Moved and renamed some tool-related files.

(bzr r12785)

1 files changed, 1404 insertions, 0 deletions

diff --git a/src/ui/tools/pen-tool.cpp b/src/ui/tools/pen-tool.cpp
new file mode 100644
index 000000000..4c573a244
--- /dev/null
+++ b/src/ui/tools/pen-tool.cpp
@@ -0,0 +1,1404 @@
+/** \file
+ * Pen event context implementation.
+ */
+
+/*
+ * Authors:
+ *   Lauris Kaplinski <lauris@kaplinski.com>
+ *   bulia byak <buliabyak@users.sf.net>
+ *   Jon A. Cruz <jon@joncruz.org>
+ *
+ * Copyright (C) 2000 Lauris Kaplinski
+ * Copyright (C) 2000-2001 Ximian, Inc.
+ * Copyright (C) 2002 Lauris Kaplinski
+ * Copyright (C) 2004 Monash University
+ *
+ * Released under GNU GPL, read the file 'COPYING' for more information
+ */
+
+#include <gdk/gdkkeysyms.h>
+#include <cstring>
+#include <string>
+
+#include "ui/tools/pen-tool.h"
+#include "sp-namedview.h"
+#include "desktop.h"
+#include "desktop-handles.h"
+#include "selection.h"
+#include "selection-chemistry.h"
+#include "draw-anchor.h"
+#include "message-stack.h"
+#include "message-context.h"
+#include "preferences.h"
+#include "sp-path.h"
+#include "display/sp-canvas.h"
+#include "display/curve.h"
+#include "pixmaps/cursor-pen.xpm"
+#include "display/canvas-bpath.h"
+#include "display/sp-ctrlline.h"
+#include "display/sodipodi-ctrl.h"
+#include <glibmm/i18n.h>
+#include "macros.h"
+#include "context-fns.h"
+#include "tools-switch.h"
+#include "ui/control-manager.h"
+#include "tool-factory.h"
+
+using Inkscape::ControlManager;
+
+namespace Inkscape {
+namespace UI {
+namespace Tools {
+
+static void spdc_pen_set_initial_point(PenTool *pc, Geom::Point const p);
+static void spdc_pen_set_subsequent_point(PenTool *const pc, Geom::Point const p, bool statusbar, guint status = 0);
+static void spdc_pen_set_ctrl(PenTool *pc, Geom::Point const p, guint state);
+static void spdc_pen_finish_segment(PenTool *pc, Geom::Point p, guint state);
+
+static void spdc_pen_finish(PenTool *pc, gboolean closed);
+
+static gint pen_handle_button_press(PenTool *const pc, GdkEventButton const &bevent);
+static gint pen_handle_motion_notify(PenTool *const pc, GdkEventMotion const &mevent);
+static gint pen_handle_button_release(PenTool *const pc, GdkEventButton const &revent);
+static gint pen_handle_2button_press(PenTool *const pc, GdkEventButton const &bevent);
+static gint pen_handle_key_press(PenTool *const pc, GdkEvent *event);
+static void spdc_reset_colors(PenTool *pc);
+
+static void pen_disable_events(PenTool *const pc);
+static void pen_enable_events(PenTool *const pc);
+
+static Geom::Point pen_drag_origin_w(0, 0);
+static bool pen_within_tolerance = false;
+
+static int pen_next_paraxial_direction(const PenTool *const pc, Geom::Point const &pt, Geom::Point const &origin, guint state);
+static void pen_set_to_nearest_horiz_vert(const PenTool *const pc, Geom::Point &pt, guint const state, bool snap);
+
+static int pen_last_paraxial_dir = 0; // last used direction in horizontal/vertical mode; 0 = horizontal, 1 = vertical
+
+namespace {
+	ToolBase* createPenContext() {
+		return new PenTool();
+	}
+
+	bool penContextRegistered = ToolFactory::instance().registerObject("/tools/freehand/pen", createPenContext);
+}
+
+const std::string& PenTool::getPrefsPath() {
+	return PenTool::prefsPath;
+}
+
+const std::string PenTool::prefsPath = "/tools/freehand/pen";
