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gimp/app/tools/gimpsheartool.c

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/* GIMP - The GNU 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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <stdlib.h>
#include <string.h>
#include <gtk/gtk.h>
#include "libgimpwidgets/gimpwidgets.h"
#include "tools-types.h"
#include "core/gimp-transform-utils.h"
#include "widgets/gimphelp-ids.h"
#include "gimpsheartool.h"
#include "gimptoolcontrol.h"
#include "gimptransformoptions.h"
#include "gimp-intl.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
#define SB_WIDTH 10
/* local function prototypes */
static void gimp_shear_tool_dialog (GimpTransformTool *tr_tool);
static void gimp_shear_tool_dialog_update (GimpTransformTool *tr_tool);
static void gimp_shear_tool_prepare (GimpTransformTool *tr_tool,
GimpDisplay *display);
static void gimp_shear_tool_motion (GimpTransformTool *tr_tool,
GimpDisplay *display);
static void gimp_shear_tool_recalc (GimpTransformTool *tr_tool,
GimpDisplay *display);
static void shear_x_mag_changed (GtkAdjustment *adj,
GimpTransformTool *tr_tool);
static void shear_y_mag_changed (GtkAdjustment *adj,
GimpTransformTool *tr_tool);
G_DEFINE_TYPE (GimpShearTool, gimp_shear_tool, GIMP_TYPE_TRANSFORM_TOOL)
void
gimp_shear_tool_register (GimpToolRegisterCallback callback,
gpointer data)
{
(* callback) (GIMP_TYPE_SHEAR_TOOL,
GIMP_TYPE_TRANSFORM_OPTIONS,
gimp_transform_options_gui,
0,
"gimp-shear-tool",
_("Shear"),
_("Shear Tool: Shear the layer, selection or path"),
N_("S_hear"), "<shift>S",
NULL, GIMP_HELP_TOOL_SHEAR,
GIMP_STOCK_TOOL_SHEAR,
data);
}
static void
gimp_shear_tool_class_init (GimpShearToolClass *klass)
{
GimpTransformToolClass *trans_class = GIMP_TRANSFORM_TOOL_CLASS (klass);
trans_class->dialog = gimp_shear_tool_dialog;
trans_class->dialog_update = gimp_shear_tool_dialog_update;
trans_class->prepare = gimp_shear_tool_prepare;
trans_class->motion = gimp_shear_tool_motion;
trans_class->recalc = gimp_shear_tool_recalc;
}
static void
gimp_shear_tool_init (GimpShearTool *shear_tool)
{
GimpTool *tool = GIMP_TOOL (shear_tool);
GimpTransformTool *tr_tool = GIMP_TRANSFORM_TOOL (shear_tool);
gimp_tool_control_set_tool_cursor (tool->control, GIMP_TOOL_CURSOR_SHEAR);
tr_tool->undo_desc = C_("command", "Shear");
tr_tool->progress_text = _("Shearing");
tr_tool->use_grid = TRUE;
}
static void
gimp_shear_tool_dialog (GimpTransformTool *tr_tool)
{
GimpShearTool *shear = GIMP_SHEAR_TOOL (tr_tool);
GtkWidget *table;
GtkWidget *button;
table = gtk_table_new (2, 2, FALSE);
gtk_container_set_border_width (GTK_CONTAINER (table), 6);
gtk_table_set_row_spacings (GTK_TABLE (table), 2);
gtk_table_set_col_spacings (GTK_TABLE (table), 6);
gtk_box_pack_start (GTK_BOX (gtk_dialog_get_content_area (GTK_DIALOG (tr_tool->dialog))),
table, FALSE, FALSE, 0);
gtk_widget_show (table);
button = gimp_spin_button_new (&shear->x_adj,
0, -65536, 65536, 1, 15, 0, 1, 0);
gtk_entry_set_width_chars (GTK_ENTRY (button), SB_WIDTH);
gimp_table_attach_aligned (GTK_TABLE (table), 0, 0, _("Shear magnitude _X:"),
0.0, 0.5, button, 1, TRUE);
g_signal_connect (shear->x_adj, "value-changed",
G_CALLBACK (shear_x_mag_changed),
tr_tool);
button = gimp_spin_button_new (&shear->y_adj,
0, -65536, 65536, 1, 15, 0, 1, 0);
gtk_entry_set_width_chars (GTK_ENTRY (button), SB_WIDTH);
gimp_table_attach_aligned (GTK_TABLE (table), 0, 1, _("Shear magnitude _Y:"),
0.0, 0.5, button, 1, TRUE);
g_signal_connect (shear->y_adj, "value-changed",
G_CALLBACK (shear_y_mag_changed),
tr_tool);
}
static void
