479 lines
15 KiB
C
479 lines
15 KiB
C
/* PIKA - Photo and Image Kooker Application
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* a rebranding of The GNU Image Manipulation Program (created with heckimp)
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* A derived work which may be trivial. However, any changes may be (C)2023 by Aldercone Studio
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*
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* Original copyright, applying to most contents (license remains unchanged):
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* Copyright (C) 1995 Spencer Kimball and Peter Mattis
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*
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* pikacanvasitem-utils.c
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* Copyright (C) 2010 Michael Natterer <mitch@gimp.org>
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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 <https://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 "libpikamath/pikamath.h"
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#include "display-types.h"
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#include "core/pikaimage.h"
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#include "vectors/pikaanchor.h"
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#include "vectors/pikabezierstroke.h"
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#include "vectors/pikavectors.h"
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#include "pikacanvasitem.h"
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#include "pikacanvasitem-utils.h"
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#include "pikadisplay.h"
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#include "pikadisplayshell.h"
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#include "pikadisplayshell-transform.h"
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gboolean
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pika_canvas_item_on_handle (PikaCanvasItem *item,
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gdouble x,
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gdouble y,
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PikaHandleType type,
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gdouble handle_x,
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gdouble handle_y,
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gint width,
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gint height,
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PikaHandleAnchor anchor)
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{
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PikaDisplayShell *shell;
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gdouble tx, ty;
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gdouble handle_tx, handle_ty;
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g_return_val_if_fail (PIKA_IS_CANVAS_ITEM (item), FALSE);
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shell = pika_canvas_item_get_shell (item);
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pika_display_shell_zoom_xy_f (shell,
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x, y,
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&tx, &ty);
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pika_display_shell_zoom_xy_f (shell,
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handle_x, handle_y,
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&handle_tx, &handle_ty);
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switch (type)
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{
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case PIKA_HANDLE_SQUARE:
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case PIKA_HANDLE_FILLED_SQUARE:
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case PIKA_HANDLE_CROSS:
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case PIKA_HANDLE_CROSSHAIR:
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pika_canvas_item_shift_to_north_west (anchor,
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handle_tx, handle_ty,
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width, height,
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&handle_tx, &handle_ty);
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return (tx == CLAMP (tx, handle_tx, handle_tx + width) &&
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ty == CLAMP (ty, handle_ty, handle_ty + height));
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case PIKA_HANDLE_CIRCLE:
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case PIKA_HANDLE_FILLED_CIRCLE:
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pika_canvas_item_shift_to_center (anchor,
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handle_tx, handle_ty,
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width, height,
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&handle_tx, &handle_ty);
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/* FIXME */
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if (width != height)
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width = (width + height) / 2;
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width /= 2;
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return ((SQR (handle_tx - tx) + SQR (handle_ty - ty)) < SQR (width));
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default:
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g_warning ("%s: invalid handle type %d", G_STRFUNC, type);
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break;
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}
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return FALSE;
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}
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gboolean
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pika_canvas_item_on_vectors_handle (PikaCanvasItem *item,
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PikaVectors *vectors,
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const PikaCoords *coord,
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gint width,
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gint height,
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PikaAnchorType preferred,
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gboolean exclusive,
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PikaAnchor **ret_anchor,
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PikaStroke **ret_stroke)
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{
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PikaStroke *stroke = NULL;
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PikaStroke *pref_stroke = NULL;
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PikaAnchor *anchor = NULL;
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PikaAnchor *pref_anchor = NULL;
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gdouble dx, dy;
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gdouble pref_mindist = -1;
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gdouble mindist = -1;
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g_return_val_if_fail (PIKA_IS_CANVAS_ITEM (item), FALSE);
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g_return_val_if_fail (PIKA_IS_VECTORS (vectors), FALSE);
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g_return_val_if_fail (coord != NULL, FALSE);
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if (ret_anchor) *ret_anchor = NULL;
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if (ret_stroke) *ret_stroke = NULL;
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while ((stroke = pika_vectors_stroke_get_next (vectors, stroke)))
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{
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GList *anchor_list;
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GList *list;
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anchor_list = g_list_concat (pika_stroke_get_draw_anchors (stroke),
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pika_stroke_get_draw_controls (stroke));
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for (list = anchor_list; list; list = g_list_next (list))
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{
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dx = coord->x - PIKA_ANCHOR (list->data)->position.x;
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dy = coord->y - PIKA_ANCHOR (list->data)->position.y;
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if (mindist < 0 || mindist > dx * dx + dy * dy)
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{
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mindist = dx * dx + dy * dy;
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anchor = PIKA_ANCHOR (list->data);
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if (ret_stroke)
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*ret_stroke = stroke;
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}
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if ((pref_mindist < 0 || pref_mindist > dx * dx + dy * dy) &&
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PIKA_ANCHOR (list->data)->type == preferred)
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{
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pref_mindist = dx * dx + dy * dy;
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pref_anchor = PIKA_ANCHOR (list->data);
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pref_stroke = stroke;
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}
