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gimp/app/tools/gimpdrawtool.c

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/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995-2001 Spencer Kimball, Peter Mattis, and others
*
* 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 "tools-types.h"
#include "core/gimpimage.h"
#include "vectors/gimpanchor.h"
#include "vectors/gimpstroke.h"
#include "vectors/gimpvectors.h"
#include "display/gimpcanvas.h"
#include "display/gimpcanvasarc.h"
#include "display/gimpcanvasboundary.h"
#include "display/gimpcanvascorner.h"
#include "display/gimpcanvasguide.h"
#include "display/gimpcanvashandle.h"
#include "display/gimpcanvasline.h"
#include "display/gimpcanvaspolygon.h"
#include "display/gimpcanvasrectangle.h"
#include "display/gimpcanvastextcursor.h"
#include "display/gimpdisplay.h"
#include "display/gimpdisplayshell.h"
#include "display/gimpdisplayshell-transform.h"
#include "gimpdrawtool.h"
static void gimp_draw_tool_dispose (GObject *object);
static gboolean gimp_draw_tool_has_display (GimpTool *tool,
GimpDisplay *display);
static GimpDisplay * gimp_draw_tool_has_image (GimpTool *tool,
GimpImage *image);
static void gimp_draw_tool_control (GimpTool *tool,
GimpToolAction action,
GimpDisplay *display);
static void gimp_draw_tool_draw (GimpDrawTool *draw_tool);
static void gimp_draw_tool_undraw (GimpDrawTool *draw_tool);
static void gimp_draw_tool_real_draw (GimpDrawTool *draw_tool);
static inline void gimp_draw_tool_shift_to_north_west
(gdouble x,
gdouble y,
gint handle_width,
gint handle_height,
GtkAnchorType anchor,
gdouble *shifted_x,
gdouble *shifted_y);
static inline void gimp_draw_tool_shift_to_center
(gdouble x,
gdouble y,
gint handle_width,
gint handle_height,
GtkAnchorType anchor,
gdouble *shifted_x,
gdouble *shifted_y);
G_DEFINE_TYPE (GimpDrawTool, gimp_draw_tool, GIMP_TYPE_TOOL)
#define parent_class gimp_draw_tool_parent_class
static void
gimp_draw_tool_class_init (GimpDrawToolClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GimpToolClass *tool_class = GIMP_TOOL_CLASS (klass);
object_class->dispose = gimp_draw_tool_dispose;
tool_class->has_display = gimp_draw_tool_has_display;
tool_class->has_image = gimp_draw_tool_has_image;
tool_class->control = gimp_draw_tool_control;
klass->draw = gimp_draw_tool_real_draw;
}
static void
gimp_draw_tool_init (GimpDrawTool *draw_tool)
{
draw_tool->display = NULL;
draw_tool->paused_count = 0;
draw_tool->items = NULL;
}
static void
gimp_draw_tool_dispose (GObject *object)
{
G_OBJECT_CLASS (parent_class)->dispose (object);
}
static gboolean
gimp_draw_tool_has_display (GimpTool *tool,
GimpDisplay *display)
{
GimpDrawTool *draw_tool = GIMP_DRAW_TOOL (tool);
return (display == draw_tool->display ||
GIMP_TOOL_CLASS (parent_class)->has_display (tool, display));
}
static GimpDisplay *
gimp_draw_tool_has_image (GimpTool *tool,
GimpImage *image)
{
GimpDrawTool *draw_tool = GIMP_DRAW_TOOL (tool);
GimpDisplay *display;
display = GIMP_TOOL_CLASS (parent_class)->has_image (tool, image);
if (! display && draw_tool->display)
{
if (image && gimp_display_get_image (draw_tool->display) == image)
display = draw_tool->display;
/* NULL image means any display */
if (! image)
display = draw_tool->display;
}
return display;
}
static void
gimp_draw_tool_control (GimpTool *tool,
GimpToolAction action,
GimpDisplay *display)
{
GimpDrawTool *draw_tool = GIMP_DRAW_TOOL (tool);
switch (action)
{
case GIMP_TOOL_ACTION_PAUSE:
