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app: add GimpCanvasTransformGuides and use them in the transform tool 

which removes a lot of code from the transform tool, and reduces the
number of canvas items used for the transform grid from possibly
gazillions to one.
This commit is contained in:
Michael Natterer 2011-07-24 18:42:13 +02:00
parent 43788feb50
commit c2e6f24687
7 changed files with 622 additions and 149 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
app/display/Makefile.am
View File

@ -63,6 +63,8 @@ libappdisplay_a_sources = \
gimpcanvassamplepoint.h \
gimpcanvastextcursor.c \
gimpcanvastextcursor.h \
gimpcanvastransformguides.c \
gimpcanvastransformguides.h \
gimpcanvastransformpreview.c \
gimpcanvastransformpreview.h \
gimpcursorview.c \

511
app/display/gimpcanvastransformguides.c Normal file
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@ -0,0 +1,511 @@
/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* gimpcanvastransformguides.c
* Copyright (C) 2011 Michael Natterer <mitch@gimp.org>
*
* 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 <gegl.h>
#include <gtk/gtk.h>
#include "libgimpbase/gimpbase.h"
#include "libgimpmath/gimpmath.h"
#include "display-types.h"
#include "core/gimp-transform-utils.h"
#include "gimpcanvastransformguides.h"
#include "gimpdisplayshell.h"
#include "gimpdisplayshell-transform.h"
#include "core/gimp-utils.h"
enum
{
PROP_0,
PROP_TRANSFORM,
PROP_X1,
PROP_Y1,
PROP_X2,
PROP_Y2,
PROP_TYPE,
PROP_N_GUIDES
};
typedef struct _GimpCanvasTransformGuidesPrivate GimpCanvasTransformGuidesPrivate;
struct _GimpCanvasTransformGuidesPrivate
{
GimpMatrix3 transform;
gdouble x1, y1;
gdouble x2, y2;
GimpGuidesType type;
gint n_guides;
};
#define GET_PRIVATE(transform) \
G_TYPE_INSTANCE_GET_PRIVATE (transform, \
GIMP_TYPE_CANVAS_TRANSFORM_GUIDES, \
GimpCanvasTransformGuidesPrivate)
/* local function prototypes */
static void gimp_canvas_transform_guides_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec);
static void gimp_canvas_transform_guides_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec);
static void gimp_canvas_transform_guides_draw (GimpCanvasItem *item,
GimpDisplayShell *shell,
cairo_t *cr);
static cairo_region_t * gimp_canvas_transform_guides_get_extents (GimpCanvasItem *item,
GimpDisplayShell *shell);
G_DEFINE_TYPE (GimpCanvasTransformGuides, gimp_canvas_transform_guides,
GIMP_TYPE_CANVAS_ITEM)
#define parent_class gimp_canvas_transform_guides_parent_class
static void
gimp_canvas_transform_guides_class_init (GimpCanvasTransformGuidesClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GimpCanvasItemClass *item_class = GIMP_CANVAS_ITEM_CLASS (klass);
object_class->set_property = gimp_canvas_transform_guides_set_property;
object_class->get_property = gimp_canvas_transform_guides_get_property;
item_class->draw = gimp_canvas_transform_guides_draw;
item_class->get_extents = gimp_canvas_transform_guides_get_extents;
g_object_class_install_property (object_class, PROP_TRANSFORM,
gimp_param_spec_matrix3 ("transform",
NULL, NULL,
NULL,
GIMP_PARAM_READWRITE));
g_object_class_install_property (object_class, PROP_X1,
g_param_spec_double ("x1",
NULL, NULL,
-GIMP_MAX_IMAGE_SIZE,
GIMP_MAX_IMAGE_SIZE,
0.0,
GIMP_PARAM_READWRITE));
g_object_class_install_property (object_class, PROP_Y1,
g_param_spec_double ("y1",
NULL, NULL,
-GIMP_MAX_IMAGE_SIZE,
GIMP_MAX_IMAGE_SIZE,
0.0,
GIMP_PARAM_READWRITE));
g_object_class_install_property (object_class, PROP_X2,
g_param_spec_double ("x2",
NULL, NULL,
-GIMP_MAX_IMAGE_SIZE,
GIMP_MAX_IMAGE_SIZE,
0.0,
GIMP_PARAM_READWRITE));
g_object_class_install_property (object_class, PROP_Y2,
