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-rw-r--r--app/display/gimpdisplayshell-rulers.c181
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diff --git a/app/display/gimpdisplayshell-rulers.c b/app/display/gimpdisplayshell-rulers.c
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+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * This program 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.
+ *
+ * This program 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 this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <math.h>
+
+#include <gegl.h>
+#include <gtk/gtk.h>
+
+#include "libgimpbase/gimpbase.h"
+#include "libgimpmath/gimpmath.h"
+#include "libgimpwidgets/gimpwidgets.h"
+
+#include "display-types.h"
+
+#include "core/gimpimage.h"
+
+#include "gimpdisplay.h"
+#include "gimpdisplayshell.h"
+#include "gimpdisplayshell-rulers.h"
+#include "gimpdisplayshell-scale.h"
+
+
+/**
+ * gimp_display_shell_rulers_update:
+ * @shell:
+ *
+ **/
+void
+gimp_display_shell_rulers_update (GimpDisplayShell *shell)
+{
+ GimpImage *image;
+ gint image_width;
+ gint image_height;
+ gdouble offset_x = 0.0;
+ gdouble offset_y = 0.0;
+ gdouble scale_x = 1.0;
+ gdouble scale_y = 1.0;
+ gdouble resolution_x = 1.0;
+ gdouble resolution_y = 1.0;
+ gdouble horizontal_lower;
+ gdouble horizontal_upper;
+ gdouble horizontal_max_size;
+ gdouble vertical_lower;
+ gdouble vertical_upper;
+ gdouble vertical_max_size;
+
+ if (! shell->display)
+ return;
+
+ image = gimp_display_get_image (shell->display);
+
+ if (image)
+ {
+ gint image_x, image_y;
+ gdouble res_x, res_y;
+
+ gimp_display_shell_scale_get_image_bounds (shell,
+ &image_x, &image_y,
+ &image_width, &image_height);
+
+ gimp_display_shell_get_rotated_scale (shell, &scale_x, &scale_y);
+
+ image_width /= scale_x;
+ image_height /= scale_y;
+
+ offset_x = shell->offset_x - image_x;
+ offset_y = shell->offset_y - image_y;
+
+ gimp_image_get_resolution (image, &res_x, &res_y);
+
+ if (shell->rotate_angle == 0.0 || res_x == res_y)
+ {
+ resolution_x = res_x;
+ resolution_y = res_y;
+ }
+ else
+ {
+ gdouble cos_a = cos (G_PI * shell->rotate_angle / 180.0);
+ gdouble sin_a = sin (G_PI * shell->rotate_angle / 180.0);
+
+ if (shell->dot_for_dot)
+ {
+ resolution_x = 1.0 / sqrt (SQR (cos_a / res_x) +
+ SQR (sin_a / res_y));
+ resolution_y = 1.0 / sqrt (SQR (cos_a / res_y) +
+ SQR (sin_a / res_x));
+ }
+ else
+ {
+ resolution_x = sqrt (SQR (res_x * cos_a) + SQR (res_y * sin_a));
+ resolution_y = sqrt (SQR (res_y * cos_a) + SQR (res_x * sin_a));
+ }
+ }
+ }
+ else
+ {
+ image_width = shell->disp_width;
+ image_height = shell->disp_height;
+ }
+
+ /* Initialize values */
+
+ horizontal_lower = 0;
+ vertical_lower = 0;
+
+ if (image)
+ {
+ horizontal_upper = gimp_pixels_to_units (shell->disp_width / scale_x,
+ shell->unit,
+ resolution_x);
+ horizontal_max_size = gimp_pixels_to_units (MAX (image_width,
+ image_height),
+ shell->unit,
+ resolution_x);
+
+ vertical_upper = gimp_pixels_to_units (shell->disp_height / scale_y,
+ shell->unit,
+ resolution_y);
+ vertical_max_size = gimp_pixels_to_units (MAX (image_width,
+ image_height),
+ shell->unit,
+ resolution_y);
+ }
+ else
+ {
+ horizontal_upper = image_width;
+ horizontal_max_size = MAX (image_width, image_height);
+
+ vertical_upper = image_height;
+ vertical_max_size = MAX (image_width, image_height);
+ }
+
+
+ /* Adjust due to scrolling */
+
+ if (image)
+ {
+ offset_x *= horizontal_upper / shell->disp_width;
+ offset_y *= vertical_upper / shell->disp_height;
+
+ horizontal_lower += offset_x;
+ horizontal_upper += offset_x;
+
+ vertical_lower += offset_y;
+ vertical_upper += offset_y;
+ }
+
+ /* Finally setup the actual rulers */
+
+ gimp_ruler_set_range (GIMP_RULER (shell->hrule),
+ horizontal_lower,
+ horizontal_upper,
+ horizontal_max_size);
+
+ gimp_ruler_set_unit (GIMP_RULER (shell->hrule),
+ shell->unit);
+
+ gimp_ruler_set_range (GIMP_RULER (shell->vrule),
+ vertical_lower,
+ vertical_upper,
+ vertical_max_size);
+
+ gimp_ruler_set_unit (GIMP_RULER (shell->vrule),
+ shell->unit);
+}