case GIMP_TOOL_ACTION_RESUME:
break;
case GIMP_TOOL_ACTION_HALT:
gimp_draw_tool_stop (draw_tool);
break;
}
GIMP_TOOL_CLASS (parent_class)->control (tool, action, display);
}
static void
gimp_draw_tool_add_item (GimpDrawTool *draw_tool,
GimpCanvasItem *item)
{
draw_tool->items = g_list_append (draw_tool->items, g_object_ref (item));
}
static void
gimp_draw_tool_clear_items (GimpDrawTool *draw_tool)
{
if (draw_tool->items)
{
g_list_foreach (draw_tool->items, (GFunc) g_object_unref, NULL);
g_list_free (draw_tool->items);
draw_tool->items = NULL;
}
}
static void
gimp_draw_tool_invalidate_items (GimpDrawTool *draw_tool)
{
GimpDisplayShell *shell = gimp_display_get_shell (draw_tool->display);
GdkWindow *window = gtk_widget_get_window (shell->canvas);
GList *list;
for (list = draw_tool->items; list; list = g_list_next (list))
{
GimpCanvasItem *item = list->data;
GdkRegion *region;
region = gimp_canvas_item_get_extents (item, shell);
gdk_window_invalidate_region (window, region, TRUE);
gdk_region_destroy (region);
}
}
static void
gimp_draw_tool_draw (GimpDrawTool *draw_tool)
{
if (draw_tool->display && draw_tool->paused_count == 0)
{
gimp_draw_tool_invalidate_items (draw_tool);
gimp_draw_tool_clear_items (draw_tool);
GIMP_DRAW_TOOL_GET_CLASS (draw_tool)->draw (draw_tool);
gimp_draw_tool_invalidate_items (draw_tool);
}
}
static void
gimp_draw_tool_undraw (GimpDrawTool *draw_tool)
{
if (draw_tool->display)
{
gimp_draw_tool_invalidate_items (draw_tool);
gimp_draw_tool_clear_items (draw_tool);
}
}
static void
gimp_draw_tool_real_draw (GimpDrawTool *draw_tool)
{
/* the default implementation does nothing */
}
void
gimp_draw_tool_start (GimpDrawTool *draw_tool,
GimpDisplay *display)
{
g_return_if_fail (GIMP_IS_DRAW_TOOL (draw_tool));
g_return_if_fail (GIMP_IS_DISPLAY (display));
gimp_draw_tool_stop (draw_tool);
draw_tool->display = display;
gimp_draw_tool_draw (draw_tool);
}
void
gimp_draw_tool_stop (GimpDrawTool *draw_tool)
{
g_return_if_fail (GIMP_IS_DRAW_TOOL (draw_tool));
gimp_draw_tool_undraw (draw_tool);
draw_tool->display = NULL;
}
gboolean
gimp_draw_tool_is_active (GimpDrawTool *draw_tool)
{
g_return_val_if_fail (GIMP_IS_DRAW_TOOL (draw_tool), FALSE);
return draw_tool->display != NULL;
}
void
gimp_draw_tool_pause (GimpDrawTool *draw_tool)
{
g_return_if_fail (GIMP_IS_DRAW_TOOL (draw_tool));
draw_tool->paused_count++;
}
void
gimp_draw_tool_resume (GimpDrawTool *draw_tool)
{
g_return_if_fail (GIMP_IS_DRAW_TOOL (draw_tool));
g_return_if_fail (draw_tool->paused_count > 0);
draw_tool->paused_count--;
gimp_draw_tool_draw (draw_tool);
}
void
gimp_draw_tool_draw_items (GimpDrawTool *draw_tool,
cairo_t *cr)
{
GimpDisplayShell *shell;
GdkWindow *window;
GList *list;
g_return_if_fail (GIMP_IS_DRAW_TOOL (draw_tool));
g_return_if_fail (cr != NULL);
if (! gimp_draw_tool_is_active (draw_tool) ||
draw_tool->paused_count > 0)
return;
shell = gimp_display_get_shell (draw_tool->display);
window = gtk_widget_get_window (shell->canvas);
for (list = draw_tool->items; list; list = g_list_next (list))
{
GimpCanvasItem *item = list->data;
gimp_canvas_item_draw (item, shell, cr);
}
}
/**
* gimp_draw_tool_calc_distance:
* @draw_tool: a #GimpDrawTool
* @display: a #GimpDisplay
* @x1: start point X in image coordinates
* @y1: start point Y in image coordinates
* @x2: end point X in image coordinates
* @y2: end point Y in image coordinates
*
* If you just need to compare distances, consider to use
* gimp_draw_tool_calc_distance_square() instead.
