PIKApp/app/display/pikacanvasitem-utils.c

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2023-09-26 00:35:21 +02:00
/* PIKA - Photo and Image Kooker Application
* a rebranding of The GNU Image Manipulation Program (created with heckimp)
* A derived work which may be trivial. However, any changes may be (C)2023 by Aldercone Studio
*
* Original copyright, applying to most contents (license remains unchanged):
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* pikacanvasitem-utils.c
* Copyright (C) 2010 Michael Natterer <mitch@gimp.org>
*
* 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 "libpikamath/pikamath.h"
#include "display-types.h"
#include "core/pikaimage.h"
#include "vectors/pikaanchor.h"
#include "vectors/pikabezierstroke.h"
#include "vectors/pikavectors.h"
#include "pikacanvasitem.h"
#include "pikacanvasitem-utils.h"
#include "pikadisplay.h"
#include "pikadisplayshell.h"
#include "pikadisplayshell-transform.h"
gboolean
pika_canvas_item_on_handle (PikaCanvasItem *item,
gdouble x,
gdouble y,
PikaHandleType type,
gdouble handle_x,
gdouble handle_y,
gint width,
gint height,
PikaHandleAnchor anchor)
{
PikaDisplayShell *shell;
gdouble tx, ty;
gdouble handle_tx, handle_ty;
g_return_val_if_fail (PIKA_IS_CANVAS_ITEM (item), FALSE);
shell = pika_canvas_item_get_shell (item);
pika_display_shell_zoom_xy_f (shell,
x, y,
&tx, &ty);
pika_display_shell_zoom_xy_f (shell,
handle_x, handle_y,
&handle_tx, &handle_ty);
switch (type)
{
case PIKA_HANDLE_SQUARE:
case PIKA_HANDLE_FILLED_SQUARE:
case PIKA_HANDLE_CROSS:
case PIKA_HANDLE_CROSSHAIR:
pika_canvas_item_shift_to_north_west (anchor,
handle_tx, handle_ty,
width, height,
&handle_tx, &handle_ty);
return (tx == CLAMP (tx, handle_tx, handle_tx + width) &&
ty == CLAMP (ty, handle_ty, handle_ty + height));
case PIKA_HANDLE_CIRCLE:
case PIKA_HANDLE_FILLED_CIRCLE:
pika_canvas_item_shift_to_center (anchor,
handle_tx, handle_ty,
width, height,
&handle_tx, &handle_ty);
/* FIXME */
if (width != height)
width = (width + height) / 2;
width /= 2;
return ((SQR (handle_tx - tx) + SQR (handle_ty - ty)) < SQR (width));
default:
g_warning ("%s: invalid handle type %d", G_STRFUNC, type);
break;
}
return FALSE;
}
gboolean
pika_canvas_item_on_vectors_handle (PikaCanvasItem *item,
PikaVectors *vectors,
const PikaCoords *coord,
gint width,
gint height,
PikaAnchorType preferred,
gboolean exclusive,
PikaAnchor **ret_anchor,
PikaStroke **ret_stroke)
{
PikaStroke *stroke = NULL;
PikaStroke *pref_stroke = NULL;
PikaAnchor *anchor = NULL;
PikaAnchor *pref_anchor = NULL;
gdouble dx, dy;
gdouble pref_mindist = -1;
gdouble mindist = -1;
g_return_val_if_fail (PIKA_IS_CANVAS_ITEM (item), FALSE);
g_return_val_if_fail (PIKA_IS_VECTORS (vectors), FALSE);
g_return_val_if_fail (coord != NULL, FALSE);
if (ret_anchor) *ret_anchor = NULL;
if (ret_stroke) *ret_stroke = NULL;
while ((stroke = pika_vectors_stroke_get_next (vectors, stroke)))
{
GList *anchor_list;
GList *list;
anchor_list = g_list_concat (pika_stroke_get_draw_anchors (stroke),
pika_stroke_get_draw_controls (stroke));
