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gimp/app/tools/gimpperspectivetool.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 "tools-types.h"
#include "gui/gui-types.h"
#include "core/gimpimage.h"
#include "gui/info-dialog.h"
#include "display/gimpdisplay.h"
#include "gimpperspectivetool.h"
#include "tool_manager.h"
#include "tool_options.h"
#include "transform_options.h"
#include "gimpprogress.h"
#include "undo.h"
#include "libgimp/gimpintl.h"
/* forward function declarations */
static void gimp_perspective_tool_class_init (GimpPerspectiveToolClass *klass);
static void gimp_perspective_tool_init (GimpPerspectiveTool *perspective_tool);
static TileManager * gimp_perspective_tool_transform (GimpTransformTool *transform_tool,
GDisplay *gdisp,
TransformState state);
static void perspective_tool_recalc (GimpTool *tool,
GDisplay *gdisp);
static void perspective_tool_motion (GimpTool *tool,
GDisplay *gdisp);
static void perspective_info_update (GimpTool *tool);
/* storage for information dialog fields */
static gchar matrix_row_buf [3][MAX_INFO_BUF];
static GimpTransformToolClass *parent_class = NULL;
static TransformOptions *perspective_options = NULL;
/* public functions */
void
gimp_perspective_tool_register (Gimp *gimp)
{
tool_manager_register_tool (gimp,
GIMP_TYPE_PERSPECTIVE_TOOL,
FALSE,
"gimp:perspective_tool",
_("Perspective Tool"),
_("Change perspective of the layer or selection"),
N_("/Tools/Transform Tools/Perspective"), "<shift>P",
NULL, "tools/perspective.html",
GIMP_STOCK_TOOL_PERSPECTIVE);
}
GType
gimp_perspective_tool_get_type (void)
{
static GType tool_type = 0;
if (! tool_type)
{
static const GTypeInfo tool_info =
{
sizeof (GimpPerspectiveToolClass),
(GBaseInitFunc) NULL,
(GBaseFinalizeFunc) NULL,
(GClassInitFunc) gimp_perspective_tool_class_init,
NULL, /* class_finalize */
NULL, /* class_data */
sizeof (GimpPerspectiveTool),
0, /* n_preallocs */
(GInstanceInitFunc) gimp_perspective_tool_init,
};
tool_type = g_type_register_static (GIMP_TYPE_TRANSFORM_TOOL,
"GimpPerspectiveTool",
&tool_info, 0);
}
return tool_type;
}
static void
gimp_perspective_tool_class_init (GimpPerspectiveToolClass *klass)
{
GimpTransformToolClass *trans_class;
trans_class = GIMP_TRANSFORM_TOOL_CLASS (klass);
parent_class = g_type_class_peek_parent (klass);
trans_class->transform = gimp_perspective_tool_transform;
}
static void
gimp_perspective_tool_init (GimpPerspectiveTool *perspective_tool)
{
GimpTool *tool;
GimpTransformTool *tr_tool;
tool = GIMP_TOOL (perspective_tool);
tr_tool = GIMP_TRANSFORM_TOOL (perspective_tool);
if (! perspective_options)
{
perspective_options = transform_options_new (GIMP_TYPE_PERSPECTIVE_TOOL,
transform_options_reset);
tool_manager_register_tool_options (GIMP_TYPE_PERSPECTIVE_TOOL,
(GimpToolOptions *) perspective_options);
}
tool->tool_cursor = GIMP_PERSPECTIVE_TOOL_CURSOR;
tr_tool->trans_info[X0] = 0;
tr_tool->trans_info[Y0] = 0;
tr_tool->trans_info[X1] = 0;
tr_tool->trans_info[Y1] = 0;
tr_tool->trans_info[X2] = 0;
tr_tool->trans_info[Y2] = 0;
tr_tool->trans_info[X3] = 0;
tr_tool->trans_info[Y3] = 0;
/* assemble the transformation matrix */
gimp_matrix3_identity (tr_tool->transform);
}
TileManager *
gimp_perspective_tool_perspective (GimpImage *gimage,
GimpDrawable *drawable,
GDisplay *gdisp,
TileManager *float_tiles,
gboolean interpolation,
GimpMatrix3 matrix)
{
GimpProgress *progress;
TileManager *ret;
progress = progress_start (gdisp, _("Perspective..."), FALSE, NULL, NULL);
ret = gimp_transform_tool_do (gimage, drawable, float_tiles,
interpolation, matrix,
progress ? progress_update_and_flush :
(GimpProgressFunc) NULL,
progress);
if (progress)
progress_end (progress);
return ret;
}
void
gimp_perspective_tool_find_transform (gdouble *coords,
GimpMatrix3 matrix)
{
gdouble dx1, dx2, dx3, dy1, dy2, dy3;
gdouble det1, det2;
dx1 = coords[X1] - coords[X3];
dx2 = coords[X2] - coords[X3];
dx3 = coords[X0] - coords[X1] + coords[X3] - coords[X2];
dy1 = coords[Y1] - coords[Y3];
dy2 = coords[Y2] - coords[Y3];
dy3 = coords[Y0] - coords[Y1] + coords[Y3] - coords[Y2];
/* Is the mapping affine? */
if ((dx3 == 0.0) && (dy3 == 0.0))
{
matrix[0][0] = coords[X1] - coords[X0];
matrix[0][1] = coords[X3] - coords[X1];
matrix[0][2] = coords[X0];
matrix[1][0] = coords[Y1] - coords[Y0];
matrix[1][1] = coords[Y3] - coords[Y1];
matrix[1][2] = coords[Y0];
matrix[2][0] = 0.0;
matrix[2][1] = 0.0;
}
else
{
det1 = dx3 * dy2 - dy3 * dx2;
det2 = dx1 * dy2 - dy1 * dx2;
matrix[2][0] = det1 / det2;
det1 = dx1 * dy3 - dy1 * dx3;