*
* Returns: the distance between the given points in display coordinates
**/
gdouble
gimp_draw_tool_calc_distance (GimpDrawTool *draw_tool,
GimpDisplay *display,
gdouble x1,
gdouble y1,
gdouble x2,
gdouble y2)
{
return sqrt (gimp_draw_tool_calc_distance_square (draw_tool, display,
x1, y1, x2, y2));
}
/**
* gimp_draw_tool_calc_distance_square:
* @draw_tool: a #GimpDrawTool
* @display: a #GimpDisplay
* @x1: start point X in image coordinates
* @y1: start point Y in image coordinates
* @x2: end point X in image coordinates
* @y2: end point Y in image coordinates
*
* This function is more effective than gimp_draw_tool_calc_distance()
* as it doesn't perform a sqrt(). Use this if you just need to compare
* distances.
*
* Returns: the square of the distance between the given points in
* display coordinates
**/
gdouble
gimp_draw_tool_calc_distance_square (GimpDrawTool *draw_tool,
GimpDisplay *display,
gdouble x1,
gdouble y1,
gdouble x2,
gdouble y2)
{
GimpDisplayShell *shell;
gdouble tx1, ty1;
gdouble tx2, ty2;
g_return_val_if_fail (GIMP_IS_DRAW_TOOL (draw_tool), 0.0);
g_return_val_if_fail (GIMP_IS_DISPLAY (display), 0.0);
shell = gimp_display_get_shell (display);
gimp_display_shell_transform_xy_f (shell, x1, y1, &tx1, &ty1);
gimp_display_shell_transform_xy_f (shell, x2, y2, &tx2, &ty2);
return SQR (tx2 - tx1) + SQR (ty2 - ty1);
}
/**
* gimp_draw_tool_in_radius:
* @draw_tool: a #GimpDrawTool
* @display: a #GimpDisplay
* @x1: start point X in image coordinates
* @y1: start point Y in image coordinates
* @x2: end point X in image coordinates
* @y2: end point Y in image coordinates
* @radius: distance in screen coordinates, not image coordinates
*
* The points are in image space coordinates.
*
* Returns: %TRUE if the points are within radius of each other,
* %FALSE otherwise
**/
gboolean
gimp_draw_tool_in_radius (GimpDrawTool *draw_tool,
GimpDisplay *display,
gdouble x1,
gdouble y1,
gdouble x2,
gdouble y2,
gint radius)
{
return (gimp_draw_tool_calc_distance_square (draw_tool, display,
x1, y1, x2, y2) < SQR (radius));
}
/**
* gimp_draw_tool_draw_line:
* @draw_tool: the #GimpDrawTool
* @x1: start point X in image coordinates
* @y1: start point Y in image coordinates
* @x2: end point X in image coordinates
* @y2: end point Y in image coordinates
*
* This function takes image space coordinates and transforms them to
* screen window coordinates, then draws a line between the resulting
* coordindates.
**/
void
gimp_draw_tool_draw_line (GimpDrawTool *draw_tool,
gdouble x1,
gdouble y1,
gdouble x2,
gdouble y2)
{
GimpCanvasItem *item;
g_return_if_fail (GIMP_IS_DRAW_TOOL (draw_tool));
item = gimp_canvas_line_new (x1, y1, x2, y2);
gimp_draw_tool_add_item (draw_tool, item);
g_object_unref (item);
}
/**
* gimp_draw_tool_draw_dashed_line:
* @draw_tool: the #GimpDrawTool
* @x1: start point X in image coordinates
* @y1: start point Y in image coordinates
* @x2: end point X in image coordinates
* @y2: end point Y in image coordinates
*
* This function takes image space coordinates and transforms them to
* screen window coordinates, then draws a dashed line between the
* resulting coordindates.