g_param_spec_double ("y2",
NULL, NULL,
-GIMP_MAX_IMAGE_SIZE,
GIMP_MAX_IMAGE_SIZE,
0.0,
GIMP_PARAM_READWRITE));
g_object_class_install_property (object_class, PROP_TYPE,
g_param_spec_enum ("type", NULL, NULL,
GIMP_TYPE_GUIDES_TYPE,
GIMP_GUIDES_NONE,
GIMP_PARAM_READWRITE));
g_object_class_install_property (object_class, PROP_N_GUIDES,
g_param_spec_int ("n-guides", NULL, NULL,
1, 128, 4,
GIMP_PARAM_READWRITE));
g_type_class_add_private (klass, sizeof (GimpCanvasTransformGuidesPrivate));
}
static void
gimp_canvas_transform_guides_init (GimpCanvasTransformGuides *transform)
{
}
static void
gimp_canvas_transform_guides_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec)
{
GimpCanvasTransformGuidesPrivate *private = GET_PRIVATE (object);
switch (property_id)
{
case PROP_TRANSFORM:
{
GimpMatrix3 *transform = g_value_get_boxed (value);
if (transform)
private->transform = *transform;
else
gimp_matrix3_identity (&private->transform);
}
break;
case PROP_X1:
private->x1 = g_value_get_double (value);
break;
case PROP_Y1:
private->y1 = g_value_get_double (value);
break;
case PROP_X2:
private->x2 = g_value_get_double (value);
break;
case PROP_Y2:
private->y2 = g_value_get_double (value);
break;
case PROP_TYPE:
private->type = g_value_get_enum (value);
break;
case PROP_N_GUIDES:
private->n_guides = g_value_get_int (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
gimp_canvas_transform_guides_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec)
{
GimpCanvasTransformGuidesPrivate *private = GET_PRIVATE (object);
switch (property_id)
{
case PROP_TRANSFORM:
g_value_set_boxed (value, &private->transform);
break;
case PROP_X1:
g_value_set_double (value, private->x1);
break;
case PROP_Y1:
g_value_set_double (value, private->y1);
break;
case PROP_X2:
g_value_set_double (value, private->x2);
break;
case PROP_Y2:
g_value_set_double (value, private->y2);
break;
case PROP_TYPE:
g_value_set_enum (value, private->type);
break;
case PROP_N_GUIDES:
g_value_set_int (value, private->n_guides);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static gboolean
gimp_canvas_transform_guides_transform (GimpCanvasItem *item,
GimpDisplayShell *shell,
gdouble *tx1,
gdouble *ty1,
gdouble *tx2,
gdouble *ty2,
gdouble *tx3,
gdouble *ty3,
gdouble *tx4,
gdouble *ty4)
{
GimpCanvasTransformGuidesPrivate *private = GET_PRIVATE (item);
gimp_matrix3_transform_point (&private->transform,
private->x1, private->y1,
tx1, ty1);
gimp_matrix3_transform_point (&private->transform,
private->x2, private->y1,
tx2, ty2);
gimp_matrix3_transform_point (&private->transform,
private->x1, private->y2,
tx3, ty3);
gimp_matrix3_transform_point (&private->transform,
private->x2, private->y2,
tx4, ty4);
return gimp_transform_polygon_is_convex (*tx1, *ty1,
*tx2, *ty2,
*tx3, *ty3,
*tx4, *ty4);
}
static void
draw_line (cairo_t *cr,
GimpDisplayShell *shell,
GimpMatrix3 *transform,
gdouble x1,
gdouble y1,
gdouble x2,
gdouble y2)
{
gimp_matrix3_transform_point (transform, x1, y1, &x1, &y1);
gimp_matrix3_transform_point (transform, x2, y2, &x2, &y2);
gimp_display_shell_transform_xy_f (shell, x1, y1, &x1, &y1);
gimp_display_shell_transform_xy_f (shell, x2, y2, &x2, &y2);
x1 = floor (x1) + 0.5;
y1 = floor (y1) + 0.5;
x2 = floor (x2) + 0.5;
y2 = floor (y2) + 0.5;
cairo_move_to (cr, x1, y1);
cairo_line_to (cr, x2, y2);
}
static void
gimp_canvas_transform_guides_draw (GimpCanvasItem *item,
GimpDisplayShell *shell,
cairo_t *cr)
{
GimpCanvasTransformGuidesPrivate *private = GET_PRIVATE (item);
gdouble x1, y1;
gdouble x2, y2;
gdouble x3, y3;
gdouble x4, y4;
gboolean convex;
