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gimp/app/tools/gimpsheartool.c

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/* The GIMP -- an image manipulation program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* 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 2 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, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include <stdlib.h>
#include <gtk/gtk.h>
#include "libgimpmath/gimpmath.h"
#include "libgimpwidgets/gimpwidgets.h"
#include "tools-types.h"
#include "core/gimp-transform-utils.h"
#include "core/gimpimage.h"
#include "core/gimpdrawable-transform.h"
#include "core/gimptoolinfo.h"
#include "widgets/gimphelp-ids.h"
#include "display/gimpdisplay.h"
#ifdef __GNUC__
#warning FIXME #include "gui/gui-types.h"
#endif
#include "gui/gui-types.h"
#include "gui/info-dialog.h"
#include "gimpsheartool.h"
#include "gimptoolcontrol.h"
#include "gimptransformoptions.h"
#include "gimp-intl.h"
/* index into trans_info array */
#define HORZ_OR_VERT 0
#define XSHEAR 1
#define YSHEAR 2
/* the minimum movement before direction of shear can be determined (pixels) */
#define MIN_MOVE 5
/* forward function declarations */
static void gimp_shear_tool_class_init (GimpShearToolClass *klass);
static void gimp_shear_tool_init (GimpShearTool *shear_tool);
static void gimp_shear_tool_dialog (GimpTransformTool *tr_tool);
static void gimp_shear_tool_prepare (GimpTransformTool *tr_tool,
GimpDisplay *gdisp);
static void gimp_shear_tool_motion (GimpTransformTool *tr_tool,
GimpDisplay *gdisp);
static void gimp_shear_tool_recalc (GimpTransformTool *tr_tool,
GimpDisplay *gdisp);
static void shear_info_update (GimpTransformTool *tr_tool);
static void shear_x_mag_changed (GtkWidget *widget,
GimpTransformTool *tr_tool);
static void shear_y_mag_changed (GtkWidget *widget,
GimpTransformTool *tr_tool);
/* variables local to this file */
static gdouble xshear_val;
static gdouble yshear_val;
static GimpTransformToolClass *parent_class = NULL;
/* Public functions */
void
gimp_shear_tool_register (GimpToolRegisterCallback callback,
gpointer data)
{
(* callback) (GIMP_TYPE_SHEAR_TOOL,
GIMP_TYPE_TRANSFORM_OPTIONS,
gimp_transform_options_gui,
0,
"gimp-shear-tool",
_("Shear"),
_("Shear the layer or selection"),
N_("/Tools/Transform Tools/S_hear"), "<shift>S",
NULL, GIMP_HELP_TOOL_SHEAR,
GIMP_STOCK_TOOL_SHEAR,
data);
}
GType
gimp_shear_tool_get_type (void)
{
static GType tool_type = 0;
if (! tool_type)
{
static const GTypeInfo tool_info =
{
sizeof (GimpShearToolClass),
(GBaseInitFunc) NULL,
(GBaseFinalizeFunc) NULL,
(GClassInitFunc) gimp_shear_tool_class_init,
NULL, /* class_finalize */
NULL, /* class_data */
sizeof (GimpShearTool),
0, /* n_preallocs */
(GInstanceInitFunc) gimp_shear_tool_init,
};
tool_type = g_type_register_static (GIMP_TYPE_TRANSFORM_TOOL,
"GimpShearTool",
&tool_info, 0);
}
return tool_type;
}
static void
gimp_shear_tool_class_init (GimpShearToolClass *klass)
{
GimpTransformToolClass *trans_class;
trans_class = GIMP_TRANSFORM_TOOL_CLASS (klass);
parent_class = g_type_class_peek_parent (klass);
trans_class->dialog = gimp_shear_tool_dialog;
trans_class->prepare = gimp_shear_tool_prepare;
trans_class->motion = gimp_shear_tool_motion;
trans_class->recalc = gimp_shear_tool_recalc;
}
static void
gimp_shear_tool_init (GimpShearTool *shear_tool)
{
GimpTool *tool = GIMP_TOOL (shear_tool);
GimpTransformTool *tr_tool = GIMP_TRANSFORM_TOOL (shear_tool);
gimp_tool_control_set_tool_cursor (tool->control, GIMP_SHEAR_TOOL_CURSOR);
tr_tool->use_center = FALSE;
tr_tool->shell_desc = _("Shearing Information");
tr_tool->progress_text = _("Shearing...");
}
static void
gimp_shear_tool_dialog (GimpTransformTool *tr_tool)
{
