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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 03:13:10 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 03:13:10 +0000 |
commit | 3c57dd931145d43f2b0aef96c4d178135956bf91 (patch) | |
tree | 3de698981e9f0cc2c4f9569b19a5f3595e741f6b /app/display/gimptoolpolygon.c | |
parent | Initial commit. (diff) | |
download | gimp-3c57dd931145d43f2b0aef96c4d178135956bf91.tar.xz gimp-3c57dd931145d43f2b0aef96c4d178135956bf91.zip |
Adding upstream version 2.10.36.upstream/2.10.36
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | app/display/gimptoolpolygon.c | 1495 |
1 files changed, 1495 insertions, 0 deletions
diff --git a/app/display/gimptoolpolygon.c b/app/display/gimptoolpolygon.c new file mode 100644 index 0000000..4f2c20b --- /dev/null +++ b/app/display/gimptoolpolygon.c @@ -0,0 +1,1495 @@ +/* GIMP - The GNU Image Manipulation Program + * Copyright (C) 1995 Spencer Kimball and Peter Mattis + * + * gimptoolpolygon.c + * Copyright (C) 2017 Michael Natterer <mitch@gimp.org> + * + * Based on GimpFreeSelectTool + * + * Major improvement to support polygonal segments + * Copyright (C) 2008 Martin Nordholts + * + * 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 <string.h> + +#include <gegl.h> +#include <gtk/gtk.h> +#include <gdk/gdkkeysyms.h> + +#include "libgimpbase/gimpbase.h" +#include "libgimpmath/gimpmath.h" + +#include "display-types.h" + +#include "core/gimp-utils.h" +#include "core/gimpmarshal.h" + +#include "widgets/gimpwidgets-utils.h" + +#include "gimpcanvashandle.h" +#include "gimpcanvasline.h" +#include "gimpcanvaspolygon.h" +#include "gimpdisplayshell.h" +#include "gimpdisplayshell-utils.h" +#include "gimptoolpolygon.h" + +#include "gimp-intl.h" + + +#define POINT_GRAB_THRESHOLD_SQ SQR (GIMP_CANVAS_HANDLE_SIZE_CIRCLE / 2) +#define POINT_SHOW_THRESHOLD_SQ SQR (GIMP_CANVAS_HANDLE_SIZE_CIRCLE * 7) +#define N_ITEMS_PER_ALLOC 1024 +#define INVALID_INDEX (-1) +#define NO_CLICK_TIME_AVAILABLE 0 + + +enum +{ + CHANGE_COMPLETE, + LAST_SIGNAL +}; + + +struct _GimpToolPolygonPrivate +{ + /* Index of grabbed segment index. */ + gint grabbed_segment_index; + + /* We need to keep track of a number of points when we move a + * segment vertex + */ + GimpVector2 *saved_points_lower_segment; + GimpVector2 *saved_points_higher_segment; + gint max_n_saved_points_lower_segment; + gint max_n_saved_points_higher_segment; + + /* Keeps track whether or not a modification of the polygon has been + * made between _button_press and _button_release + */ + gboolean polygon_modified; + + /* Point which is used to draw the polygon but which is not part of + * it yet + */ + GimpVector2 pending_point; + gboolean show_pending_point; + + /* The points of the polygon */ + GimpVector2 *points; + gint max_n_points; + + /* The number of points actually in use */ + gint n_points; + + + /* Any int array containing the indices for the points in the + * polygon that connects different segments together + */ + gint *segment_indices; + gint max_n_segment_indices; + + /* The number of segment indices actually in use */ + gint n_segment_indices; + + /* Is the polygon closed? */ + gboolean polygon_closed; + + /* Whether or not to constrain the angle for newly created polygonal + * segments. + */ + gboolean constrain_angle; + + /* Whether or not to suppress handles (so that new segments can be + * created immediately after an existing segment vertex. + */ + gboolean suppress_handles; + + /* Last _oper_update or _motion coords */ + gboolean hover; + GimpVector2 last_coords; + + /* A double-click commits the selection, keep track of last + * click-time and click-position. + */ + guint32 last_click_time; + GimpCoords last_click_coord; + + /* Are we in a click-drag-release? */ + gboolean button_down; + + GimpCanvasItem *polygon; + GimpCanvasItem *pending_line; + GimpCanvasItem *closing_line; + GPtrArray *handles; +}; + + +/* local function prototypes */ + +static void gimp_tool_polygon_constructed (GObject *object); +static void gimp_tool_polygon_finalize (GObject *object); +static void gimp_tool_polygon_set_property (GObject *object, + guint property_id, + const GValue *value, + GParamSpec *pspec); +static void gimp_tool_polygon_get_property (GObject *object, + guint property_id, + GValue *value, + GParamSpec *pspec); + +static void gimp_tool_polygon_changed (GimpToolWidget *widget); +static gint gimp_tool_polygon_button_press (GimpToolWidget *widget, + const GimpCoords *coords, + guint32 time, + GdkModifierType state, + GimpButtonPressType press_type); +static void gimp_tool_polygon_button_release (GimpToolWidget *widget, + const GimpCoords *coords, + guint32 