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gimp/app/shear_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 "config.h"
#include <gtk/gtk.h>
#include "apptypes.h"
#include "appenv.h"
#include "draw_core.h"
#include "drawable.h"
#include "gdisplay.h"
#include "gimage_mask.h"
#include "gimpimage.h"
#include "gimpui.h"
#include "gimpprogress.h"
#include "info_dialog.h"
#include "shear_tool.h"
#include "selection.h"
#include "tools.h"
#include "tool_options.h"
#include "transform_core.h"
#include "transform_tool.h"
#include "undo.h"
#include "tile_manager_pvt.h"
#include "libgimp/gimpmath.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
/* variables local to this file */
static gdouble xshear_val;
static gdouble yshear_val;
/* forward function declarations */
static void shear_tool_recalc (Tool *, void *);
static void shear_tool_motion (Tool *, void *);
static void shear_info_update (Tool *);
/* Info dialog callback funtions */
static void shear_x_mag_changed (GtkWidget *widget, gpointer data);
static void shear_y_mag_changed (GtkWidget *widget, gpointer data);
TileManager *
shear_tool_transform (Tool *tool,
gpointer gdisp_ptr,
TransformState state)
{
TransformCore *transform_core;
GDisplay *gdisp;
transform_core = (TransformCore *) tool->private;
gdisp = (GDisplay *) gdisp_ptr;
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,
shear_x_mag_changed, tool);
info_dialog_add_spinbutton (transform_info,
_("Y:"),
&yshear_val,
-65536, 65536, 1, 15, 1, 1, 0,
shear_y_mag_changed, tool);
}
gtk_widget_set_sensitive (GTK_WIDGET (transform_info->shell), TRUE);
transform_core->trans_info[HORZ_OR_VERT] = ORIENTATION_UNKNOWN;
transform_core->trans_info[XSHEAR] = 0.0;
transform_core->trans_info[YSHEAR] = 0.0;
return NULL;
break;
case TRANSFORM_MOTION:
shear_tool_motion (tool, gdisp_ptr);
shear_tool_recalc (tool, gdisp_ptr);
break;
case TRANSFORM_RECALC:
shear_tool_recalc (tool, gdisp_ptr);
break;
case TRANSFORM_FINISH:
gtk_widget_set_sensitive (GTK_WIDGET (transform_info->shell), FALSE);
return shear_tool_shear (gdisp->gimage,
gimp_image_active_drawable (gdisp->gimage),
gdisp,
transform_core->original,
transform_tool_smoothing (),
transform_core->transform);
break;
}
return NULL;
}
Tool *
tools_new_shear_tool (void)
{
Tool *tool;
TransformCore *private;
tool = transform_core_new (SHEAR, TRUE);
private = tool->private;
/* set the rotation specific transformation attributes */
private->trans_func = shear_tool_transform;
/* assemble the transformation matrix */
gimp_matrix3_identity (private->transform);
return tool;
}
void
tools_free_shear_tool (Tool *tool)
{
transform_core_free (tool);
}
static void
shear_info_update (Tool *tool)
{
TransformCore *transform_core;
transform_core = (TransformCore *) tool->private;
xshear_val = transform_core->trans_info[XSHEAR];
yshear_val = transform_core->trans_info[YSHEAR];
info_dialog_update (transform_info);
info_dialog_popup (transform_info);
}
static void
shear_x_mag_changed (GtkWidget *widget,
gpointer data)
{
Tool *tool;
TransformCore *transform_core;
GDisplay *gdisp;
gint value;
tool = (Tool *) data;
if (tool)
{
gdisp = (GDisplay *) tool->gdisp_ptr;
transform_core = (TransformCore *) tool->private;
value = GTK_ADJUSTMENT (widget)->value;
if (value != transform_core->trans_info[XSHEAR])
{
draw_core_pause (transform_core->core, tool);
transform_core->trans_info[XSHEAR] = value;
shear_tool_recalc (tool, gdisp);
draw_core_resume (transform_core->core, tool);
}
}
}
static void
shear_y_mag_changed (GtkWidget *widget,
gpointer data)
{
Tool *tool;
TransformCore *transform_core;
GDisplay *gdisp;
gint value;
tool = (Tool *) data;
if (tool)
{
gdisp = (GDisplay *) tool->gdisp_ptr;
transform_core = (TransformCore *) tool->private;
value = GTK_ADJUSTMENT (widget)->value;