+
+PenTool::PenTool() : FreehandBase() {
+	this->polylines_only = false;
+	this->polylines_paraxial = false;
+	this->expecting_clicks_for_LPE = 0;
+
+    this->cursor_shape = cursor_pen_xpm;
+    this->hot_x = 4;
+    this->hot_y = 4;
+
+    this->npoints = 0;
+    this->mode = MODE_CLICK;
+    this->state = POINT;
+
+    this->c0 = NULL;
+    this->c1 = NULL;
+    this->cl0 = NULL;
+    this->cl1 = NULL;
+
+    this->events_disabled = 0;
+
+    this->num_clicks = 0;
+    this->waiting_LPE = NULL;
+    this->waiting_item = NULL;
+}
+
+PenTool::~PenTool() {
+    if (this->c0) {
+        sp_canvas_item_destroy(this->c0);
+        this->c0 = NULL;
+    }
+    if (this->c1) {
+        sp_canvas_item_destroy(this->c1);
+        this->c1 = NULL;
+    }
+    if (this->cl0) {
+        sp_canvas_item_destroy(this->cl0);
+        this->cl0 = NULL;
+    }
+    if (this->cl1) {
+        sp_canvas_item_destroy(this->cl1);
+        this->cl1 = NULL;
+    }
+
+    if (this->expecting_clicks_for_LPE > 0) {
+        // we received too few clicks to sanely set the parameter path so we remove the LPE from the item
+        this->waiting_item->removeCurrentPathEffect(false);
+    }
+}
+
+void sp_pen_context_set_polyline_mode(PenTool *const pc) {
+    Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+    guint mode = prefs->getInt("/tools/freehand/pen/freehand-mode", 0);
+    pc->polylines_only = (mode == 2 || mode == 3);
+    pc->polylines_paraxial = (mode == 3);
+}
+
+/**
+ * Callback to initialize PenTool object.
+ */
+void PenTool::setup() {
+    FreehandBase::setup();
+
+    ControlManager &mgr = ControlManager::getManager();
+
+    // Pen indicators
+    this->c0 = mgr.createControl(sp_desktop_controls(SP_EVENT_CONTEXT_DESKTOP(this)), Inkscape::CTRL_TYPE_ADJ_HANDLE);
+    mgr.track(this->c0);
+
+    this->c1 = mgr.createControl(sp_desktop_controls(SP_EVENT_CONTEXT_DESKTOP(this)), Inkscape::CTRL_TYPE_ADJ_HANDLE);
+    mgr.track(this->c1);
+
+    this->cl0 = mgr.createControlLine(sp_desktop_controls(SP_EVENT_CONTEXT_DESKTOP(this)));
+    this->cl1 = mgr.createControlLine(sp_desktop_controls(SP_EVENT_CONTEXT_DESKTOP(this)));
+
+    sp_canvas_item_hide(this->c0);
+    sp_canvas_item_hide(this->c1);
+    sp_canvas_item_hide(this->cl0);
+    sp_canvas_item_hide(this->cl1);
+
+    sp_event_context_read(this, "mode");
+
+    this->anchor_statusbar = false;
+
+    sp_pen_context_set_polyline_mode(this);
+
+    Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+    if (prefs->getBool("/tools/freehand/pen/selcue")) {
+        this->enableSelectionCue();
+    }
+}
+
+static void pen_cancel (PenTool *const pc)
+{
+    pc->num_clicks = 0;
+    pc->state = PenTool::STOP;
+    spdc_reset_colors(pc);
+    sp_canvas_item_hide(pc->c0);
+    sp_canvas_item_hide(pc->c1);
+    sp_canvas_item_hide(pc->cl0);
+    sp_canvas_item_hide(pc->cl1);
+    pc->message_context->clear();
+    pc->message_context->flash(Inkscape::NORMAL_MESSAGE, _("Drawing cancelled"));
+
+    pc->desktop->canvas->endForcedFullRedraws();
+}
+
+/**
+ * Finalization callback.
+ */
+void PenTool::finish() {
+    sp_event_context_discard_delayed_snap_event(this);
+
+    if (this->npoints != 0) {
+        pen_cancel(this);
+    }
+
+    FreehandBase::finish();
+}
+
+/**
+ * Callback that sets key to value in pen context.