**/
void
gimp_draw_tool_draw_dashed_line (GimpDrawTool *draw_tool,
gdouble x1,
gdouble y1,
gdouble x2,
gdouble y2)
{
GimpCanvasItem *item;
g_return_if_fail (GIMP_IS_DRAW_TOOL (draw_tool));
item = gimp_canvas_line_new (x1, y1, x2, y2);
gimp_canvas_item_set_highlight (item, TRUE);
gimp_draw_tool_add_item (draw_tool, item);
g_object_unref (item);
}
/**
* gimp_draw_tool_draw_guide:
* @draw_tool: the #GimpDrawTool
* @orientation: the orientation of the guide line
* @position: the position of the guide line in image coordinates
*
* This function draws a guide line across the canvas.
**/
void
gimp_draw_tool_draw_guide_line (GimpDrawTool *draw_tool,
GimpOrientationType orientation,
gint position)
{
GimpCanvasItem *item;
g_return_if_fail (GIMP_IS_DRAW_TOOL (draw_tool));
item = gimp_canvas_guide_new (orientation, position);
gimp_draw_tool_add_item (draw_tool, item);
g_object_unref (item);
}
/**
* gimp_draw_tool_draw_rectangle:
* @draw_tool: the #GimpDrawTool
* @filled: whether to fill the rectangle
* @x: horizontal image coordinate
* @y: vertical image coordinate
* @width: width in image coordinates
* @height: height in image coordinates
*
* This function takes image space coordinates and transforms them to
* screen window coordinates, then draws the resulting rectangle.
**/
void
gimp_draw_tool_draw_rectangle (GimpDrawTool *draw_tool,
gboolean filled,
gdouble x,
gdouble y,
gdouble width,
gdouble height)
{
GimpCanvasItem *item;
g_return_if_fail (GIMP_IS_DRAW_TOOL (draw_tool));
item = gimp_canvas_rectangle_new (x, y, width, height, filled);
gimp_draw_tool_add_item (draw_tool, item);
g_object_unref (item);
}
void
gimp_draw_tool_draw_arc (GimpDrawTool *draw_tool,
gboolean filled,
gdouble x,
gdouble y,
gdouble width,
gdouble height,
gint angle1,
gint angle2)
{
GimpCanvasItem *item;
gdouble a1, a2;
g_return_if_fail (GIMP_IS_DRAW_TOOL (draw_tool));
a1 = (gdouble) angle1 / 64.0 / 180.0 * G_PI;
a2 = (gdouble) angle2 / 64.0 / 180.0 * G_PI;
item = gimp_canvas_arc_new (x + width / 2.0,
y + height / 2.0,
width / 2.0,
height / 2.0,
a1, a2,
FALSE);
gimp_draw_tool_add_item (draw_tool, item);
g_object_unref (item);
}
void
gimp_draw_tool_draw_arc_by_anchor (GimpDrawTool *draw_tool,
gboolean filled,
gdouble x,
gdouble y,
gint width,
gint height,
gint angle1,
gint angle2,
GtkAnchorType anchor)
{
GimpCanvasItem *item;
gdouble a1, a2;
g_return_if_fail (GIMP_IS_DRAW_TOOL (draw_tool));
item = gimp_canvas_handle_new (filled ?
