397 lines
12 KiB
C
397 lines
12 KiB
C
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/* 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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* 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 <gdk-pixbuf/gdk-pixbuf.h>
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#include <gegl.h>
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#include "libpikamath/pikamath.h"
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#include "paint-types.h"
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#include "core/pikaboundary.h"
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#include "core/pikadrawable.h"
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#include "core/pikaerror.h"
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#include "core/pikacoords.h"
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#include "vectors/pikastroke.h"
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#include "vectors/pikavectors.h"
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#include "pikapaintcore.h"
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#include "pikapaintcore-stroke.h"
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#include "pikapaintoptions.h"
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#include "pika-intl.h"
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static void pika_paint_core_stroke_emulate_dynamics (PikaCoords *coords,
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gint length);
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static const PikaCoords default_coords = PIKA_COORDS_DEFAULT_VALUES;
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gboolean
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pika_paint_core_stroke (PikaPaintCore *core,
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PikaDrawable *drawable,
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PikaPaintOptions *paint_options,
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PikaCoords *strokes,
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gint n_strokes,
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gboolean push_undo,
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GError **error)
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{
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GList *drawables;
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gboolean success = FALSE;
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g_return_val_if_fail (PIKA_IS_PAINT_CORE (core), FALSE);
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g_return_val_if_fail (PIKA_IS_DRAWABLE (drawable), FALSE);
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g_return_val_if_fail (pika_item_is_attached (PIKA_ITEM (drawable)), FALSE);
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g_return_val_if_fail (PIKA_IS_PAINT_OPTIONS (paint_options), FALSE);
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g_return_val_if_fail (strokes != NULL, FALSE);
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g_return_val_if_fail (n_strokes > 0, FALSE);
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g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
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drawables = g_list_prepend (NULL, drawable);
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if (pika_paint_core_start (core, drawables, paint_options, &strokes[0],
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error))
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{
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gint i;
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core->last_coords = strokes[0];
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pika_paint_core_paint (core, drawables, paint_options,
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PIKA_PAINT_STATE_INIT, 0);
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pika_paint_core_paint (core, drawables, paint_options,
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PIKA_PAINT_STATE_MOTION, 0);
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for (i = 1; i < n_strokes; i++)
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{
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pika_paint_core_interpolate (core, drawables, paint_options,
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&strokes[i], 0);
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}
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pika_paint_core_paint (core, drawables, paint_options,
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PIKA_PAINT_STATE_FINISH, 0);
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pika_paint_core_finish (core, drawables, push_undo);
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pika_paint_core_cleanup (core);
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success = TRUE;
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}
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g_list_free (drawables);
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return success;
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}
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gboolean
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pika_paint_core_stroke_boundary (PikaPaintCore *core,
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PikaDrawable *drawable,
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PikaPaintOptions *paint_options,
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gboolean emulate_dynamics,
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const PikaBoundSeg *bound_segs,
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gint n_bound_segs,
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gint offset_x,
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gint offset_y,
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gboolean push_undo,
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GError **error)
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{
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GList *drawables;
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PikaBoundSeg *stroke_segs;
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gint n_stroke_segs;
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PikaCoords *coords;
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gboolean initialized = FALSE;
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gint n_coords;
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gint seg;
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gint s;
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g_return_val_if_fail (PIKA_IS_PAINT_CORE (core), FALSE);
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g_return_val_if_fail (PIKA_IS_DRAWABLE (drawable), FALSE);
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g_return_val_if_fail (pika_item_is_attached (PIKA_ITEM (drawable)), FALSE);
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g_return_val_if_fail (PIKA_IS_PAINT_OPTIONS (paint_options), FALSE);
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g_return_val_if_fail (bound_segs != NULL && n_bound_segs > 0, FALSE);
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g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
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stroke_segs = pika_boundary_sort (bound_segs, n_bound_segs,
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&n_stroke_segs);
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if (n_stroke_segs == 0)
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return TRUE;
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coords = g_new0 (PikaCoords, n_bound_segs + 4);
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seg = 0;
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n_coords = 0;
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/* we offset all coordinates by 0.5 to align the brush with the path */
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coords[n_coords] = default_coords;
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coords[n_coords].x = (gdouble) (stroke_segs[0].x1 + offset_x + 0.5);
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coords[n_coords].y = (gdouble) (stroke_segs[0].y1 + offset_y + 0.5);
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n_coords++;
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drawables = g_list_prepend (NULL, drawable);
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for (s = 0; s < n_stroke_segs; s++)
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{
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while (stroke_segs[seg].x1 != -1 ||
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stroke_segs[seg].x2 != -1 ||
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stroke_segs[seg].y1 != -1 ||
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stroke_segs[seg].y2 != -1)
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{
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coords[n_coords] = default_coords;
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coords[n_coords].x = (gdouble) (stroke_segs[seg].x1 + offset_x + 0.5);
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coords[n_coords].y = (gdouble) (stroke_segs[seg].y1 + offset_y + 0.5);
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n_coords++;
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seg++;
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}
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/* Close the stroke points up */
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coords[n_coords] = coords[0];
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n_coords++;
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if (emulate_dynamics)
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pika_paint_core_stroke_emulate_dynamics (coords, n_coords);
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if (initialized ||
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pika_paint_core_start (core, drawables, paint_options, &coords[0],
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error))
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{
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gint i;
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initialized = TRUE;
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core->cur_coords = coords[0];
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core->last_coords = coords[0];
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pika_paint_core_paint (core, drawables, paint_options,
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PIKA_PAINT_STATE_INIT, 0);
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pika_paint_core_paint (core, drawables, paint_options,
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PIKA_PAINT_STATE_MOTION, 0);
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for (i = 1; i < n_coords; i++)
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{
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pika_paint_core_interpolate (core, drawables, paint_options,
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&coords[i], 0);
