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gimp/app/tools/gimprotatetool.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 <gtk/gtk.h>
#include "libgimpmath/gimpmath.h"
#include "libgimpwidgets/gimpwidgets.h"
#include "core/core-types.h"
#include "libgimptool/gimptooltypes.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 "gimprotatetool.h"
#include "transform_options.h"
#include "libgimp/gimpintl.h"
/* index into trans_info array */
#define ANGLE 0
#define REAL_ANGLE 1
#define CENTER_X 2
#define CENTER_Y 3
#define EPSILON 0.018 /* ~ 1 degree */
#define FIFTEEN_DEG (G_PI / 12.0)
/* local function prototypes */
static void gimp_rotate_tool_class_init (GimpRotateToolClass *klass);
static void gimp_rotate_tool_init (GimpRotateTool *rotate_tool);
static TileManager * gimp_rotate_tool_transform (GimpTransformTool *tr_tool,
GimpDisplay *gdisp,
TransformState state);
static void rotate_tool_recalc (GimpTransformTool *tr_tool,
GimpDisplay *gdisp);
static void rotate_tool_motion (GimpTransformTool *tr_tool,
GimpDisplay *gdisp);
static void rotate_info_update (GimpTransformTool *tr_tool);
static void rotate_angle_changed (GtkWidget *entry,
gpointer data);
static void rotate_center_changed (GtkWidget *entry,
gpointer data);
/* variables local to this file */
static gdouble angle_val;
static gdouble center_vals[2];
/* needed for size update */
static GtkWidget *sizeentry = NULL;
static GimpTransformToolClass *parent_class = NULL;
/* public functions */
void
gimp_rotate_tool_register (GimpToolRegisterCallback callback,
Gimp *gimp)
{
(* callback) (GIMP_TYPE_ROTATE_TOOL,
transform_options_new,
FALSE,
"gimp-rotate-tool",
_("Rotate Tool"),
_("Rotate the layer or selection"),
N_("/Tools/Transform Tools/Rotate"), "<shift>R",
NULL, "tools/rotate.html",
GIMP_STOCK_TOOL_ROTATE,
gimp);
}
GType
gimp_rotate_tool_get_type (void)
{
static GType tool_type = 0;
if (! tool_type)
{
static const GTypeInfo tool_info =
{
sizeof (GimpRotateToolClass),
(GBaseInitFunc) NULL,
(GBaseFinalizeFunc) NULL,
(GClassInitFunc) gimp_rotate_tool_class_init,
NULL, /* class_finalize */
NULL, /* class_data */
sizeof (GimpRotateTool),
0, /* n_preallocs */
(GInstanceInitFunc) gimp_rotate_tool_init,
};
tool_type = g_type_register_static (GIMP_TYPE_TRANSFORM_TOOL,
"GimpRotateTool",
&tool_info, 0);
}
return tool_type;
}
/* private functions */
static void
gimp_rotate_tool_class_init (GimpRotateToolClass *klass)
{
GimpTransformToolClass *trans_class;
trans_class = GIMP_TRANSFORM_TOOL_CLASS (klass);
parent_class = g_type_class_peek_parent (klass);
trans_class->transform = gimp_rotate_tool_transform;
}
static void
gimp_rotate_tool_init (GimpRotateTool *rotate_tool)
{
GimpTool *tool;
tool = GIMP_TOOL (rotate_tool);
gimp_tool_control_set_scroll_lock (tool->control, TRUE);
gimp_tool_control_set_preserve (tool->control, FALSE);
gimp_tool_control_set_tool_cursor (tool->control, GIMP_ROTATE_TOOL_CURSOR);
}
static TileManager *
gimp_rotate_tool_transform (GimpTransformTool *transform_tool,
GimpDisplay *gdisp,
TransformState state)
{
switch (state)
{
case TRANSFORM_INIT:
angle_val = 0.0;
center_vals[0] = transform_tool->cx;
center_vals[1] = transform_tool->cy;
if (! transform_tool->info_dialog)
{
GtkWidget *widget;
GtkWidget *spinbutton2;
transform_tool->info_dialog =
info_dialog_new (_("Rotation Information"),
gimp_standard_help_func,
"tools/transform_rotate.html");
gimp_transform_tool_info_dialog_connect (transform_tool,