GIMP_HANDLE_FILLED_CIRCLE :
GIMP_HANDLE_CIRCLE,
anchor, x, y, width, height);
a1 = (gdouble) angle1 / 64.0 / 180.0 * G_PI;
a2 = (gdouble) angle2 / 64.0 / 180.0 * G_PI;
gimp_canvas_handle_set_angles (GIMP_CANVAS_HANDLE (item), a1, a2);
gimp_draw_tool_add_item (draw_tool, item);
g_object_unref (item);
}
void
gimp_draw_tool_draw_handle (GimpDrawTool *draw_tool,
GimpHandleType type,
gdouble x,
gdouble y,
gint width,
gint height,
GtkAnchorType anchor)
{
GimpCanvasItem *item;
g_return_if_fail (GIMP_IS_DRAW_TOOL (draw_tool));
item = gimp_canvas_handle_new (type, anchor, x, y, width, height);
gimp_draw_tool_add_item (draw_tool, item);
g_object_unref (item);
}
/**
* gimp_draw_tool_draw_corner:
* @draw_tool: the #GimpDrawTool
* @highlight:
* @put_outside: whether to put the handles on the outside of the rectangle
* @x1:
* @y1:
* @x2:
* @y2:
* @width: corner width
* @height: corner height
* @anchor: which corner to draw
*
* This function takes image space coordinates and transforms them to
* screen window coordinates. It draws a corner into an already drawn
* rectangle outline, taking care of not drawing over an already drawn line.
**/
void
gimp_draw_tool_draw_corner (GimpDrawTool *draw_tool,
gboolean highlight,
gboolean put_outside,
gdouble x1,
gdouble y1,
gdouble x2,
gdouble y2,
gint width,
gint height,
GtkAnchorType anchor)
{
GimpCanvasItem *item;
g_return_if_fail (GIMP_IS_DRAW_TOOL (draw_tool));
item = gimp_canvas_corner_new (x1, y1, x2 - x1, y2 - y1,
anchor, width, height, put_outside);
gimp_canvas_item_set_highlight (item, highlight);
gimp_draw_tool_add_item (draw_tool, item);
g_object_unref (item);
}
void
gimp_draw_tool_draw_lines (GimpDrawTool *draw_tool,
const GimpVector2 *points,
gint n_points,
gboolean filled)
{
GimpCanvasItem *item;
g_return_if_fail (GIMP_IS_DRAW_TOOL (draw_tool));
if (points == NULL || n_points < 2)
return;
item = gimp_canvas_polygon_new (points, n_points, filled);
gimp_draw_tool_add_item (draw_tool, item);
g_object_unref (item);
}
void
gimp_draw_tool_draw_strokes (GimpDrawTool *draw_tool,
const GimpCoords *points,
gint n_points,
gboolean filled)
{
GimpCanvasItem *item;
g_return_if_fail (GIMP_IS_DRAW_TOOL (draw_tool));
if (points == NULL || n_points < 2)
return;
item = gimp_canvas_polygon_new_from_coords (points, n_points, filled);
gimp_draw_tool_add_item (draw_tool, item);
g_object_unref (item);
}
/**
* gimp_draw_tool_draw_boundary:
* @draw_tool: a #GimpDrawTool
* @bound_segs: the sorted brush outline
* @n_bound_segs: the number of segments in @bound_segs
* @offset_x: x offset
* @offset_y: y offset
*
* Draw the boundary of the brush that @draw_tool uses. The boundary
* should be sorted with sort_boundary(), and @n_bound_segs should
* include the sentinel segments inserted by sort_boundary() that
* indicate the end of connected segment sequences (groups) .
