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gimp/app/tools/gimpscaletool.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 <string.h>
#include <gtk/gtk.h>
#include "libgimpbase/gimpbase.h"
#include "libgimpmath/gimpmath.h"
#include "libgimpwidgets/gimpwidgets.h"
#include "tools-types.h"
#include "core/gimp-transform-utils.h"
#include "core/gimpimage.h"
#include "core/gimpdrawable-transform.h"
#include "core/gimptoolinfo.h"
#include "core/gimpunit.h"
#include "widgets/gimphelp-ids.h"
#include "widgets/gimpsizebox.h"
#include "display/gimpdisplay.h"
#include "display/gimpdisplayshell.h"
#include "gimpscaletool.h"
#include "gimptoolcontrol.h"
#include "gimptransformoptions.h"
#include "gimp-intl.h"
/* local function prototypes */
static void gimp_scale_tool_dialog (GimpTransformTool *tr_tool);
static void gimp_scale_tool_dialog_update (GimpTransformTool *tr_tool);
static void gimp_scale_tool_prepare (GimpTransformTool *tr_tool,
GimpDisplay *display);
static void gimp_scale_tool_motion (GimpTransformTool *tr_tool,
GimpDisplay *display);
static void gimp_scale_tool_recalc (GimpTransformTool *tr_tool,
GimpDisplay *display);
static void gimp_scale_tool_size_notify (GtkWidget *box,
GParamSpec *pspec,
GimpTransformTool *tr_tool);
G_DEFINE_TYPE (GimpScaleTool, gimp_scale_tool, GIMP_TYPE_TRANSFORM_TOOL)
#define parent_class gimp_scale_tool_parent_class
void
gimp_scale_tool_register (GimpToolRegisterCallback callback,
gpointer data)
{
(* callback) (GIMP_TYPE_SCALE_TOOL,
GIMP_TYPE_TRANSFORM_OPTIONS,
gimp_transform_options_gui,
0,
"gimp-scale-tool",
_("Scale"),
_("Scale the layer or selection"),
N_("_Scale"), "<shift>T",
NULL, GIMP_HELP_TOOL_SCALE,
GIMP_STOCK_TOOL_SCALE,
data);
}
static void
gimp_scale_tool_class_init (GimpScaleToolClass *klass)
{
GimpTransformToolClass *trans_class = GIMP_TRANSFORM_TOOL_CLASS (klass);
trans_class->dialog = gimp_scale_tool_dialog;
trans_class->dialog_update = gimp_scale_tool_dialog_update;
trans_class->prepare = gimp_scale_tool_prepare;
trans_class->motion = gimp_scale_tool_motion;
trans_class->recalc = gimp_scale_tool_recalc;
}
static void
gimp_scale_tool_init (GimpScaleTool *scale_tool)
{
GimpTool *tool = GIMP_TOOL (scale_tool);
GimpTransformTool *tr_tool = GIMP_TRANSFORM_TOOL (scale_tool);
gimp_tool_control_set_tool_cursor (tool->control, GIMP_TOOL_CURSOR_RESIZE);
tr_tool->undo_desc = Q_("command|Scale");
tr_tool->shell_desc = _("Scaling Information");
tr_tool->progress_text = _("Scaling");
tr_tool->use_grid = TRUE;
tr_tool->use_handles = TRUE;
tr_tool->use_center = TRUE;
tr_tool->use_mid_handles = TRUE;
}
static void
gimp_scale_tool_dialog (GimpTransformTool *tr_tool)
{
}
static void
gimp_scale_tool_dialog_update (GimpTransformTool *tr_tool)
{
GimpTransformOptions *options;
gint width = ROUND (tr_tool->trans_info[X1] - tr_tool->trans_info[X0]);
gint height = ROUND (tr_tool->trans_info[Y1] - tr_tool->trans_info[Y0]);
options =
GIMP_TRANSFORM_OPTIONS (GIMP_TOOL (tr_tool)->tool_info->tool_options);
g_object_set (GIMP_SCALE_TOOL (tr_tool)->box,
"width", width,
"height", height,
"keep-aspect", options->constrain,
NULL);
}
static void
gimp_scale_tool_prepare (GimpTransformTool *tr_tool,
GimpDisplay *display)
{
GimpScaleTool *scale = GIMP_SCALE_TOOL (tr_tool);
GimpTransformOptions *options;
options = GIMP_TRANSFORM_OPTIONS (GIMP_TOOL (scale)->tool_info->tool_options);
tr_tool->trans_info[X0] = (gdouble) tr_tool->x1;
tr_tool->trans_info[Y0] = (gdouble) tr_tool->y1;
tr_tool->trans_info[X1] = (gdouble) tr_tool->x2;
tr_tool->trans_info[Y1] = (gdouble) tr_tool->y2;
if (scale->box)
{
g_signal_handlers_disconnect_by_func (scale->box,
gimp_scale_tool_size_notify,
tr_tool);
gtk_widget_destroy (scale->box);
}
/* Need to create a new GimpSizeBox widget because the initial
* width and height is what counts as 100%.
