mirror of https://github.com/GNOME/gimp.git
367 lines
9.1 KiB
C
367 lines
9.1 KiB
C
/* The GIMP -- an image manipulation program
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* Copyright (C) 1995 Spencer Kimball and Peter Mattis
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <math.h>
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#include "appenv.h"
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#include "drawable.h"
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#include "gdisplay.h"
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#include "gimage_mask.h"
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#include "info_dialog.h"
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#include "shear_tool.h"
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#include "selection.h"
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#include "tools.h"
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#include "transform_core.h"
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#include "transform_tool.h"
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#include "undo.h"
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#include "tile_manager_pvt.h"
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#include "libgimp/gimpintl.h"
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/* index into trans_info array */
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#define HORZ_OR_VERT 0
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#define XSHEAR 1
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#define YSHEAR 2
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/* the minimum movement before direction of shear can be determined (pixels) */
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#define MIN_MOVE 5
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/* variables local to this file */
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static gint direction_unknown;
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static gdouble xshear_val;
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static gdouble yshear_val;
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/* forward function declarations */
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static void * shear_tool_recalc (Tool *, void *);
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static void shear_tool_motion (Tool *, void *);
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static void shear_info_update (Tool *);
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/* Info dialog callback funtions */
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static void shear_x_mag_changed (GtkWidget *, gpointer);
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static void shear_y_mag_changed (GtkWidget *, gpointer);
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void *
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shear_tool_transform (Tool *tool,
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gpointer gdisp_ptr,
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int state)
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{
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TransformCore *transform_core;
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GDisplay *gdisp;
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transform_core = (TransformCore *) tool->private;
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gdisp = (GDisplay *) gdisp_ptr;
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switch (state)
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{
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case INIT :
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if (!transform_info)
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{
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transform_info = info_dialog_new (_("Shear Information"),
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tools_help_func, NULL);
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info_dialog_add_spinbutton (transform_info,
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_("Shear Magnitude X:"),
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&xshear_val,
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-65536, 65536, 1, 15, 1, 1, 0,
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shear_x_mag_changed, tool);
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info_dialog_add_spinbutton (transform_info,
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_("Y:"),
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&yshear_val,
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-65536, 65536, 1, 15, 1, 1, 0,
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shear_y_mag_changed, tool);
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}
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gtk_widget_set_sensitive (GTK_WIDGET (transform_info->shell), TRUE);
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direction_unknown = 1;
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transform_core->trans_info[HORZ_OR_VERT] = ORIENTATION_HORIZONTAL;
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transform_core->trans_info[XSHEAR] = 0.0;
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transform_core->trans_info[YSHEAR] = 0.0;
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return NULL;
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break;
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case MOTION :
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shear_tool_motion (tool, gdisp_ptr);
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return (shear_tool_recalc (tool, gdisp_ptr));
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break;
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case RECALC :
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return (shear_tool_recalc (tool, gdisp_ptr));
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break;
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case FINISH :
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gtk_widget_set_sensitive (GTK_WIDGET (transform_info->shell), FALSE);
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direction_unknown = 1;
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return shear_tool_shear (gdisp->gimage,
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gimage_active_drawable (gdisp->gimage),
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gdisp,
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transform_core->original,
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transform_tool_smoothing (),
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transform_core->transform);
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break;
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}
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return NULL;
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}
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Tool *
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tools_new_shear_tool (void)
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{
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Tool * tool;
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TransformCore * private;
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tool = transform_core_new (SHEAR, INTERACTIVE);
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private = tool->private;
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/* set the rotation specific transformation attributes */
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private->trans_func = shear_tool_transform;
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/* assemble the transformation matrix */
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gimp_matrix_identity (private->transform);
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return tool;
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}
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void
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tools_free_shear_tool (Tool *tool)
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{
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transform_core_free (tool);
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}
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static void
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shear_info_update (Tool *tool)
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{
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TransformCore * transform_core;
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transform_core = (TransformCore *) tool->private;
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xshear_val = transform_core->trans_info[XSHEAR];
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yshear_val = transform_core->trans_info[YSHEAR];
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info_dialog_update (transform_info);
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info_dialog_popup (transform_info);
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}
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static void
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shear_x_mag_changed (GtkWidget *w,
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gpointer data)
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{
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Tool *tool;
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TransformCore *transform_core;
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GDisplay *gdisp;
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int value;
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tool = (Tool *)data;
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if (tool)
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{
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gdisp = (GDisplay *) tool->gdisp_ptr;
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transform_core = (TransformCore *) tool->private;
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value = GTK_ADJUSTMENT (w)->value;
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if (value != transform_core->trans_info[XSHEAR])
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{
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draw_core_pause (transform_core->core, tool);
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transform_core->trans_info[XSHEAR] = value;
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shear_tool_recalc (tool, gdisp);
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draw_core_resume (transform_core->core, tool);
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}
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}
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}
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static void
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shear_y_mag_changed (GtkWidget *w,
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gpointer data)
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{
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Tool *tool;
