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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 <glib.h>
-
- #include "apptypes.h"
-
- #include "appenv.h"
- #include "drawable.h"
- #include "gdisplay.h"
- #include "gimage_mask.h"
- #include "info_dialog.h"
- #include "perspective_tool.h"
- #include "selection.h"
- #include "transform_tool.h"
- #include "undo.h"
-
- #include "libgimp/gimpintl.h"
-
- #include "tile_manager_pvt.h"
-
-
- /* storage for information dialog fields */
- static gchar matrix_row_buf [3][MAX_INFO_BUF];
-
- /* forward function declarations */
- static void perspective_tool_recalc (Tool *, void *);
- static void perspective_tool_motion (Tool *, void *);
- static void perspective_info_update (Tool *);
-
- TileManager *
- perspective_tool_transform (Tool *tool,
- gpointer gdisp_ptr,
- TransformState state)
- {
- GDisplay *gdisp;
- TransformCore *transform_core;
-
- gdisp = (GDisplay *) gdisp_ptr;
- transform_core = (TransformCore *) tool->private;
-
- switch (state)
- {
- case 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_core->trans_info [X0] = (double) transform_core->x1;
- transform_core->trans_info [Y0] = (double) transform_core->y1;
- transform_core->trans_info [X1] = (double) transform_core->x2;
- transform_core->trans_info [Y1] = (double) transform_core->y1;
- transform_core->trans_info [X2] = (double) transform_core->x1;
- transform_core->trans_info [Y2] = (double) transform_core->y2;
- transform_core->trans_info [X3] = (double) transform_core->x2;
- transform_core->trans_info [Y3] = (double) transform_core->y2;
-
- return NULL;
- break;
-
- case MOTION:
- perspective_tool_motion (tool, gdisp_ptr);
- perspective_tool_recalc (tool, gdisp_ptr);
- break;
-
- case RECALC:
- perspective_tool_recalc (tool, gdisp_ptr);
- break;
-
- case FINISH:
- /* Let the transform core handle the inverse mapping */
- gtk_widget_set_sensitive (GTK_WIDGET (transform_info->shell), FALSE);
- return
- perspective_tool_perspective (gdisp->gimage,
- gimage_active_drawable (gdisp->gimage),
- gdisp,
- transform_core->original,
- transform_tool_smoothing (),
- transform_core->transform);
- break;
- }
-
- return NULL;
- }
-
- Tool *
- tools_new_perspective_tool (void)
- {
- Tool *tool;
- TransformCore *private;
-
- tool = transform_core_new (PERSPECTIVE, TRUE);
-
- private = tool->private;
-
- /* set the rotation specific transformation attributes */
- private->trans_func = perspective_tool_transform;
- private->trans_info[X0] = 0;
- private->trans_info[Y0] = 0;
- private->trans_info[X1] = 0;
- private->trans_info[Y1] = 0;
- private->trans_info[X2] = 0;
- private->trans_info[Y2] = 0;
- private->trans_info[X3] = 0;
- private->trans_info[Y3] = 0;
-
- /* assemble the transformation matrix */
- gimp_matrix3_identity (private->transform);
-
- return tool;
- }
-
- void
- tools_free_perspective_tool (Tool *tool)
- {
- transform_core_free (tool);
- }
-
- static void
- perspective_info_update (Tool *tool)
- {
- TransformCore *transform_core;
- gint i;
-
- transform_core = (TransformCore *) tool->private;
-
- 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_core->transform[i][j]);
- }
- }
-
- info_dialog_update (transform_info);
- info_dialog_popup (transform_info);
-
- return;
- }
-
- static void
- perspective_tool_motion (Tool *tool,
- void *gdisp_ptr)
- {
- GDisplay *gdisp;
- TransformCore *transform_core;
- gint diff_x, diff_y;
-
- gdisp = (GDisplay *) gdisp_ptr;
- transform_core = (TransformCore *) tool->private;
-
- diff_x = transform_core->curx - transform_core->lastx;
- diff_y = transform_core->cury - transform_core->lasty;
-
- switch (transform_core->function)
- {
- case HANDLE_1:
- transform_core->trans_info [X0] += diff_x;
- transform_core->trans_info [Y0] += diff_y;
- break;
- case HANDLE_2:
- transform_core->trans_info [X1] += diff_x;
- transform_core->trans_info [Y1] += diff_y;
- break;
- case HANDLE_3:
- transform_core->trans_info [X2] += diff_x;
- transform_core->trans_info [Y2] += diff_y;
- break;
- case HANDLE_4:
- transform_core->trans_info [X3] += diff_x;
- transform_core->trans_info [Y3] += diff_y;
- break;
- default:
- break;
- }
- }
-
- static void
- perspective_tool_recalc (Tool *tool,
- void *gdisp_ptr)
- {
- TransformCore *transform_core;
- GDisplay *gdisp;
- GimpMatrix3 m;
- gdouble cx, cy;
- gdouble scalex, scaley;
-
- gdisp = (GDisplay *) tool->gdisp_ptr;
- transform_core = (TransformCore *) tool->private;
-
- /* determine the perspective transform that maps from
- * the unit cube to the trans_info coordinates
- */
- perspective_find_transform (transform_core->trans_info, m);
-
- cx = transform_core->x1;
- cy = transform_core->y1;
- scalex = 1.0;
- scaley = 1.0;
-
- if (transform_core->x2 - transform_core->x1)
- scalex = 1.0 / (transform_core->x2 - transform_core->x1);
- if (transform_core->y2 - transform_core->y1)
- scaley = 1.0 / (transform_core->y2 - transform_core->y1);
-
- /* assemble the transformation matrix */
- gimp_matrix3_identity (transform_core->transform);
- gimp_matrix3_translate (transform_core->transform, -cx, -cy);
- gimp_matrix3_scale (transform_core->transform, scalex, scaley);
- gimp_matrix3_mult (m, transform_core->transform);
-
- /* transform the bounding box */
- transform_core_transform_bounding_box (tool);
-
- /* update the information dialog */
- perspective_info_update (tool);
- }
-
- void
- perspective_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;
- }
-
- TileManager *
- perspective_tool_perspective (GImage *gimage,
- GimpDrawable *drawable,
- GDisplay *gdisp,
- TileManager *float_tiles,
- gboolean interpolation,
- GimpMatrix3 matrix)
- {
- gimp_progress *progress;
- TileManager *ret;
-
- progress = progress_start (gdisp, _("Perspective..."), 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;
- }
-