*/
void
gimp_draw_tool_draw_boundary (GimpDrawTool *draw_tool,
const BoundSeg *bound_segs,
gint n_bound_segs,
gdouble offset_x,
gdouble offset_y)
{
GimpCanvasItem *item;
g_return_if_fail (GIMP_IS_DRAW_TOOL (draw_tool));
g_return_if_fail (n_bound_segs > 0);
g_return_if_fail (bound_segs != NULL);
item = gimp_canvas_boundary_new (bound_segs, n_bound_segs,
offset_x, offset_y);
gimp_draw_tool_add_item (draw_tool, item);
g_object_unref (item);
}
void
gimp_draw_tool_draw_text_cursor (GimpDrawTool *draw_tool,
PangoRectangle *cursor,
gboolean overwrite)
{
GimpCanvasItem *item;
g_return_if_fail (GIMP_IS_DRAW_TOOL (draw_tool));
item = gimp_canvas_text_cursor_new (cursor, overwrite);
gimp_draw_tool_add_item (draw_tool, item);
g_object_unref (item);
}
gboolean
gimp_draw_tool_on_handle (GimpDrawTool *draw_tool,
GimpDisplay *display,
gdouble x,
gdouble y,
GimpHandleType type,
gdouble handle_x,
gdouble handle_y,
gint width,
gint height,
GtkAnchorType anchor)
{
GimpDisplayShell *shell;
gdouble tx, ty;
gdouble handle_tx, handle_ty;
g_return_val_if_fail (GIMP_IS_DRAW_TOOL (draw_tool), FALSE);
g_return_val_if_fail (GIMP_IS_DISPLAY (display), FALSE);
shell = gimp_display_get_shell (display);
gimp_display_shell_transform_xy_f (shell,
x, y,
&tx, &ty);
gimp_display_shell_transform_xy_f (shell,
handle_x, handle_y,
&handle_tx, &handle_ty);
switch (type)
{
case GIMP_HANDLE_SQUARE:
case GIMP_HANDLE_FILLED_SQUARE:
case GIMP_HANDLE_CROSS:
gimp_draw_tool_shift_to_north_west (handle_tx, handle_ty,
width, height,
anchor,
&handle_tx, &handle_ty);
return (tx == CLAMP (tx, handle_tx, handle_tx + width) &&
ty == CLAMP (ty, handle_ty, handle_ty + height));
case GIMP_HANDLE_CIRCLE:
case GIMP_HANDLE_FILLED_CIRCLE:
gimp_draw_tool_shift_to_center (handle_tx, handle_ty,
width, height,
anchor,
&handle_tx, &handle_ty);
/* FIXME */
if (width != height)
width = (width + height) / 2;
width /= 2;
return ((SQR (handle_tx - tx) + SQR (handle_ty - ty)) < SQR (width));
default:
g_warning ("%s: invalid handle type %d", G_STRFUNC, type);
break;
}
return FALSE;
}
gboolean
gimp_draw_tool_on_vectors_handle (GimpDrawTool *draw_tool,
GimpDisplay *display,
GimpVectors *vectors,
const GimpCoords *coord,
gint width,
gint height,
GimpAnchorType preferred,
gboolean exclusive,
GimpAnchor **ret_anchor,
GimpStroke **ret_stroke)
{
GimpStroke *stroke = NULL;
GimpStroke *pref_stroke = NULL;
GimpAnchor *anchor = NULL;
GimpAnchor *pref_anchor = NULL;
gdouble dx, dy;
gdouble pref_mindist = -1;
gdouble mindist = -1;
g_return_val_if_fail (GIMP_IS_DRAW_TOOL (draw_tool), FALSE);
g_return_val_if_fail (GIMP_IS_DISPLAY (display), FALSE);
g_return_val_if_fail (GIMP_IS_VECTORS (vectors), FALSE);
g_return_val_if_fail (coord != NULL, FALSE);
if (ret_anchor) *ret_anchor = NULL;
if (ret_stroke) *ret_stroke = NULL;
while ((stroke = gimp_vectors_stroke_get_next (vectors, stroke)))
{
GList *anchor_list = gimp_stroke_get_draw_anchors (stroke);
GList *list;
anchor_list = g_list_concat (gimp_stroke_get_draw_anchors (stroke),
gimp_stroke_get_draw_controls (stroke));
for (list = anchor_list; list; list = g_list_next (list))
