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gimp/app/tools/gimpunifiedtransformtool.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 <string.h>
#include <gegl.h>
#include <gtk/gtk.h>
#include "libgimpmath/gimpmath.h"
#include "libgimpwidgets/gimpwidgets.h"
#include "tools-types.h"
#include "core/gimp-transform-utils.h"
#include "core/gimp-utils.h"
#include "core/gimpchannel.h"
#include "core/gimpdrawable-transform.h"
#include "core/gimpimage.h"
#include "vectors/gimpstroke.h"
#include "vectors/gimpvectors.h"
#include "widgets/gimphelp-ids.h"
#include "display/gimpcanvasgroup.h"
#include "display/gimpcanvashandle.h"
#include "display/gimpdisplay.h"
#include "display/gimpdisplayshell.h"
#include "display/gimpdisplayshell-transform.h"
#include "display/gimptoolgui.h"
#include "gimptoolcontrol.h"
#include "gimptransformoptions.h"
#include "gimpunifiedtransformtool.h"
#include "gimp-intl.h"
/* index into trans_info array */
enum
{
X0,
Y0,
X1,
Y1,
X2,
Y2,
X3,
Y3,
PIVOT_X,
PIVOT_Y,
};
/* local function prototypes */
static void gimp_unified_transform_tool_dialog (GimpTransformTool *tr_tool);
static void gimp_unified_transform_tool_dialog_update (GimpTransformTool *tr_tool);
static void gimp_unified_transform_tool_prepare (GimpTransformTool *tr_tool);
static void gimp_unified_transform_tool_motion (GimpTransformTool *tr_tool);
static void gimp_unified_transform_tool_recalc_matrix (GimpTransformTool *tr_tool);
static gchar * gimp_unified_transform_tool_get_undo_desc (GimpTransformTool *tr_tool);
static TransformAction gimp_unified_transform_tool_pick_function (GimpTransformTool *tr_tool,
const GimpCoords *coords,
GdkModifierType state,
GimpDisplay *display);
static void gimp_unified_transform_tool_cursor_update (GimpTransformTool *tr_tool,
GimpCursorType *cursor,
GimpCursorModifier *modifier);
static void gimp_unified_transform_tool_draw_gui (GimpTransformTool *tr_tool,
gint handle_w,
gint handle_h);
G_DEFINE_TYPE (GimpUnifiedTransformTool, gimp_unified_transform_tool,
GIMP_TYPE_TRANSFORM_TOOL)
void
gimp_unified_transform_tool_register (GimpToolRegisterCallback callback,
gpointer data)
{
(* callback) (GIMP_TYPE_UNIFIED_TRANSFORM_TOOL,
GIMP_TYPE_TRANSFORM_OPTIONS,
gimp_transform_options_gui,
GIMP_CONTEXT_PROP_MASK_BACKGROUND,
"gimp-unified-transform-tool",
_("Unified Transform"),
_("Unified Transform Tool: "
"Transform the layer, selection or path"),
N_("_Unified Transform"), "<shift>L",
NULL, GIMP_HELP_TOOL_UNIFIED_TRANSFORM,
GIMP_ICON_TOOL_UNIFIED_TRANSFORM,
data);
}
static void
gimp_unified_transform_tool_class_init (GimpUnifiedTransformToolClass *klass)
{
GimpTransformToolClass *trans_class = GIMP_TRANSFORM_TOOL_CLASS (klass);
trans_class->dialog = gimp_unified_transform_tool_dialog;
trans_class->dialog_update = gimp_unified_transform_tool_dialog_update;
trans_class->prepare = gimp_unified_transform_tool_prepare;
trans_class->motion = gimp_unified_transform_tool_motion;
trans_class->recalc_matrix = gimp_unified_transform_tool_recalc_matrix;
trans_class->get_undo_desc = gimp_unified_transform_tool_get_undo_desc;
trans_class->pick_function = gimp_unified_transform_tool_pick_function;
trans_class->cursor_update = gimp_unified_transform_tool_cursor_update;
trans_class->draw_gui = gimp_unified_transform_tool_draw_gui;
}
static void
gimp_unified_transform_tool_init (GimpUnifiedTransformTool *unified_tool)
{
GimpTransformTool *tr_tool = GIMP_TRANSFORM_TOOL (unified_tool);
tr_tool->progress_text = _("Unified transform");
tr_tool->use_grid = TRUE;
tr_tool->use_corner_handles = TRUE;