+ */
+void PenTool::set(const Inkscape::Preferences::Entry& val) {
+    Glib::ustring name = val.getEntryName();
+
+    if (name == "mode") {
+        if ( val.getString() == "drag" ) {
+            this->mode = MODE_DRAG;
+        } else {
+            this->mode = MODE_CLICK;
+        }
+    }
+}
+
+/**
+ * Snaps new node relative to the previous node.
+ */
+static void spdc_endpoint_snap(PenTool const *const pc, Geom::Point &p, guint const state)
+{
+    if ((state & GDK_CONTROL_MASK) && !pc->polylines_paraxial) { //CTRL enables angular snapping
+        if (pc->npoints > 0) {
+            spdc_endpoint_snap_rotation(pc, p, pc->p[0], state);
+        }
+    } else {
+        // We cannot use shift here to disable snapping because the shift-key is already used
+        // to toggle the paraxial direction; if the user wants to disable snapping (s)he will
+        // have to use the %-key, the menu, or the snap toolbar
+        if ((pc->npoints > 0) && pc->polylines_paraxial) {
+            // snap constrained
+            pen_set_to_nearest_horiz_vert(pc, p, state, true);
+        } else {
+            // snap freely
+            boost::optional<Geom::Point> origin = pc->npoints > 0 ? pc->p[0] : boost::optional<Geom::Point>();
+            spdc_endpoint_snap_free(pc, p, origin, state); // pass the origin, to allow for perpendicular / tangential snapping
+        }
+    }
+}
+
+/**
+ * Snaps new node's handle relative to the new node.
+ */
+static void spdc_endpoint_snap_handle(PenTool const *const pc, Geom::Point &p, guint const state)
+{
+    g_return_if_fail(( pc->npoints == 2 ||
+                       pc->npoints == 5   ));
+
+    if ((state & GDK_CONTROL_MASK)) { //CTRL enables angular snapping
+        spdc_endpoint_snap_rotation(pc, p, pc->p[pc->npoints - 2], state);
+    } else {
+        if (!(state & GDK_SHIFT_MASK)) { //SHIFT disables all snapping, except the angular snapping above
+            boost::optional<Geom::Point> origin = pc->p[pc->npoints - 2];
+            spdc_endpoint_snap_free(pc, p, origin, state);
+        }
+    }
+}
+
+bool PenTool::item_handler(SPItem* item, GdkEvent* event) {
+    gint ret = FALSE;
+
+    switch (event->type) {
+        case GDK_BUTTON_PRESS:
+            ret = pen_handle_button_press(this, event->button);
+            break;
+        case GDK_BUTTON_RELEASE:
+            ret = pen_handle_button_release(this, event->button);
+            break;
+        default:
+            break;
+    }
+
+    if (!ret) {
+    	ret = FreehandBase::item_handler(item, event);
+    }
+
+    return ret;
+}
+
+/**
+ * Callback to handle all pen events.
+ */
+bool PenTool::root_handler(GdkEvent* event) {
+    gint ret = FALSE;
+
+    switch (event->type) {
+        case GDK_BUTTON_PRESS:
+            ret = pen_handle_button_press(this, event->button);
+            break;
+
+        case GDK_MOTION_NOTIFY:
+            ret = pen_handle_motion_notify(this, event->motion);
+            break;
+
+        case GDK_BUTTON_RELEASE:
+            ret = pen_handle_button_release(this, event->button);
+            break;
+
+        case GDK_2BUTTON_PRESS:
+            ret = pen_handle_2button_press(this, event->button);
+            break;
+
+        case GDK_KEY_PRESS:
+            ret = pen_handle_key_press(this, event);
+            break;
+
+        default:
+            break;
+    }
+
+    if (!ret) {
+    	ret = FreehandBase::root_handler(event);
+    }
+
+    return ret;
+}
+
+/**
+ * Handle mouse button press event.