det2 = dx1 * dy2 - dy1 * dx2;
matrix[2][1] = det1 / det2;
matrix[0][0] = coords[X1] - coords[X0] + matrix[2][0] * coords[X1];
matrix[0][1] = coords[X2] - coords[X0] + matrix[2][1] * coords[X2];
matrix[0][2] = coords[X0];
matrix[1][0] = coords[Y1] - coords[Y0] + matrix[2][0] * coords[Y1];
matrix[1][1] = coords[Y2] - coords[Y0] + matrix[2][1] * coords[Y2];
matrix[1][2] = coords[Y0];
}
matrix[2][2] = 1.0;
}
static TileManager *
gimp_perspective_tool_transform (GimpTransformTool *transform_tool,
GDisplay *gdisp,
TransformState state)
{
GimpTool *tool;
tool = GIMP_TOOL (transform_tool);
switch (state)
{
case TRANSFORM_INIT:
if (!transform_info)
{
transform_info =
info_dialog_new (_("Perspective Transform Information"),
gimp_standard_help_func,
"tools/transform_perspective.html");
info_dialog_add_label (transform_info, _("Matrix:"),
matrix_row_buf[0]);
info_dialog_add_label (transform_info, "", matrix_row_buf[1]);
info_dialog_add_label (transform_info, "", matrix_row_buf[2]);
}
gtk_widget_set_sensitive (GTK_WIDGET (transform_info->shell), TRUE);
transform_tool->trans_info [X0] = (double) transform_tool->x1;
transform_tool->trans_info [Y0] = (double) transform_tool->y1;
transform_tool->trans_info [X1] = (double) transform_tool->x2;
transform_tool->trans_info [Y1] = (double) transform_tool->y1;
transform_tool->trans_info [X2] = (double) transform_tool->x1;
transform_tool->trans_info [Y2] = (double) transform_tool->y2;
transform_tool->trans_info [X3] = (double) transform_tool->x2;
transform_tool->trans_info [Y3] = (double) transform_tool->y2;
return NULL;
break;
case TRANSFORM_MOTION:
perspective_tool_motion (tool, gdisp);
perspective_tool_recalc (tool, gdisp);
break;
case TRANSFORM_RECALC:
perspective_tool_recalc (tool, gdisp);
break;
case TRANSFORM_FINISH:
/* Let the transform tool handle the inverse mapping */
gtk_widget_set_sensitive (GTK_WIDGET (transform_info->shell), FALSE);
return
gimp_perspective_tool_perspective (gdisp->gimage,
gimp_image_active_drawable (gdisp->gimage),
gdisp,
transform_tool->original,
gimp_transform_tool_smoothing (),
transform_tool->transform);
break;
}
return NULL;
}
static void
perspective_info_update (GimpTool *tool)
{
GimpTransformTool *transform_tool;
gint i;
transform_tool = GIMP_TRANSFORM_TOOL (tool);
for (i = 0; i < 3; i++)
{
gchar *p = matrix_row_buf[i];
gint j;
for (j = 0; j < 3; j++)
{
p += g_snprintf (p, MAX_INFO_BUF - (p - matrix_row_buf[i]),
"%10.3g", transform_tool->transform[i][j]);
}
}
info_dialog_update (transform_info);
info_dialog_popup (transform_info);
return;
}
static void
perspective_tool_motion (GimpTool *tool,
GDisplay *gdisp)
{
GimpTransformTool *transform_tool;
gint diff_x, diff_y;
transform_tool = GIMP_TRANSFORM_TOOL (tool);
diff_x = transform_tool->curx - transform_tool->lastx;
diff_y = transform_tool->cury - transform_tool->lasty;
switch (transform_tool->function)
{
case TRANSFORM_HANDLE_1:
transform_tool->trans_info [X0] += diff_x;
transform_tool->trans_info [Y0] += diff_y;
break;
case TRANSFORM_HANDLE_2:
transform_tool->trans_info [X1] += diff_x;
transform_tool->trans_info [Y1] += diff_y;
break;
case TRANSFORM_HANDLE_3:
transform_tool->trans_info [X2] += diff_x;
transform_tool->trans_info [Y2] += diff_y;
break;
case TRANSFORM_HANDLE_4:
transform_tool->trans_info [X3] += diff_x;
transform_tool->trans_info [Y3] += diff_y;
break;
default:
break;
}
}
static void
perspective_tool_recalc (GimpTool *tool,
GDisplay *gdisp)
{
GimpTransformTool *transform_tool;
GimpMatrix3 m;
gdouble cx, cy;
gdouble scalex, scaley;
transform_tool = GIMP_TRANSFORM_TOOL (tool);
/* determine the perspective transform that maps from
* the unit cube to the trans_info coordinates
*/
gimp_perspective_tool_find_transform (transform_tool->trans_info, m);
cx = transform_tool->x1;
cy = transform_tool->y1;
scalex = 1.0;
scaley = 1.0;
if (transform_tool->x2 - transform_tool->x1)
scalex = 1.0 / (transform_tool->x2 - transform_tool->x1);
if (transform_tool->y2 - transform_tool->y1)
scaley = 1.0 / (transform_tool->y2 - transform_tool->y1);
/* assemble the transformation matrix */
gimp_matrix3_identity (transform_tool->transform);
gimp_matrix3_translate (transform_tool->transform, -cx, -cy);
gimp_matrix3_scale (transform_tool->transform, scalex, scaley);
gimp_matrix3_mult (m, transform_tool->transform);
/* transform the bounding box */
gimp_transform_tool_transform_bounding_box (transform_tool);
/* update the information dialog */
perspective_info_update (tool);
}
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