tr_tool->does_perspective = TRUE;
}
static gboolean
transform_is_convex (GimpVector2 *pos)
{
return gimp_transform_polygon_is_convex (pos[0].x, pos[0].y,
pos[1].x, pos[1].y,
pos[2].x, pos[2].y,
pos[3].x, pos[3].y);
}
static inline gboolean
vectorisnull (GimpVector2 v)
{
return ((v.x == 0.0) && (v.y == 0.0));
}
static inline gdouble
dotprod (GimpVector2 a,
GimpVector2 b)
{
return a.x * b.x + a.y * b.y;
}
static inline gdouble
norm (GimpVector2 a)
{
return sqrt (dotprod (a, a));
}
static inline GimpVector2
vectorsubtract (GimpVector2 a,
GimpVector2 b)
{
GimpVector2 c;
c.x = a.x - b.x;
c.y = a.y - b.y;
return c;
}
static inline GimpVector2
vectoradd (GimpVector2 a,
GimpVector2 b)
{
GimpVector2 c;
c.x = a.x + b.x;
c.y = a.y + b.y;
return c;
}
static inline GimpVector2
scalemult (GimpVector2 a,
gdouble b)
{
GimpVector2 c;
c.x = a.x * b;
c.y = a.y * b;
return c;
}
static inline GimpVector2
vectorproject (GimpVector2 a,
GimpVector2 b)
{
return scalemult (b, dotprod (a, b) / dotprod (b, b));
}
/* finds the clockwise angle between the vectors given, 0-2π */
static inline gdouble
calcangle (GimpVector2 a,
GimpVector2 b)
{
gdouble angle, angle2;
gdouble length;
if (vectorisnull (a) || vectorisnull (b))
return 0.0;
length = norm (a) * norm (b);
angle = acos (dotprod (a, b)/length);
angle2 = b.y;
b.y = -b.x;
b.x = angle2;
angle2 = acos (dotprod (a, b)/length);
return ((angle2 > G_PI/2.) ? angle : 2*G_PI-angle);
}
static inline GimpVector2
rotate2d (GimpVector2 p,
gdouble angle)
{
GimpVector2 ret;
ret.x = cos (angle) * p.x-sin (angle) * p.y;
ret.y = sin (angle) * p.x+cos (angle) * p.y;
return ret;
}
static inline GimpVector2
lineintersect (GimpVector2 p1, GimpVector2 p2,
GimpVector2 q1, GimpVector2 q2)
{
gdouble denom, u;
GimpVector2 p;
denom = (q2.y - q1.y) * (p2.x - p1.x) - (q2.x - q1.x) * (p2.y - p1.y);
if (denom == 0.0)
{
p.x = (p1.x + p2.x + q1.x + q2.x) / 4;
p.y = (p1.y + p2.y + q1.y + q2.y) / 4;
}
else
{
u = (q2.x - q1.x) * (p1.y - q1.y) - (q2.y - q1.y) * (p1.x - q1.x);
u /= denom;
p.x = p1.x + u * (p2.x - p1.x);
p.y = p1.y + u * (p2.y - p1.y);
}
return p;
}
static inline GimpVector2
get_pivot_delta (GimpTransformTool *tr_tool,
GimpVector2 *oldpos,
GimpVector2 *newpos,
GimpVector2 pivot)
{
GimpMatrix3 transform_before, transform_after;
GimpVector2 delta;
gimp_matrix3_identity (&transform_before);
gimp_matrix3_identity (&transform_after);
gimp_transform_matrix_perspective (&transform_before,
tr_tool->x1,
tr_tool->y1,
tr_tool->x2 - tr_tool->x1,
tr_tool->y2 - tr_tool->y1,
oldpos[0].x, oldpos[0].y,
oldpos[1].x, oldpos[1].y,
oldpos[2].x, oldpos[2].y,
oldpos[3].x, oldpos[3].y);
gimp_transform_matrix_perspective (&transform_after,
tr_tool->x1,
tr_tool->y1,
tr_tool->x2 - tr_tool->x1,
tr_tool->y2 - tr_tool->y1,
newpos[0].x, newpos[0].y,
newpos[1].x, newpos[1].y,
newpos[2].x, newpos[2].y,
newpos[3].x, newpos[3].y);
gimp_matrix3_invert (&transform_before);
gimp_matrix3_mult (&transform_after, &transform_before);
gimp_matrix3_transform_point (&transform_before,
pivot.x, pivot.y, &delta.x, &delta.y);
delta = vectorsubtract (delta, pivot);
return delta;
}
static gboolean
point_is_inside_polygon (gint n,
gdouble *x,
gdouble *y,
gdouble px,
gdouble py)
{
gint i, j;
gboolean odd = FALSE;
for (i = 0, j = n - 1; i < n; j = i++)
{
if ((y[i] < py && y[j] >= py) ||
(y[j] < py && y[i] >= py))
{
if (x[i] + (py - y[i]) / (y[j] - y[i]) * (x[j] - x[i]) < px)
odd = !odd;
}
}
return odd;
}
static gboolean
point_is_inside_polygon_pos (GimpVector2 *pos,
GimpVector2 point)
{
return point_is_inside_polygon (4,
