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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 "gui/gui-types.h"
#include "core/gimpimage.h"
#include "core/gimpdrawable-transform.h"
#include "core/gimpdrawable-transform-utils.h"
#include "core/gimptoolinfo.h"
#include "display/gimpdisplay.h"
#include "gui/info-dialog.h"
#include "gimpsheartool.h"
#include "tool_manager.h"
#include "transform_options.h"
#include "libgimp/gimpintl.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 TileManager * gimp_shear_tool_transform (GimpTransformTool *tr_tool,
GimpDisplay *gdisp,
TransformState state);
static void shear_tool_recalc (GimpTransformTool *tr_tool,
GimpDisplay *gdisp);
static void shear_tool_motion (GimpTransformTool *tr_tool,
GimpDisplay *gdisp);
static void shear_info_update (GimpTransformTool *tr_tool);
static void shear_x_mag_changed (GtkWidget *widget,
gpointer data);
static void shear_y_mag_changed (GtkWidget *widget,
gpointer data);
/* variables local to this file */
static gdouble xshear_val;
static gdouble yshear_val;
static GimpTransformToolClass *parent_class = NULL;
static TransformOptions *shear_options = NULL;
/* Public functions */
void
gimp_shear_tool_register (Gimp *gimp)
{
tool_manager_register_tool (gimp,
GIMP_TYPE_SHEAR_TOOL,
FALSE,
"gimp:shear_tool",
_("Shear Tool"),
_("Shear the layer or selection"),
N_("/Tools/Transform Tools/Shear"), "<shift>F",
NULL, "tools/shear.html",
GIMP_STOCK_TOOL_SHEAR);
}
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->transform = gimp_shear_tool_transform;
}
static void
gimp_shear_tool_init (GimpShearTool *shear_tool)
{
GimpTool *tool;
GimpTransformTool *transform_tool;
tool = GIMP_TOOL (shear_tool);
transform_tool = GIMP_TRANSFORM_TOOL (shear_tool);
if (! shear_options)
{
shear_options = transform_options_new (GIMP_TYPE_SHEAR_TOOL,
transform_options_reset);
tool_manager_register_tool_options (GIMP_TYPE_SHEAR_TOOL,
(GimpToolOptions *) shear_options);
}
tool->tool_cursor = GIMP_SHEAR_TOOL_CURSOR;
}
static TileManager *
gimp_shear_tool_transform (GimpTransformTool *transform_tool,
GimpDisplay *gdisp,
TransformState state)
{
switch (state)
{
case TRANSFORM_INIT:
if (! transform_info)
{
transform_info = info_dialog_new (_("Shear Information"),
gimp_standard_help_func,
"tools/transform_shear.html");
info_dialog_add_spinbutton (transform_info,
_("Shear Magnitude X:"),
&xshear_val,
-65536, 65536, 1, 15, 1, 1, 0,
G_CALLBACK (shear_x_mag_changed),
transform_tool);
info_dialog_add_spinbutton (transform_info,
_("Y:"),
&yshear_val,
-65536, 65536, 1, 15, 1, 1, 0,
G_CALLBACK (shear_y_mag_changed),
transform_tool);
}
gtk_widget_set_sensitive (GTK_WIDGET (transform_info->shell), TRUE);
transform_tool->trans_info[HORZ_OR_VERT] = ORIENTATION_UNKNOWN;
transform_tool->trans_info[XSHEAR] = 0.0;
transform_tool->trans_info[YSHEAR] = 0.0;
break;
case TRANSFORM_MOTION:
shear_tool_motion (transform_tool, gdisp);
shear_tool_recalc (transform_tool, gdisp);
break;
case TRANSFORM_RECALC:
shear_tool_recalc (transform_tool, gdisp);
break;
case TRANSFORM_FINISH:
return gimp_transform_tool_transform_tiles (transform_tool,
_("Shearing..."));
break;
}
return NULL;
}
static void
shear_info_update (GimpTransformTool *transform_tool)
{
xshear_val = transform_tool->trans_info[XSHEAR];
yshear_val = transform_tool->trans_info[YSHEAR];
info_dialog_update (transform_info);
info_dialog_popup (transform_info);
}
static void
