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gimp/app/tools/rotate_tool.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 <math.h>
#include "appenv.h"
#include "drawable.h"
#include "gdisplay.h"
#include "gimage_mask.h"
#include "info_dialog.h"
#include "palette.h"
#include "rotate_tool.h"
#include "selection.h"
#include "tools.h"
#include "transform_core.h"
#include "transform_tool.h"
#include "undo.h"
#include "tile_manager_pvt.h"
#include "libgimp/gimpsizeentry.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)
/* variables local to this file */
static gdouble angle_val;
static gdouble center_vals[2];
/* needed for size update */
static GtkWidget *sizeentry;
/* forward function declarations */
static void * rotate_tool_recalc (Tool *, void *);
static void rotate_tool_motion (Tool *, void *);
static void rotate_info_update (Tool *);
/* callback functions for the info dialog sizeentries */
static void rotate_angle_changed (GtkWidget *entry, gpointer data);
static void rotate_center_changed (GtkWidget *entry, gpointer data);
void *
rotate_tool_transform (Tool *tool,
gpointer gdisp_ptr,
int state)
{
TransformCore *transform_core;
GDisplay *gdisp;
GtkWidget *widget;
GtkWidget *spinbutton2;
transform_core = (TransformCore *) tool->private;
gdisp = (GDisplay *) gdisp_ptr;
switch (state)
{
case INIT :
angle_val = 0.0;
center_vals[0] = transform_core->cx;
center_vals[1] = transform_core->cy;
if (!transform_info)
{
transform_info = info_dialog_new (_("Rotation Information"));
widget =
info_dialog_add_spinbutton (transform_info, _("Angle:"),
&angle_val,
-180, 180, 1, 15, 1, 1, 2,
(GtkSignalFunc) rotate_angle_changed,
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_info, "", &angle_val,
-180, 181, 0.01, 0.1, 1, -1,
(GtkSignalFunc) rotate_angle_changed,
tool);
gtk_widget_set_usize (widget, 180, 0);
spinbutton2 =
info_dialog_add_spinbutton (transform_info, _("Center X:"), NULL,
-1, 1, 1, 10, 1, 1, 2, NULL, NULL);
sizeentry =
info_dialog_add_sizeentry (transform_info, _("Y:"),
center_vals, 1,
gdisp->gimage->unit, "%a",
TRUE, TRUE, FALSE,
GIMP_SIZE_ENTRY_UPDATE_SIZE,
rotate_center_changed, tool);
gimp_size_entry_add_field (GIMP_SIZE_ENTRY (sizeentry),
GTK_SPIN_BUTTON (spinbutton2), NULL);
gtk_table_set_row_spacing (GTK_TABLE (transform_info->info_table),
1, 6);
gtk_table_set_row_spacing (GTK_TABLE (transform_info->info_table),
2, 0);
}
gtk_signal_handler_block_by_data (GTK_OBJECT (sizeentry), 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), 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_core->x1, transform_core->x2);
gimp_size_entry_set_size (GIMP_SIZE_ENTRY (sizeentry), 1,
transform_core->y1, transform_core->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]);
gtk_widget_set_sensitive (transform_info->shell, TRUE);
gtk_signal_handler_unblock_by_data (GTK_OBJECT (sizeentry), tool);
transform_core->trans_info[ANGLE] = angle_val;
transform_core->trans_info[REAL_ANGLE] = angle_val;
transform_core->trans_info[CENTER_X] = center_vals[0];
transform_core->trans_info[CENTER_Y] = center_vals[1];
return NULL;
break;
case MOTION :
rotate_tool_motion (tool, gdisp_ptr);
return rotate_tool_recalc (tool, gdisp_ptr);
break;
case RECALC :
return rotate_tool_recalc (tool, gdisp_ptr);
break;
case FINISH :
gtk_widget_set_sensitive (GTK_WIDGET (transform_info->shell), FALSE);
return rotate_tool_rotate (gdisp->gimage,
gimage_active_drawable (gdisp->gimage),
gdisp,
transform_core->trans_info[ANGLE],
transform_core->original,
transform_tool_smoothing (),
transform_core->transform);
break;
}
return NULL;
}
Tool *
tools_new_rotate_tool ()
{
Tool * tool;
TransformCore * private;
tool = transform_core_new (ROTATE, INTERACTIVE);
private = tool->private;
/* set the rotation specific transformation attributes */
private->trans_func = rotate_tool_transform;
private->trans_info[ANGLE] = 0.0;
private->trans_info[REAL_ANGLE] = 0.0;
private->trans_info[CENTER_X] = 0.0;
private->trans_info[CENTER_Y] = 0.0;
/* assemble the transformation matrix */
gimp_matrix_identity (private->transform);
return tool;
}
void
tools_free_rotate_tool (Tool *tool)
{
transform_core_free (tool);
}
static void
rotate_info_update (Tool *tool)
{
