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app: make rulers rotation aware

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Place the rulers' origin at the top-left corner of the canvas
(screen space) bounding box, and set their scale to the image-
space scale along the screen-space horizontal/vertical directions
(in other words, measuring a distance using the rulers should
give the same results as the measure tool; note that rotation
comes into play here only when the horizontal and vertical
image or screen resolutions are different, since otherwise the
scale is direction invariant.)

Make scrollbar step match ruler step under the new behavior.
This commit is contained in:
Ell
2016-07-19 15:47:59 +00:00
parent 720b73ca86
commit 5bdb20c839
4 changed files with 88 additions and 24 deletions
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62
app/display/gimpdisplayshell-rulers.c
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@ -17,10 +17,13 @@
#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"
@ -30,6 +33,7 @@
#include "gimpdisplay.h"
#include "gimpdisplayshell.h"
#include "gimpdisplayshell-rulers.h"
#include "gimpdisplayshell-scale.h"
/**
@ -43,6 +47,10 @@ 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;
@ -59,10 +67,37 @@ gimp_display_shell_rulers_update (GimpDisplayShell *shell)
if (image)
{
image_width = gimp_image_get_width (image);
image_height = gimp_image_get_height (image);
gint image_x, image_y;
gdouble res_x, res_y;
gdouble cos_a, sin_a;
gimp_image_get_resolution (image, &resolution_x, &resolution_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);
cos_a = cos (G_PI * shell->rotate_angle / 180.0);
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
{
@ -70,7 +105,6 @@ gimp_display_shell_rulers_update (GimpDisplayShell *shell)
image_height = shell->disp_height;
}
/* Initialize values */
horizontal_lower = 0;
@ -78,8 +112,7 @@ gimp_display_shell_rulers_update (GimpDisplayShell *shell)
if (image)
{
horizontal_upper = gimp_pixels_to_units (FUNSCALEX (shell,
shell->disp_width),
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,
@ -87,8 +120,7 @@ gimp_display_shell_rulers_update (GimpDisplayShell *shell)
shell->unit,
resolution_x);
vertical_upper = gimp_pixels_to_units (FUNSCALEY (shell,
shell->disp_height),
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,
@ -110,18 +142,8 @@ gimp_display_shell_rulers_update (GimpDisplayShell *shell)
if (image)
{
gdouble offset_x;
gdouble offset_y;
offset_x = gimp_pixels_to_units (FUNSCALEX (shell,
(gdouble) shell->offset_x),
shell->unit,
resolution_x);
offset_y = gimp_pixels_to_units (FUNSCALEX (shell,
(gdouble) shell->offset_y),
shell->unit,
resolution_y);
offset_x *= horizontal_upper / shell->disp_width;
offset_y *= vertical_upper / shell->disp_height;
horizontal_lower += offset_x;
horizontal_upper += offset_x;