+ */
+static gint pen_handle_button_press(PenTool *const pc, GdkEventButton const &bevent)
+{
+    if (pc->events_disabled) {
+        // skip event processing if events are disabled
+        return FALSE;
+    }
+
+    FreehandBase * const dc = SP_DRAW_CONTEXT(pc);
+    SPDesktop * const desktop = SP_EVENT_CONTEXT_DESKTOP(dc);
+    Geom::Point const event_w(bevent.x, bevent.y);
+    Geom::Point event_dt(desktop->w2d(event_w));
+    ToolBase *event_context = SP_EVENT_CONTEXT(pc);
+
+    gint ret = FALSE;
+    if (bevent.button == 1 && !event_context->space_panning
+        // make sure this is not the last click for a waiting LPE (otherwise we want to finish the path)
+        && pc->expecting_clicks_for_LPE != 1) {
+
+        if (Inkscape::have_viable_layer(desktop, dc->message_context) == false) {
+            return TRUE;
+        }
+
+        if (!pc->grab ) {
+            // Grab mouse, so release will not pass unnoticed
+            pc->grab = SP_CANVAS_ITEM(desktop->acetate);
+            sp_canvas_item_grab(pc->grab, ( GDK_KEY_PRESS_MASK | GDK_BUTTON_PRESS_MASK   |
+                                            GDK_BUTTON_RELEASE_MASK |
+                                            GDK_POINTER_MOTION_MASK  ),
+                                NULL, bevent.time);
+        }
+
+        pen_drag_origin_w = event_w;
+        pen_within_tolerance = true;
+
+        // Test whether we hit any anchor.
+        SPDrawAnchor * const anchor = spdc_test_inside(pc, event_w);
+
+        switch (pc->mode) {
+            case PenTool::MODE_CLICK:
+                // In click mode we add point on release
+                switch (pc->state) {
+                    case PenTool::POINT:
+                    case PenTool::CONTROL:
+                    case PenTool::CLOSE:
+                        break;
+                    case PenTool::STOP:
+                        // This is allowed, if we just canceled curve
+                        pc->state = PenTool::POINT;
+                        break;
+                    default:
+                        break;
+                }
+                break;
+            case PenTool::MODE_DRAG:
+                switch (pc->state) {
+                    case PenTool::STOP:
+                        // This is allowed, if we just canceled curve
+                    case PenTool::POINT:
+                        if (pc->npoints == 0) {
+
+                            Geom::Point p;
+                            if ((bevent.state & GDK_CONTROL_MASK) && (pc->polylines_only || pc->polylines_paraxial)) {
+                                p = event_dt;
+                                if (!(bevent.state & GDK_SHIFT_MASK)) {
+                                    SnapManager &m = desktop->namedview->snap_manager;
+                                    m.setup(desktop);
+                                    m.freeSnapReturnByRef(p, Inkscape::SNAPSOURCE_NODE_HANDLE);
+                                    m.unSetup();
+                                }
+                              spdc_create_single_dot(event_context, p, "/tools/freehand/pen", bevent.state);
+                              ret = TRUE;
+                              break;
+                            }
+
+                            // TODO: Perhaps it would be nicer to rearrange the following case
+                            // distinction so that the case of a waiting LPE is treated separately
+
+                            // Set start anchor
+                            pc->sa = anchor;
+                            if (anchor && !sp_pen_context_has_waiting_LPE(pc)) {
+                                // Adjust point to anchor if needed; if we have a waiting LPE, we need
+                                // a fresh path to be created so don't continue an existing one
+                                p = anchor->dp;
+                                desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Continuing selected path"));
+                            } else {
+                                // This is the first click of a new curve; deselect item so that
+                                // this curve is not combined with it (unless it is drawn from its
+                                // anchor, which is handled by the sibling branch above)
+                                Inkscape::Selection * const selection = sp_desktop_selection(desktop);
+                                if (!(bevent.state & GDK_SHIFT_MASK) || sp_pen_context_has_waiting_LPE(pc)) {
+                                    // if we have a waiting LPE, we need a fresh path to be created
+                                    // so don't append to an existing one
+                                    selection->clear();
+                                    desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Creating new path"));
+                                } else if (selection->singleItem() && SP_IS_PATH(selection->singleItem())) {
+                                    desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Appending to selected path"));
+                                }
+
+                                // Create green anchor
+                                p = event_dt;
+                                spdc_endpoint_snap(pc, p, bevent.state);
+                                pc->green_anchor = sp_draw_anchor_new(pc, pc->green_curve, TRUE, p);
+                            }
+                            spdc_pen_set_initial_point(pc, p);
+                        } else {
+
+                            // Set end anchor
+                            pc->ea = anchor;
+                            Geom::Point p;
+                            if (anchor) {
+                                p = anchor->dp;
+                                // we hit an anchor, will finish the curve (either with or without closing)
+                                // in release handler
+                                pc->state = PenTool::CLOSE;
+
+                                if (pc->green_anchor && pc->green_anchor->active) {
+                                    // we clicked on the current curve start, so close it even if
+                                    // we drag a handle away from it
+                                    dc->green_closed = TRUE;
+                                }
+                                ret = TRUE;
+                                break;
+
+                            } else {
+                                p = event_dt;
+                                spdc_endpoint_snap(pc, p, bevent.state); // Snap node only if not hitting anchor.
