event->x;

  y = event->y;

  if (private->orientation == GTK_ORIENTATION_HORIZONTAL)

    ruler->position = ruler->lower + ((ruler->upper - ruler->lower) * x) / widget->allocation.width;

  else

    ruler->position = ruler->lower + ((ruler->upper - ruler->lower) * y) / widget->allocation.height;

  g_object_notify (G_OBJECT (ruler), "position");

  /*  Make sure the ruler has been allocated already  */

  if (ruler->backing_store != NULL)

    gtk_ruler_draw_pos (ruler);

  return FALSE;

}

static gboolean

gtk_ruler_expose (GtkWidget      *widget,

		  GdkEventExpose *event)

{

  if (gtk_widget_is_drawable (widget))

    {

      GtkRuler *ruler = GTK_RULER (widget);

      cairo_t *cr;

      gtk_ruler_draw_ticks (ruler);

      cr = gdk_cairo_create (widget->window);

      gdk_cairo_set_source_pixmap (cr, ruler->backing_store, 0, 0);

      gdk_cairo_rectangle (cr, &event->area);

      cairo_fill (cr);

      cairo_destroy (cr);

      gtk_ruler_draw_pos (ruler);

    }

  return FALSE;

}

static void

gtk_ruler_make_pixmap (GtkRuler *ruler)

{

  GtkWidget *widget;

  gint width;

  gint height;

  widget = GTK_WIDGET (ruler);

  if (ruler->backing_store)

    {

      gdk_drawable_get_size (ruler->backing_store, &width, &height);

      if ((width == widget->allocation.width) &&

	  (height == widget->allocation.height))

	return;

      g_object_unref (ruler->backing_store);

    }

  ruler->backing_store = gdk_pixmap_new (widget->window,

					 widget->allocation.width,

					 widget->allocation.height,

					 -1);

  ruler->xsrc = 0;

  ruler->ysrc = 0;

}

static void

gtk_ruler_real_draw_ticks (GtkRuler *ruler)

{

  GtkWidget *widget = GTK_WIDGET (ruler);

  GtkRulerPrivate *private = GTK_RULER_GET_PRIVATE (ruler);

  cairo_t *cr;

  gint i, j;

  gint width, height;

  gint xthickness;

  gint ythickness;

  gint length, ideal_length;

  gdouble lower, upper;		/* Upper and lower limits, in ruler units */

  gdouble increment;		/* Number of pixels per unit */

  gint scale;			/* Number of units per major unit */

  gdouble subd_incr;

  gdouble start, end, cur;

  gchar unit_str[32];

  gint digit_height;

  gint digit_offset;

  gint text_width;

  gint text_height;

  gint pos;

  PangoLayout *layout;

  PangoRectangle logical_rect, ink_rect;

  if (!gtk_widget_is_drawable (widget))

    return;

  xthickness = widget->style->xthickness;

  ythickness = widget->style->ythickness;

  layout = gtk_widget_create_pango_layout (widget, "012456789");

  pango_layout_get_extents (layout, &ink_rect, &logical_rect);

  digit_height = PANGO_PIXELS (ink_rect.height) + 2;

  digit_offset = ink_rect.y;

  if (private->orientation == GTK_ORIENTATION_HORIZONTAL)

    {

      width = widget->allocation.width;

      height = widget->allocation.height - ythickness * 2;

    }

  else

    {

      width = widget->allocation.height;

      height = widget->allocation.width - ythickness * 2;

    }

#define DETAILE(private) (private->orientation == GTK_ORIENTATION_HORIZONTAL ? "hruler" : "vruler");

  gtk_paint_box (widget->style, ruler->backing_store,

		 GTK_STATE_NORMAL, GTK_SHADOW_OUT,

		 NULL, widget,

                 private->orientation == GTK_ORIENTATION_HORIZONTAL ?

                 "hruler" : "vruler",

		 0, 0,

		 widget->allocation.width, widget->allocation.height);

  cr = gdk_cairo_create (ruler->backing_store);

  gdk_cairo_set_source_color (cr, &widget->style->fg[widget->state]);

  if (private->orientation == GTK_ORIENTATION_HORIZONTAL)

    {

      cairo_rectangle (cr,

                       xthickness,

                       height + ythickness,

                       widget->allocation.width - 2 * xthickness,

                       1);

    }

  else

    {

      cairo_rectangle (cr,

                       height + xthickness,

                       ythickness,

                       1,

                       widget->allocation.height - 2 * ythickness);

    }

  upper = ruler->upper / ruler->metric->pixels_per_unit;

  lower = ruler->lower / ruler->metric->pixels_per_unit;

  if ((upper - lower) == 0)

    goto out;

  increment = (gdouble) width / (upper - lower);

  /* determine the scale H

   *  We calculate the text size as for the vruler instead of using

   *  text_width = gdk_string_width(font, unit_str), so that the result

   *  for the scale looks consistent with an accompanying vruler

   */

  /* determine the scale V

   *   use the maximum extents of the ruler to determine the largest

   *   possible number to be displayed.  Calculate the height in pixels

   *   of this displayed text. Use this height to find a scale which

   *   leaves sufficient room for drawing the ruler.