convex = gimp_canvas_transform_guides_transform (item, shell,
&x1, &y1,
&x2, &y2,
&x3, &y3,
&x4, &y4);
gimp_display_shell_transform_xy_f (shell, x1, y1, &x1, &y1);
gimp_display_shell_transform_xy_f (shell, x2, y2, &x2, &y2);
gimp_display_shell_transform_xy_f (shell, x3, y3, &x3, &y3);
gimp_display_shell_transform_xy_f (shell, x4, y4, &x4, &y4);
x1 = floor (x1) + 0.5;
y1 = floor (y1) + 0.5;
x2 = floor (x2) + 0.5;
y2 = floor (y2) + 0.5;
x3 = floor (x3) + 0.5;
y3 = floor (y3) + 0.5;
x4 = floor (x4) + 0.5;
y4 = floor (y4) + 0.5;
cairo_move_to (cr, x1, y1);
cairo_line_to (cr, x2, y2);
cairo_line_to (cr, x4, y4);
cairo_line_to (cr, x3, y3);
cairo_line_to (cr, x1, y1);
if (! convex)
{
_gimp_canvas_item_stroke (item, cr);
return;
}
switch (private->type)
{
case GIMP_GUIDES_NONE:
break;
case GIMP_GUIDES_CENTER_LINES:
/* TODO */
break;
case GIMP_GUIDES_THIRDS:
/* TODO */
break;
case GIMP_GUIDES_FIFTHS:
/* TODO */
break;
case GIMP_GUIDES_GOLDEN:
/* TODO */
break;
case GIMP_GUIDES_DIAGONALS:
/* TODO */
break;
case GIMP_GUIDES_N_LINES:
case GIMP_GUIDES_SPACING:
{
gint width, height;
gint ngx, ngy;
gint i;
width = MAX (1, private->x2 - private->x1);
height = MAX (1, private->y2 - private->y1);
if (private->type == GIMP_GUIDES_N_LINES)
{
if (width <= height)
{
ngx = private->n_guides;
ngy = ngx * MAX (1, height / width);
}
else
{
ngy = private->n_guides;
ngx = ngy * MAX (1, width / height);
}
}
else /* GIMP_GUIDES_SPACING */
{
gint grid_size = MAX (2, private->n_guides);
ngx = width / grid_size;
ngy = height / grid_size;
}
for (i = 1; i <= ngx; i++)
{
gdouble x = private->x1 + (((gdouble) i) / (ngx + 1) *
(private->x2 - private->x1));
draw_line (cr, shell, &private->transform,
x, private->y1,
x, private->y2);
}
for (i = 1; i <= ngy; i++)
{
gdouble y = private->y1 + (((gdouble) i) / (ngy + 1) *
(private->y2 - private->y1));
draw_line (cr, shell, &private->transform,
private->x1, y,
private->x2, y);
}
}
}
_gimp_canvas_item_stroke (item, cr);
}
static cairo_region_t *
gimp_canvas_transform_guides_get_extents (GimpCanvasItem *item,
GimpDisplayShell *shell)
{
gdouble x1, y1;
gdouble x2, y2;
gdouble x3, y3;
gdouble x4, y4;
cairo_rectangle_int_t extents;
gimp_canvas_transform_guides_transform (item, shell,
&x1, &y1,
&x2, &y2,
&x3, &y3,
&x4, &y4);
gimp_display_shell_transform_xy_f (shell, x1, y1, &x1, &y1);
gimp_display_shell_transform_xy_f (shell, x2, y2, &x2, &y2);
gimp_display_shell_transform_xy_f (shell, x3, y3, &x3, &y3);
gimp_display_shell_transform_xy_f (shell, x4, y4, &x4, &y4);
extents.x = (gint) floor (MIN4 (x1, x2, x3, x4) - 1.5);
extents.y = (gint) floor (MIN4 (y1, y2, y3, y4) - 1.5);
extents.width = (gint) ceil (MAX4 (x1, x2, x3, x4) + 1.5);
extents.height = (gint) ceil (MAX4 (y1, y2, y3, y4) + 1.5);
extents.width -= extents.x;
extents.height -= extents.y;
return cairo_region_create_rectangle (&extents);
}
GimpCanvasItem *
gimp_canvas_transform_guides_new (GimpDisplayShell *shell,
const GimpMatrix3 *transform,
gdouble x1,
gdouble y1,
gdouble x2,
gdouble y2,
GimpGuidesType type,
gint n_guides)
{
g_return_val_if_fail (GIMP_IS_DISPLAY_SHELL (shell), NULL);
return g_object_new (GIMP_TYPE_CANVAS_TRANSFORM_GUIDES,
"shell", shell,
"transform", transform,
"x1", x1,
"y1", y1,
"x2", x2,
"y2", y2,
"type", type,
"n-guides", n_guides,
NULL);
}
void
gimp_canvas_transform_guides_set (GimpCanvasItem *guides,
const GimpMatrix3 *transform,
GimpGuidesType type,
gint n_guides)
{
g_return_if_fail (GIMP_IS_CANVAS_TRANSFORM_GUIDES (guides));
gimp_canvas_item_begin_change (guides);
g_object_set (guides,
"transform", transform,
"type", type,
"n-guides", n_guides,
NULL);
gimp_canvas_item_end_change (guides);
}