for (list = anchor_list; list; list = g_list_next (list))
{
dx = coord->x - PIKA_ANCHOR (list->data)->position.x;
dy = coord->y - PIKA_ANCHOR (list->data)->position.y;
if (mindist < 0 || mindist > dx * dx + dy * dy)
{
mindist = dx * dx + dy * dy;
anchor = PIKA_ANCHOR (list->data);
if (ret_stroke)
*ret_stroke = stroke;
}
if ((pref_mindist < 0 || pref_mindist > dx * dx + dy * dy) &&
PIKA_ANCHOR (list->data)->type == preferred)
{
pref_mindist = dx * dx + dy * dy;
pref_anchor = PIKA_ANCHOR (list->data);
pref_stroke = stroke;
}
}
g_list_free (anchor_list);
}
/* If the data passed into ret_anchor is a preferred anchor, return it. */
if (ret_anchor && *ret_anchor &&
pika_canvas_item_on_handle (item,
coord->x,
coord->y,
PIKA_HANDLE_CIRCLE,
(*ret_anchor)->position.x,
(*ret_anchor)->position.y,
width, height,
PIKA_HANDLE_ANCHOR_CENTER) &&
(*ret_anchor)->type == preferred)
{
if (ret_stroke) *ret_stroke = pref_stroke;
return TRUE;
}
if (pref_anchor && pika_canvas_item_on_handle (item,
coord->x,
coord->y,
PIKA_HANDLE_CIRCLE,
pref_anchor->position.x,
pref_anchor->position.y,
width, height,
PIKA_HANDLE_ANCHOR_CENTER))
{
if (ret_anchor) *ret_anchor = pref_anchor;
if (ret_stroke) *ret_stroke = pref_stroke;
return TRUE;
}
else if (!exclusive && anchor &&
pika_canvas_item_on_handle (item,
coord->x,
coord->y,
PIKA_HANDLE_CIRCLE,
anchor->position.x,
anchor->position.y,
width, height,
PIKA_HANDLE_ANCHOR_CENTER))
{
if (ret_anchor)
*ret_anchor = anchor;
/* *ret_stroke already set correctly. */
return TRUE;
}
if (ret_anchor)
*ret_anchor = NULL;
if (ret_stroke)
*ret_stroke = NULL;
return FALSE;
}
gboolean
pika_canvas_item_on_vectors_curve (PikaCanvasItem *item,
PikaVectors *vectors,
const PikaCoords *coord,
gint width,
gint height,
PikaCoords *ret_coords,
gdouble *ret_pos,
PikaAnchor **ret_segment_start,
PikaAnchor **ret_segment_end,
PikaStroke **ret_stroke)
{
PikaStroke *stroke = NULL;
PikaAnchor *segment_start;
PikaAnchor *segment_end;
PikaCoords min_coords = PIKA_COORDS_DEFAULT_VALUES;
PikaCoords cur_coords;
gdouble min_dist, cur_dist, cur_pos;
g_return_val_if_fail (PIKA_IS_CANVAS_ITEM (item), FALSE);
g_return_val_if_fail (PIKA_IS_VECTORS (vectors), FALSE);
g_return_val_if_fail (coord != NULL, FALSE);
if (ret_coords) *ret_coords = *coord;
if (ret_pos) *ret_pos = -1.0;
if (ret_segment_start) *ret_segment_start = NULL;
if (ret_segment_end) *ret_segment_end = NULL;
if (ret_stroke) *ret_stroke = NULL;
min_dist = -1.0;
while ((stroke = pika_vectors_stroke_get_next (vectors, stroke)))
{
cur_dist = pika_stroke_nearest_point_get (stroke, coord, 1.0,
&cur_coords,
&segment_start,
&segment_end,
&cur_pos);
if (cur_dist >= 0 && (min_dist < 0 || cur_dist < min_dist))
{
min_dist = cur_dist;
min_coords = cur_coords;
if (ret_coords) *ret_coords = cur_coords;
if (ret_pos) *ret_pos = cur_pos;
if (ret_segment_start) *ret_segment_start = segment_start;
if (ret_segment_end) *ret_segment_end = segment_end;
if (ret_stroke) *ret_stroke = stroke;
}
}
if (min_dist >= 0 &&
pika_canvas_item_on_handle (item,
coord->x,
coord->y,
PIKA_HANDLE_CIRCLE,