GIMP_STOCK_TOOL_ROTATE);
widget =
info_dialog_add_spinbutton (transform_tool->info_dialog, _("Angle:"),
&angle_val,
-180, 180, 1, 15, 1, 1, 2,
G_CALLBACK (rotate_angle_changed),
transform_tool);
gtk_spin_button_set_wrap (GTK_SPIN_BUTTON (widget), TRUE);
/* this looks strange (-180, 181), but it works */
widget = info_dialog_add_scale (transform_tool->info_dialog, "",
&angle_val,
-180, 181, 0.01, 0.1, 1, -1,
G_CALLBACK (rotate_angle_changed),
transform_tool);
gtk_widget_set_size_request (widget, 180, -1);
spinbutton2 =
info_dialog_add_spinbutton (transform_tool->info_dialog,
_("Center X:"),
NULL,
-1, 1, 1, 10, 1, 1, 2, NULL, NULL);
sizeentry =
info_dialog_add_sizeentry (transform_tool->info_dialog, _("Y:"),
center_vals, 1,
gdisp->gimage->unit, "%a",
TRUE, TRUE, FALSE,
GIMP_SIZE_ENTRY_UPDATE_SIZE,
G_CALLBACK (rotate_center_changed),
transform_tool);
gimp_size_entry_add_field (GIMP_SIZE_ENTRY (sizeentry),
GTK_SPIN_BUTTON (spinbutton2), NULL);
gtk_table_set_row_spacing (GTK_TABLE (transform_tool->info_dialog->info_table),
1, 6);
gtk_table_set_row_spacing (GTK_TABLE (transform_tool->info_dialog->info_table),
2, 0);
}
g_signal_handlers_block_by_func (G_OBJECT (sizeentry),
rotate_center_changed,
transform_tool);
gimp_size_entry_set_unit (GIMP_SIZE_ENTRY (sizeentry),
gdisp->gimage->unit);
if (gdisp->dot_for_dot)
gimp_size_entry_set_unit (GIMP_SIZE_ENTRY (sizeentry), GIMP_UNIT_PIXEL);
gimp_size_entry_set_resolution (GIMP_SIZE_ENTRY (sizeentry), 0,
gdisp->gimage->xresolution, FALSE);
gimp_size_entry_set_resolution (GIMP_SIZE_ENTRY (sizeentry), 1,
gdisp->gimage->yresolution, FALSE);
gimp_size_entry_set_refval_boundaries (GIMP_SIZE_ENTRY (sizeentry), 0,
-65536,
65536 + gdisp->gimage->width);
gimp_size_entry_set_refval_boundaries (GIMP_SIZE_ENTRY (sizeentry), 1,
-65536,
65536 + gdisp->gimage->height);
gimp_size_entry_set_size (GIMP_SIZE_ENTRY (sizeentry), 0,
transform_tool->x1, transform_tool->x2);
gimp_size_entry_set_size (GIMP_SIZE_ENTRY (sizeentry), 1,
transform_tool->y1, transform_tool->y2);
gimp_size_entry_set_refval (GIMP_SIZE_ENTRY (sizeentry), 0,
center_vals[0]);
gimp_size_entry_set_refval (GIMP_SIZE_ENTRY (sizeentry), 1,
center_vals[1]);
g_signal_handlers_unblock_by_func (G_OBJECT (sizeentry),
rotate_center_changed,
transform_tool);
gtk_widget_set_sensitive (transform_tool->info_dialog->shell, TRUE);
transform_tool->trans_info[ANGLE] = angle_val;
transform_tool->trans_info[REAL_ANGLE] = angle_val;
transform_tool->trans_info[CENTER_X] = center_vals[0];
transform_tool->trans_info[CENTER_Y] = center_vals[1];
break;
case TRANSFORM_MOTION:
rotate_tool_motion (transform_tool, gdisp);
rotate_tool_recalc (transform_tool, gdisp);
break;
case TRANSFORM_RECALC:
rotate_tool_recalc (transform_tool, gdisp);
break;
case TRANSFORM_FINISH:
return gimp_transform_tool_transform_tiles (transform_tool,
_("Rotating..."));
break;
}
return NULL;
}
static void
rotate_info_update (GimpTransformTool *transform_tool)
{
angle_val = gimp_rad_to_deg (transform_tool->trans_info[ANGLE]);
center_vals[0] = transform_tool->trans_info[CENTER_X];
center_vals[1] = transform_tool->trans_info[CENTER_Y];
info_dialog_update (transform_tool->info_dialog);
info_dialog_popup (transform_tool->info_dialog);
}
static void
rotate_angle_changed (GtkWidget *widget,
gpointer data)
{
GimpTool *tool;
GimpTransformTool *transform_tool;
gdouble value;
tool = GIMP_TOOL (data);