+                                spdc_pen_set_subsequent_point(pc, p, true);
+                            }
+                        }
+
+                        pc->state = pc->polylines_only ? PenTool::POINT : PenTool::CONTROL;
+                        ret = TRUE;
+                        break;
+                    case PenTool::CONTROL:
+                        g_warning("Button down in CONTROL state");
+                        break;
+                    case PenTool::CLOSE:
+                        g_warning("Button down in CLOSE state");
+                        break;
+                    default:
+                        break;
+                }
+                break;
+            default:
+                break;
+        }
+    } else if (pc->expecting_clicks_for_LPE == 1 && pc->npoints != 0) {
+        // when the last click for a waiting LPE occurs we want to finish the path
+        spdc_pen_finish_segment(pc, event_dt, bevent.state);
+        if (pc->green_closed) {
+            // finishing at the start anchor, close curve
+            spdc_pen_finish(pc, TRUE);
+        } else {
+            // finishing at some other anchor, finish curve but not close
+            spdc_pen_finish(pc, FALSE);
+        }
+
+        ret = TRUE;
+    } else if (bevent.button == 3 && pc->npoints != 0) {
+        // right click - finish path
+        spdc_pen_finish(pc, FALSE);
+        ret = TRUE;
+    }
+
+    if (pc->expecting_clicks_for_LPE > 0) {
+        --pc->expecting_clicks_for_LPE;
+    }
+
+    return ret;
+}
+
+/**
+ * Handle motion_notify event.
+ */
+static gint pen_handle_motion_notify(PenTool *const pc, GdkEventMotion const &mevent)
+{
+    gint ret = FALSE;
+
+    ToolBase *event_context = SP_EVENT_CONTEXT(pc);
+    SPDesktop * const dt = SP_EVENT_CONTEXT_DESKTOP(event_context);
+
+    if (event_context->space_panning || mevent.state & GDK_BUTTON2_MASK || mevent.state & GDK_BUTTON3_MASK) {
+        // allow scrolling
+        return FALSE;
+    }
+
+    if (pc->events_disabled) {
+        // skip motion events if pen events are disabled
+        return FALSE;
+    }
+
+    Geom::Point const event_w(mevent.x,
+                            mevent.y);
+    if (pen_within_tolerance) {
+        Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+        gint const tolerance = prefs->getIntLimited("/options/dragtolerance/value", 0, 0, 100);
+        if ( Geom::LInfty( event_w - pen_drag_origin_w ) < tolerance ) {
+            return FALSE;   // Do not drag if we're within tolerance from origin.