67
app/display/gimpcanvastransformguides.h Normal file
View File

@ -0,0 +1,67 @@
/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* gimpcanvastransformguides.h
* Copyright (C) 2011 Michael Natterer <mitch@gimp.org>
*
* 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/>.
*/
#ifndef __GIMP_CANVAS_TRANSFORM_GUIDES_H__
#define __GIMP_CANVAS_TRANSFORM_GUIDES_H__
#include "gimpcanvasitem.h"
#define GIMP_TYPE_CANVAS_TRANSFORM_GUIDES (gimp_canvas_transform_guides_get_type ())
#define GIMP_CANVAS_TRANSFORM_GUIDES(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_CANVAS_TRANSFORM_GUIDES, GimpCanvasTransformGuides))
#define GIMP_CANVAS_TRANSFORM_GUIDES_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GIMP_TYPE_CANVAS_TRANSFORM_GUIDES, GimpCanvasTransformGuidesClass))
#define GIMP_IS_CANVAS_TRANSFORM_GUIDES(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_CANVAS_TRANSFORM_GUIDES))
#define GIMP_IS_CANVAS_TRANSFORM_GUIDES_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GIMP_TYPE_CANVAS_TRANSFORM_GUIDES))
#define GIMP_CANVAS_TRANSFORM_GUIDES_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GIMP_TYPE_CANVAS_TRANSFORM_GUIDES, GimpCanvasTransformGuidesClass))
typedef struct _GimpCanvasTransformGuides GimpCanvasTransformGuides;
typedef struct _GimpCanvasTransformGuidesClass GimpCanvasTransformGuidesClass;
struct _GimpCanvasTransformGuides
{
GimpCanvasItem parent_instance;
};
struct _GimpCanvasTransformGuidesClass
{
GimpCanvasItemClass parent_class;
};
GType gimp_canvas_transform_guides_get_type (void) G_GNUC_CONST;
GimpCanvasItem * gimp_canvas_transform_guides_new (GimpDisplayShell *shell,
const GimpMatrix3 *transform,
gdouble x1,
gdouble y1,
gdouble x2,
gdouble y2,
GimpGuidesType type,
gint n_guides);
void gimp_canvas_transform_guides_set (GimpCanvasItem *guides,
const GimpMatrix3 *transform,
GimpGuidesType type,
gint n_guides);
#endif /* __GIMP_CANVAS_TRANSFORM_GUIDES_H__ */