(gdouble[4]){ pos[0].x, pos[1].x,
pos[3].x, pos[2].x },
(gdouble[4]){ pos[0].y, pos[1].y,
pos[3].y, pos[2].y },
point.x, point.y);
}
static const gchar *
get_friendly_operation_name (TransformAction op)
{
switch (op)
{
case TRANSFORM_HANDLE_NONE:
return "";
case TRANSFORM_HANDLE_NW_P:
case TRANSFORM_HANDLE_NE_P:
case TRANSFORM_HANDLE_SW_P:
case TRANSFORM_HANDLE_SE_P:
return "Change perspective";
case TRANSFORM_HANDLE_NW:
case TRANSFORM_HANDLE_NE:
case TRANSFORM_HANDLE_SW:
case TRANSFORM_HANDLE_SE:
return "Scale";
case TRANSFORM_HANDLE_N:
case TRANSFORM_HANDLE_S:
case TRANSFORM_HANDLE_E:
case TRANSFORM_HANDLE_W:
return "Scale";
case TRANSFORM_HANDLE_CENTER:
return "Move";
case TRANSFORM_HANDLE_PIVOT:
return "Move pivot";
case TRANSFORM_HANDLE_N_S:
case TRANSFORM_HANDLE_S_S:
case TRANSFORM_HANDLE_E_S:
case TRANSFORM_HANDLE_W_S:
return "Shear";
case TRANSFORM_HANDLE_ROTATION:
return "Rotate";
default:
g_assert_not_reached ();
}
}
static TransformAction
gimp_unified_transform_tool_pick_function (GimpTransformTool *tr_tool,
const GimpCoords *coords,
GdkModifierType state,
GimpDisplay *display)
{
GimpTool *tool = GIMP_TOOL (tr_tool);
TransformAction ret = TRANSFORM_HANDLE_NONE;
TransformAction i;
for (i = TRANSFORM_HANDLE_NONE + 1; i < TRANSFORM_HANDLE_NUM; i++)
{
if (tr_tool->handles[i] &&
gimp_canvas_item_hit (tr_tool->handles[i], coords->x, coords->y))
{
ret = i;
break;
}
}
if (ret == TRANSFORM_HANDLE_NONE)
{
/* points passed in clockwise order */
if (point_is_inside_polygon (4,
(gdouble[4]){ tr_tool->tx1, tr_tool->tx2,
tr_tool->tx4, tr_tool->tx3 },
(gdouble[4]){ tr_tool->ty1, tr_tool->ty2,
tr_tool->ty4, tr_tool->ty3 },
coords->x, coords->y))
ret = TRANSFORM_HANDLE_CENTER;
else
ret = TRANSFORM_HANDLE_ROTATION;
}
gimp_tool_pop_status (tool, tool->display);
if (ret != TRANSFORM_HANDLE_NONE)
gimp_tool_push_status (tool, tool->display, "%s",
get_friendly_operation_name (ret));
return ret;
}
static void
get_handle_geometry (GimpTransformTool *tr_tool,
GimpVector2 *position,
gdouble *angle)
{
GimpVector2 o[] = { { .x = tr_tool->tx1, .y = tr_tool->ty1 },
{ .x = tr_tool->tx2, .y = tr_tool->ty2 },
{ .x = tr_tool->tx3, .y = tr_tool->ty3 },
{ .x = tr_tool->tx4, .y = tr_tool->ty4 } };
GimpVector2 right = { .x = 1.0, .y = 0.0 };
GimpVector2 up = { .x = 0.0, .y = 1.0 };
if (position)
{
position[0] = o[0];
position[1] = o[1];
position[2] = o[2];
position[3] = o[3];
}
angle[0] = calcangle (vectorsubtract (o[1], o[0]), right);
angle[1] = calcangle (vectorsubtract (o[3], o[2]), right);
angle[2] = calcangle (vectorsubtract (o[3], o[1]), up);
angle[3] = calcangle (vectorsubtract (o[2], o[0]), up);
angle[4] = (angle[0] + angle[3]) / 2.0;
angle[5] = (angle[0] + angle[2]) / 2.0;
angle[6] = (angle[1] + angle[3]) / 2.0;
angle[7] = (angle[1] + angle[2]) / 2.0;
}
static void
gimp_unified_transform_tool_cursor_update (GimpTransformTool *tr_tool,
GimpCursorType *cursor,
GimpCursorModifier *modifier)
{
GimpToolCursorType tool_cursor = GIMP_TOOL_CURSOR_NONE;
gdouble angle[8];
gint i;
GimpCursorType map[8];
GimpVector2 pos[4], this, that;
gboolean flip = FALSE;
gboolean side = FALSE;
gboolean set_cursor = TRUE;
map[0] = GIMP_CURSOR_CORNER_TOP_LEFT;
map[1] = GIMP_CURSOR_CORNER_TOP;
map[2] = GIMP_CURSOR_CORNER_TOP_RIGHT;
map[3] = GIMP_CURSOR_CORNER_RIGHT;
map[4] = GIMP_CURSOR_CORNER_BOTTOM_RIGHT;
map[5] = GIMP_CURSOR_CORNER_BOTTOM;
map[6] = GIMP_CURSOR_CORNER_BOTTOM_LEFT;
map[7] = GIMP_CURSOR_CORNER_LEFT;
get_handle_geometry (tr_tool, pos, angle);
for (i = 0; i < 8; i++)
