dnrops
/
gimp
mirror of https://github.com/GNOME/gimp.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity
gimp/app/display/gimpcanvastransformguides.c

684 lines
22 KiB
C
Raw Blame History

/* 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 <https://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 "core/gimp-utils.h"
#include "gimpcanvastransformguides.h"
#include "gimpdisplayshell.h"
#define SQRT5 2.236067977
enum
{
PROP_0,
PROP_TRANSFORM,
PROP_X1,
PROP_Y1,
PROP_X2,
PROP_Y2,
PROP_TYPE,
PROP_N_GUIDES,
PROP_CLIP
};
typedef struct _GimpCanvasTransformGuidesPrivate GimpCanvasTransformGuidesPrivate;
struct _GimpCanvasTransformGuidesPrivate
{
GimpMatrix3 transform;
gdouble x1, y1;
gdouble x2, y2;
GimpGuidesType type;
gint n_guides;
gboolean clip;
};
#define GET_PRIVATE(transform) \
((GimpCanvasTransformGuidesPrivate *) gimp_canvas_transform_guides_get_instance_private ((GimpCanvasTransformGuides *) (transform)))
/* 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,
cairo_t *cr);
static cairo_region_t * gimp_canvas_transform_guides_get_extents (GimpCanvasItem *item);
G_DEFINE_TYPE_WITH_PRIVATE (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_object_class_install_property (object_class, PROP_CLIP,
g_param_spec_boolean ("clip", NULL, NULL,
FALSE,
GIMP_PARAM_READWRITE));
}
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;
case PROP_CLIP:
private->clip = g_value_get_boolean (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;
case PROP_CLIP:
g_value_set_boolean (value, private->clip);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static gboolean
gimp_canvas_transform_guides_transform (GimpCanvasItem *item,
GimpVector2 *t_vertices,
gint *n_t_vertices)
{
GimpCanvasTransformGuidesPrivate *private = GET_PRIVATE (item);
GimpVector2 vertices[4];
vertices[0] = (GimpVector2) { private->x1, private->y1 };
vertices[1] = (GimpVector2) { private->x2, private->y1 };
vertices[2] = (GimpVector2) { private->x2, private->y2 };
vertices[3] = (GimpVector2) { private->x1, private->y2 };
if (private->clip)
{
gimp_transform_polygon (&private->transform, vertices, 4, TRUE,
t_vertices, n_t_vertices);
return TRUE;
}
else
{
gint i;
for (i = 0; i < 4; i++)
{
gimp_matrix3_transform_point (&private->transform,
vertices[i].x, vertices[i].y,
&t_vertices[i].x, &t_vertices[i].y);
}
*n_t_vertices = 4;
return gimp_transform_polygon_is_convex (t_vertices[0].x, t_vertices[0].y,
t_vertices[1].x, t_vertices[1].y,
t_vertices[3].x, t_vertices[3].y,
t_vertices[2].x, t_vertices[2].y);
}
}
static void
draw_line (cairo_t *cr,
GimpCanvasItem *item,
GimpMatrix3 *transform,
gdouble x1,
gdouble y1,
gdouble x2,
gdouble y2)
{
GimpCanvasTransformGuidesPrivate *private = GET_PRIVATE (item);
GimpVector2 vertices[2];
GimpVector2 t_vertices[2];
gint n_t_vertices;
vertices[0] = (GimpVector2) { x1, y1 };
vertices[1] = (GimpVector2) { x2, y2 };
if (private->clip)
{
gimp_transform_polygon (transform, vertices, 2, FALSE,
t_vertices, &n_t_vertices);
}
else
{
gint i;
for (i = 0; i < 2; i++)
{
gimp_matrix3_transform_point (transform,
vertices[i].x, vertices[i].y,
&t_vertices[i].x, &t_vertices[i].y);
}
n_t_vertices = 2;
}
if (n_t_vertices == 2)
{
gint i;
for (i = 0; i < 2; i++)
{
GimpVector2 v;
gimp_canvas_item_transform_xy_f (item,
t_vertices[i].x, t_vertices[i].y,
&v.x, &v.y);
v.x = floor (v.x) + 0.5;
v.y = floor (v.y) + 0.5;
if (i == 0)
cairo_move_to (cr, v.x, v.y);
else
cairo_line_to (cr, v.x, v.y);
}
}
}
static void
draw_hline (cairo_t *cr,
GimpCanvasItem *item,
GimpMatrix3 *transform,
gdouble x1,
gdouble x2,
gdouble y)
{
draw_line (cr, item, transform, x1, y, x2, y);
}
static void
draw_vline (cairo_t *cr,
GimpCanvasItem *item,
GimpMatrix3 *transform,