gimp_shear_tool_dialog_update (GimpTransformTool *tr_tool)
{
GimpShearTool *shear = GIMP_SHEAR_TOOL (tr_tool);
gtk_adjustment_set_value (GTK_ADJUSTMENT (shear->x_adj),
tr_tool->trans_info[XSHEAR]);
gtk_adjustment_set_value (GTK_ADJUSTMENT (shear->y_adj),
tr_tool->trans_info[YSHEAR]);
}
static void
gimp_shear_tool_prepare (GimpTransformTool *tr_tool,
GimpDisplay *display)
{
tr_tool->trans_info[HORZ_OR_VERT] = GIMP_ORIENTATION_UNKNOWN;
tr_tool->trans_info[XSHEAR] = 0.0;
tr_tool->trans_info[YSHEAR] = 0.0;
}
static void
gimp_shear_tool_motion (GimpTransformTool *tr_tool,
GimpDisplay *display)
{
gdouble diffx = tr_tool->curx - tr_tool->lastx;
gdouble diffy = tr_tool->cury - tr_tool->lasty;
/* If we haven't yet decided on which way to control shearing
* decide using the maximum differential
*/
if (tr_tool->trans_info[HORZ_OR_VERT] == GIMP_ORIENTATION_UNKNOWN)
{
if (abs (diffx) > MIN_MOVE || abs (diffy) > MIN_MOVE)
{
if (abs (diffx) > abs (diffy))
{
tr_tool->trans_info[HORZ_OR_VERT] = GIMP_ORIENTATION_HORIZONTAL;
tr_tool->trans_info[XSHEAR] = 0.0;
}
else
{
tr_tool->trans_info[HORZ_OR_VERT] = GIMP_ORIENTATION_VERTICAL;
tr_tool->trans_info[XSHEAR] = 0.0;
}
}
/* set the current coords to the last ones */
else
{
tr_tool->curx = tr_tool->lastx;
tr_tool->cury = tr_tool->lasty;
}
}
/* if the direction is known, keep track of the magnitude */
if (tr_tool->trans_info[HORZ_OR_VERT] == GIMP_ORIENTATION_HORIZONTAL)
{
if (tr_tool->cury > (tr_tool->ty1 + tr_tool->ty3) / 2)
tr_tool->trans_info[XSHEAR] += diffx;
else
tr_tool->trans_info[XSHEAR] -= diffx;
}
else if (tr_tool->trans_info[HORZ_OR_VERT] == GIMP_ORIENTATION_VERTICAL)
{
if (tr_tool->curx > (tr_tool->tx1 + tr_tool->tx2) / 2)
tr_tool->trans_info[YSHEAR] += diffy;
else
tr_tool->trans_info[YSHEAR] -= diffy;
}
}
static void
gimp_shear_tool_recalc (GimpTransformTool *tr_tool,
GimpDisplay *display)
{
gdouble amount;
if (tr_tool->trans_info[XSHEAR] == 0.0 &&
tr_tool->trans_info[YSHEAR] == 0.0)
{
tr_tool->trans_info[HORZ_OR_VERT] = GIMP_ORIENTATION_UNKNOWN;
}
if (tr_tool->trans_info[HORZ_OR_VERT] == GIMP_ORIENTATION_HORIZONTAL)
amount = tr_tool->trans_info[XSHEAR];
else
amount = tr_tool->trans_info[YSHEAR];
gimp_matrix3_identity (&tr_tool->transform);
gimp_transform_matrix_shear (&tr_tool->transform,
tr_tool->x1,
tr_tool->y1,
tr_tool->x2 - tr_tool->x1,
tr_tool->y2 - tr_tool->y1,
tr_tool->trans_info[HORZ_OR_VERT],
amount);
}
static void
shear_x_mag_changed (GtkAdjustment *adj,
GimpTransformTool *tr_tool)
{
gdouble value = gtk_adjustment_get_value (adj);
if (value != tr_tool->trans_info[XSHEAR])
{
gimp_draw_tool_pause (GIMP_DRAW_TOOL (tr_tool));
if (tr_tool->trans_info[HORZ_OR_VERT] == GIMP_ORIENTATION_UNKNOWN)
tr_tool->trans_info[HORZ_OR_VERT] = GIMP_ORIENTATION_HORIZONTAL;
tr_tool->trans_info[XSHEAR] = value;
gimp_transform_tool_recalc (tr_tool, GIMP_TOOL (tr_tool)->display);
gimp_transform_tool_expose_preview (tr_tool);
gimp_draw_tool_resume (GIMP_DRAW_TOOL (tr_tool));
}
}
static void
shear_y_mag_changed (GtkAdjustment *adj,
GimpTransformTool *tr_tool)
{
gdouble value = gtk_adjustment_get_value (adj);
if (value != tr_tool->trans_info[YSHEAR])
{
gimp_draw_tool_pause (GIMP_DRAW_TOOL (tr_tool));
if (tr_tool->trans_info[HORZ_OR_VERT] == GIMP_ORIENTATION_UNKNOWN)
tr_tool->trans_info[HORZ_OR_VERT] = GIMP_ORIENTATION_VERTICAL;
tr_tool->trans_info[YSHEAR] = value;
gimp_transform_tool_recalc (tr_tool, GIMP_TOOL (tr_tool)->display);
gimp_transform_tool_expose_preview (tr_tool);
gimp_draw_tool_resume (GIMP_DRAW_TOOL (tr_tool));
}
}
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