mirror of https://github.com/GNOME/gimp.git
150 lines
4.3 KiB
C
150 lines
4.3 KiB
C
/* GIMP - The GNU Image Manipulation Program
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* Copyright (C) 1995 Spencer Kimball and Peter Mattis
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include <gegl.h>
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#include <gtk/gtk.h>
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#include "libgimpmath/gimpmath.h"
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#include "display-types.h"
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#include "gimpdisplay.h"
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#include "gimpdisplayshell.h"
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#include "gimpdisplayshell-expose.h"
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#include "gimpdisplayshell-rotate.h"
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#include "gimpdisplayshell-scale.h"
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/* public functions */
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void
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gimp_display_shell_rotate (GimpDisplayShell *shell,
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gdouble delta)
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{
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g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
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gimp_display_shell_rotate_to (shell, shell->rotate_angle + delta);
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}
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void
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gimp_display_shell_rotate_to (GimpDisplayShell *shell,
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gdouble value)
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{
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g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
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while (value < 0.0)
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value += 360;
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while (value >= 360.0)
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value -= 360;
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shell->rotate_angle = value;
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gimp_display_shell_rotated (shell);
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gimp_display_shell_expose_full (shell);
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}
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void
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gimp_display_shell_rotate_drag (GimpDisplayShell *shell,
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gdouble last_x,
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gdouble last_y,
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gdouble cur_x,
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gdouble cur_y,
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gboolean constrain)
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{
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gint image_width, image_height;
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gdouble px, py;
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gdouble x1, y1, x2, y2;
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gdouble angle1, angle2, angle;
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g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
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gimp_display_shell_scale_get_image_size (shell,
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&image_width, &image_height);
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px = -shell->offset_x + image_width / 2;
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py = -shell->offset_y + image_height / 2;
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x1 = cur_x - px;
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x2 = last_x - px;
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y1 = py - cur_y;
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y2 = py - last_y;
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/* find the first angle */
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angle1 = atan2 (y1, x1);
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/* find the angle */
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angle2 = atan2 (y2, x2);
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angle = angle2 - angle1;
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if (angle > G_PI || angle < -G_PI)
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angle = angle2 - ((angle1 < 0) ? 2.0 * G_PI + angle1 : angle1 - 2.0 * G_PI);
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shell->rotate_drag_angle += (angle * 180.0 / G_PI);
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if (shell->rotate_drag_angle < 0.0)
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shell->rotate_drag_angle += 360;
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if (shell->rotate_drag_angle >= 360.0)
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shell->rotate_drag_angle -= 360;
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gimp_display_shell_rotate_to (shell,
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constrain ?
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(gint) shell->rotate_drag_angle / 15 * 15 :
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shell->rotate_drag_angle);
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}
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void
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gimp_display_shell_rotate_update_transform (GimpDisplayShell *shell)
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{
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g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
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g_free (shell->rotate_transform);
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g_free (shell->rotate_untransform);
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if (shell->rotate_angle != 0.0 && gimp_display_get_image (shell->display))
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{
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gint image_width, image_height;
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gdouble cx, cy;
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shell->rotate_transform = g_new (cairo_matrix_t, 1);
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shell->rotate_untransform = g_new (cairo_matrix_t, 1);
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gimp_display_shell_scale_get_image_size (shell,
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&image_width, &image_height);
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cx = -shell->offset_x + image_width / 2;
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cy = -shell->offset_y + image_height / 2;
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cairo_matrix_init_translate (shell->rotate_transform, cx, cy);
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cairo_matrix_rotate (shell->rotate_transform,
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shell->rotate_angle / 180.0 * G_PI);
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cairo_matrix_translate (shell->rotate_transform, -cx, -cy);
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*shell->rotate_untransform = *shell->rotate_transform;
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cairo_matrix_invert (shell->rotate_untransform);
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}
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else
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{
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shell->rotate_transform = NULL;
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shell->rotate_untransform = NULL;
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}
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}
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