gdouble y1,
gdouble y2,
gdouble x)
{
draw_line (cr, item, transform, x, y1, x, y2);
}
static void
gimp_canvas_transform_guides_draw (GimpCanvasItem *item,
cairo_t *cr)
{
GimpCanvasTransformGuidesPrivate *private = GET_PRIVATE (item);
GimpVector2 t_vertices[5];
gint n_t_vertices;
gboolean convex;
gint i;
convex = gimp_canvas_transform_guides_transform (item,
t_vertices, &n_t_vertices);
if (n_t_vertices < 2)
return;
for (i = 0; i < n_t_vertices; i++)
{
GimpVector2 v;
gimp_canvas_item_transform_xy_f (item, t_vertices[i].x, t_vertices[i].y,
&v.x, &v.y);
v.x = floor (v.x) + 0.5;
v.y = floor (v.y) + 0.5;
if (i == 0)
cairo_move_to (cr, v.x, v.y);
else
cairo_line_to (cr, v.x, v.y);
}
cairo_close_path (cr);
if (! convex || n_t_vertices < 3)
{
_gimp_canvas_item_stroke (item, cr);
return;
}
switch (private->type)
{
case GIMP_GUIDES_NONE:
break;
case GIMP_GUIDES_CENTER_LINES:
draw_hline (cr, item, &private->transform,
private->x1, private->x2, (private->y1 + private->y2) / 2);
draw_vline (cr, item, &private->transform,
private->y1, private->y2, (private->x1 + private->x2) / 2);
break;
case GIMP_GUIDES_THIRDS:
draw_hline (cr, item, &private->transform,
private->x1, private->x2, (2 * private->y1 + private->y2) / 3);
draw_hline (cr, item, &private->transform,
private->x1, private->x2, (private->y1 + 2 * private->y2) / 3);
draw_vline (cr, item, &private->transform,
private->y1, private->y2, (2 * private->x1 + private->x2) / 3);
draw_vline (cr, item, &private->transform,
private->y1, private->y2, (private->x1 + 2 * private->x2) / 3);
break;
case GIMP_GUIDES_FIFTHS:
for (i = 0; i < 5; i++)
{
draw_hline (cr, item, &private->transform,
private->x1, private->x2,
private->y1 + i * (private->y2 - private->y1) / 5);
draw_vline (cr, item, &private->transform,
private->y1, private->y2,
private->x1 + i * (private->x2 - private->x1) / 5);
}
break;
case GIMP_GUIDES_GOLDEN:
draw_hline (cr, item, &private->transform,
private->x1, private->x2,
(2 * private->y1 + (1 + SQRT5) * private->y2) / (3 + SQRT5));
draw_hline (cr, item, &private->transform,
private->x1, private->x2,
((1 + SQRT5) * private->y1 + 2 * private->y2) / (3 + SQRT5));
draw_vline (cr, item, &private->transform,
private->y1, private->y2,
(2 * private->x1 + (1 + SQRT5) * private->x2) / (3 + SQRT5));
draw_vline (cr, item, &private->transform,
private->y1, private->y2,
((1 + SQRT5) * private->x1 + 2 * private->x2) / (3 + SQRT5));
break;
/* This code implements the method of diagonals discovered by
* Edwin Westhoff - see http://www.diagonalmethod.info/
*/
case GIMP_GUIDES_DIAGONALS:
{
/* the side of the largest square that can be
* fitted in whole into the rectangle (x1, y1), (x2, y2)
*/
const gdouble square_side = MIN (private->x2 - private->x1,
private->y2 - private->y1);
/* diagonal from the top-left edge */
draw_line (cr, item, &private->transform,
private->x1, private->y1,
private->x1 + square_side,
private->y1 + square_side);
/* diagonal from the top-right edge */
draw_line (cr, item, &private->transform,
private->x2, private->y1,
private->x2 - square_side,
private->y1 + square_side);
/* diagonal from the bottom-left edge */
draw_line (cr, item, &private->transform,
private->x1, private->y2,
private->x1 + square_side,
private->y2 - square_side);
/* diagonal from the bottom-right edge */
draw_line (cr, item, &private->transform,
private->x2, private->y2,
private->x2 - square_side,
private->y2 - square_side);
}
break;
case GIMP_GUIDES_N_LINES:
case GIMP_GUIDES_SPACING:
{
gint width, height;
gint ngx, ngy;
width = MAX (1, private->x2 - private->x1);
height = MAX (1, private->y2 - private->y1);
/* the MIN() in the code below limits the grid to one line
* every 5 image pixels, see bug 772667.