angle[i] = round (angle[i] * 180.0 / G_PI / 45.0);
switch (tr_tool->function)
{
case TRANSFORM_HANDLE_NW_P:
case TRANSFORM_HANDLE_NW:
i = (gint) angle[4] + 0;
this = pos[0];
that = pos[3];
break;
case TRANSFORM_HANDLE_NE_P:
case TRANSFORM_HANDLE_NE:
i = (gint) angle[5] + 2;
this = pos[1];
that = pos[2];
break;
case TRANSFORM_HANDLE_SW_P:
case TRANSFORM_HANDLE_SW:
i = (gint) angle[6] + 6;
this = pos[2];
that = pos[1];
break;
case TRANSFORM_HANDLE_SE_P:
case TRANSFORM_HANDLE_SE:
i = (gint) angle[7] + 4;
this = pos[3];
that = pos[0];
break;
case TRANSFORM_HANDLE_N:
case TRANSFORM_HANDLE_N_S:
i = (gint) angle[0] + 1;
this = vectoradd (pos[0], pos[1]);
that = vectoradd (pos[2], pos[3]);
side = TRUE;
break;
case TRANSFORM_HANDLE_S:
case TRANSFORM_HANDLE_S_S:
i = (gint) angle[1] + 5;
this = vectoradd (pos[2], pos[3]);
that = vectoradd (pos[0], pos[1]);
side = TRUE;
break;
case TRANSFORM_HANDLE_E:
case TRANSFORM_HANDLE_E_S:
i = (gint) angle[2] + 3;
this = vectoradd (pos[1], pos[3]);
that = vectoradd (pos[0], pos[2]);
side = TRUE;
break;
case TRANSFORM_HANDLE_W:
case TRANSFORM_HANDLE_W_S:
i = (gint) angle[3] + 7;
this = vectoradd (pos[0], pos[2]);
that = vectoradd (pos[1], pos[3]);
side = TRUE;
break;
default:
set_cursor = FALSE;
break;
}
if (set_cursor)
{
i %= 8;
switch (map[i])
{
case GIMP_CURSOR_CORNER_TOP_LEFT:
if (this.x + this.y > that.x + that.y)
flip = TRUE;
break;
case GIMP_CURSOR_CORNER_TOP:
if (this.y > that.y)
flip = TRUE;
break;
case GIMP_CURSOR_CORNER_TOP_RIGHT:
if (this.x - this.y < that.x - that.y)
flip = TRUE;
break;
case GIMP_CURSOR_CORNER_RIGHT:
if (this.x < that.x)
flip = TRUE;
break;
case GIMP_CURSOR_CORNER_BOTTOM_RIGHT:
if (this.x + this.y < that.x + that.y)
flip = TRUE;
break;
case GIMP_CURSOR_CORNER_BOTTOM:
if (this.y < that.y)
flip = TRUE;
break;
case GIMP_CURSOR_CORNER_BOTTOM_LEFT:
if (this.x - this.y > that.x - that.y)
flip = TRUE;
break;
case GIMP_CURSOR_CORNER_LEFT:
if (this.x > that.x)
flip = TRUE;
break;
default:
g_assert_not_reached ();
}
if (flip)
*cursor = map[(i + 4) % 8];
else
*cursor = map[i];
if (side)
*cursor += 8;
}
/* parent class handles *cursor and *modifier for most handles */
switch (tr_tool->function)
{
case TRANSFORM_HANDLE_NONE:
case TRANSFORM_CREATING:
tool_cursor = GIMP_TOOL_CURSOR_NONE;
break;
case TRANSFORM_HANDLE_NW_P:
case TRANSFORM_HANDLE_NE_P:
case TRANSFORM_HANDLE_SW_P:
case TRANSFORM_HANDLE_SE_P:
tool_cursor = GIMP_TOOL_CURSOR_PERSPECTIVE;
break;
case TRANSFORM_HANDLE_NW:
case TRANSFORM_HANDLE_NE:
case TRANSFORM_HANDLE_SW:
case TRANSFORM_HANDLE_SE:
case TRANSFORM_HANDLE_N:
case TRANSFORM_HANDLE_S:
case TRANSFORM_HANDLE_E:
case TRANSFORM_HANDLE_W:
tool_cursor = GIMP_TOOL_CURSOR_RESIZE;
break;
case TRANSFORM_HANDLE_CENTER:
tool_cursor = GIMP_TOOL_CURSOR_MOVE;
break;
case TRANSFORM_HANDLE_PIVOT:
tool_cursor = GIMP_TOOL_CURSOR_ROTATE;
*modifier = GIMP_CURSOR_MODIFIER_MOVE;
break;
case TRANSFORM_HANDLE_N_S:
case TRANSFORM_HANDLE_S_S:
case TRANSFORM_HANDLE_E_S:
case TRANSFORM_HANDLE_W_S:
tool_cursor = GIMP_TOOL_CURSOR_SHEAR;
break;
case TRANSFORM_HANDLE_ROTATION:
tool_cursor = GIMP_TOOL_CURSOR_ROTATE;
break;
default:
g_assert_not_reached ();
}
/* parent class sets cursor and cursor_modifier */
gimp_tool_control_set_tool_cursor (GIMP_TOOL (tr_tool)->control, tool_cursor);
}
static void
gimp_unified_transform_tool_draw_gui (GimpTransformTool *tr_tool,
gint handle_w,
gint handle_h)
{
GimpDrawTool *draw_tool = GIMP_DRAW_TOOL (tr_tool);
GimpCanvasGroup *stroke_group;
gint d, i;
gdouble angle[8];
GimpVector2 o[4], t[4];
get_handle_geometry (tr_tool, o, angle);