26
app/tools/gimpdrawtool.c
View File

@ -49,6 +49,7 @@
#include "display/gimpcanvasrectangleguides.h"
#include "display/gimpcanvassamplepoint.h"
#include "display/gimpcanvastextcursor.h"
#include "display/gimpcanvastransformguides.h"
#include "display/gimpcanvastransformpreview.h"
#include "display/gimpdisplay.h"
#include "display/gimpdisplayshell.h"
@ -863,6 +864,31 @@ gimp_draw_tool_add_text_cursor (GimpDrawTool *draw_tool,
return item;
}
GimpCanvasItem *
gimp_draw_tool_add_transform_guides (GimpDrawTool *draw_tool,
const GimpMatrix3 *transform,
GimpGuidesType type,
gint n_guides,
gdouble x1,
gdouble y1,
gdouble x2,
gdouble y2)
{
GimpCanvasItem *item;
g_return_val_if_fail (GIMP_IS_DRAW_TOOL (draw_tool), NULL);
g_return_val_if_fail (transform != NULL, NULL);
item = gimp_canvas_transform_guides_new (gimp_display_get_shell (draw_tool->display),
transform, x1, y1, x2, y2,
type, n_guides);
gimp_draw_tool_add_item (draw_tool, item);
g_object_unref (item);
return item;
}
GimpCanvasItem *
gimp_draw_tool_add_transform_preview (GimpDrawTool *draw_tool,
GimpDrawable *drawable,

8
app/tools/gimpdrawtool.h
View File

@ -135,6 +135,14 @@ GimpCanvasItem * gimp_draw_tool_add_arc (GimpDrawTool *draw_too
gdouble height,
gdouble start_angle,
gdouble slice_angle);
GimpCanvasItem * gimp_draw_tool_add_transform_guides (GimpDrawTool *draw_tool,
const GimpMatrix3 *transform,
GimpGuidesType type,
gint n_guides,
gdouble x1,
gdouble y1,
gdouble x2,
gdouble y2);
GimpCanvasItem * gimp_draw_tool_add_transform_preview(GimpDrawTool *draw_tool,
GimpDrawable *drawable,
const GimpMatrix3 *transform,