time, + GdkModifierType state, + GimpButtonReleaseType release_type); +static void gimp_tool_polygon_motion (GimpToolWidget *widget, + const GimpCoords *coords, + guint32 time, + GdkModifierType state); +static GimpHit gimp_tool_polygon_hit (GimpToolWidget *widget, + const GimpCoords *coords, + GdkModifierType state, + gboolean proximity); +static void gimp_tool_polygon_hover (GimpToolWidget *widget, + const GimpCoords *coords, + GdkModifierType state, + gboolean proximity); +static void gimp_tool_polygon_leave_notify (GimpToolWidget *widget); +static gboolean gimp_tool_polygon_key_press (GimpToolWidget *widget, + GdkEventKey *kevent); +static void gimp_tool_polygon_motion_modifier (GimpToolWidget *widget, + GdkModifierType key, + gboolean press, + GdkModifierType state); +static void gimp_tool_polygon_hover_modifier (GimpToolWidget *widget, + GdkModifierType key, + gboolean press, + GdkModifierType state); +static gboolean gimp_tool_polygon_get_cursor (GimpToolWidget *widget, + const GimpCoords *coords, + GdkModifierType state, + GimpCursorType *cursor, + GimpToolCursorType *tool_cursor, + GimpCursorModifier *modifier); + +static void gimp_tool_polygon_change_complete (GimpToolPolygon *polygon); + +static gint gimp_tool_polygon_get_segment_index (GimpToolPolygon *polygon, + const GimpCoords *coords); + + +G_DEFINE_TYPE_WITH_PRIVATE (GimpToolPolygon, gimp_tool_polygon, + GIMP_TYPE_TOOL_WIDGET) + +#define parent_class gimp_tool_polygon_parent_class + +static guint polygon_signals[LAST_SIGNAL] = { 0, }; + +static const GimpVector2 vector2_zero = { 0.0, 0.0 }; + + +static void +gimp_tool_polygon_class_init (GimpToolPolygonClass *klass) +{ + GObjectClass *object_class = G_OBJECT_CLASS (klass); + GimpToolWidgetClass *widget_class = GIMP_TOOL_WIDGET_CLASS (klass); + + object_class->constructed = gimp_tool_polygon_constructed; + object_class->finalize = gimp_tool_polygon_finalize; + object_class->set_property = gimp_tool_polygon_set_property; + object_class->get_property = gimp_tool_polygon_get_property; + + widget_class->changed = gimp_tool_polygon_changed; + widget_class->button_press = gimp_tool_polygon_button_press; + widget_class->button_release = gimp_tool_polygon_button_release; + widget_class->motion = gimp_tool_polygon_motion; + widget_class->hit = gimp_tool_polygon_hit; + widget_class->hover = gimp_tool_polygon_hover; + widget_class->leave_notify = gimp_tool_polygon_leave_notify; + widget_class->key_press = gimp_tool_polygon_key_press; + widget_class->motion_modifier = gimp_tool_polygon_motion_modifier; + widget_class->hover_modifier = gimp_tool_polygon_hover_modifier; + widget_class->get_cursor = gimp_tool_polygon_get_cursor; + + polygon_signals[CHANGE_COMPLETE] = + g_signal_new ("change-complete", + G_TYPE_FROM_CLASS (klass), + G_SIGNAL_RUN_FIRST, + G_STRUCT_OFFSET (GimpToolPolygonClass, change_complete), + NULL, NULL, + g_cclosure_marshal_VOID__VOID, + G_TYPE_NONE, 0); +} + +static void +gimp_tool_polygon_init (GimpToolPolygon *polygon) +{ + polygon->private = gimp_tool_polygon_get_instance_private (polygon); + + polygon->private->grabbed_segment_index = INVALID_INDEX; + polygon->private->last_click_time = NO_CLICK_TIME_AVAILABLE; +} + +static void +gimp_tool_polygon_constructed (GObject *object) +{ + GimpToolPolygon *polygon = GIMP_TOOL_POLYGON (object); + GimpToolWidget *widget = GIMP_TOOL_WIDGET (object); + GimpToolPolygonPrivate *private = polygon->private; + GimpCanvasGroup *stroke_group; + + G_OBJECT_CLASS (parent_class)->constructed (object); + + stroke_group = gimp_tool_widget_add_stroke_group (widget); + + gimp_tool_widget_push_group (widget, stroke_group); + + private->polygon = gimp_tool_widget_add_polygon (widget, NULL, + NULL, 0, FALSE); + + private->pending_line = gimp_tool_widget_add_line (widget, 0, 0, 0, 0); + private->closing_line = gimp_tool_widget_add_line (widget, 0, 0, 0, 0); + + gimp_tool_widget_pop_group (widget); + + private->handles = g_ptr_array_new (); + + gimp_tool_polygon_changed (widget); +} + +static void +gimp_tool_polygon_finalize (GObject *object) +{ + GimpToolPolygon *polygon = GIMP_TOOL_POLYGON (object); + GimpToolPolygonPrivate *private = polygon->private; + + g_free (private->points); + g_free (private->segment_indices); + g_free (private->saved_points_lower_segment); + g_free (private->saved_points_higher_segment); + + g_clear_pointer (&private->handles, g_ptr_array_unref); + + G_OBJECT_CLASS (parent_class)->finalize (object); +} + +static void +gimp_tool_polygon_set_property (GObject *object, + guint property_id, + const GValue *value, + GParamSpec *pspec) +{ + switch (property_id) + { + default: + G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec); + break; + } +} + +static