for (i = 0; i < 4; i++)
{
GimpCanvasItem *h;
/* draw the scale handles */
h = gimp_draw_tool_add_handle (draw_tool,
GIMP_HANDLE_SQUARE,
o[i].x, o[i].y,
handle_w * 1.5, handle_h * 1.5,
GIMP_HANDLE_ANCHOR_CENTER);
gimp_canvas_handle_set_angles (h, angle[i + 4], 0.0);
tr_tool->handles[TRANSFORM_HANDLE_NW + i] = h;
/* draw the perspective handles */
h = gimp_draw_tool_add_handle (draw_tool,
GIMP_HANDLE_DIAMOND,
o[i].x, o[i].y,
handle_w * 0.8, handle_h * 0.8,
GIMP_HANDLE_ANCHOR_CENTER);
gimp_canvas_handle_set_angles (h, angle[i + 4], 0.0);
tr_tool->handles[TRANSFORM_HANDLE_NW_P + i] = h;
}
/* draw the side handles */
t[0] = scalemult (vectoradd (o[0], o[1]), 0.5);
t[1] = scalemult (vectoradd (o[2], o[3]), 0.5);
t[2] = scalemult (vectoradd (o[1], o[3]), 0.5);
t[3] = scalemult (vectoradd (o[2], o[0]), 0.5);
for (i = 0; i < 4; i++)
{
GimpCanvasItem *h;
h = gimp_draw_tool_add_handle (draw_tool,
GIMP_HANDLE_SQUARE,
t[i].x, t[i].y,
handle_w, handle_h,
GIMP_HANDLE_ANCHOR_CENTER);
gimp_canvas_handle_set_angles (h, angle[i], 0.0);
tr_tool->handles[TRANSFORM_HANDLE_N + i] = h;
}
/* draw the shear handles */
t[0] = scalemult (vectoradd ( o[0] , scalemult (o[1], 3.0)),
0.25);
t[1] = scalemult (vectoradd (scalemult (o[2], 3.0), o[3] ),
0.25);
t[2] = scalemult (vectoradd ( o[1] , scalemult (o[3], 3.0)),
0.25);
t[3] = scalemult (vectoradd (scalemult (o[2], 3.0), o[0] ),
0.25);
for (i = 0; i < 4; i++)
{
GimpCanvasItem *h;
h = gimp_draw_tool_add_handle (draw_tool,
GIMP_HANDLE_FILLED_DIAMOND,
t[i].x, t[i].y,
handle_w, handle_h,
GIMP_HANDLE_ANCHOR_CENTER);
gimp_canvas_handle_set_angles (h, angle[i], 0.0);
tr_tool->handles[TRANSFORM_HANDLE_N_S + i] = h;
}
/* draw the rotation center axis handle */
d = MIN (handle_w, handle_h);
stroke_group = gimp_draw_tool_add_stroke_group (draw_tool);
tr_tool->handles[TRANSFORM_HANDLE_PIVOT] = GIMP_CANVAS_ITEM (stroke_group);
gimp_draw_tool_push_group (draw_tool, stroke_group);
gimp_draw_tool_add_handle (draw_tool,
GIMP_HANDLE_CIRCLE,
tr_tool->tpx, tr_tool->tpy,
d, d,
GIMP_HANDLE_ANCHOR_CENTER);
gimp_draw_tool_add_handle (draw_tool,
GIMP_HANDLE_CROSS,
tr_tool->tpx, tr_tool->tpy,
d, d,
GIMP_HANDLE_ANCHOR_CENTER);
gimp_draw_tool_pop_group (draw_tool);
}
static void
gimp_unified_transform_tool_dialog (GimpTransformTool *tr_tool)
{
GimpUnifiedTransformTool *unified = GIMP_UNIFIED_TRANSFORM_TOOL (tr_tool);
GtkWidget *frame;
GtkWidget *table;
gint x, y;
frame = gimp_frame_new (_("Transform Matrix"));
gtk_box_pack_start (GTK_BOX (gimp_tool_gui_get_vbox (tr_tool->gui)), frame,
FALSE, FALSE, 0);
gtk_widget_show (frame);
table = gtk_table_new (3, 3, FALSE);
gtk_table_set_row_spacings (GTK_TABLE (table), 2);
gtk_table_set_col_spacings (GTK_TABLE (table), 2);
gtk_container_add (GTK_CONTAINER (frame), table);
gtk_widget_show (table);
for (y = 0; y < 3; y++)
for (x = 0; x < 3; x++)
{
GtkWidget *label = gtk_label_new (" ");
gtk_label_set_xalign (GTK_LABEL (label), 1.0);
gtk_label_set_width_chars (GTK_LABEL (label), 12);
gtk_table_attach (GTK_TABLE (table), label,
x, x + 1, y, y + 1, GTK_EXPAND, GTK_FILL, 0, 0);
gtk_widget_show (label);
unified->label[y][x] = label;
}
}
static void
gimp_unified_transform_tool_dialog_update (GimpTransformTool *tr_tool)
{
GimpUnifiedTransformTool *unified = GIMP_UNIFIED_TRANSFORM_TOOL (tr_tool);
gint x, y;
for (y = 0; y < 3; y++)
for (x = 0; x < 3; x++)
{
gchar buf[32];
g_snprintf (buf, sizeof (buf),
"%10.5f", tr_tool->transform.coeff[y][x]);
gtk_label_set_text (GTK_LABEL (unified->label[y][x]), buf);
}
}
static void