if (value != transform_core->trans_info[YSHEAR])
{
draw_core_pause (transform_core->core, tool);
transform_core->trans_info[YSHEAR] = value;
shear_tool_recalc (tool, gdisp);
draw_core_resume (transform_core->core, tool);
}
}
}
static void
shear_tool_motion (Tool *tool,
void *gdisp_ptr)
{
TransformCore *transform_core;
gint diffx, diffy;
gint dir;
transform_core = (TransformCore *) tool->private;
diffx = transform_core->curx - transform_core->lastx;
diffy = transform_core->cury - transform_core->lasty;
/* If we haven't yet decided on which way to control shearing
* decide using the maximum differential
*/
if (transform_core->trans_info[HORZ_OR_VERT] == ORIENTATION_UNKNOWN)
{
if (abs (diffx) > MIN_MOVE || abs (diffy) > MIN_MOVE)
{
if (abs (diffx) > abs (diffy))
{
transform_core->trans_info[HORZ_OR_VERT] = ORIENTATION_HORIZONTAL;
transform_core->trans_info[ORIENTATION_VERTICAL] = 0.0;
}
else
{
transform_core->trans_info[HORZ_OR_VERT] = ORIENTATION_VERTICAL;
transform_core->trans_info[ORIENTATION_HORIZONTAL] = 0.0;
}
}
/* set the current coords to the last ones */
else
{
transform_core->curx = transform_core->lastx;
transform_core->cury = transform_core->lasty;
}
}
/* if the direction is known, keep track of the magnitude */
if (transform_core->trans_info[HORZ_OR_VERT] != ORIENTATION_UNKNOWN)
{
dir = transform_core->trans_info[HORZ_OR_VERT];
switch (transform_core->function)
{
case TRANSFORM_HANDLE_1:
if (dir == ORIENTATION_HORIZONTAL)
transform_core->trans_info[XSHEAR] -= diffx;
else
transform_core->trans_info[YSHEAR] -= diffy;
break;
case TRANSFORM_HANDLE_2:
if (dir == ORIENTATION_HORIZONTAL)
transform_core->trans_info[XSHEAR] -= diffx;
else
transform_core->trans_info[YSHEAR] += diffy;
break;
case TRANSFORM_HANDLE_3:
if (dir == ORIENTATION_HORIZONTAL)
transform_core->trans_info[XSHEAR] += diffx;
else
transform_core->trans_info[YSHEAR] -= diffy;
break;
case TRANSFORM_HANDLE_4:
if (dir == ORIENTATION_HORIZONTAL)
transform_core->trans_info[XSHEAR] += diffx;
else
transform_core->trans_info[YSHEAR] += diffy;
break;
default:
break;
}
}
}
static void
shear_tool_recalc (Tool *tool,
void *gdisp_ptr)
{
TransformCore *transform_core;
GDisplay *gdisp;
gfloat width, height;
gfloat cx, cy;
gdisp = (GDisplay *) tool->gdisp_ptr;
transform_core = (TransformCore *) tool->private;
cx = (transform_core->x1 + transform_core->x2) / 2.0;
cy = (transform_core->y1 + transform_core->y2) / 2.0;
width = transform_core->x2 - transform_core->x1;
height = transform_core->y2 - transform_core->y1;
if (width == 0)
width = 1;
if (height == 0)
height = 1;
/* assemble the transformation matrix */
gimp_matrix3_identity (transform_core->transform);
gimp_matrix3_translate (transform_core->transform, -cx, -cy);
/* shear matrix */
if (transform_core->trans_info[HORZ_OR_VERT] == ORIENTATION_HORIZONTAL)
gimp_matrix3_xshear (transform_core->transform,
(float) transform_core->trans_info [XSHEAR] / height);
else
gimp_matrix3_yshear (transform_core->transform,
(float) transform_core->trans_info [YSHEAR] / width);
gimp_matrix3_translate (transform_core->transform, +cx, +cy);
/* transform the bounding box */
transform_core_transform_bounding_box (tool);
/* update the information dialog */
shear_info_update (tool);
}
TileManager *
shear_tool_shear (GimpImage *gimage,
GimpDrawable *drawable,
GDisplay *gdisp,
TileManager *float_tiles,
gboolean interpolation,
GimpMatrix3 matrix)
{
gimp_progress *progress;
TileManager *ret;
progress = progress_start (gdisp, _("Shearing..."), FALSE, NULL, NULL);
ret = transform_core_do (gimage, drawable, float_tiles,
interpolation, matrix,
progress ? progress_update_and_flush :
(progress_func_t) NULL,
progress);
if (progress)
progress_end (progress);
return ret;
}
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