   */

  scale = ceil (ruler->max_size / ruler->metric->pixels_per_unit);

  g_snprintf (unit_str, sizeof (unit_str), "%d", scale);

  if (private->orientation == GTK_ORIENTATION_HORIZONTAL)

    {

      text_width = strlen (unit_str) * digit_height + 1;

      for (scale = 0; scale < MAXIMUM_SCALES; scale++)

        if (ruler->metric->ruler_scale[scale] * fabs(increment) > 2 * text_width)

          break;

    }

  else

    {

      text_height = strlen (unit_str) * digit_height + 1;

      for (scale = 0; scale < MAXIMUM_SCALES; scale++)

        if (ruler->metric->ruler_scale[scale] * fabs(increment) > 2 * text_height)

          break;

    }

  if (scale == MAXIMUM_SCALES)

    scale = MAXIMUM_SCALES - 1;

  /* drawing starts here */

  length = 0;

  for (i = MAXIMUM_SUBDIVIDE - 1; i >= 0; i--)

    {

      subd_incr = (gdouble) ruler->metric->ruler_scale[scale] /

	          (gdouble) ruler->metric->subdivide[i];

      if (subd_incr * fabs(increment) <= MINIMUM_INCR)

	continue;

      /* Calculate the length of the tickmarks. Make sure that

       * this length increases for each set of ticks

       */

      ideal_length = height / (i + 1) - 1;

      if (ideal_length > ++length)

	length = ideal_length;

      if (lower < upper)

	{

	  start = floor (lower / subd_incr) * subd_incr;

	  end   = ceil  (upper / subd_incr) * subd_incr;

	}

      else

	{

	  start = floor (upper / subd_incr) * subd_incr;

	  end   = ceil  (lower / subd_incr) * subd_incr;

	}

      for (cur = start; cur <= end; cur += subd_incr)

	{

	  pos = ROUND ((cur - lower) * increment);

          if (private->orientation == GTK_ORIENTATION_HORIZONTAL)

            {

              cairo_rectangle (cr,

                               pos, height + ythickness - length,

                               1,   length);

            }

          else

            {

              cairo_rectangle (cr,

                               height + xthickness - length, pos,

                               length,                       1);

            }

	  /* draw label */

	  if (i == 0)

	    {

	      g_snprintf (unit_str, sizeof (unit_str), "%d", (int) cur);

              if (private->orientation == GTK_ORIENTATION_HORIZONTAL)

                {

                  pango_layout_set_text (layout, unit_str, -1);

                  pango_layout_get_extents (layout, &logical_rect, NULL);

                  gtk_paint_layout (widget->style,

                                    ruler->backing_store,

                                    gtk_widget_get_state (widget),

                                    FALSE,

                                    NULL,

                                    widget,

                                    "hruler",

                                    pos + 2, ythickness + PANGO_PIXELS (logical_rect.y - digit_offset),

                                    layout);

                }

              else

                {

                  for (j = 0; j < (int) strlen (unit_str); j++)

                    {

                      pango_layout_set_text (layout, unit_str + j, 1);

                      pango_layout_get_extents (layout, NULL, &logical_rect);

                      gtk_paint_layout (widget->style,

                                        ruler->backing_store,

                                        gtk_widget_get_state (widget),

                                        FALSE,

                                        NULL,

                                        widget,

                                        "vruler",

                                        xthickness + 1,

                                        pos + digit_height * j + 2 + PANGO_PIXELS (logical_rect.y - digit_offset),

                                        layout);

                    }

                }

	    }

	}

    }

  cairo_fill (cr);

out:

  cairo_destroy (cr);

  g_object_unref (layout);

}

static void

gtk_ruler_real_draw_pos (GtkRuler *ruler)

{

  GtkWidget *widget = GTK_WIDGET (ruler);

  GtkRulerPrivate *private = GTK_RULER_GET_PRIVATE (ruler);

  gint x, y;

  gint width, height;

  gint bs_width, bs_height;

  gint xthickness;

  gint ythickness;

  gdouble increment;

  if (gtk_widget_is_drawable (widget))

    {

      xthickness = widget->style->xthickness;

      ythickness = widget->style->ythickness;

      width = widget->allocation.width;

      height = widget->allocation.height;

      if (private->orientation == GTK_ORIENTATION_HORIZONTAL)

        {

          height -= ythickness * 2;

          bs_width = height / 2 + 2;

          bs_width |= 1;  /* make sure it's odd */

          bs_height = bs_width / 2 + 1;

        }

      else

        {

          width -= xthickness * 2;

          bs_height = width / 2 + 2;

          bs_height |= 1;  /* make sure it's odd */

          bs_width = bs_height / 2 + 1;

        }

      if ((bs_width > 0) && (bs_height > 0))

	{

	  cairo_t *cr = gdk_cairo_create (widget->window);

	  /*  If a backing store exists, restore the ruler  */

	  if (ruler->backing_store)

            {

              cairo_t *cr = gdk_cairo_create (widget->window);

              gdk_cairo_set_source_pixmap (cr, ruler->backing_store, 0, 0);

              cairo_rectangle (cr, ruler->xsrc, ruler->ysrc, bs_width, bs_height);

              cairo_fill (cr);

              cairo_destroy (cr);

            }

          if (private->orientation == GTK_ORIENTATION_HORIZONTAL)

            {

              increment = (gdouble) width / (ruler->upper - ruler->lower);

              x = ROUND ((ruler->position - ruler->lower) * increment) + (xthickness - bs_width) / 2 - 1;

              y = (height + bs_height) / 2 + ythickness;

            }

          else

            {

              increment = (gdouble) height / (ruler->upper - ruler->lower);

              x = (width + bs_width) / 2 + xthickness;

              y = ROUND ((ruler->position - ruler->lower) * increment) + (ythickness - bs_height) / 2 - 1;

            }

	  gdk_cairo_set_source_color (cr, &widget->style->fg[widget->state]);

	  cairo_move_to (cr, x, y);

          if (private->orientation == GTK_ORIENTATION_HORIZONTAL)

            {

              cairo_line_to (cr, x + bs_width / 2.0, y + bs_height);

              cairo_line_to (cr, x + bs_width,       y);

            }