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Diffstat (limited to 'app/display/gimpdisplayshell-rulers.c')
| -rw-r--r-- | app/display/gimpdisplayshell-rulers.c | 181 |
1 files changed, 181 insertions, 0 deletions
diff --git a/app/display/gimpdisplayshell-rulers.c b/app/display/gimpdisplayshell-rulers.c new file mode 100644 index 0000000..79253c8 --- /dev/null +++ b/app/display/gimpdisplayshell-rulers.c @@ -0,0 +1,181 @@ +/* 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); +} |