*/
scale->box =
g_object_new (GIMP_TYPE_SIZE_BOX,
"width", tr_tool->x2 - tr_tool->x1,
"height", tr_tool->y2 - tr_tool->y1,
"keep-aspect", options->constrain,
"unit", GIMP_DISPLAY_SHELL (display->shell)->unit,
"xresolution", display->image->xresolution,
"yresolution", display->image->yresolution,
NULL);
gtk_container_set_border_width (GTK_CONTAINER (scale->box), 6);
gtk_box_pack_start (GTK_BOX (GTK_DIALOG (tr_tool->dialog)->vbox), scale->box,
FALSE, FALSE, 0);
gtk_widget_show (scale->box);
g_signal_connect (scale->box, "notify",
G_CALLBACK (gimp_scale_tool_size_notify),
tr_tool);
}
static void
gimp_scale_tool_motion (GimpTransformTool *tr_tool,
GimpDisplay *display)
{
GimpTransformOptions *options;
gdouble *x1;
gdouble *y1;
gdouble *x2;
gdouble *y2;
gint dir_x;
gint dir_y;
gdouble diff_x = tr_tool->curx - tr_tool->lastx;
gdouble diff_y = tr_tool->cury - tr_tool->lasty;
switch (tr_tool->function)
{
case TRANSFORM_HANDLE_N:
diff_x = 0; /* and fall through */
case TRANSFORM_HANDLE_NW:
x1 = &tr_tool->trans_info[X0];
y1 = &tr_tool->trans_info[Y0];
x2 = &tr_tool->trans_info[X1];
y2 = &tr_tool->trans_info[Y1];
dir_x = dir_y = 1;
break;
case TRANSFORM_HANDLE_E:
diff_y = 0; /* and fall through */
case TRANSFORM_HANDLE_NE:
x1 = &tr_tool->trans_info[X1];
y1 = &tr_tool->trans_info[Y0];
x2 = &tr_tool->trans_info[X0];
y2 = &tr_tool->trans_info[Y1];
dir_x = -1;
dir_y = 1;
break;
case TRANSFORM_HANDLE_W:
diff_y = 0; /* and fall through */
case TRANSFORM_HANDLE_SW:
x1 = &tr_tool->trans_info[X0];
y1 = &tr_tool->trans_info[Y1];
x2 = &tr_tool->trans_info[X1];
y2 = &tr_tool->trans_info[Y0];
dir_x = 1;
dir_y = -1;
break;
case TRANSFORM_HANDLE_S:
diff_x = 0; /* and fall through */
case TRANSFORM_HANDLE_SE:
x1 = &tr_tool->trans_info[X1];
y1 = &tr_tool->trans_info[Y1];
x2 = &tr_tool->trans_info[X0];
y2 = &tr_tool->trans_info[Y0];
dir_x = dir_y = -1;
break;
case TRANSFORM_HANDLE_CENTER:
tr_tool->trans_info[X0] += diff_x;
tr_tool->trans_info[Y0] += diff_y;
tr_tool->trans_info[X1] += diff_x;
tr_tool->trans_info[Y1] += diff_y;
tr_tool->trans_info[X2] += diff_x;
tr_tool->trans_info[Y2] += diff_y;
tr_tool->trans_info[X3] += diff_x;
tr_tool->trans_info[Y3] += diff_y;
return;
default:
return;
}
/* if control is being held, constrain the aspect ratio */
options =
GIMP_TRANSFORM_OPTIONS (GIMP_TOOL (tr_tool)->tool_info->tool_options);
if (options->constrain)
{
gdouble mag;
gdouble dot;
mag = hypot ((gdouble) (tr_tool->x2 - tr_tool->x1),
(gdouble) (tr_tool->y2 - tr_tool->y1));
dot = (dir_x * diff_x * (tr_tool->x2 - tr_tool->x1) +
dir_y * diff_y * (tr_tool->y2 - tr_tool->y1));
if (mag > 0.0)
{
diff_x = dir_x * (tr_tool->x2 - tr_tool->x1) * dot / (mag * mag);
diff_y = dir_y * (tr_tool->y2 - tr_tool->y1) * dot / (mag * mag);
}
else
{
diff_x = diff_y = 0;
}
}
*x1 += diff_x;
*y1 += diff_y;
if (dir_x > 0)
{
if (*x1 >= *x2)
*x1 = *x2 - 1;
}
else
{
if (*x1 <= *x2)
*x1 = *x2 + 1;
}
if (dir_y > 0)
{
if (*y1 >= *y2)
*y1 = *y2 - 1;
}
else
{
if (*y1 <= *y2)
*y1 = *y2 + 1;
}
}
static void
gimp_scale_tool_recalc (GimpTransformTool *tr_tool,
GimpDisplay *display)
{
gimp_matrix3_identity (&tr_tool->transform);
gimp_transform_matrix_scale (&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[X0],
tr_tool->trans_info[Y0],
tr_tool->trans_info[X1] - tr_tool->trans_info[X0],
tr_tool->trans_info[Y1] - tr_tool->trans_info[Y0]);
}
static void
gimp_scale_tool_size_notify (GtkWidget *box,
GParamSpec *pspec,
GimpTransformTool *tr_tool)
{
GimpTransformOptions *options;
options =
GIMP_TRANSFORM_OPTIONS (GIMP_TOOL (tr_tool)->tool_info->tool_options);
if (! strcmp (pspec->name, "width") ||
! strcmp (pspec->name, "height"))
{
gint width;
gint height;
gint old_width;
gint old_height;
g_object_get (box,
"width", &width,
"height", &height,
NULL);
old_width = ROUND (tr_tool->trans_info[X1] - tr_tool->trans_info[X0]);
old_height = ROUND (tr_tool->trans_info[Y1] - tr_tool->trans_info[Y0]);
if ((width != old_width) || (height != old_height))
{
gimp_draw_tool_pause (GIMP_DRAW_TOOL (tr_tool));
tr_tool->trans_info[X1] = tr_tool->trans_info[X0] + width;
tr_tool->trans_info[Y1] = tr_tool->trans_info[Y0] + height;
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));
}
}
else if (! strcmp (pspec->name, "keep-aspect"))
{
gboolean constrain;
g_object_get (box,
"keep-aspect", &constrain,
NULL);
if (constrain != options->constrain)
{
g_object_set (options,
"constrain", constrain,
NULL);
}
}
}
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