1 files changed, 277 insertions, 0 deletions

diff --git a/gtk/gtkhruler.c b/gtk/gtkhruler.c
new file mode 100644
index 000000000..ab6e69199
--- /dev/null
+++ b/gtk/gtkhruler.c
@@ -0,0 +1,277 @@
+/* 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 Library 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
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the Free
+ * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+#include <math.h>
+#include <stdio.h>
+#include <string.h>
+#include "gtkhruler.h"
+
+
+#define RULER_HEIGHT          14
+#define MINIMUM_INCR          5
+#define MAXIMUM_SUBDIVIDE     5
+#define MAXIMUM_SCALES        10
+
+#define ROUND(x) ((int) ((x) + 0.5))
+
+
+static void gtk_hruler_class_init    (GtkHRulerClass *klass);
+static void gtk_hruler_init          (GtkHRuler      *hruler);
+static gint gtk_hruler_motion_notify (GtkWidget      *widget,
+				      GdkEventMotion *event);
+static void gtk_hruler_draw_ticks    (GtkRuler       *ruler);
+static void gtk_hruler_draw_pos      (GtkRuler       *ruler);
+
+
+guint
+gtk_hruler_get_type ()
+{
+  static guint hruler_type = 0;
+
+  if (!hruler_type)
+    {
+      GtkTypeInfo hruler_info =
+      {
+	"GtkHRuler",
+	sizeof (GtkHRuler),
+	sizeof (GtkHRulerClass),
+	(GtkClassInitFunc) gtk_hruler_class_init,
+	(GtkObjectInitFunc) gtk_hruler_init,
+	(GtkArgFunc) NULL,
+      };
+
+      hruler_type = gtk_type_unique (gtk_ruler_get_type (), &hruler_info);
+    }
+
+  return hruler_type;
+}
+
+static void
+gtk_hruler_class_init (GtkHRulerClass *klass)
+{
+  GtkWidgetClass *widget_class;
+  GtkRulerClass *ruler_class;
+
+  widget_class = (GtkWidgetClass*) klass;
+  ruler_class = (GtkRulerClass*) klass;
+
+  widget_class->motion_notify_event = gtk_hruler_motion_notify;
+
+  ruler_class->draw_ticks = gtk_hruler_draw_ticks;
+  ruler_class->draw_pos = gtk_hruler_draw_pos;
+}
+
+static void
+gtk_hruler_init (GtkHRuler *hruler)
+{
+  GtkWidget *widget;
+
+  widget = GTK_WIDGET (hruler);
+  widget->requisition.width = widget->style->klass->xthickness * 2 + 1;
+  widget->requisition.height = widget->style->klass->ythickness * 2 + RULER_HEIGHT;
+}
+
+
+GtkWidget*
+gtk_hruler_new ()
+{
+  return GTK_WIDGET (gtk_type_new (gtk_hruler_get_type ()));
+}
+
+static gint
+gtk_hruler_motion_notify (GtkWidget      *widget,
+			  GdkEventMotion *event)
+{
+  GtkRuler *ruler;
+  gint x;
+
+  g_return_val_if_fail (widget != NULL, FALSE);
+  g_return_val_if_fail (GTK_IS_HRULER (widget), FALSE);
+  g_return_val_if_fail (event != NULL, FALSE);
+
+  ruler = GTK_RULER (widget);
+
+  if (event->is_hint)
+    gdk_window_get_pointer (widget->window, &x, NULL, NULL);
+  else
+    x = event->x;
+
+  ruler->position = ruler->lower + ((ruler->upper - ruler->lower) * x) / widget->allocation.width;
+
+  /*  Make sure the ruler has been allocated already  */
+  if (ruler->backing_store != NULL)
+    gtk_ruler_draw_pos (ruler);
+
+  return FALSE;
+}
+
+static void
+gtk_hruler_draw_ticks (GtkRuler *ruler)
+{
+  GtkWidget *widget;
+  GdkGC *gc;
+  gint i;
+  gint width, height;
+  gint xthickness;
+  gint ythickness;
+  gint length;
+  gfloat subd_incr;
+  gfloat step_incr;
+  gfloat increment;
+  gfloat start, end, cur;
+  gchar unit_str[12];
+  gint text_height;
+  gint digit_height;
+  gint pos;
+  gint scale;
+
+  g_return_if_fail (ruler != NULL);
+  g_return_if_fail (GTK_IS_HRULER (ruler));
+
+  if (GTK_WIDGET_DRAWABLE (ruler))
+    {
+      widget = GTK_WIDGET (ruler);
+
+      gc = widget->style->fg_gc[GTK_STATE_NORMAL];
+      xthickness = widget->style->klass->xthickness;
