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Issue #4846 - Symmetry origin is wrong when painting on offset drawable

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In gimp_symmetry_{mirror,mandala}_update_strokes(), adjust the
symmetry origin according to the drawable offset, so that it
remains fixed relative to the image regardless of the drawable
position.

(cherry picked from commit 6ed9b2bb7a)
This commit is contained in:
Ell
2020-03-26 20:26:51 +02:00
parent 83fd8c6500
commit 7685c16a1e
2 changed files with 26 additions and 12 deletions
Download Patch File Download Diff File Expand all files Collapse all files

23
app/core/gimpsymmetry-mandala.c
View File

@ -456,9 +456,16 @@ gimp_mandala_update_strokes (GimpSymmetry *sym,
GimpMandala *mandala = GIMP_MANDALA (sym);
GimpCoords *coords;
GimpMatrix3 matrix;
gdouble slice_angle;
gdouble mid_slice_angle = 0.0;
gdouble center_x, center_y;
gint offset_x, offset_y;
gint i;
gdouble slice_angle;
gdouble mid_slice_angle = 0.0;
gimp_item_get_offset (GIMP_ITEM (drawable), &offset_x, &offset_y);
center_x = mandala->center_x - offset_x;
center_y = mandala->center_y - offset_y;
g_list_free_full (sym->strokes, g_free);
sym->strokes = NULL;
@ -472,8 +479,8 @@ gimp_mandala_update_strokes (GimpSymmetry *sym,
if (mandala->enable_reflection)
{
/* Find out in which slice the user is currently drawing. */
gdouble angle = atan2 (sym->origin->y - mandala->center_y,
sym->origin->x - mandala->center_x);
gdouble angle = atan2 (sym->origin->y - center_y,
sym->origin->x - center_x);
gint slice_no = (int) floor(angle/slice_angle);
/* Angle where the middle of that slice is. */
@ -487,8 +494,8 @@ gimp_mandala_update_strokes (GimpSymmetry *sym,
coords = g_memdup (sym->origin, sizeof (GimpCoords));
gimp_matrix3_identity (&matrix);
gimp_matrix3_translate (&matrix,
- mandala->center_x,
- mandala->center_y);
-center_x,
-center_y);
if (mandala->enable_reflection && i % 2 == 1)
{
/* Reflecting over the mid_slice_angle axis, reflects slice without changing position. */
@ -501,8 +508,8 @@ gimp_mandala_update_strokes (GimpSymmetry *sym,
gimp_matrix3_rotate (&matrix, - i * slice_angle);
}
gimp_matrix3_translate (&matrix,
mandala->center_x,
mandala->center_y);
+center_x,
+center_y);
gimp_matrix3_transform_point (&matrix,
coords->x,
coords->y,

15
app/core/gimpsymmetry-mirror.c
View File

@ -325,6 +325,13 @@ gimp_mirror_update_strokes (GimpSymmetry *sym,
GimpMirror *mirror = GIMP_MIRROR (sym);
GList *strokes = NULL;
GimpCoords *coords;
gdouble mirror_position_x, mirror_position_y;
gint offset_x, offset_y;
gimp_item_get_offset (GIMP_ITEM (drawable), &offset_x, &offset_y);
mirror_position_x = mirror->mirror_position_x - offset_x;
mirror_position_y = mirror->mirror_position_y - offset_y;
g_list_free_full (sym->strokes, g_free);
strokes = g_list_prepend (strokes,
@ -333,22 +340,22 @@ gimp_mirror_update_strokes (GimpSymmetry *sym,
if (mirror->horizontal_mirror)
{
coords = g_memdup (origin, sizeof (GimpCoords));
coords->y = 2.0 * mirror->mirror_position_y - origin->y;
coords->y = 2.0 * mirror_position_y - origin->y;
strokes = g_list_prepend (strokes, coords);
}
if (mirror->vertical_mirror)
{
coords = g_memdup (origin, sizeof (GimpCoords));
coords->x = 2.0 * mirror->mirror_position_x - origin->x;
coords->x = 2.0 * mirror_position_x - origin->x;
strokes = g_list_prepend (strokes, coords);
}
if (mirror->point_symmetry)
{
coords = g_memdup (origin, sizeof (GimpCoords));
coords->x = 2.0 * mirror->mirror_position_x - origin->x;
coords->y = 2.0 * mirror->mirror_position_y - origin->y;
coords->x = 2.0 * mirror_position_x - origin->x;
coords->y = 2.0 * mirror_position_y - origin->y;
strokes = g_list_prepend (strokes, coords);
}