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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 <gegl.h>
#include <gtk/gtk.h>
#include "libgimpbase/gimpbase.h"
#include "libgimpmath/gimpmath.h"
#include "display-types.h"
#include "core/gimp-utils.h"
#include "core/gimpimage.h"
#include "core/gimpunit.h"
#include "gimpdisplay.h"
#include "gimpdisplayshell.h"
#include "gimpdisplayshell-utils.h"
#include "gimp-intl.h"
void
gimp_display_shell_get_constrained_line_params (GimpDisplayShell *shell,
gdouble *offset_angle,
gdouble *xres,
gdouble *yres)
{
g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
g_return_if_fail (offset_angle != NULL);
g_return_if_fail (xres != NULL);
g_return_if_fail (yres != NULL);
if (shell->flip_horizontally ^ shell->flip_vertically)
*offset_angle = +shell->rotate_angle;
else
*offset_angle = -shell->rotate_angle;
*xres = 1.0;
*yres = 1.0;
if (! shell->dot_for_dot)
{
GimpImage *image = gimp_display_get_image (shell->display);
if (image)
gimp_image_get_resolution (image, xres, yres);
}
}
void
gimp_display_shell_constrain_line (GimpDisplayShell *shell,
gdouble start_x,
gdouble start_y,
gdouble *end_x,
gdouble *end_y,
gint n_snap_lines)
{
gdouble offset_angle;
gdouble xres, yres;
g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
g_return_if_fail (end_x != NULL);
g_return_if_fail (end_y != NULL);
gimp_display_shell_get_constrained_line_params (shell,
&offset_angle,
&xres, &yres);
gimp_constrain_line (start_x, start_y,
end_x, end_y,
n_snap_lines,
offset_angle,
xres, yres);
}
gdouble
gimp_display_shell_constrain_angle (GimpDisplayShell *shell,
gdouble angle,
gint n_snap_lines)
{
gdouble x, y;
g_return_val_if_fail (GIMP_IS_DISPLAY_SHELL (shell), 0.0);
x = cos (angle);
y = sin (angle);
gimp_display_shell_constrain_line (shell,
0.0, 0.0,
&x, &y,
n_snap_lines);
return atan2 (y, x);
}
/**
* gimp_display_shell_get_line_status:
* @status: initial status text.
* @separator: separator text between the line information and @status.
* @shell: #GimpDisplayShell this status text will be displayed for.
* @x1: abscissa of first point.
* @y1: ordinate of first point.
* @x2: abscissa of second point.
* @y2: ordinate of second point.
*
* Utility function to prepend the status message with a distance and
* angle value. Obviously this is only to be used for tools when it
* makes sense, and in particular when there is a concept of line. For
* instance when shift-clicking a painting tool or in the blend tool,
* etc.
* This utility prevents code duplication but also ensures a common
* display for every tool where such a status is needed. It will take
* into account the shell unit settings and will use the ideal digit
* precision according to current image resolution.
*
* Return value: a newly allocated string containing the enhanced status.
**/
gchar *
gimp_display_shell_get_line_status (GimpDisplayShell *shell,
const gchar *status,
const gchar *separator,
gdouble x1,
gdouble y1,
gdouble x2,
gdouble y2)
{
GimpImage *image;
gchar *enhanced_status;
gdouble xres;
gdouble yres;
gdouble dx, dy, pixel_dist;
gdouble angle;
image = gimp_display_get_image (shell->display);
if (! image)
{
/* This makes no sense to add line information when no image is
* attached to the display. */
return g_strdup (status);
}
if (shell->unit == GIMP_UNIT_PIXEL)
xres = yres = 1.0;
else
gimp_image_get_resolution (image, &xres, &yres);
dx = x2 - x1;
dy = y2 - y1;
pixel_dist = sqrt (SQR (dx) + SQR (dy));
if (dx)
{
angle = gimp_rad_to_deg (atan ((dy/yres) / (dx/xres)));
if (dx > 0)
{
if (dy > 0)
angle = 360.0 - angle;
else if (dy < 0)
angle = -angle;
}
else
{
angle = 180.0 - angle;
}
}
else if (dy)
{
angle = dy > 0 ? 270.0 : 90.0;
}
else
{
angle = 0.0;
}
if (shell->unit == GIMP_UNIT_PIXEL)
{
enhanced_status = g_strdup_printf ("%.1f %s, %.2f\302\260%s%s",
pixel_dist, _("pixels"), angle,
separator, status);
}
else
{
gdouble inch_dist;
gdouble unit_dist;
gint digits = 0;
/* The distance in unit. */
inch_dist = sqrt (SQR (dx / xres) + SQR (dy / yres));
unit_dist = gimp_unit_get_factor (shell->unit) * inch_dist;
/* The ideal digit precision for unit in current resolution. */
if (inch_dist)
digits = gimp_unit_get_scaled_digits (shell->unit,
pixel_dist / inch_dist);
enhanced_status = g_strdup_printf ("%.*f %s, %.2f\302\260%s%s",
digits, unit_dist,
gimp_unit_get_symbol (shell->unit),
angle, separator, status);
}
return enhanced_status;
}
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