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}
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g_list_free (anchor_list);
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}
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/* If the data passed into ret_anchor is a preferred anchor, return it. */
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if (ret_anchor && *ret_anchor &&
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pika_canvas_item_on_handle (item,
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coord->x,
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coord->y,
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PIKA_HANDLE_CIRCLE,
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(*ret_anchor)->position.x,
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(*ret_anchor)->position.y,
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width, height,
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PIKA_HANDLE_ANCHOR_CENTER) &&
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(*ret_anchor)->type == preferred)
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{
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if (ret_stroke) *ret_stroke = pref_stroke;
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return TRUE;
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}
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if (pref_anchor && pika_canvas_item_on_handle (item,
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coord->x,
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coord->y,
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PIKA_HANDLE_CIRCLE,
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pref_anchor->position.x,
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pref_anchor->position.y,
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width, height,
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PIKA_HANDLE_ANCHOR_CENTER))
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{
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if (ret_anchor) *ret_anchor = pref_anchor;
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if (ret_stroke) *ret_stroke = pref_stroke;
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return TRUE;
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}
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else if (!exclusive && anchor &&
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pika_canvas_item_on_handle (item,
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coord->x,
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coord->y,
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PIKA_HANDLE_CIRCLE,
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anchor->position.x,
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anchor->position.y,
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width, height,
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PIKA_HANDLE_ANCHOR_CENTER))
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{
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if (ret_anchor)
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*ret_anchor = anchor;
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/* *ret_stroke already set correctly. */
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return TRUE;
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}
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if (ret_anchor)
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*ret_anchor = NULL;
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if (ret_stroke)
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*ret_stroke = NULL;
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return FALSE;
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}
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gboolean
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pika_canvas_item_on_vectors_curve (PikaCanvasItem *item,
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PikaVectors *vectors,
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const PikaCoords *coord,
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gint width,
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gint height,
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PikaCoords *ret_coords,
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gdouble *ret_pos,
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PikaAnchor **ret_segment_start,
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PikaAnchor **ret_segment_end,
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PikaStroke **ret_stroke)
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{
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PikaStroke *stroke = NULL;
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PikaAnchor *segment_start;
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PikaAnchor *segment_end;
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PikaCoords min_coords = PIKA_COORDS_DEFAULT_VALUES;
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PikaCoords cur_coords;
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gdouble min_dist, cur_dist, cur_pos;
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g_return_val_if_fail (PIKA_IS_CANVAS_ITEM (item), FALSE);
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g_return_val_if_fail (PIKA_IS_VECTORS (vectors), FALSE);
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g_return_val_if_fail (coord != NULL, FALSE);
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if (ret_coords) *ret_coords = *coord;
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if (ret_pos) *ret_pos = -1.0;
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if (ret_segment_start) *ret_segment_start = NULL;
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if (ret_segment_end) *ret_segment_end = NULL;
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if (ret_stroke) *ret_stroke = NULL;
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min_dist = -1.0;
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while ((stroke = pika_vectors_stroke_get_next (vectors, stroke)))
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{
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cur_dist = pika_stroke_nearest_point_get (stroke, coord, 1.0,
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&cur_coords,
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&segment_start,
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&segment_end,
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&cur_pos);
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if (cur_dist >= 0 && (min_dist < 0 || cur_dist < min_dist))
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{
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min_dist = cur_dist;
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min_coords = cur_coords;
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if (ret_coords) *ret_coords = cur_coords;
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if (ret_pos) *ret_pos = cur_pos;
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if (ret_segment_start) *ret_segment_start = segment_start;
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if (ret_segment_end) *ret_segment_end = segment_end;
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if (ret_stroke) *ret_stroke = stroke;
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}
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}
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if (min_dist >= 0 &&
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pika_canvas_item_on_handle (item,
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coord->x,
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coord->y,
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PIKA_HANDLE_CIRCLE,
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min_coords.x,
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min_coords.y,
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width, height,
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PIKA_HANDLE_ANCHOR_CENTER))
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{
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return TRUE;
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}
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return FALSE;
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}
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gboolean
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pika_canvas_item_on_vectors (PikaCanvasItem *item,
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const PikaCoords *coords,
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gint width,
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gint height,
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PikaCoords *ret_coords,
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gdouble *ret_pos,
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PikaAnchor **ret_segment_start,
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PikaAnchor **ret_segment_end,
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PikaStroke **ret_stroke,
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PikaVectors **ret_vectors)
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{
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PikaDisplayShell *shell;
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PikaImage *image;
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GList *all_vectors;
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GList *list;