info_dialog_add_spinbutton (tr_tool->info_dialog,
_("Shear Magnitude X:"),
&xshear_val,
-65536, 65536, 1, 15, 1, 1, 0,
G_CALLBACK (shear_x_mag_changed),
tr_tool);
info_dialog_add_spinbutton (tr_tool->info_dialog,
_("Y:"),
&yshear_val,
-65536, 65536, 1, 15, 1, 1, 0,
G_CALLBACK (shear_y_mag_changed),
tr_tool);
}
static void
gimp_shear_tool_prepare (GimpTransformTool *tr_tool,
GimpDisplay *gdisp)
{
tr_tool->trans_info[HORZ_OR_VERT] = GIMP_ORIENTATION_UNKNOWN;
tr_tool->trans_info[XSHEAR] = 0.0;
tr_tool->trans_info[YSHEAR] = 0.0;
}
static void
gimp_shear_tool_motion (GimpTransformTool *tr_tool,
GimpDisplay *gdisp)
{
gdouble diffx, diffy;
gint dir;
diffx = tr_tool->curx - tr_tool->lastx;
diffy = tr_tool->cury - tr_tool->lasty;
/* If we haven't yet decided on which way to control shearing
* decide using the maximum differential
*/
if (tr_tool->trans_info[HORZ_OR_VERT] == GIMP_ORIENTATION_UNKNOWN)
{
if (abs (diffx) > MIN_MOVE || abs (diffy) > MIN_MOVE)
{
if (abs (diffx) > abs (diffy))
{
tr_tool->trans_info[HORZ_OR_VERT] = GIMP_ORIENTATION_HORIZONTAL;
tr_tool->trans_info[XSHEAR] = 0.0;
}
else
{
tr_tool->trans_info[HORZ_OR_VERT] = GIMP_ORIENTATION_VERTICAL;
tr_tool->trans_info[XSHEAR] = 0.0;
}
}
/* set the current coords to the last ones */
else
{
tr_tool->curx = tr_tool->lastx;
tr_tool->cury = tr_tool->lasty;
}
}
/* if the direction is known, keep track of the magnitude */
if (tr_tool->trans_info[HORZ_OR_VERT] != GIMP_ORIENTATION_UNKNOWN)
{
dir = tr_tool->trans_info[HORZ_OR_VERT];
switch (tr_tool->function)
{
case TRANSFORM_HANDLE_1:
if (dir == GIMP_ORIENTATION_HORIZONTAL)
tr_tool->trans_info[XSHEAR] -= diffx;
else
tr_tool->trans_info[YSHEAR] -= diffy;
break;
case TRANSFORM_HANDLE_2:
if (dir == GIMP_ORIENTATION_HORIZONTAL)
tr_tool->trans_info[XSHEAR] -= diffx;
else
tr_tool->trans_info[YSHEAR] += diffy;
break;
case TRANSFORM_HANDLE_3:
if (dir == GIMP_ORIENTATION_HORIZONTAL)
tr_tool->trans_info[XSHEAR] += diffx;
else
tr_tool->trans_info[YSHEAR] -= diffy;
break;
case TRANSFORM_HANDLE_4:
if (dir == GIMP_ORIENTATION_HORIZONTAL)
tr_tool->trans_info[XSHEAR] += diffx;
else
tr_tool->trans_info[YSHEAR] += diffy;
break;
default:
break;
}
}
}
static void
gimp_shear_tool_recalc (GimpTransformTool *tr_tool,
GimpDisplay *gdisp)
{
gdouble amount;
if (tr_tool->trans_info[HORZ_OR_VERT] == GIMP_ORIENTATION_HORIZONTAL)
amount = tr_tool->trans_info[XSHEAR];
else
amount = tr_tool->trans_info[YSHEAR];
gimp_transform_matrix_shear (tr_tool->x1,
tr_tool->y1,
tr_tool->x2,
tr_tool->y2,
tr_tool->trans_info[HORZ_OR_VERT],
amount,
&tr_tool->transform);
/* transform the bounding box */
gimp_transform_tool_transform_bounding_box (tr_tool);
/* update the information dialog */
shear_info_update (tr_tool);
}
static void
shear_info_update (GimpTransformTool *tr_tool)
{
xshear_val = tr_tool->trans_info[XSHEAR];
yshear_val = tr_tool->trans_info[YSHEAR];
info_dialog_update (tr_tool->info_dialog);
info_dialog_popup (tr_tool->info_dialog);
}
static void
shear_x_mag_changed (GtkWidget *widget,
GimpTransformTool *tr_tool)
{
gdouble value;
value = GTK_ADJUSTMENT (widget)->value;
if (value != tr_tool->trans_info[XSHEAR])
{
gimp_draw_tool_pause (GIMP_DRAW_TOOL (tr_tool));
tr_tool->trans_info[XSHEAR] = value;
gimp_shear_tool_recalc (tr_tool, GIMP_TOOL (tr_tool)->gdisp);
gimp_draw_tool_resume (GIMP_DRAW_TOOL (tr_tool));
}
}
static void
shear_y_mag_changed (GtkWidget *widget,
GimpTransformTool *tr_tool)
{
gdouble value;
value = GTK_ADJUSTMENT (widget)->value;
if (value != tr_tool->trans_info[YSHEAR])
{
gimp_draw_tool_pause (GIMP_DRAW_TOOL (tr_tool));
tr_tool->trans_info[YSHEAR] = value;
gimp_shear_tool_recalc (tr_tool, GIMP_TOOL (tr_tool)->gdisp);
gimp_draw_tool_resume (GIMP_DRAW_TOOL (tr_tool));
}
}
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