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}
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pika_paint_core_paint (core, drawables, paint_options,
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PIKA_PAINT_STATE_FINISH, 0);
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}
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else
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{
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break;
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}
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n_coords = 0;
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seg++;
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coords[n_coords] = default_coords;
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coords[n_coords].x = (gdouble) (stroke_segs[seg].x1 + offset_x + 0.5);
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coords[n_coords].y = (gdouble) (stroke_segs[seg].y1 + offset_y + 0.5);
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n_coords++;
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}
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if (initialized)
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{
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pika_paint_core_finish (core, drawables, push_undo);
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pika_paint_core_cleanup (core);
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}
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g_list_free (drawables);
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g_free (coords);
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g_free (stroke_segs);
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return initialized;
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}
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gboolean
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pika_paint_core_stroke_vectors (PikaPaintCore *core,
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PikaDrawable *drawable,
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PikaPaintOptions *paint_options,
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gboolean emulate_dynamics,
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PikaVectors *vectors,
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gboolean push_undo,
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GError **error)
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{
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GList *drawables;
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GList *stroke;
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gboolean initialized = FALSE;
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gboolean due_to_lack_of_points = FALSE;
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gint off_x, off_y;
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g_return_val_if_fail (PIKA_IS_PAINT_CORE (core), FALSE);
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g_return_val_if_fail (PIKA_IS_DRAWABLE (drawable), FALSE);
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g_return_val_if_fail (pika_item_is_attached (PIKA_ITEM (drawable)), FALSE);
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g_return_val_if_fail (PIKA_IS_PAINT_OPTIONS (paint_options), FALSE);
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g_return_val_if_fail (PIKA_IS_VECTORS (vectors), FALSE);
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g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
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pika_item_get_offset (PIKA_ITEM (vectors), &off_x, &off_y);
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drawables = g_list_prepend (NULL, drawable);
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for (stroke = vectors->strokes->head;
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stroke;
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stroke = stroke->next)
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{
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GArray *coords;
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gboolean closed;
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coords = pika_stroke_interpolate (PIKA_STROKE (stroke->data),
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1.0, &closed);
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if (coords && coords->len)
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{
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gint i;
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for (i = 0; i < coords->len; i++)
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{
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g_array_index (coords, PikaCoords, i).x += off_x;
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g_array_index (coords, PikaCoords, i).y += off_y;
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}
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if (emulate_dynamics)
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pika_paint_core_stroke_emulate_dynamics ((PikaCoords *) coords->data,
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coords->len);
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if (initialized ||
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pika_paint_core_start (core, drawables, paint_options,
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&g_array_index (coords, PikaCoords, 0),
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error))
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{
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initialized = TRUE;
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core->cur_coords = g_array_index (coords, PikaCoords, 0);
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core->last_coords = g_array_index (coords, PikaCoords, 0);
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pika_paint_core_paint (core, drawables, paint_options,
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PIKA_PAINT_STATE_INIT, 0);
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pika_paint_core_paint (core, drawables, paint_options,
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PIKA_PAINT_STATE_MOTION, 0);
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for (i = 1; i < coords->len; i++)
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{
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pika_paint_core_interpolate (core, drawables, paint_options,
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&g_array_index (coords, PikaCoords, i),
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0);
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}
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pika_paint_core_paint (core, drawables, paint_options,
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PIKA_PAINT_STATE_FINISH, 0);
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}
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else
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{
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if (coords)
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g_array_free (coords, TRUE);
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break;
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}
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}
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else
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{
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due_to_lack_of_points = TRUE;
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}
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if (coords)
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g_array_free (coords, TRUE);
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}
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if (initialized)
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{
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pika_paint_core_finish (core, drawables, push_undo);
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pika_paint_core_cleanup (core);
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}
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if (! initialized && due_to_lack_of_points && *error == NULL)
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{
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g_set_error_literal (error, PIKA_ERROR, PIKA_FAILED,
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_("Not enough points to stroke"));
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}
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g_list_free (drawables);
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return initialized;
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}
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static void
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pika_paint_core_stroke_emulate_dynamics (PikaCoords *coords,
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gint length)
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{
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const gint ramp_length = length / 3;
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/* Calculate and create pressure ramp parameters */
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if (ramp_length > 0)
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{
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gdouble slope = 1.0 / (gdouble) (ramp_length);
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gint i;
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/* Calculate pressure start ramp */
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for (i = 0; i < ramp_length; i++)
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{
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coords[i].pressure = i * slope;
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}
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/* Calculate pressure end ramp */
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for (i = length - ramp_length; i < length; i++)
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{
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coords[i].pressure = 1.0 - (i - (length - ramp_length)) * slope;
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}
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}
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/* Calculate and create velocity ramp parameters */
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if (length > 0)
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{
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gdouble slope = 1.0 / length;
|
||
|
|
gint i;
|
||
|
|
|
||
|
|
/* Calculate velocity end ramp */
|
||
|
|
for (i = 0; i < length; i++)
|
||
|
|
{
|
||
|
|
coords[i].velocity = i * slope;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (length > 1)
|
||
|
|
{
|
||
|
|
gint i;
|
||
|
|
/* Fill in direction */
|
||
|
|
for (i = 1; i < length; i++)
|
||
|
|
{
|
||
|
|
coords[i].direction = pika_coords_direction (&coords[i-1], &coords[i]);
|
||
|
|
}
|
||
|
|
|
||
|
|
coords[0].direction = coords[1].direction;
|
||
|
|
}
|
||
|
|
}
|