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g_return_val_if_fail (PIKA_IS_CANVAS_ITEM (item), FALSE);
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g_return_val_if_fail (coords != NULL, FALSE);
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shell = pika_canvas_item_get_shell (item);
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image = pika_display_get_image (shell->display);
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if (ret_coords) *ret_coords = *coords;
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if (ret_pos) *ret_pos = -1.0;
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if (ret_segment_start) *ret_segment_start = NULL;
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if (ret_segment_end) *ret_segment_end = NULL;
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if (ret_stroke) *ret_stroke = NULL;
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if (ret_vectors) *ret_vectors = NULL;
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all_vectors = pika_image_get_vectors_list (image);
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for (list = all_vectors; list; list = g_list_next (list))
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{
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PikaVectors *vectors = list->data;
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if (! pika_item_get_visible (PIKA_ITEM (vectors)))
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continue;
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if (pika_canvas_item_on_vectors_curve (item,
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vectors, coords,
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width, height,
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ret_coords,
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ret_pos,
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ret_segment_start,
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ret_segment_end,
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ret_stroke))
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{
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if (ret_vectors)
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*ret_vectors = vectors;
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g_list_free (all_vectors);
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return TRUE;
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}
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}
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g_list_free (all_vectors);
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return FALSE;
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}
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void
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pika_canvas_item_shift_to_north_west (PikaHandleAnchor anchor,
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gdouble x,
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gdouble y,
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gint width,
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gint height,
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gdouble *shifted_x,
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gdouble *shifted_y)
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{
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switch (anchor)
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{
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case PIKA_HANDLE_ANCHOR_CENTER:
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x -= width / 2;
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y -= height / 2;
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break;
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case PIKA_HANDLE_ANCHOR_NORTH:
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x -= width / 2;
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break;
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case PIKA_HANDLE_ANCHOR_NORTH_WEST:
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/* nothing, this is the default */
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break;
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case PIKA_HANDLE_ANCHOR_NORTH_EAST:
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x -= width;
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break;
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case PIKA_HANDLE_ANCHOR_SOUTH:
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x -= width / 2;
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y -= height;
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break;
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case PIKA_HANDLE_ANCHOR_SOUTH_WEST:
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y -= height;
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break;
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case PIKA_HANDLE_ANCHOR_SOUTH_EAST:
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x -= width;
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y -= height;
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break;
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case PIKA_HANDLE_ANCHOR_WEST:
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y -= height / 2;
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break;
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case PIKA_HANDLE_ANCHOR_EAST:
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x -= width;
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y -= height / 2;
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break;
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default:
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break;
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}
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if (shifted_x)
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*shifted_x = x;
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if (shifted_y)
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*shifted_y = y;
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}
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void
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pika_canvas_item_shift_to_center (PikaHandleAnchor anchor,
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gdouble x,
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gdouble y,
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gint width,
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gint height,
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gdouble *shifted_x,
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gdouble *shifted_y)
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{
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switch (anchor)
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{
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case PIKA_HANDLE_ANCHOR_CENTER:
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/* nothing, this is the default */
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break;
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case PIKA_HANDLE_ANCHOR_NORTH:
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y += height / 2;
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break;
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case PIKA_HANDLE_ANCHOR_NORTH_WEST:
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x += width / 2;
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y += height / 2;
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break;
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case PIKA_HANDLE_ANCHOR_NORTH_EAST:
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x -= width / 2;
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y += height / 2;
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break;
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case PIKA_HANDLE_ANCHOR_SOUTH:
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y -= height / 2;
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break;
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case PIKA_HANDLE_ANCHOR_SOUTH_WEST:
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x += width / 2;
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y -= height / 2;
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break;
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case PIKA_HANDLE_ANCHOR_SOUTH_EAST:
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x -= width / 2;
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y -= height / 2;
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break;
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case PIKA_HANDLE_ANCHOR_WEST:
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x += width / 2;
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break;
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case PIKA_HANDLE_ANCHOR_EAST:
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x -= width / 2;
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break;
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default:
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break;
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}
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if (shifted_x)
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*shifted_x = x;
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if (shifted_y)
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*shifted_y = y;
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}
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