{
dx = coord->x - GIMP_ANCHOR (list->data)->position.x;
dy = coord->y - GIMP_ANCHOR (list->data)->position.y;
if (mindist < 0 || mindist > dx * dx + dy * dy)
{
mindist = dx * dx + dy * dy;
anchor = GIMP_ANCHOR (list->data);
if (ret_stroke)
*ret_stroke = stroke;
}
if ((pref_mindist < 0 || pref_mindist > dx * dx + dy * dy) &&
GIMP_ANCHOR (list->data)->type == preferred)
{
pref_mindist = dx * dx + dy * dy;
pref_anchor = GIMP_ANCHOR (list->data);
pref_stroke = stroke;
}
}
g_list_free (anchor_list);
}
/* If the data passed into ret_anchor is a preferred anchor, return it. */
if (ret_anchor && *ret_anchor &&
gimp_draw_tool_on_handle (draw_tool, display,
coord->x,
coord->y,
GIMP_HANDLE_CIRCLE,
(*ret_anchor)->position.x,
(*ret_anchor)->position.y,
width, height,
GTK_ANCHOR_CENTER) &&
(*ret_anchor)->type == preferred)
{
if (ret_stroke) *ret_stroke = pref_stroke;
return TRUE;
}
if (pref_anchor && gimp_draw_tool_on_handle (draw_tool, display,
coord->x,
coord->y,
GIMP_HANDLE_CIRCLE,
pref_anchor->position.x,
pref_anchor->position.y,
width, height,
GTK_ANCHOR_CENTER))
{
if (ret_anchor) *ret_anchor = pref_anchor;
if (ret_stroke) *ret_stroke = pref_stroke;
return TRUE;
}
else if (!exclusive && anchor &&
gimp_draw_tool_on_handle (draw_tool, display,
coord->x,
coord->y,
GIMP_HANDLE_CIRCLE,
anchor->position.x,
anchor->position.y,
width, height,
GTK_ANCHOR_CENTER))
{
if (ret_anchor)
*ret_anchor = anchor;
/* *ret_stroke already set correctly. */
return TRUE;
}
if (ret_anchor)
*ret_anchor = NULL;
if (ret_stroke)
*ret_stroke = NULL;
return FALSE;
}
gboolean
gimp_draw_tool_on_vectors_curve (GimpDrawTool *draw_tool,
GimpDisplay *display,
GimpVectors *vectors,
const GimpCoords *coord,
gint width,
gint height,
GimpCoords *ret_coords,
gdouble *ret_pos,
GimpAnchor **ret_segment_start,
GimpAnchor **ret_segment_end,
GimpStroke **ret_stroke)
{
GimpStroke *stroke = NULL;
GimpAnchor *segment_start;
GimpAnchor *segment_end;
GimpCoords min_coords = GIMP_COORDS_DEFAULT_VALUES;
GimpCoords cur_coords;
gdouble min_dist, cur_dist, cur_pos;
g_return_val_if_fail (GIMP_IS_DRAW_TOOL (draw_tool), FALSE);
g_return_val_if_fail (GIMP_IS_DISPLAY (display), FALSE);
g_return_val_if_fail (GIMP_IS_VECTORS (vectors), FALSE);
g_return_val_if_fail (coord != NULL, FALSE);
if (ret_coords) *ret_coords = *coord;
if (ret_pos) *ret_pos = -1.0;
if (ret_segment_start) *ret_segment_start = NULL;
if (ret_segment_start) *ret_segment_end = NULL;
if (ret_stroke) *ret_stroke = NULL;
min_dist = -1.0;
while ((stroke = gimp_vectors_stroke_get_next (vectors, stroke)))
{
cur_dist = gimp_stroke_nearest_point_get (stroke, coord, 1.0,
&cur_coords,
&segment_start,
&segment_end,
&cur_pos);
if (cur_dist >= 0 && (min_dist < 0 || cur_dist < min_dist))
{
min_dist = cur_dist;
min_coords = cur_coords;
if (ret_coords) *ret_coords = cur_coords;
if (ret_pos) *ret_pos = cur_pos;
if (ret_segment_start) *ret_segment_start = segment_start;
if (ret_segment_end) *ret_segment_end = segment_end;
if (ret_stroke) *ret_stroke = stroke;
}
}
if (min_dist >= 0 &&
gimp_draw_tool_on_handle (draw_tool, display,
coord->x,
coord->y,