149
app/tools/gimptransformtool.c
View File

@ -140,7 +140,6 @@ static void gimp_transform_tool_prepare (GimpTransformTool
static void gimp_transform_tool_transform (GimpTransformTool *tr_tool,
GimpDisplay *display);
static void gimp_transform_tool_transform_bounding_box (GimpTransformTool *tr_tool);
static void gimp_transform_tool_grid_recalc (GimpTransformTool *tr_tool);
static void gimp_transform_tool_handles_recalc (GimpTransformTool *tr_tool,
GimpDisplay *display,
@ -222,12 +221,6 @@ gimp_transform_tool_finalize (GObject *object)
tr_tool->dialog = NULL;
}
if (tr_tool->grid_coords)
{
g_free (tr_tool->grid_coords);
tr_tool->grid_coords = NULL;
}
G_OBJECT_CLASS (parent_class)->finalize (object);
}
@ -674,7 +667,6 @@ gimp_transform_tool_options_notify (GimpTool *tool,
if (tr_tool->function != TRANSFORM_CREATING)
{
gimp_transform_tool_grid_recalc (tr_tool);
gimp_transform_tool_transform_bounding_box (tr_tool);
}
@ -703,8 +695,6 @@ gimp_transform_tool_draw (GimpDrawTool *draw_tool)
if (tr_tool->use_grid)
{
GimpCanvasGroup *stroke_group;
if (gimp_transform_options_show_preview (options))
{
gimp_draw_tool_add_transform_preview (draw_tool,
@ -718,52 +708,14 @@ gimp_transform_tool_draw (GimpDrawTool *draw_tool)
options->preview_opacity);
}
stroke_group = gimp_draw_tool_add_stroke_group (draw_tool);
gimp_draw_tool_push_group (draw_tool, stroke_group);
/* draw the grid */
if (tr_tool->grid_coords &&
gimp_transform_polygon_is_convex (tr_tool->tx1, tr_tool->ty1,
tr_tool->tx2, tr_tool->ty2,
tr_tool->tx3, tr_tool->ty3,
tr_tool->tx4, tr_tool->ty4))
{
gint k = tr_tool->ngx + tr_tool->ngy;
gint i, gci;
for (i = 0, gci = 0; i < k; i++, gci += 4)
{
gdouble x1, y1, x2, y2;
gimp_matrix3_transform_point (&tr_tool->transform,
tr_tool->grid_coords[gci],
tr_tool->grid_coords[gci + 1],
&x1, &y1);
gimp_matrix3_transform_point (&tr_tool->transform,
tr_tool->grid_coords[gci + 2],
tr_tool->grid_coords[gci + 3],
&x2, &y2);
gimp_draw_tool_add_line (draw_tool, x1, y1, x2, y2);
}
}
/* draw the bounding box */
gimp_draw_tool_add_line (draw_tool,
tr_tool->tx1, tr_tool->ty1,
tr_tool->tx2, tr_tool->ty2);
gimp_draw_tool_add_line (draw_tool,
tr_tool->tx2, tr_tool->ty2,
tr_tool->tx4, tr_tool->ty4);
gimp_draw_tool_add_line (draw_tool,
tr_tool->tx3, tr_tool->ty3,
tr_tool->tx4, tr_tool->ty4);
gimp_draw_tool_add_line (draw_tool,
tr_tool->tx3, tr_tool->ty3,
tr_tool->tx1, tr_tool->ty1);
gimp_draw_tool_pop_group (draw_tool);
gimp_draw_tool_add_transform_guides (draw_tool,
&tr_tool->transform,
options->grid_type,
options->grid_size,
tr_tool->x1,
tr_tool->y1,
tr_tool->x2,
tr_tool->y2);
}
gimp_transform_tool_handles_recalc (tr_tool, tool->display,
@ -1327,91 +1279,6 @@ gimp_transform_tool_bounds (GimpTransformTool *tr_tool,
tr_tool->aspect = ((gdouble) (tr_tool->x2 - tr_tool->x1) /
(gdouble) (tr_tool->y2 - tr_tool->y1));
/* changing the bounds invalidates any grid we may have */
if (tr_tool->use_grid)
gimp_transform_tool_grid_recalc (tr_tool);
}
static void
gimp_transform_tool_grid_recalc (GimpTransformTool *tr_tool)
{
GimpTransformOptions *options = GIMP_TRANSFORM_TOOL_GET_OPTIONS (tr_tool);
if (tr_tool->grid_coords != NULL)
{
g_free (tr_tool->grid_coords);
tr_tool->grid_coords = NULL;
}
if (options->preview_type != GIMP_TRANSFORM_PREVIEW_TYPE_GRID &&
options->preview_type != GIMP_TRANSFORM_PREVIEW_TYPE_IMAGE_GRID)
return;
switch (options->grid_type)
{
case GIMP_GUIDES_N_LINES:
case GIMP_GUIDES_SPACING:
{
gint i, gci;
gdouble *coords;
gint width, height;
width = MAX (1, tr_tool->x2 - tr_tool->x1);
height = MAX (1, tr_tool->y2 - tr_tool->y1);
if (options->grid_type == GIMP_GUIDES_N_LINES)
{
if (width <= height)
{
tr_tool->ngx = options->grid_size;
tr_tool->ngy = tr_tool->ngx * MAX (1, height / width);
}
else
{
tr_tool->ngy = options->grid_size;
tr_tool->ngx = tr_tool->ngy * MAX (1, width / height);
}
}
else /* GIMP_GUIDES_SPACING */
{
gint grid_size = MAX (2, options->grid_size);
tr_tool->ngx = width / grid_size;
tr_tool->ngy = height / grid_size;
}
tr_tool->grid_coords = coords =
g_new (gdouble, (tr_tool->ngx + tr_tool->ngy) * 4);
gci = 0;
for (i = 1; i <= tr_tool->ngx; i++)
{
coords[gci] = tr_tool->x1 + (((gdouble) i) / (tr_tool->ngx + 1) *
(tr_tool->x2 - tr_tool->x1));
coords[gci + 1] = tr_tool->y1;
coords[gci + 2] = coords[gci];
coords[gci + 3] = tr_tool->y2;
gci += 4;
}
for (i = 1; i <= tr_tool->ngy; i++)
{
coords[gci] = tr_tool->x1;
coords[gci + 1] = tr_tool->y1 + (((gdouble) i) / (tr_tool->ngy + 1) *
(tr_tool->y2 - tr_tool->y1));
coords[gci + 2] = tr_tool->x2;
coords[gci + 3] = coords[gci + 1];
gci += 4;
}
}
default:
break;
}
}
static void

8
app/tools/gimptransformtool.h
View File

@ -87,14 +87,6 @@ struct _GimpTransformTool
gboolean use_center; /* uses the center handle */
gboolean use_mid_handles; /* use handles at midpoints of edges */
gint ngx, ngy; /* number of grid lines in original
* x and y directions
*/
gdouble *grid_coords; /* x and y coordinates of the grid
* endpoints (a total of (ngx+ngy)*2
* coordinate pairs)
*/
GimpCanvasItem *handles[TRANSFORM_HANDLE_CENTER + 1];
const gchar *undo_desc;