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TransformCore *transform_core;
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GDisplay *gdisp;
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int value;
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tool = (Tool *)data;
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if (tool)
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{
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gdisp = (GDisplay *) tool->gdisp_ptr;
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transform_core = (TransformCore *) tool->private;
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value = GTK_ADJUSTMENT (w)->value;
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if (value != transform_core->trans_info[YSHEAR])
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{
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draw_core_pause (transform_core->core, tool);
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transform_core->trans_info[YSHEAR] = value;
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shear_tool_recalc (tool, gdisp);
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draw_core_resume (transform_core->core, tool);
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}
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}
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}
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static void
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shear_tool_motion (Tool *tool,
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void *gdisp_ptr)
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{
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TransformCore * transform_core;
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int diffx, diffy;
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int dir;
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transform_core = (TransformCore *) tool->private;
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diffx = transform_core->curx - transform_core->lastx;
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diffy = transform_core->cury - transform_core->lasty;
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/* If we haven't yet decided on which way to control shearing
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* decide using the maximum differential
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*/
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if (direction_unknown)
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{
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if (abs(diffx) > MIN_MOVE || abs(diffy) > MIN_MOVE)
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{
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if (abs(diffx) > abs(diffy))
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{
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transform_core->trans_info[HORZ_OR_VERT] = ORIENTATION_HORIZONTAL;
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transform_core->trans_info[ORIENTATION_VERTICAL] = 0.0;
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}
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else
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{
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transform_core->trans_info[HORZ_OR_VERT] = ORIENTATION_VERTICAL;
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transform_core->trans_info[ORIENTATION_HORIZONTAL] = 0.0;
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}
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direction_unknown = 0;
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}
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/* set the current coords to the last ones */
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else
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{
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transform_core->curx = transform_core->lastx;
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transform_core->cury = transform_core->lasty;
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}
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}
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/* if the direction is known, keep track of the magnitude */
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if (!direction_unknown)
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{
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dir = transform_core->trans_info[HORZ_OR_VERT];
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switch (transform_core->function)
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{
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case HANDLE_1 :
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if (dir == ORIENTATION_HORIZONTAL)
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transform_core->trans_info[XSHEAR] -= diffx;
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else
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transform_core->trans_info[YSHEAR] -= diffy;
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break;
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case HANDLE_2 :
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if (dir == ORIENTATION_HORIZONTAL)
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transform_core->trans_info[XSHEAR] -= diffx;
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else
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transform_core->trans_info[YSHEAR] += diffy;
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break;
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case HANDLE_3 :
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if (dir == ORIENTATION_HORIZONTAL)
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transform_core->trans_info[XSHEAR] += diffx;
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else
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transform_core->trans_info[YSHEAR] -= diffy;
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break;
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case HANDLE_4 :
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if (dir == ORIENTATION_HORIZONTAL)
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transform_core->trans_info[XSHEAR] += diffx;
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else
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transform_core->trans_info[YSHEAR] += diffy;
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break;
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default :
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return;
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}
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}
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}
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static void *
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shear_tool_recalc (Tool *tool,
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void *gdisp_ptr)
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{
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TransformCore * transform_core;
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GDisplay * gdisp;
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float width, height;
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float cx, cy;
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gdisp = (GDisplay *) tool->gdisp_ptr;
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transform_core = (TransformCore *) tool->private;
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cx = (transform_core->x1 + transform_core->x2) / 2.0;
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cy = (transform_core->y1 + transform_core->y2) / 2.0;
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width = transform_core->x2 - transform_core->x1;
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height = transform_core->y2 - transform_core->y1;
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if (width == 0)
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width = 1;
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if (height == 0)
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height = 1;
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/* assemble the transformation matrix */
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gimp_matrix_identity (transform_core->transform);
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gimp_matrix_translate (transform_core->transform, -cx, -cy);
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/* shear matrix */
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if (transform_core->trans_info[HORZ_OR_VERT] == ORIENTATION_HORIZONTAL)
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gimp_matrix_xshear (transform_core->transform,
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(float) transform_core->trans_info [XSHEAR] / height);
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else
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gimp_matrix_yshear (transform_core->transform,
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(float) transform_core->trans_info [YSHEAR] / width);
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gimp_matrix_translate (transform_core->transform, +cx, +cy);
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/* transform the bounding box */
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transform_bounding_box (tool);
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/* update the information dialog */
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shear_info_update (tool);
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return (void *) 1;
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}
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void *
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shear_tool_shear (GimpImage *gimage,
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GimpDrawable *drawable,
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GDisplay *gdisp,
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TileManager *float_tiles,
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int interpolation,
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GimpMatrix matrix)
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{
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void *ret;
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gimp_progress *progress;
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progress = progress_start (gdisp, _("Shearing..."), FALSE, NULL, NULL);
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ret = transform_core_do (gimage, drawable, float_tiles,
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interpolation, matrix,
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progress? progress_update_and_flush:NULL, progress);
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if (progress)
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progress_end (progress);
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return ret;
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}
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