transform_tool = GIMP_TRANSFORM_TOOL (data);
value = gimp_deg_to_rad (GTK_ADJUSTMENT (widget)->value);
if (value != transform_tool->trans_info[ANGLE])
{
gimp_draw_tool_pause (GIMP_DRAW_TOOL (tool));
transform_tool->trans_info[ANGLE] = value;
rotate_tool_recalc (transform_tool, tool->gdisp);
gimp_draw_tool_resume (GIMP_DRAW_TOOL (tool));
}
}
static void
rotate_center_changed (GtkWidget *widget,
gpointer data)
{
GimpTool *tool;
GimpTransformTool *transform_tool;
gdouble cx;
gdouble cy;
tool = GIMP_TOOL (data);
transform_tool = GIMP_TRANSFORM_TOOL (data);
cx = gimp_size_entry_get_refval (GIMP_SIZE_ENTRY (widget), 0);
cy = gimp_size_entry_get_refval (GIMP_SIZE_ENTRY (widget), 1);
if ((cx != transform_tool->trans_info[CENTER_X]) ||
(cy != transform_tool->trans_info[CENTER_Y]))
{
gimp_draw_tool_pause (GIMP_DRAW_TOOL (tool));
transform_tool->trans_info[CENTER_X] = cx;
transform_tool->trans_info[CENTER_Y] = cy;
transform_tool->cx = cx;
transform_tool->cy = cy;
rotate_tool_recalc (transform_tool, tool->gdisp);
gimp_draw_tool_resume (GIMP_DRAW_TOOL (tool));
}
}
static void
rotate_tool_motion (GimpTransformTool *transform_tool,
GimpDisplay *gdisp)
{
TransformOptions *options;
gdouble angle1, angle2, angle;
gdouble cx, cy;
gdouble x1, y1, x2, y2;
if (transform_tool->function == TRANSFORM_HANDLE_CENTER)
{
transform_tool->trans_info[CENTER_X] = transform_tool->curx;
transform_tool->trans_info[CENTER_Y] = transform_tool->cury;
transform_tool->cx = transform_tool->curx;
transform_tool->cy = transform_tool->cury;
return;
}
options = (TransformOptions *) GIMP_TOOL (transform_tool)->tool_info->tool_options;
cx = transform_tool->trans_info[CENTER_X];
cy = transform_tool->trans_info[CENTER_Y];
x1 = transform_tool->curx - cx;
x2 = transform_tool->lastx - cx;
y1 = cy - transform_tool->cury;
y2 = cy - transform_tool->lasty;
/* find the first angle */
angle1 = atan2 (y1, x1);
/* find the angle */
angle2 = atan2 (y2, x2);
angle = angle2 - angle1;
if (angle > G_PI || angle < -G_PI)
angle = angle2 - ((angle1 < 0) ? 2.0 * G_PI + angle1 : angle1 - 2.0 * G_PI);
/* increment the transform tool's angle */
transform_tool->trans_info[REAL_ANGLE] += angle;
/* limit the angle to between 0 and 360 degrees */
if (transform_tool->trans_info[REAL_ANGLE] < - G_PI)
transform_tool->trans_info[REAL_ANGLE] =
2.0 * G_PI - transform_tool->trans_info[REAL_ANGLE];
else if (transform_tool->trans_info[REAL_ANGLE] > G_PI)
transform_tool->trans_info[REAL_ANGLE] =
transform_tool->trans_info[REAL_ANGLE] - 2.0 * G_PI;
/* constrain the angle to 15-degree multiples if ctrl is held down */
if (options->constrain_1)
{
transform_tool->trans_info[ANGLE] =
FIFTEEN_DEG * (int) ((transform_tool->trans_info[REAL_ANGLE] +
FIFTEEN_DEG / 2.0) /
FIFTEEN_DEG);
}
else
{
transform_tool->trans_info[ANGLE] = transform_tool->trans_info[REAL_ANGLE];
}
}
static void
rotate_tool_recalc (GimpTransformTool *transform_tool,
GimpDisplay *gdisp)
{
gdouble cx, cy;
cx = transform_tool->trans_info[CENTER_X];
cy = transform_tool->trans_info[CENTER_Y];
transform_tool->cx = cx;
transform_tool->cy = cy;
gimp_drawable_transform_matrix_rotate_center (transform_tool->cx,
transform_tool->cy,
transform_tool->trans_info[ANGLE],
transform_tool->transform);
/* transform the bounding box */
gimp_transform_tool_transform_bounding_box (transform_tool);
/* update the information dialog */
rotate_info_update (transform_tool);
}
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