void +gimp_tool_polygon_get_property (GObject *object, + guint property_id, + GValue *value, + GParamSpec *pspec) +{ + switch (property_id) + { + default: + G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec); + break; + } +} + +static void +gimp_tool_polygon_get_segment (GimpToolPolygon *polygon, + GimpVector2 **points, + gint *n_points, + gint segment_start, + gint segment_end) +{ + GimpToolPolygonPrivate *priv = polygon->private; + + *points = &priv->points[priv->segment_indices[segment_start]]; + *n_points = priv->segment_indices[segment_end] - + priv->segment_indices[segment_start] + + 1; +} + +static void +gimp_tool_polygon_get_segment_point (GimpToolPolygon *polygon, + gdouble *start_point_x, + gdouble *start_point_y, + gint segment_index) +{ + GimpToolPolygonPrivate *priv = polygon->private; + + *start_point_x = priv->points[priv->segment_indices[segment_index]].x; + *start_point_y = priv->points[priv->segment_indices[segment_index]].y; +} + +static gboolean +gimp_tool_polygon_should_close (GimpToolPolygon *polygon, + guint32 time, + const GimpCoords *coords) +{ + GimpToolWidget *widget = GIMP_TOOL_WIDGET (polygon); + GimpToolPolygonPrivate *priv = polygon->private; + gboolean double_click = FALSE; + gdouble dist; + + if (priv->polygon_modified || + priv->n_segment_indices < 1 || + priv->n_points < 3 || + priv->polygon_closed) + return FALSE; + + dist = gimp_canvas_item_transform_distance_square (priv->polygon, + coords->x, + coords->y, + priv->points[0].x, + priv->points[0].y); + + /* Handle double-click. It must be within GTK+ global double-click + * time since last click, and it must be within GTK+ global + * double-click distance away from the last point + */ + if (time != NO_CLICK_TIME_AVAILABLE) + { + GimpDisplayShell *shell = gimp_tool_widget_get_shell (widget); + GtkSettings *settings = gtk_widget_get_settings (GTK_WIDGET (shell)); + gint double_click_time; + gint double_click_distance; + gint click_time_passed; + gdouble dist_from_last_point; + + click_time_passed = time - priv->last_click_time; + + dist_from_last_point = + gimp_canvas_item_transform_distance_square (priv->polygon, + coords->x, + coords->y, + priv->last_click_coord.x, + priv->last_click_coord.y); + + g_object_get (settings, + "gtk-double-click-time", &double_click_time, + "gtk-double-click-distance", &double_click_distance, + NULL); + + double_click = click_time_passed < double_click_time && + dist_from_last_point < double_click_distance; + } + + return ((! priv->suppress_handles && dist < POINT_GRAB_THRESHOLD_SQ) || + double_click); +} + +static void +gimp_tool_polygon_revert_to_last_segment (GimpToolPolygon *polygon) +{ + GimpToolPolygonPrivate *priv = polygon->private; + + priv->n_points = priv->segment_indices[priv->n_segment_indices - 1] + 1; +} + +static void +gimp_tool_polygon_remove_last_segment (GimpToolPolygon *polygon) +{ + GimpToolPolygonPrivate *priv = polygon->private; + + if (priv->polygon_closed) + { + priv->polygon_closed = FALSE; + + gimp_tool_polygon_changed (GIMP_TOOL_WIDGET (polygon)); + + return; + } + + if (priv->n_segment_indices > 0) + { + GimpCanvasItem *handle; + + priv->n_segment_indices--; + + handle = g_ptr_array_index (priv->handles, + priv->n_segment_indices); + + gimp_tool_widget_remove_item (GIMP_TOOL_WIDGET (polygon), handle); + g_ptr_array_remove (priv->handles, handle); + } + + if (priv->n_segment_indices <= 0) + { + priv->grabbed_segment_index = INVALID_INDEX; + priv->show_pending_point = FALSE; + priv->n_points = 0; + priv->n_segment_indices = 0; + + gimp_tool_widget_response (GIMP_TOOL_WIDGET (polygon), + GIMP_TOOL_WIDGET_RESPONSE_CANCEL); + } + else + { + gimp_tool_polygon_revert_to_last_segment (polygon); + + gimp_tool_polygon_changed (GIMP_TOOL_WIDGET (polygon)); + } +} + +static void +gimp_tool_polygon_add_point (GimpToolPolygon *polygon, + gdouble x, + gdouble y) +{ + GimpToolPolygonPrivate *priv = polygon->private; + + if (priv->n_points >= priv->max_n_points) + { + priv->max_n_points += N_ITEMS_PER_ALLOC; + + priv->points = g_realloc (priv->points, + sizeof (GimpVector2) * priv->max_n_points); + } + + priv->points[priv->n_points].x = x; + priv->points[priv->n_points].y = y; + + priv->n_points++; +} + +static void +gimp_tool_polygon_add_segment_index (GimpToolPolygon *polygon, + gint index) +{ + GimpToolPolygonPrivate *priv = polygon->private; + + if (priv->n_segment_indices >= priv->max_n_segment_indices) + { + priv->max_n_segment_indices += N_ITEMS_PER_ALLOC; + + priv->segment_indices = g_realloc (priv->segment_indices, + sizeof (GimpVector2) * + priv->max_n_segment_indices); + } + + priv->segment_indices[priv->n_segment_indices] = index; + + g_ptr_array_add (priv->handles, + gimp_tool_widget_add_handle (GIMP_TOOL_WIDGET (polygon), + GIMP_HANDLE_CROSS, + 0, 0, + GIMP_CANVAS_HANDLE_SIZE_CIRCLE, + GIMP_CANVAS_HANDLE_SIZE_CIRCLE, + GIMP_HANDLE_ANCHOR_CENTER)); + + priv->n_segment_indices++; +} + +static gboolean +gimp_tool_polygon_is_point_grabbed (GimpToolPolygon *polygon) +{ + GimpToolPolygonPrivate *priv = polygon->private; + + return priv->grabbed_segment_index != INVALID_INDEX; +} + +static void +gimp_tool_polygon_fit_segment (GimpToolPolygon *polygon, + GimpVector2 *dest_points, + GimpVector2 dest_start_target, + GimpVector2 dest_end_target, + const GimpVector2 *source_points, + gint n_points) +{ + GimpVector2 origo_translation_offset; + GimpVector2 untranslation_offset; + gdouble rotation; + gdouble scale; + + /* Handle some quick special cases */ + if (n_points <= 0) + { + return; + } + else if (n_points == 1) + { + dest_points[0] = dest_end_target; + return; + } + else if (n_points == 2) + { + dest_points[0] = dest_start_target; + dest_points[1] = dest_end_target; + return; + } + + /* Copy from source to dest; we work on the dest data */ + memcpy (dest_points, source_points, sizeof (GimpVector2) * n_points); + + /* Transform the destination end point */ + { + GimpVector2 *dest_end; + GimpVector2 origo_translated_end_target; + gdouble target_rotation; + gdouble current_rotation; + gdouble target_length; + gdouble current_length; + + dest_end = &dest_points[n_points - 1]; + + /* Transate to origin */ + gimp_vector2_sub (&origo_translation_offset, + &vector2_zero, + &dest_points[0]); + gimp_vector2_add (dest_end, + dest_end, + &origo_translation_offset); + + /* Calculate origo_translated_end_target */ + gimp_vector2_sub (&origo_translated_end_target, + &dest_end_target, + &dest_start_target); + + /* Rotate */ + target_rotation = atan2 (vector2_zero.y - origo_translated_end_target.y, + vector2_zero.x - origo_translated_end_target.x); + current_rotation = atan2 (vector2_zero.y - dest_end->y, + vector2_zero.x - dest_end->x); + rotation = current_rotation - target_rotation; + + gimp_vector2_rotate (dest_end, rotation); + + + /* Scale */ + target_length = gimp_vector2_length (&origo_translated_end_target); + current_length = gimp_vector2_length (dest_end); + scale = target_length / current_length; + + gimp_vector2_mul (dest_end, scale); + + + /* Untranslate */ + gimp_vector2_sub (&untranslation_offset, + &dest_end_target, + dest_end); + gimp_vector2_add (dest_end, + dest_end, + &untranslation_offset); + } + + /* Do the same transformation for the rest of the points */ + { + gint i; + + for (i = 0; i < n_points - 1; i++) + { + /* Translate */ + gimp_vector2_add (&dest_points[i], + &origo_translation_offset, + &dest_points[i]); + + /* Rotate */ + gimp_vector2_rotate (&dest_points[i], + rotation); + + /* Scale */ + gimp_vector2_mul (&dest_points[i], + scale); + + /* Untranslate */ + gimp_vector2_add (&dest_points[i], + &dest_points[i], + &untranslation_offset); + } + } +} + +static void +gimp_tool_polygon_move_segment_vertex_to (GimpToolPolygon *polygon, + gint segment_index, + gdouble new_x, + gdouble new_y) +{ + GimpToolPolygonPrivate *priv = polygon->private; + GimpVector2 cursor_point = { new_x, new_y }; + GimpVector2 *dest; + GimpVector2 *dest_start_target; + GimpVector2 *dest_end_target; + gint n_points; + + /* Handle the segment before the grabbed point */ + if (segment_index > 0) + { + gimp_tool_polygon_get_segment (polygon, + &dest, + &n_points, + priv->grabbed_segment_index - 1, + priv->grabbed_segment_index); + + dest_start_target = &dest[0]; + dest_end_target = &cursor_point; + + gimp_tool_polygon_fit_segment (polygon, + dest, + *dest_start_target, + *dest_end_target, + priv->saved_points_lower_segment, + n_points); + } + + /* Handle the segment after the grabbed point */ + if (segment_index < priv->n_segment_indices - 1) + { + gimp_tool_polygon_get_segment (polygon, + &dest, + &n_points, + priv->grabbed_segment_index, + priv->grabbed_segment_index + 1); + + dest_start_target = &cursor_point; + dest_end_target = &dest[n_points - 1]; + + gimp_tool_polygon_fit_segment (polygon, + dest, + *dest_start_target, + *dest_end_target, + priv->saved_points_higher_segment, + n_points); + } + + /* Handle when there only is one point */ + if (segment_index == 0 && + priv->n_segment_indices == 1) + { + priv->points[0].x = new_x; + priv->points[0].y = new_y; + } +} + +static void +gimp_tool_polygon_revert_to_saved_state (GimpToolPolygon *polygon) +{ + GimpToolPolygonPrivate *priv = polygon->private; + GimpVector2 *dest; + gint n_points; + + /* Without a point grab we have no sensible information to fall back + * on, bail out + */ + if (! gimp_tool_polygon_is_point_grabbed (polygon)) + { + return; + } + + if (priv->grabbed_segment_index > 0) + { + gimp_tool_polygon_get_segment (polygon, + &dest, + &n_points, + priv->grabbed_segment_index - 1, + priv->grabbed_segment_index); + + memcpy (dest, + priv->saved_points_lower_segment, + sizeof (GimpVector2) * n_points); + } + + if (priv->grabbed_segment_index < priv->n_segment_indices - 1) + { + gimp_tool_polygon_get_segment (polygon, + &dest, + &n_points, + priv->grabbed_segment_index, + priv->grabbed_segment_index + 1); + + memcpy (dest, + priv->saved_points_higher_segment, + sizeof (GimpVector2) * n_points); + } + + if (priv->grabbed_segment_index == 0 && + priv->n_segment_indices == 1) + { + priv->points[0] = *priv->saved_points_lower_segment; + } +} + +static void +gimp_tool_polygon_prepare_for_move (GimpToolPolygon *polygon) +{ + GimpToolPolygonPrivate *priv = polygon->private; + GimpVector2 *source; + gint n_points; + + if (priv->grabbed_segment_index > 0) + { + gimp_tool_polygon_get_segment (polygon, + &source, + &n_points, + priv->grabbed_segment_index - 1, + priv->grabbed_segment_index); + + if (n_points > priv->max_n_saved_points_lower_segment) + { + priv->max_n_saved_points_lower_segment = n_points; + + priv->saved_points_lower_segment = + g_realloc (priv->saved_points_lower_segment, + sizeof (GimpVector2) * n_points); + } + + memcpy (priv->saved_points_lower_segment, + source, + sizeof (GimpVector2) * n_points); + } + + if (priv->grabbed_segment_index < priv->n_segment_indices - 1) + { + gimp_tool_polygon_get_segment (polygon, + &source, + &n_points, + priv->grabbed_segment_index, + priv->grabbed_segment_index + 1); + + if (n_points > priv->max_n_saved_points_higher_segment) + { + priv->max_n_saved_points_higher_segment = n_points; + + priv->saved_points_higher_segment = + g_realloc (priv->saved_points_higher_segment, + sizeof (GimpVector2) * n_points); + } + + memcpy (priv->saved_points_higher_segment, + source, + sizeof (GimpVector2) * n_points); + } + + /* A special-case when there only is one point */ + if (priv->grabbed_segment_index == 0 && + priv->n_segment_indices == 1) + { + if (priv->max_n_saved_points_lower_segment == 0) + { + priv->max_n_saved_points_lower_segment = 1; + + priv->saved_points_lower_segment = g_new0 (GimpVector2, 1); + } + + *priv->saved_points_lower_segment = priv->points[0]; + } +} + +static void +gimp_tool_polygon_update_motion (GimpToolPolygon *polygon, + gdouble new_x, + gdouble new_y) +{ + GimpToolPolygonPrivate *priv = polygon->private; + + if (gimp_tool_polygon_is_point_grabbed (polygon)) + { + priv->polygon_modified = TRUE; + + if (priv->constrain_angle && + priv->n_segment_indices > 1) + { + gdouble start_point_x; + gdouble start_point_y; + gint segment_index; + + /* Base constraints on the last segment vertex if we move + * the first one, otherwise base on the previous segment + * vertex + */ + if (priv->grabbed_segment_index == 0) + { + segment_index = priv->n_segment_indices - 1; + } + else + { + segment_index = priv->grabbed_segment_index - 1; + } + + gimp_tool_polygon_get_segment_point (polygon, + &start_point_x, + &start_point_y, + segment_index); + + gimp_display_shell_constrain_line ( + gimp_tool_widget_get_shell (GIMP_TOOL_WIDGET (polygon)), + start_point_x, + start_point_y, + &new_x, + &new_y, + GIMP_CONSTRAIN_LINE_15_DEGREES); + } + + gimp_tool_polygon_move_segment_vertex_to (polygon, + priv->grabbed_segment_index, + new_x, + new_y); + + /* We also must update the pending point if we are moving the + * first point + */ + if (priv->grabbed_segment_index == 0) + { + priv->pending_point.x = new_x; + priv->pending_point.y = new_y; + } + } + else + { + /* Don't show the pending point while we are adding points */ + priv->show_pending_point = FALSE; + + gimp_tool_polygon_add_point (polygon, new_x, new_y); + } +} + +static void +gimp_tool_polygon_status_update (GimpToolPolygon *polygon, + const GimpCoords *coords, + gboolean proximity) +{ + GimpToolWidget *widget = GIMP_TOOL_WIDGET (polygon); + GimpToolPolygonPrivate *priv = polygon->private; + + if (proximity) + { + const gchar *status_text = NULL; + + if (gimp_tool_polygon_is_point_grabbed (polygon)) + { + if (gimp_tool_polygon_should_close (polygon, + NO_CLICK_TIME_AVAILABLE, + coords)) + { + status_text = _("Click to close shape"); + } + else + { + status_text = _("Click-Drag to move segment vertex"); + } + } + else if (priv->polygon_closed) + { + status_text = _("Return commits, Escape cancels, Backspace re-opens shape"); + } + else if (priv->n_segment_indices >= 3) + { + status_text = _("Return commits, Escape cancels, Backspace removes last segment"); + } + else + { + status_text = _("Click-Drag adds a free segment, Click adds a polygonal segment"); + } + + if (status_text) + { + gimp_tool_widget_set_status (widget, status_text); + } + } + else + { + gimp_tool_widget_set_status (widget, NULL); + } +} + +static void +gimp_tool_polygon_changed (GimpToolWidget *widget) +{ + GimpToolPolygon *polygon = GIMP_TOOL_POLYGON (widget); + GimpToolPolygonPrivate *private = polygon->private; + gboolean hovering_first_point = FALSE; + gboolean handles_wants_to_show = FALSE; + GimpCoords coords = { private->last_coords.x, + private->last_coords.y, + /* pad with 0 */ }; + gint i; + + gimp_canvas_polygon_set_points (private->polygon, + private->points, private->n_points); + + if (private->show_pending_point) + { + GimpVector2 last = private->points[private->n_points - 1]; + + gimp_canvas_line_set (private->pending_line, + last.x, + last.y, + private->pending_point.x, + private->pending_point.y); + } + + gimp_canvas_item_set_visible (private->pending_line, + private->show_pending_point); + + if (private->polygon_closed) + { + GimpVector2 first = private->points[0]; + GimpVector2 last = private->points[private->n_points - 1]; + + gimp_canvas_line_set (private->closing_line, + first.x, first.y, + last.x, last.y); + } + + gimp_canvas_item_set_visible (private->closing_line, + private->polygon_closed); + + hovering_first_point = + gimp_tool_polygon_should_close (polygon, + NO_CLICK_TIME_AVAILABLE, + &coords); + + /* We always show the handle for the first point, even with button1 + * down, since releasing the button on the first point will close + * the polygon, so it's a significant state which we must give + * feedback for + */ + handles_wants_to_show = (hovering_first_point || ! private->button_down); + + for (i = 0; i < private->n_segment_indices; i++) + { + GimpCanvasItem *handle; + GimpVector2 *point; + + handle = g_ptr_array_index (private->handles, i); + point = &private->points[private->segment_indices[i]]; + + if (private->hover && + handles_wants_to_show && + ! private->suppress_handles && + + /* If the first point is hovered while button1 is held down, + * only draw the first handle, the other handles are not + * relevant (see comment a few lines up) + */ + (i == 0 || + ! (private->button_down || hovering_first_point))) + { + gdouble dist; + GimpHandleType handle_type = -1; + + dist = + gimp_canvas_item_transform_distance_square (handle, + private->last_coords.x, + private->last_coords.y, + point->x, + point->y); + + /* If the cursor is over the point, fill, if it's just + * close, draw an outline + */ + if (dist < POINT_GRAB_THRESHOLD_SQ) + handle_type = GIMP_HANDLE_FILLED_CIRCLE; + else if (dist < POINT_SHOW_THRESHOLD_SQ) + handle_type = GIMP_HANDLE_CIRCLE; + + if (handle_type != -1) + { + gint size; + + gimp_canvas_item_begin_change (handle); + + gimp_canvas_handle_set_position (handle, point->x, point->y); + + g_object_set (handle, + "type", handle_type, + NULL); + + size = gimp_canvas_handle_calc_size (handle, + private->last_coords.x, + private->last_coords.y, + GIMP_CANVAS_HANDLE_SIZE_CIRCLE, + 2 * GIMP_CANVAS_HANDLE_SIZE_CIRCLE); + if (FALSE) + gimp_canvas_handle_set_size (handle, size, size); + + if (dist < POINT_GRAB_THRESHOLD_SQ) + gimp_canvas_item_set_highlight (handle, TRUE); + else + gimp_canvas_item_set_highlight (handle, FALSE); + + gimp_canvas_item_set_visible (handle, TRUE); + + gimp_canvas_item_end_change (handle); + } + else + { + gimp_canvas_item_set_visible (handle, FALSE); + } + } + else + { + gimp_canvas_item_set_visible (handle, FALSE); + } + } +} + +static gboolean +gimp_tool_polygon_button_press (GimpToolWidget *widget, + const GimpCoords *coords, + guint32 time, + GdkModifierType state, + GimpButtonPressType press_type) +{ + GimpToolPolygon *polygon = GIMP_TOOL_POLYGON (widget); + GimpToolPolygonPrivate *priv = polygon->private; + + if (gimp_tool_polygon_is_point_grabbed (polygon)) + { + gimp_tool_polygon_prepare_for_move (polygon); + } + else if (priv->polygon_closed) + { + if (press_type == GIMP_BUTTON_PRESS_DOUBLE && + gimp_canvas_item_hit (priv->polygon, coords->x, coords->y)) + { + gimp_tool_widget_response (widget, GIMP_TOOL_WIDGET_RESPONSE_CONFIRM); + } + + return 0; + } + else + { + GimpVector2 point_to_add; + + /* Note that we add the pending point (unless it is the first + * point we add) because the pending point is setup correctly + * with regards to angle constraints. + */ + if (priv->n_points > 0) + { + point_to_add = priv->pending_point; + } + else + { + point_to_add.x = coords->x; + point_to_add.y = coords->y; + } + + /* No point was grabbed, add a new point and mark this as a + * segment divider. For a line