gimp_unified_transform_tool_prepare (GimpTransformTool *tr_tool)
{
tr_tool->trans_info[PIVOT_X] = (gdouble) (tr_tool->x1 + tr_tool->x2) / 2.0;
tr_tool->trans_info[PIVOT_Y] = (gdouble) (tr_tool->y1 + tr_tool->y2) / 2.0;
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->y1;
tr_tool->trans_info[X2] = (gdouble) tr_tool->x1;
tr_tool->trans_info[Y2] = (gdouble) tr_tool->y2;
tr_tool->trans_info[X3] = (gdouble) tr_tool->x2;
tr_tool->trans_info[Y3] = (gdouble) tr_tool->y2;
}
static void
gimp_unified_transform_tool_motion (GimpTransformTool *transform_tool)
{
GimpTransformOptions *options = GIMP_TRANSFORM_TOOL_GET_OPTIONS (transform_tool);
gdouble *x[4], *y[4];
gdouble *newpivot_x, *newpivot_y;
GimpVector2 oldpos[5], newpos[4];
GimpVector2 cur = { .x = transform_tool->curx,
.y = transform_tool->cury };
GimpVector2 mouse = { .x = transform_tool->mousex,
.y = transform_tool->mousey };
GimpVector2 d;
GimpVector2 pivot;
gint i;
gboolean fixedpivot = options->fixedpivot;
TransformAction function = transform_tool->function;
for (i = 0; i < 4; i++)
{
x[i] = &transform_tool->trans_info[X0 + i * 2];
y[i] = &transform_tool->trans_info[Y0 + i * 2];
newpos[i].x = oldpos[i].x = transform_tool->prev_trans_info[0][X0 + i * 2];
newpos[i].y = oldpos[i].y = transform_tool->prev_trans_info[0][Y0 + i * 2];
}
/* put center point in this array too */
oldpos[4].x = (oldpos[0].x + oldpos[1].x + oldpos[2].x + oldpos[3].x) / 4.;
oldpos[4].y = (oldpos[0].y + oldpos[1].y + oldpos[2].y + oldpos[3].y) / 4.;
d = vectorsubtract (cur, mouse);
newpivot_x = &transform_tool->trans_info[PIVOT_X];
newpivot_y = &transform_tool->trans_info[PIVOT_Y];
pivot.x = transform_tool->prev_trans_info[0][PIVOT_X];
pivot.y = transform_tool->prev_trans_info[0][PIVOT_Y];
/* move */
if (function == TRANSFORM_HANDLE_CENTER)
{
if (options->constrain_move)
{
/* snap to 45 degree vectors from starting point */
gdouble angle = 16.0 * calcangle ((GimpVector2) { 1.0, 0.0 },
d) / (2.0 * G_PI);
gdouble dist = norm (d) / sqrt (2);
if (angle < 1. || angle >= 15.)
d.y = 0;
else if (angle < 3.)
d.y = -(d.x = dist);
else if (angle < 5.)
d.x = 0;
else if (angle < 7.)
d.x = d.y = -dist;
else if (angle < 9.)
d.y = 0;
else if (angle < 11.)
d.x = -(d.y = dist);
else if (angle < 13.)
d.x = 0;
else if (angle < 15.)
d.x = d.y = dist;
}
for (i = 0; i < 4; i++)
newpos[i] = vectoradd (oldpos[i], d);
}
/* rotate */
if (function == TRANSFORM_HANDLE_ROTATION)
{
gdouble angle = calcangle (vectorsubtract (cur, pivot),
vectorsubtract (mouse, pivot));
if (options->constrain_rotate)
{
/* round to 15 degree multiple */
angle /= 2*G_PI/24.;
angle = round (angle);
angle *= 2*G_PI/24.;
}
for (i = 0; i < 4; i++)
newpos[i] = vectoradd (pivot,
rotate2d (vectorsubtract (oldpos[i], pivot),
angle));
fixedpivot = TRUE;
}
/* move rotation axis */
if (function == TRANSFORM_HANDLE_PIVOT)
{
pivot = vectoradd (pivot, d);
if (options->cornersnap)
{
/* snap to corner points and center */
gint closest = 0;
gdouble closest_dist = G_MAXDOUBLE, dist;
for (i = 0; i < 5; i++)
{
dist = norm (vectorsubtract (pivot, oldpos[i]));
if (dist < closest_dist)
{
closest_dist = dist;
closest = i;
}
}
if (closest_dist *
gimp_display_get_shell (GIMP_TOOL (transform_tool)->display)->scale_x < 50)
{
pivot = oldpos[closest];
}
}
fixedpivot = TRUE;
}
/* scaling via corner */
if (function == TRANSFORM_HANDLE_NW ||
function == TRANSFORM_HANDLE_NE ||
function == TRANSFORM_HANDLE_SE ||
function == TRANSFORM_HANDLE_SW)
{
/* Scaling through scale handles means translating one corner point,
* with all sides at constant angles.