+      ythickness = widget->style->klass->ythickness;
+      digit_height = widget->style->font->ascent;
+
+      width = widget->allocation.width;
+      height = widget->allocation.height - ythickness * 2;
+      gdk_draw_line (ruler->backing_store, gc,
+		     xthickness,
+		     height + ythickness,
+		     widget->allocation.width - xthickness,
+		     height + ythickness);
+
+      if ((ruler->upper - ruler->lower) == 0)
+	return;
+
+      increment = (gfloat) width * ruler->metric->pixels_per_unit / (ruler->upper - ruler->lower);
+
+      /*  determine the scale
+       *   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 as for the vertical ruler case.  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);
+      sprintf (unit_str, "%d", scale);
+      text_height = strlen (unit_str) * digit_height + 1;
+
+      for (scale = 0; scale < MAXIMUM_SCALES; scale++)
+	if (ruler->metric->ruler_scale[scale] * increment > 2 * text_height)
+	  break;
+
+      if (scale == MAXIMUM_SCALES)
+	scale = MAXIMUM_SCALES - 1;
+
+      for (i = 0; i < MAXIMUM_SUBDIVIDE; i++)
+	{
+	  subd_incr = (gfloat) ruler->metric->ruler_scale[scale] / (gfloat) ruler->metric->subdivide[i];
+	  step_incr = subd_incr * increment;
+	  if (step_incr <= MINIMUM_INCR)
+	    break;
+
+	  start = floor ((ruler->lower / ruler->metric->pixels_per_unit) / subd_incr) * subd_incr;
+	  end = ceil ((ruler->upper / ruler->metric->pixels_per_unit) / subd_incr) * subd_incr;
+
+	  length = height / (i + 1) - 1;
+	  if (i > 0)
+	    length -= 2;
+
+	  cur = start;
+	  while (cur <= end)
+	    {
+	      pos = ROUND ((cur - (ruler->lower / ruler->metric->pixels_per_unit)) * increment);
+
+	      gdk_draw_line (ruler->backing_store, gc,
+			     pos, height + ythickness, pos,
+			     height - length + ythickness);
+	      if (i == 0)
+		{
+		  sprintf (unit_str, "%d", (int) cur);
+		  gdk_draw_string (ruler->backing_store, widget->style->font, gc,
+				   pos + 2,
+				   ythickness + digit_height - 1,
+				   unit_str);
+		}
+
+	      cur += subd_incr;
+	    }
+	}
+    }
+}
+
+static void
+gtk_hruler_draw_pos (GtkRuler *ruler)
+{
+  GtkWidget *widget;
+  GdkGC *gc;
+  int i;
+  gint x, y;
+  gint width, height;
+  gint bs_width, bs_height;
+  gint xthickness;
+  gint ythickness;
+  gfloat increment;
+
+  g_return_if_fail (ruler != NULL);
+  g_return_if_fail (GTK_IS_HRULER (ruler));
+
+  if (GTK_WIDGET_DRAWABLE (ruler))
+    {
+      widget = GTK_WIDGET (ruler);
+
+      gc = widget->style->fg_gc[GTK_STATE_NORMAL];
+      xthickness = widget->style->klass->xthickness;
+      ythickness = widget->style->klass->ythickness;
+      width = widget->allocation.width;
+      height = widget->allocation.height - ythickness * 2;
+
+      bs_width = height / 2;
+      bs_width |= 1;  /* make sure it's odd */
+      bs_height = bs_width / 2 + 1;
+
+      if ((bs_width > 0) && (bs_height > 0))
+	{
+	  /*  If a backing store exists, restore the ruler  */
+	  if (ruler->backing_store && ruler->non_gr_exp_gc)
+	    gdk_draw_pixmap (ruler->widget.window,
+			     ruler->non_gr_exp_gc,
+			     ruler->backing_store,
+			     ruler->xsrc, ruler->ysrc,
+			     ruler->xsrc, ruler->ysrc,
+			     bs_width, bs_height);
+
+	  increment = (gfloat) width / (ruler->upper - ruler->lower);
+
+	  x = ROUND ((ruler->position - ruler->lower) * increment) + (xthickness - bs_width) / 2 - 1;
+	  y = (height + bs_height) / 2 + ythickness;
+
+	  for (i = 0; i < bs_height; i++)
+	    gdk_draw_line (widget->window, gc,
+			   x + i, y + i,
+			   x + bs_width - 1 - i, y + i);
+
+
+	  ruler->xsrc = x;
+	  ruler->ysrc = y;
+	}
+    }
+}