min_coords.x,
min_coords.y,
width, height,
PIKA_HANDLE_ANCHOR_CENTER))
{
return TRUE;
}
return FALSE;
}
gboolean
pika_canvas_item_on_vectors (PikaCanvasItem *item,
const PikaCoords *coords,
gint width,
gint height,
PikaCoords *ret_coords,
gdouble *ret_pos,
PikaAnchor **ret_segment_start,
PikaAnchor **ret_segment_end,
PikaStroke **ret_stroke,
PikaVectors **ret_vectors)
{
PikaDisplayShell *shell;
PikaImage *image;
GList *all_vectors;
GList *list;
g_return_val_if_fail (PIKA_IS_CANVAS_ITEM (item), FALSE);
g_return_val_if_fail (coords != NULL, FALSE);
shell = pika_canvas_item_get_shell (item);
image = pika_display_get_image (shell->display);
if (ret_coords) *ret_coords = *coords;
if (ret_pos) *ret_pos = -1.0;
if (ret_segment_start) *ret_segment_start = NULL;
if (ret_segment_end) *ret_segment_end = NULL;
if (ret_stroke) *ret_stroke = NULL;
if (ret_vectors) *ret_vectors = NULL;
all_vectors = pika_image_get_vectors_list (image);
for (list = all_vectors; list; list = g_list_next (list))
{
PikaVectors *vectors = list->data;
if (! pika_item_get_visible (PIKA_ITEM (vectors)))
continue;
if (pika_canvas_item_on_vectors_curve (item,
vectors, coords,
width, height,
ret_coords,
ret_pos,
ret_segment_start,
ret_segment_end,
ret_stroke))
{
if (ret_vectors)
*ret_vectors = vectors;
g_list_free (all_vectors);
return TRUE;
}
}
g_list_free (all_vectors);
return FALSE;
}
void
pika_canvas_item_shift_to_north_west (PikaHandleAnchor anchor,
gdouble x,
gdouble y,
gint width,
gint height,
gdouble *shifted_x,
gdouble *shifted_y)
{
switch (anchor)
{
case PIKA_HANDLE_ANCHOR_CENTER:
x -= width / 2;
y -= height / 2;
break;
case PIKA_HANDLE_ANCHOR_NORTH:
x -= width / 2;
break;
case PIKA_HANDLE_ANCHOR_NORTH_WEST:
/* nothing, this is the default */
break;
case PIKA_HANDLE_ANCHOR_NORTH_EAST:
x -= width;
break;
case PIKA_HANDLE_ANCHOR_SOUTH:
x -= width / 2;
y -= height;
break;
case PIKA_HANDLE_ANCHOR_SOUTH_WEST:
y -= height;
break;
case PIKA_HANDLE_ANCHOR_SOUTH_EAST:
x -= width;
y -= height;
break;
case PIKA_HANDLE_ANCHOR_WEST:
y -= height / 2;
break;
case PIKA_HANDLE_ANCHOR_EAST:
x -= width;
y -= height / 2;
break;
default:
break;
}
if (shifted_x)
*shifted_x = x;
if (shifted_y)
*shifted_y = y;
}
void
pika_canvas_item_shift_to_center (PikaHandleAnchor anchor,
gdouble x,
gdouble y,
gint width,
gint height,
gdouble *shifted_x,
gdouble *shifted_y)
{
switch (anchor)
{
case PIKA_HANDLE_ANCHOR_CENTER:
/* nothing, this is the default */
break;
case PIKA_HANDLE_ANCHOR_NORTH:
y += height / 2;
break;
case PIKA_HANDLE_ANCHOR_NORTH_WEST:
x += width / 2;
y += height / 2;
break;
case PIKA_HANDLE_ANCHOR_NORTH_EAST:
x -= width / 2;
y += height / 2;
break;
case PIKA_HANDLE_ANCHOR_SOUTH:
y -= height / 2;
break;
case PIKA_HANDLE_ANCHOR_SOUTH_WEST:
x += width / 2;
y -= height / 2;
break;
case PIKA_HANDLE_ANCHOR_SOUTH_EAST:
x -= width / 2;
y -= height / 2;
break;
case PIKA_HANDLE_ANCHOR_WEST:
x += width / 2;
break;
case PIKA_HANDLE_ANCHOR_EAST:
x -= width / 2;
break;
default:
break;
}
if (shifted_x)
*shifted_x = x;
if (shifted_y)
*shifted_y = y;
}