*/
gint this, left, right, opposite;
/* 0: northwest, 1: northeast, 2: southwest, 3: southeast */
if (function == TRANSFORM_HANDLE_NW)
{
this = 0; left = 1; right = 2; opposite = 3;
}
else if (function == TRANSFORM_HANDLE_NE)
{
this = 1; left = 3; right = 0; opposite = 2;
}
else if (function == TRANSFORM_HANDLE_SW)
{
this = 2; left = 0; right = 3; opposite = 1;
}
else if (function == TRANSFORM_HANDLE_SE)
{
this = 3; left = 2; right = 1; opposite = 0;
}
else
g_assert_not_reached ();
/* when the keep aspect transformation constraint is enabled,
* the translation shall only be along the diagonal that runs
* trough this corner point.
*/
if (options->constrain_scale)
{
/* restrict to movement along the diagonal */
GimpVector2 diag = vectorsubtract (oldpos[this], oldpos[opposite]);
d = vectorproject (d, diag);
}
/* Move the corner being interacted with */
/* rp---------tp
* / /\ <- d, the interaction vector
* / / tp
* op----------/
*
*/
newpos[this] = vectoradd (oldpos[this], d);
/* Where the corner to the right and left would go, need these to form
* lines to intersect with the sides */
/* rp----------/
* /\ /\
* / nr / nt
* op----------lp
* \
* nl
*/
newpos[right] = vectoradd (oldpos[right], d);
newpos[left] = vectoradd (oldpos[left], d);
/* Now we just need to find the intersection of op-rp and nr-nt.
* rp----------/
* / /
* / nr==========nt
* op----------/
*
*/
newpos[right] = lineintersect (newpos[right], newpos[this],
oldpos[opposite], oldpos[right]);
newpos[left] = lineintersect (newpos[left], newpos[this],
oldpos[opposite], oldpos[left]);
/* /-----------/
* / /
* rp============nt
* op----------/
*
*/
/*
*
* /--------------/
* /--------------/
*
*/
if (options->frompivot_scale &&
transform_is_convex (newpos) &&
transform_is_convex (oldpos))
{
/* transform the pivot point before the interaction and
* after, and move everything by this difference
*/
//TODO the handle doesn't actually end up where the mouse cursor is
GimpVector2 delta = get_pivot_delta (transform_tool,
oldpos, newpos, pivot);
for (i = 0; i < 4; i++)
newpos[i] = vectorsubtract (newpos[i], delta);
fixedpivot = TRUE;
}
}
/* scaling via sides */
if (function == TRANSFORM_HANDLE_N ||
function == TRANSFORM_HANDLE_E ||
function == TRANSFORM_HANDLE_S ||
function == TRANSFORM_HANDLE_W)
{
gint this_l, this_r, opp_l, opp_r;
GimpVector2 side_l, side_r, midline;
/* 0: northwest, 1: northeast, 2: southwest, 3: southeast */
if (function == TRANSFORM_HANDLE_N)
{
this_l = 1; this_r = 0;
}
else if (function == TRANSFORM_HANDLE_E)
{
this_l = 3; this_r = 1;
}
else if (function == TRANSFORM_HANDLE_S)
{
this_l = 2; this_r = 3;
}
else if (function == TRANSFORM_HANDLE_W)
{
this_l = 0; this_r = 2;
}
else
g_assert_not_reached ();
opp_l = 3 - this_r; opp_r = 3 - this_l;
side_l = vectorsubtract (oldpos[opp_l], oldpos[this_l]);
side_r = vectorsubtract (oldpos[opp_r], oldpos[this_r]);
midline = vectoradd (side_l, side_r);
/* restrict to movement along the midline */
d = vectorproject (d, midline);
if (options->constrain_scale)
{
GimpVector2 before, after, effective_pivot = pivot;
gdouble distance;
if (! options->frompivot_scale)
{
/* center of the opposite side is pivot */
effective_pivot = scalemult (vectoradd (oldpos[opp_l],
oldpos[opp_r]), 0.5);
}
/* get the difference between the distance from the pivot to
* where interaction started and the distance from the pivot
* to where cursor is now, and scale all corners distance
* from the pivot with this factor
*/
before = vectorsubtract (effective_pivot, mouse);
after = vectorsubtract (effective_pivot, cur);
after = vectorproject (after, before);
distance = 0.5 * (after.x / before.x + after.y / before.y);
for (i = 0; i < 4; i++)
newpos[i] = vectoradd (effective_pivot,
scalemult (vectorsubtract (oldpos[i],
effective_pivot),
distance));
}
else
{
/* just move the side */
newpos[this_l] = vectoradd (oldpos[this_l], d);
newpos[this_r] = vectoradd (oldpos[this_r], d);
}
if (! options->constrain_scale &&
options->frompivot_scale &&
transform_is_convex (newpos) &&
transform_is_convex (oldpos))
{
GimpVector2 delta = get_pivot_delta (transform_tool,
oldpos, newpos, pivot);