GIMP_HANDLE_CIRCLE,
min_coords.x,
min_coords.y,
width, height,
GTK_ANCHOR_CENTER))
{
return TRUE;
}
return FALSE;
}
gboolean
gimp_draw_tool_on_vectors (GimpDrawTool *draw_tool,
GimpDisplay *display,
const GimpCoords *coords,
gint width,
gint height,
GimpCoords *ret_coords,
gdouble *ret_pos,
GimpAnchor **ret_segment_start,
GimpAnchor **ret_segment_end,
GimpStroke **ret_stroke,
GimpVectors **ret_vectors)
{
GList *all_vectors;
GList *list;
if (ret_coords) *ret_coords = *coords;
if (ret_pos) *ret_pos = -1.0;
if (ret_segment_start) *ret_segment_start = NULL;
if (ret_segment_end) *ret_segment_end = NULL;
if (ret_stroke) *ret_stroke = NULL;
if (ret_vectors) *ret_vectors = NULL;
all_vectors = gimp_image_get_vectors_list (gimp_display_get_image (display));
for (list = all_vectors; list; list = g_list_next (list))
{
GimpVectors *vectors = list->data;
if (! gimp_item_get_visible (GIMP_ITEM (vectors)))
continue;
if (gimp_draw_tool_on_vectors_curve (draw_tool,
display,
vectors, coords,
width, height,
ret_coords,
ret_pos,
ret_segment_start,
ret_segment_end,
ret_stroke))
{
if (ret_vectors)
*ret_vectors = vectors;
g_list_free (all_vectors);
return TRUE;
}
}
g_list_free (all_vectors);
return FALSE;
}
/* private functions */
static inline void
gimp_draw_tool_shift_to_north_west (gdouble x,
gdouble y,
gint handle_width,
gint handle_height,
GtkAnchorType anchor,
gdouble *shifted_x,
gdouble *shifted_y)
{
switch (anchor)
{
case GTK_ANCHOR_CENTER:
x -= (handle_width >> 1);
y -= (handle_height >> 1);
break;
case GTK_ANCHOR_NORTH:
x -= (handle_width >> 1);
break;
case GTK_ANCHOR_NORTH_WEST:
/* nothing, this is the default */
break;
case GTK_ANCHOR_NORTH_EAST:
x -= handle_width;
break;
case GTK_ANCHOR_SOUTH:
x -= (handle_width >> 1);
y -= handle_height;
break;
case GTK_ANCHOR_SOUTH_WEST:
y -= handle_height;
break;
case GTK_ANCHOR_SOUTH_EAST:
x -= handle_width;
y -= handle_height;
break;
case GTK_ANCHOR_WEST:
y -= (handle_height >> 1);
break;
case GTK_ANCHOR_EAST:
x -= handle_width;
y -= (handle_height >> 1);
break;
default:
break;
}
if (shifted_x)
*shifted_x = x;
if (shifted_y)
*shifted_y = y;
}
static inline void
gimp_draw_tool_shift_to_center (gdouble x,
gdouble y,
gint handle_width,
gint handle_height,
GtkAnchorType anchor,
gdouble *shifted_x,
gdouble *shifted_y)
{
switch (anchor)
{
case GTK_ANCHOR_CENTER:
/* nothing, this is the default */
break;
case GTK_ANCHOR_NORTH:
y += (handle_height >> 1);
break;
case GTK_ANCHOR_NORTH_WEST:
x += (handle_width >> 1);
y += (handle_height >> 1);
break;
case GTK_ANCHOR_NORTH_EAST:
x -= (handle_width >> 1);
y += (handle_height >> 1);
break;
case GTK_ANCHOR_SOUTH:
y -= (handle_height >> 1);
break;
case GTK_ANCHOR_SOUTH_WEST:
x += (handle_width >> 1);
y -= (handle_height >> 1);
break;
case GTK_ANCHOR_SOUTH_EAST:
x -= (handle_width >> 1);
y -= (handle_height >> 1);
break;
case GTK_ANCHOR_WEST:
x += (handle_width >> 1);
break;
case GTK_ANCHOR_EAST:
x -= (handle_width >> 1);
break;
default:
break;
}
if (shifted_x)
*shifted_x = x;
if (shifted_y)
*shifted_y = y;
}
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