da6086636b
Add a GimpTransformGridTool::matrix_to_info() virtual function,
which should extract the tool-specific transformation parameters
given a transformation matrix, and the old parameter set (which is
needed in some tools, to derive the parameters that aren't encoded
in the matrix, such as the pivot point). The transformation matrix
can be any combination of matrices calculated by the tool, and
their inverses. Subclasses should only implement this function if
every such matrix can be mapped back to transformation parameters.
This is currently the case for all the transform-grid tools, except
for the shear tool (since it only supports shearing along one of
the horizontal or the vertical directions, however, the combined
matrix may require shearing in both directions).
When a transform-grid tool implements this function, show a chain-
button between the two transform-direction radio-buttons in the
tool options. When the chain-button is linked, whenever the
transform corresponding to the active direction is modified, adjust
the transform corresponding to the non-active direction such that
the overall transform remains the same.
One notable workflow that this enables is transforming a layer
while adjusting a different area than its boundary, by first
defining the area while the transform-directions are linked, and
then transforming the area while the transform-directions are
unlinked.
(cherry picked from commit 39e23267f7)
70 lines
2.8 KiB
C
70 lines
2.8 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 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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#ifndef __GIMP_TRANSFORM_GRID_OPTIONS_H__
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#define __GIMP_TRANSFORM_GRID_OPTIONS_H__
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#include "gimptransformoptions.h"
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#define GIMP_TYPE_TRANSFORM_GRID_OPTIONS (gimp_transform_grid_options_get_type ())
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#define GIMP_TRANSFORM_GRID_OPTIONS(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_TRANSFORM_GRID_OPTIONS, GimpTransformGridOptions))
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#define GIMP_TRANSFORM_GRID_OPTIONS_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GIMP_TYPE_TRANSFORM_GRID_OPTIONS, GimpTransformGridOptionsClass))
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#define GIMP_IS_TRANSFORM_GRID_OPTIONS(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_TRANSFORM_GRID_OPTIONS))
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#define GIMP_IS_TRANSFORM_GRID_OPTIONS_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GIMP_TYPE_TRANSFORM_GRID_OPTIONS))
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#define GIMP_TRANSFORM_GRID_OPTIONS_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GIMP_TYPE_TRANSFORM_GRID_OPTIONS, GimpTransformGridOptionsClass))
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typedef struct _GimpTransformGridOptions GimpTransformGridOptions;
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typedef struct _GimpTransformGridOptionsClass GimpTransformGridOptionsClass;
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struct _GimpTransformGridOptions
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{
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GimpTransformOptions parent_instance;
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gboolean direction_linked;
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gboolean show_preview;
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gdouble preview_opacity;
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GimpGuidesType grid_type;
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gint grid_size;
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gboolean constrain_move;
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gboolean constrain_scale;
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gboolean constrain_rotate;
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gboolean constrain_shear;
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gboolean constrain_perspective;
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gboolean frompivot_scale;
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gboolean frompivot_shear;
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gboolean frompivot_perspective;
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gboolean cornersnap;
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gboolean fixedpivot;
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};
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struct _GimpTransformGridOptionsClass
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{
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GimpTransformOptionsClass parent_class;
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};
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GType gimp_transform_grid_options_get_type (void) G_GNUC_CONST;
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GtkWidget * gimp_transform_grid_options_gui (GimpToolOptions *tool_options);
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gboolean gimp_transform_grid_options_show_preview (GimpTransformGridOptions *options);
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#endif /* __GIMP_TRANSFORM_GRID_OPTIONS_H__ */
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