segment, this will be the only + * new point. For a free segment, this will be the first point + * of the free segment. + */ + gimp_tool_polygon_add_point (polygon, + point_to_add.x, + point_to_add.y); + gimp_tool_polygon_add_segment_index (polygon, priv->n_points - 1); + } + + priv->button_down = TRUE; + + gimp_tool_polygon_changed (widget); + + return 1; +} + +static void +gimp_tool_polygon_button_release (GimpToolWidget *widget, + const GimpCoords *coords, + guint32 time, + GdkModifierType state, + GimpButtonReleaseType release_type) +{ + GimpToolPolygon *polygon = GIMP_TOOL_POLYGON (widget); + GimpToolPolygonPrivate *priv = polygon->private; + + g_object_ref (widget); + + priv->button_down = FALSE; + + switch (release_type) + { + case GIMP_BUTTON_RELEASE_CLICK: + case GIMP_BUTTON_RELEASE_NO_MOTION: + /* If a click was made, we don't consider the polygon modified */ + priv->polygon_modified = FALSE; + + /* First finish of the line segment if no point was grabbed */ + if (! gimp_tool_polygon_is_point_grabbed (polygon)) + { + /* Revert any free segment points that might have been added */ + gimp_tool_polygon_revert_to_last_segment (polygon); + } + + /* After the segments are up to date and we have handled + * double-click, see if it's committing time + */ + if (gimp_tool_polygon_should_close (polygon, time, coords)) + { + /* We can get a click notification even though the end point + * has been moved a few pixels. Since a move will change the + * free selection, revert it before doing the commit. + */ + gimp_tool_polygon_revert_to_saved_state (polygon); + + priv->polygon_closed = TRUE; + + gimp_tool_polygon_change_complete (polygon); + } + + priv->last_click_time = time; + priv->last_click_coord = *coords; + break; + + case GIMP_BUTTON_RELEASE_NORMAL: + /* First finish of the free segment if no point was grabbed */ + if (! gimp_tool_polygon_is_point_grabbed (polygon)) + { + /* The points are all setup, just make a segment */ + gimp_tool_polygon_add_segment_index (polygon, priv->n_points - 1); + } + + /* After the segments are up to date, see if it's committing time */ + if (gimp_tool_polygon_should_close (polygon, + NO_CLICK_TIME_AVAILABLE, + coords)) + { + priv->polygon_closed = TRUE; + } + + gimp_tool_polygon_change_complete (polygon); + break; + + case GIMP_BUTTON_RELEASE_CANCEL: + if (gimp_tool_polygon_is_point_grabbed (polygon)) + gimp_tool_polygon_revert_to_saved_state (polygon); + else + gimp_tool_polygon_remove_last_segment (polygon); + break; + + default: + break; + } + + /* Reset */ + priv->polygon_modified = FALSE; + + gimp_tool_polygon_changed (widget); + + g_object_unref (widget); +} + +static void +gimp_tool_polygon_motion (GimpToolWidget *widget, + const GimpCoords *coords, + guint32 time, + GdkModifierType state) +{ + GimpToolPolygon *polygon = GIMP_TOOL_POLYGON (widget); + GimpToolPolygonPrivate *priv = polygon->private; + + priv->last_coords.x = coords->x; + priv->last_coords.y = coords->y; + + gimp_tool_polygon_update_motion (polygon, + coords->x, + coords->y); + + gimp_tool_polygon_changed (widget); +} + +static GimpHit +gimp_tool_polygon_hit (GimpToolWidget *widget, + const GimpCoords *coords, + GdkModifierType state, + gboolean proximity) +{ + GimpToolPolygon *polygon = GIMP_TOOL_POLYGON (widget); + GimpToolPolygonPrivate *priv = polygon->private; + + if ((priv->n_points > 0 && ! priv->polygon_closed) || + gimp_tool_polygon_get_segment_index (polygon, coords) != INVALID_INDEX) + { + return GIMP_HIT_DIRECT; + } + else if (priv->polygon_closed && + gimp_canvas_item_hit (priv->polygon, coords->x, coords->y)) + { + return GIMP_HIT_INDIRECT; + } + + return GIMP_HIT_NONE; +} + +static void +gimp_tool_polygon_hover (GimpToolWidget *widget, + const GimpCoords *coords, + GdkModifierType state, + gboolean proximity) +{ + GimpToolPolygon *polygon = GIMP_TOOL_POLYGON (widget); + GimpToolPolygonPrivate *priv = polygon->private; + gboolean hovering_first_point; + + priv->grabbed_segment_index = gimp_tool_polygon_get_segment_index (polygon, + coords); + priv->hover = TRUE; + + hovering_first_point = + gimp_tool_polygon_should_close (polygon, + NO_CLICK_TIME_AVAILABLE, + coords); + + priv->last_coords.x = coords->x; + priv->last_coords.y = coords->y; + + if (priv->n_points == 0 || + priv->polygon_closed || + (gimp_tool_polygon_is_point_grabbed (polygon) && + ! hovering_first_point) || + ! proximity) + { + priv->show_pending_point = FALSE; + } + else + { + priv->show_pending_point = TRUE; + + if (hovering_first_point) + { + priv->pending_point = priv->points[0]; + } + else + { + priv->pending_point.x = coords->x; + priv->pending_point.y = coords->y; + + if (priv->constrain_angle && priv->n_points > 0) + { + gdouble start_point_x; + gdouble start_point_y; + + /* the last point is the line's start point */ + gimp_tool_polygon_get_segment_point (polygon, + &start_point_x, + &start_point_y, + priv->n_segment_indices - 1); + + gimp_display_shell_constrain_line ( + gimp_tool_widget_get_shell (widget), + start_point_x, start_point_y, + &priv->pending_point.x, + &priv->pending_point.y, + GIMP_CONSTRAIN_LINE_15_DEGREES); + } + } + } + + gimp_tool_polygon_status_update (polygon, coords, proximity); + + gimp_tool_polygon_changed (widget); +} + +static void +gimp_tool_polygon_leave_notify (GimpToolWidget *widget) +{ + GimpToolPolygon *polygon = GIMP_TOOL_POLYGON (widget); + GimpToolPolygonPrivate *priv = polygon->private; + + priv->grabbed_segment_index = INVALID_INDEX; + priv->hover = FALSE; + priv->show_pending_point = FALSE; + + gimp_tool_polygon_changed (widget); +} + +static gboolean +gimp_tool_polygon_key_press (GimpToolWidget *widget, + GdkEventKey *kevent) +{ + GimpToolPolygon *polygon = GIMP_TOOL_POLYGON (widget); + GimpToolPolygonPrivate *priv = polygon->private; + + switch (kevent->keyval) + { + case GDK_KEY_BackSpace: + gimp_tool_polygon_remove_last_segment (polygon); + + if (priv->n_segment_indices > 0) + gimp_tool_polygon_change_complete (polygon); + return TRUE; + + default: + break; + } + + return GIMP_TOOL_WIDGET_CLASS (parent_class)->key_press (widget, kevent); +} + +static void +gimp_tool_polygon_motion_modifier (GimpToolWidget *widget, + GdkModifierType key, + gboolean press, + GdkModifierType state) +{ + GimpToolPolygon *polygon = GIMP_TOOL_POLYGON (widget); + GimpToolPolygonPrivate *priv = polygon->private; + + priv->constrain_angle = ((state & gimp_get_constrain_behavior_mask ()) ? + TRUE : FALSE); + + /* If we didn't came here due to a mouse release, immediately update + * the position of the thing we move. + */ + if (state & GDK_BUTTON1_MASK) + { + gimp_tool_polygon_update_motion (polygon, + priv->last_coords.x, + priv->last_coords.y); + } + + gimp_tool_polygon_changed (widget); +} + +static void +gimp_tool_polygon_hover_modifier (GimpToolWidget *widget, + GdkModifierType key, + gboolean press, + GdkModifierType state) +{ + GimpToolPolygon *polygon = GIMP_TOOL_POLYGON (widget); + GimpToolPolygonPrivate *priv = polygon->private; + + priv->constrain_angle = ((state & gimp_get_constrain_behavior_mask ()) ? + TRUE : FALSE); + + priv->suppress_handles = ((state & gimp_get_extend_selection_mask ()) ? + TRUE : FALSE); + + gimp_tool_polygon_changed (widget); +} + +static gboolean +gimp_tool_polygon_get_cursor (GimpToolWidget *widget, + const GimpCoords *coords, + GdkModifierType state, + GimpCursorType *cursor, + GimpToolCursorType *tool_cursor, + GimpCursorModifier *modifier) +{ + GimpToolPolygon *polygon = GIMP_TOOL_POLYGON (widget); + + if (gimp_tool_polygon_is_point_grabbed (polygon) && + ! gimp_tool_polygon_should_close (polygon, + NO_CLICK_TIME_AVAILABLE, + coords)) + { + *modifier = GIMP_CURSOR_MODIFIER_MOVE; + + return TRUE; + } + + return FALSE; +} + +static void +gimp_tool_polygon_change_complete (GimpToolPolygon *polygon) +{ + g_signal_emit (polygon, polygon_signals[CHANGE_COMPLETE], 0); +} + +static gint +gimp_tool_polygon_get_segment_index (GimpToolPolygon *polygon, + const GimpCoords *coords) +{ + GimpToolPolygonPrivate *priv = polygon->private; + gint segment_index = INVALID_INDEX; + + if (! priv->suppress_handles) + { + gdouble shortest_dist = POINT_GRAB_THRESHOLD_SQ; + gint i; + + for (i = 0; i < priv->n_segment_indices; i++) + { + gdouble dist; + GimpVector2 *point; + + point = &priv->points[priv->segment_indices[i]]; + + dist = gimp_canvas_item_transform_distance_square (priv->polygon, + coords->x, + coords->y, + point->x, + point->y); + + if (dist < shortest_dist) + { + shortest_dist = dist; + + segment_index = i; + } + } + } + + return segment_index; +} + + +/* public functions */ + +GimpToolWidget * +gimp_tool_polygon_new (GimpDisplayShell *shell) +{ + g_return_val_if_fail (GIMP_IS_DISPLAY_SHELL (shell), NULL); + + return g_object_new (GIMP_TYPE_TOOL_POLYGON, + "shell", shell, + NULL); +} + +gboolean +gimp_tool_polygon_is_closed (GimpToolPolygon *polygon) +{ + GimpToolPolygonPrivate *private; + + g_return_val_if_fail (GIMP_IS_TOOL_POLYGON (polygon), FALSE); + + private = polygon->private; + + return private->polygon_closed; +} + +void +gimp_tool_polygon_get_points (GimpToolPolygon *polygon, + const GimpVector2 **points, + gint *n_points) +{ + GimpToolPolygonPrivate *private; + + g_return_if_fail (GIMP_IS_TOOL_POLYGON (polygon)); + + private = polygon->private; + + if (points) *points = private->points; + if (n_points) *n_points = private->n_points; +} |