TransformCore * transform_core;
transform_core = (TransformCore *) tool->private;
angle_val = (transform_core->trans_info[ANGLE] * 180.0) / G_PI;
center_vals[0] = transform_core->cx;
center_vals[1] = transform_core->cy;
info_dialog_update (transform_info);
info_dialog_popup (transform_info);
}
static void
rotate_angle_changed (GtkWidget *w,
gpointer data)
{
Tool *tool;
GDisplay *gdisp;
TransformCore *transform_core;
double value;
tool = (Tool *) data;
if (tool)
{
gdisp = (GDisplay *) tool->gdisp_ptr;
transform_core = (TransformCore *) tool->private;
value = GTK_ADJUSTMENT (w)->value * G_PI / 180.0;
if (value != transform_core->trans_info[ANGLE])
{
draw_core_pause (transform_core->core, tool);
transform_core->trans_info[ANGLE] = value;
rotate_tool_recalc (tool, gdisp);
draw_core_resume (transform_core->core, tool);
}
}
}
static void
rotate_center_changed (GtkWidget *w,
gpointer data)
{
Tool *tool;
GDisplay *gdisp;
TransformCore *transform_core;
int cx;
int cy;
tool = (Tool *) data;
if (tool)
{
gdisp = (GDisplay *) tool->gdisp_ptr;
transform_core = (TransformCore *) tool->private;
cx = (int) (gimp_size_entry_get_refval (GIMP_SIZE_ENTRY (w), 0) + 0.5);
cy = (int) (gimp_size_entry_get_refval (GIMP_SIZE_ENTRY (w), 1) + 0.5);
if ((cx != transform_core->cx) ||
(cy != transform_core->cy))
{
draw_core_pause (transform_core->core, tool);
transform_core->cx = cx;
transform_core->cy = cy;
rotate_tool_recalc (tool, gdisp);
draw_core_resume (transform_core->core, tool);
}
}
}
static void
rotate_tool_motion (Tool *tool,
void *gdisp_ptr)
{
TransformCore * transform_core;
double angle1, angle2, angle;
double cx, cy;
double x1, y1, x2, y2;
transform_core = (TransformCore *) tool->private;
if (transform_core->function == HANDLE_CENTER)
{
transform_core->cx = transform_core->curx;
transform_core->cy = transform_core->cury;
return;
}
cx = transform_core->cx;
cy = transform_core->cy;
x1 = transform_core->curx - cx;
x2 = transform_core->lastx - cx;
y1 = cy - transform_core->cury;
y2 = cy - transform_core->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*G_PI + angle1 : angle1 - 2*G_PI);
/* increment the transform tool's angle */
transform_core->trans_info[REAL_ANGLE] += angle;
/* limit the angle to between 0 and 360 degrees */
if (transform_core->trans_info[REAL_ANGLE] < - G_PI)
transform_core->trans_info[REAL_ANGLE] =
2 * G_PI - transform_core->trans_info[REAL_ANGLE];
else if (transform_core->trans_info[REAL_ANGLE] > G_PI)
transform_core->trans_info[REAL_ANGLE] =
transform_core->trans_info[REAL_ANGLE] - 2 * G_PI;
/* constrain the angle to 15-degree multiples if ctrl is held down */
if (transform_core->state & GDK_CONTROL_MASK)
transform_core->trans_info[ANGLE] =
FIFTEEN_DEG * (int) ((transform_core->trans_info[REAL_ANGLE] +
FIFTEEN_DEG / 2.0) /
FIFTEEN_DEG);
else
transform_core->trans_info[ANGLE] = transform_core->trans_info[REAL_ANGLE];
}
static void *
rotate_tool_recalc (Tool *tool,
void *gdisp_ptr)
{
TransformCore * transform_core;
GDisplay * gdisp;
double cx, cy;
gdisp = (GDisplay *) tool->gdisp_ptr;
transform_core = (TransformCore *) tool->private;
cx = transform_core->cx;
cy = transform_core->cy;
/* assemble the transformation matrix */
gimp_matrix_identity (transform_core->transform);
gimp_matrix_translate (transform_core->transform, -cx, -cy);
gimp_matrix_rotate (transform_core->transform,
transform_core->trans_info[ANGLE]);
gimp_matrix_translate (transform_core->transform, +cx, +cy);
/* transform the bounding box */
transform_bounding_box (tool);
/* update the information dialog */
rotate_info_update (tool);
return (void *) 1;
}
/* This procedure returns a valid pointer to a new selection if the
* requested angle is a multiple of 90 degrees...
*/
void *
rotate_tool_rotate (GImage *gimage,
GimpDrawable *drawable,
GDisplay *gdisp,
double angle,
TileManager *float_tiles,
int interpolation,
GimpMatrix matrix)
{
void *ret;
gimp_progress *progress;
progress = progress_start (gdisp, _("Rotating..."), FALSE, NULL, NULL);
ret = transform_core_do (gimage, drawable, float_tiles,
interpolation, matrix,
progress? progress_update_and_flush:NULL, progress);
if (progress)
progress_end (progress);
return ret;
}
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