for (i = 0; i < 4; i++)
newpos[i] = vectorsubtract (newpos[i], delta);
fixedpivot = TRUE;
}
}
/* shear */
if (function == TRANSFORM_HANDLE_N_S ||
function == TRANSFORM_HANDLE_E_S ||
function == TRANSFORM_HANDLE_S_S ||
function == TRANSFORM_HANDLE_W_S)
{
gint this_l, this_r;
/* set up indices for this edge and the opposite edge */
if (function == TRANSFORM_HANDLE_N_S)
{
this_l = 1; this_r = 0;
}
else if (function == TRANSFORM_HANDLE_W_S)
{
this_l = 0; this_r = 2;
}
else if (function == TRANSFORM_HANDLE_S_S)
{
this_l = 2; this_r = 3;
}
else if (function == TRANSFORM_HANDLE_E_S)
{
this_l = 3; this_r = 1;
}
else
g_assert_not_reached ();
if (options->constrain_shear)
{
/* restrict to movement along the side */
GimpVector2 side = vectorsubtract (oldpos[this_r], oldpos[this_l]);
d = vectorproject (d, side);
}
newpos[this_l] = vectoradd (oldpos[this_l], d);
newpos[this_r] = vectoradd (oldpos[this_r], d);
if (options->frompivot_shear &&
transform_is_convex (newpos) &&
transform_is_convex (oldpos))
{
GimpVector2 delta = get_pivot_delta (transform_tool,
oldpos, newpos, pivot);
for (i = 0; i < 4; i++)
newpos[i] = vectorsubtract (newpos[i], delta);
fixedpivot = TRUE;
}
}
/* perspective transform */
if (function == TRANSFORM_HANDLE_NW_P ||
function == TRANSFORM_HANDLE_NE_P ||
function == TRANSFORM_HANDLE_SE_P ||
function == TRANSFORM_HANDLE_SW_P)
{
gint this, left, right, opposite;
/* 0: northwest, 1: northeast, 2: southwest, 3: southeast */
if (function == TRANSFORM_HANDLE_NW_P)
{
this = 0; left = 1; right = 2; opposite = 3;
}
else if (function == TRANSFORM_HANDLE_NE_P)
{
this = 1; left = 3; right = 0; opposite = 2;
}
else if (function == TRANSFORM_HANDLE_SW_P)
{
this = 2; left = 0; right = 3; opposite = 1;
}
else if (function == TRANSFORM_HANDLE_SE_P)
{
this = 3; left = 2; right = 1; opposite = 0;
}
else
g_assert_not_reached ();
if (options->constrain_perspective)
{
/* when the constrain transformation constraint is enabled,
* the translation shall only be either along the side
* angles of the two sides that run to this corner point, or
* along the diagonal that runs trough this corner point.
*/
GimpVector2 proj[4];
gdouble rej[4];
for (i = 0; i < 4; i++)
{
if (i == this)
continue;
/* get the vectors along the sides and the diagonal */
proj[i] = vectorsubtract (oldpos[this], oldpos[i]);
/* project d on each candidate vector and see which has
* the shortest rejection
*/
proj[i] = vectorproject (d, proj[i]);
rej[i] = norm (vectorsubtract (d, proj[i]));
}
if (rej[left] < rej[right] && rej[left] < rej[opposite])
d = proj[left];
else if (rej[right] < rej[opposite])
d = proj[right];
else
d = proj[opposite];
}
newpos[this] = vectoradd (oldpos[this], d);
if (options->frompivot_perspective &&
transform_is_convex (newpos) &&
transform_is_convex (oldpos))
{
GimpVector2 delta = get_pivot_delta (transform_tool,
oldpos, newpos, pivot);
for (i = 0; i < 4; i++)
newpos[i] = vectorsubtract (newpos[i], delta);
fixedpivot = TRUE;
}
}
for (i = 0; i < 4; i++)
{
*x[i] = newpos[i].x;
*y[i] = newpos[i].y;
}
/* this will have been set to TRUE if an operation used the pivot in
* addition to being a user option
*/
if (! fixedpivot &&
transform_is_convex (newpos) &&
transform_is_convex (oldpos) &&
point_is_inside_polygon_pos (oldpos, pivot))
{
GimpVector2 delta = get_pivot_delta (transform_tool,
oldpos, newpos, pivot);
pivot = vectoradd (pivot, delta);
}
/* set unconditionally: if options get toggled during operation, we
* have to move pivot back
*/
*newpivot_x = pivot.x;
*newpivot_y = pivot.y;
}
static void
gimp_unified_transform_tool_recalc_matrix (GimpTransformTool *tr_tool)
{
tr_tool->px = tr_tool->trans_info[PIVOT_X];
tr_tool->py = tr_tool->trans_info[PIVOT_Y];
gimp_matrix3_identity (&tr_tool->transform);
gimp_transform_matrix_perspective (&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[Y1],
tr_tool->trans_info[X2],
tr_tool->trans_info[Y2],
tr_tool->trans_info[X3],
tr_tool->trans_info[Y3]);
}
static gchar *
gimp_unified_transform_tool_get_undo_desc (GimpTransformTool *tr_tool)
{
return g_strdup (C_("undo-type", "Unified Transform"));
}
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