9f5c347d4e
2008-07-12 Martin Nordholts <martinn@svn.gnome.org> * app/display/gimpdisplayshell-scroll.c: Replace gimp_display_shell_scroll() with gimp_display_shell_center_around_image_coordinate() since that is easier to map to something sensible when we allow to scroll beyond image border. * app/display/gimpnavigationeditor.c (gimp_navigation_editor_marker_changed): Adapt to the new interface. svn path=/trunk/; revision=26162
292 lines
7.8 KiB
C
292 lines
7.8 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 2 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, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include "config.h"
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#include <stdlib.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 "core/gimpimage.h"
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#include "gimpdisplay.h"
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#include "gimpdisplay-foreach.h"
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#include "gimpdisplayshell.h"
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#include "gimpdisplayshell-private.h"
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#include "gimpdisplayshell-scale.h"
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#include "gimpdisplayshell-scroll.h"
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void
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gimp_display_shell_center_around_image_coordinate (GimpDisplayShell *shell,
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gdouble image_x,
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gdouble image_y)
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{
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gint scaled_image_x;
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gint scaled_image_y;
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gint offset_to_apply_x;
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gint offset_to_apply_y;
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scaled_image_x = RINT (image_x * shell->scale_x);
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scaled_image_y = RINT (image_y * shell->scale_y);
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offset_to_apply_x = scaled_image_x - shell->disp_width / 2 - shell->offset_x;
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offset_to_apply_y = scaled_image_y - shell->disp_height / 2 - shell->offset_y;
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gimp_display_shell_scroll_private (shell,
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offset_to_apply_x,
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offset_to_apply_y);
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}
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void
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gimp_display_shell_scroll_private (GimpDisplayShell *shell,
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gint x_offset,
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gint y_offset)
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{
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gint old_x;
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gint old_y;
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g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
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old_x = shell->offset_x;
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old_y = shell->offset_y;
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shell->offset_x += x_offset;
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shell->offset_y += y_offset;
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gimp_display_shell_scroll_clamp_offsets (shell);
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/* the actual changes in offset */
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x_offset = (shell->offset_x - old_x);
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y_offset = (shell->offset_y - old_y);
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if (x_offset || y_offset)
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{
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/* reset the old values so that the tool can accurately redraw */
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shell->offset_x = old_x;
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shell->offset_y = old_y;
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gimp_display_shell_pause (shell);
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/* set the offsets back to the new values */
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shell->offset_x += x_offset;
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shell->offset_y += y_offset;
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gdk_window_scroll (shell->canvas->window, -x_offset, -y_offset);
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/* Make sure expose events are processed before scrolling again */
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gdk_window_process_updates (shell->canvas->window, FALSE);
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/* Update scrollbars and rulers */
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gimp_display_shell_scale_setup (shell);
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gimp_display_shell_resume (shell);
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gimp_display_shell_scrolled (shell);
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}
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}
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void
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gimp_display_shell_scroll_clamp_offsets (GimpDisplayShell *shell)
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{
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g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
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if (shell->display->image)
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{
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gint sw, sh;
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sw = SCALEX (shell, gimp_image_get_width (shell->display->image));
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sh = SCALEY (shell, gimp_image_get_height (shell->display->image));
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if (shell->disp_width > sw)
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{
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shell->offset_x = -(shell->disp_width - sw) / 2;
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}
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else
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{
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gint min_offset_x = 0;
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gint max_offset_x = sw - shell->disp_width;
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shell->offset_x = CLAMP (shell->offset_x, min_offset_x, max_offset_x);
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}
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if (shell->disp_height > sh)
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{
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shell->offset_y = -(shell->disp_height - sh) / 2;
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}
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else
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{
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gint min_offset_y = 0;
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gint max_offset_y = sh - shell->disp_height;
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shell->offset_y = CLAMP (shell->offset_y, min_offset_y, max_offset_y);
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}
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}
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else
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{
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shell->offset_x = 0;
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shell->offset_y = 0;
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}
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}
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/**
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* gimp_display_shell_get_scaled_viewport:
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* @shell:
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* @x:
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* @y:
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* @w:
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* @h:
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*
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* Gets the viewport in screen coordinates, with origin at (0, 0) in
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* the image
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*
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**/
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void
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gimp_display_shell_get_scaled_viewport (const GimpDisplayShell *shell,
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gint *x,
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gint *y,
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gint *w,
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gint *h)
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{
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gint scaled_image_viewport_offset_x;
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gint scaled_image_viewport_offset_y;
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g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
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gimp_display_shell_get_scaled_image_viewport_offset (shell,
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&scaled_image_viewport_offset_x,
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&scaled_image_viewport_offset_y);
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if (x) *x = -scaled_image_viewport_offset_x;
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if (y) *y = -scaled_image_viewport_offset_y;
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if (w) *w = shell->disp_width;
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if (h) *h = shell->disp_height;
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}
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/**
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* gimp_display_shell_get_viewport:
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* @shell:
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* @x:
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* @y:
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* @w:
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* @h:
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*
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* Gets the viewport in image coordinates
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*
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**/
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void
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gimp_display_shell_get_viewport (const GimpDisplayShell *shell,
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gdouble *x,
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gdouble *y,
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gdouble *w,
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gdouble *h)
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{
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g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
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if (x) *x = shell->offset_x / shell->scale_x;
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if (y) *y = shell->offset_y / shell->scale_y;
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if (w) *w = shell->disp_width / shell->scale_x;
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if (h) *h = shell->disp_height / shell->scale_y;
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}
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/**
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* gimp_display_shell_get_scaled_image_viewport_offset:
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* @shell:
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* @x:
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* @y:
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*
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* Gets the scaled image offset in viewport coordinates
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*
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**/
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void
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gimp_display_shell_get_scaled_image_viewport_offset (const GimpDisplayShell *shell,
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gint *x,
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gint *y)
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{
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g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
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if (x) *x = -shell->offset_x;
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if (y) *y = -shell->offset_y;
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}
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/**
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* gimp_display_shell_get_disp_offset:
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* @shell:
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* @disp_xoffset:
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* @disp_yoffset:
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*
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* In viewport coordinates, get the offset of where to start rendering
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* the scaled image.
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*
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**/
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void
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gimp_display_shell_get_disp_offset (const GimpDisplayShell *shell,
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gint *disp_xoffset,
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gint *disp_yoffset)
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{
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g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
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if (disp_xoffset)
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{
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if (shell->offset_x < 0)
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{
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*disp_xoffset = -shell->offset_x;
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}
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else
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{
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*disp_xoffset = 0;
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}
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}
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if (disp_yoffset)
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{
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if (shell->offset_y < 0)
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{
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*disp_yoffset = -shell->offset_y;
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}
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else
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{
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*disp_yoffset = 0;
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}
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}
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}
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/**
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* gimp_display_shell_get_render_start_offset:
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* @shell:
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* @offset_x:
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* @offset_y:
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*
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* Get the offset into the scaled image that we should start render
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* from
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*
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**/
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void
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gimp_display_shell_get_render_start_offset (const GimpDisplayShell *shell,
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gint *offset_x,
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gint *offset_y)
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{
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g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
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if (offset_x) *offset_x = MAX (0, shell->offset_x);
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if (offset_y) *offset_y = MAX (0, shell->offset_y);
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}
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