*/
if (private->type == GIMP_GUIDES_N_LINES)
{
if (width <= height)
{
ngx = private->n_guides;
ngx = MIN (ngx, width / 5);
ngy = ngx * MAX (1, height / width);
ngy = MIN (ngy, height / 5);
}
else
{
ngy = private->n_guides;
ngy = MIN (ngy, height / 5);
ngx = ngy * MAX (1, width / height);
ngx = MIN (ngx, width / 5);
}
}
else /* GIMP_GUIDES_SPACING */
{
gint grid_size = MAX (2, private->n_guides);
ngx = width / grid_size;
ngx = MIN (ngx, width / 5);
ngy = height / grid_size;
ngy = MIN (ngy, height / 5);
}
for (i = 1; i <= ngx; i++)
{
gdouble x = private->x1 + (((gdouble) i) / (ngx + 1) *
(private->x2 - private->x1));
draw_line (cr, item, &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, item, &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)
{
GimpVector2 t_vertices[5];
gint n_t_vertices;
GimpVector2 top_left;
GimpVector2 bottom_right;
cairo_rectangle_int_t extents;
gint i;
gimp_canvas_transform_guides_transform (item, t_vertices, &n_t_vertices);
if (n_t_vertices < 2)
return cairo_region_create ();
for (i = 0; i < n_t_vertices; i++)
{
GimpVector2 v;
gimp_canvas_item_transform_xy_f (item,
t_vertices[i].x, t_vertices[i].y,
&v.x, &v.y);
if (i == 0)
{
top_left = bottom_right = v;
}
else
{
top_left.x = MIN (top_left.x, v.x);
top_left.y = MIN (top_left.y, v.y);
bottom_right.x = MAX (bottom_right.x, v.x);
bottom_right.y = MAX (bottom_right.y, v.y);
}
}
extents.x = (gint) floor (top_left.x - 1.5);
extents.y = (gint) floor (top_left.y - 1.5);
extents.width = (gint) ceil (bottom_right.x + 1.5) - extents.x;
extents.height = (gint) ceil (bottom_right.y + 1.5) - 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,
gboolean clip)
{
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,
"clip", clip,
NULL);
}
void
gimp_canvas_transform_guides_set (GimpCanvasItem *guides,
const GimpMatrix3 *transform,
gdouble x1,
gdouble y1,
gdouble x2,
gdouble y2,
GimpGuidesType type,
gint n_guides,
gboolean clip)
{
g_return_if_fail (GIMP_IS_CANVAS_TRANSFORM_GUIDES (guides));
gimp_canvas_item_begin_change (guides);
g_object_set (guides,
"transform", transform,
"x1", x1,
"y1", y1,
"x2", x2,
"y2", y2,
"type", type,
"n-guides", n_guides,
"clip", clip,
NULL);
gimp_canvas_item_end_change (guides);
}
Reference in New Issue View Git Blame Copy Permalink