shear_x_mag_changed (GtkWidget *widget,
gpointer data)
{
GimpTool *tool;
GimpTransformTool *transform_tool;
gint value;
tool = GIMP_TOOL (data);
transform_tool = GIMP_TRANSFORM_TOOL (data);
value = GTK_ADJUSTMENT (widget)->value;
if (value != transform_tool->trans_info[XSHEAR])
{
gimp_draw_tool_pause (GIMP_DRAW_TOOL (tool));
transform_tool->trans_info[XSHEAR] = value;
shear_tool_recalc (transform_tool, tool->gdisp);
gimp_draw_tool_resume (GIMP_DRAW_TOOL (tool));
}
}
static void
shear_y_mag_changed (GtkWidget *widget,
gpointer data)
{
GimpTool *tool;
GimpTransformTool *transform_tool;
gint value;
tool = GIMP_TOOL (data);
transform_tool = GIMP_TRANSFORM_TOOL (data);
value = GTK_ADJUSTMENT (widget)->value;
if (value != transform_tool->trans_info[YSHEAR])
{
gimp_draw_tool_pause (GIMP_DRAW_TOOL (tool));
transform_tool->trans_info[YSHEAR] = value;
shear_tool_recalc (transform_tool, tool->gdisp);
gimp_draw_tool_resume (GIMP_DRAW_TOOL (tool));
}
}
static void
shear_tool_motion (GimpTransformTool *transform_tool,
GimpDisplay *gdisp)
{
gint diffx, diffy;
gint dir;
diffx = transform_tool->curx - transform_tool->lastx;
diffy = transform_tool->cury - transform_tool->lasty;
/* If we haven't yet decided on which way to control shearing
* decide using the maximum differential
*/
if (transform_tool->trans_info[HORZ_OR_VERT] == ORIENTATION_UNKNOWN)
{
if (abs (diffx) > MIN_MOVE || abs (diffy) > MIN_MOVE)
{
if (abs (diffx) > abs (diffy))
{
transform_tool->trans_info[HORZ_OR_VERT] = ORIENTATION_HORIZONTAL;
transform_tool->trans_info[ORIENTATION_VERTICAL] = 0.0;
}
else
{
transform_tool->trans_info[HORZ_OR_VERT] = ORIENTATION_VERTICAL;
transform_tool->trans_info[ORIENTATION_HORIZONTAL] = 0.0;
}
}
/* set the current coords to the last ones */
else
{
transform_tool->curx = transform_tool->lastx;
transform_tool->cury = transform_tool->lasty;
}
}
/* if the direction is known, keep track of the magnitude */
if (transform_tool->trans_info[HORZ_OR_VERT] != ORIENTATION_UNKNOWN)
{
dir = transform_tool->trans_info[HORZ_OR_VERT];
switch (transform_tool->function)
{
case TRANSFORM_HANDLE_1:
if (dir == ORIENTATION_HORIZONTAL)
transform_tool->trans_info[XSHEAR] -= diffx;
else
transform_tool->trans_info[YSHEAR] -= diffy;
break;
case TRANSFORM_HANDLE_2:
if (dir == ORIENTATION_HORIZONTAL)
transform_tool->trans_info[XSHEAR] -= diffx;
else
transform_tool->trans_info[YSHEAR] += diffy;
break;
case TRANSFORM_HANDLE_3:
if (dir == ORIENTATION_HORIZONTAL)
transform_tool->trans_info[XSHEAR] += diffx;
else
transform_tool->trans_info[YSHEAR] -= diffy;
break;
case TRANSFORM_HANDLE_4:
if (dir == ORIENTATION_HORIZONTAL)
transform_tool->trans_info[XSHEAR] += diffx;
else
transform_tool->trans_info[YSHEAR] += diffy;
break;
default:
break;
}
}
}
static void
shear_tool_recalc (GimpTransformTool *transform_tool,
GimpDisplay *gdisp)
{
gdouble amount;
if (transform_tool->trans_info[HORZ_OR_VERT] == ORIENTATION_HORIZONTAL)
amount = transform_tool->trans_info[XSHEAR];
else
amount = transform_tool->trans_info[YSHEAR];
gimp_drawable_transform_matrix_shear (transform_tool->x1,
transform_tool->y1,
transform_tool->x2,
transform_tool->y2,
transform_tool->trans_info[HORZ_OR_VERT],
amount,
transform_tool->transform);
/* transform the bounding box */
gimp_transform_tool_transform_bounding_box (transform_tool);
/* update the information dialog */
shear_info_update (transform_tool);
}
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