+        }
+    }
+    // Once the user has moved farther than tolerance from the original location
+    // (indicating they intend to move the object, not click), then always process the
+    // motion notify coordinates as given (no snapping back to origin)
+    pen_within_tolerance = false;
+
+    // Find desktop coordinates
+    Geom::Point p = dt->w2d(event_w);
+
+    // Test, whether we hit any anchor
+    SPDrawAnchor *anchor = spdc_test_inside(pc, event_w);
+
+    switch (pc->mode) {
+        case PenTool::MODE_CLICK:
+            switch (pc->state) {
+                case PenTool::POINT:
+                    if ( pc->npoints != 0 ) {
+                        // Only set point, if we are already appending
+                        spdc_endpoint_snap(pc, p, mevent.state);
+                        spdc_pen_set_subsequent_point(pc, p, true);
+                        ret = TRUE;
+                    } else if (!sp_event_context_knot_mouseover(pc)) {
+                        SnapManager &m = dt->namedview->snap_manager;
+                        m.setup(dt);
+                        m.preSnap(Inkscape::SnapCandidatePoint(p, Inkscape::SNAPSOURCE_NODE_HANDLE));
+                        m.unSetup();
+                    }
+                    break;
+                case PenTool::CONTROL:
+                case PenTool::CLOSE:
+                    // Placing controls is last operation in CLOSE state
+                    spdc_endpoint_snap(pc, p, mevent.state);
+                    spdc_pen_set_ctrl(pc, p, mevent.state);
+                    ret = TRUE;
+                    break;
+                case PenTool::STOP:
+                    // This is perfectly valid
+                    break;
+                default:
+                    break;
+            }
+            break;
+        case PenTool::MODE_DRAG:
+            switch (pc->state) {
+                case PenTool::POINT:
+                    if ( pc->npoints > 0 ) {
+                        // Only set point, if we are already appending
+
+                        if (!anchor) {   // Snap node only if not hitting anchor
+                            spdc_endpoint_snap(pc, p, mevent.state);
+                            spdc_pen_set_subsequent_point(pc, p, true, mevent.state);
+                        } else {
+                            spdc_pen_set_subsequent_point(pc, anchor->dp, false, mevent.state);
+                        }
+
+                        if (anchor && !pc->anchor_statusbar) {
+                            pc->message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Click</b> or <b>click and drag</b> to close and finish the path."));
+                            pc->anchor_statusbar = true;
+                        } else if (!anchor && pc->anchor_statusbar) {
+                            pc->message_context->clear();
+                            pc->anchor_statusbar = false;
+                        }
+
+                        ret = TRUE;
+                    } else {
+                        if (anchor && !pc->anchor_statusbar) {
+                            pc->message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Click</b> or <b>click and drag</b> to continue the path from this point."));
+                            pc->anchor_statusbar = true;
+                        } else if (!anchor && pc->anchor_statusbar) {
+                            pc->message_context->clear();
+                            pc->anchor_statusbar = false;
+                        }
+                        if (!sp_event_context_knot_mouseover(pc)) {
+                            SnapManager &m = dt->namedview->snap_manager;
+                            m.setup(dt);
+                            m.preSnap(Inkscape::SnapCandidatePoint(p, Inkscape::SNAPSOURCE_NODE_HANDLE));
+                            m.unSetup();
+                        }
+                    }
+                    break;
+                case PenTool::CONTROL:
+                case PenTool::CLOSE:
+                    // Placing controls is last operation in CLOSE state
+
+                    // snap the handle
+                    spdc_endpoint_snap_handle(pc, p, mevent.state);
+
+                    if (!pc->polylines_only) {
+                        spdc_pen_set_ctrl(pc, p, mevent.state);
+                    } else {
+                        spdc_pen_set_ctrl(pc, pc->p[1], mevent.state);
+                    }
+                    gobble_motion_events(GDK_BUTTON1_MASK);
+                    ret = TRUE;
+                    break;
+                case PenTool::STOP:
+                    // This is perfectly valid
+                    break;
+                default:
+                    if (!sp_event_context_knot_mouseover(pc)) {
+                        SnapManager &m = dt->namedview->snap_manager;
+                        m.setup(dt);
+                        m.preSnap(Inkscape::SnapCandidatePoint(p, Inkscape::SNAPSOURCE_NODE_HANDLE));
+                        m.unSetup();
+                    }
+                    break;
+            }
+            break;
+        default:
+            break;
+    }
+    return ret;
+}
+
+/**
+ * Handle mouse button release event.
+ */
+static gint pen_handle_button_release(PenTool *const pc, GdkEventButton const &revent)
+{
+    if (pc->events_disabled) {
+        // skip event processing if events are disabled
+        return FALSE;
+    }
+
+    gint ret = FALSE;
+    ToolBase *event_context = SP_EVENT_CONTEXT(pc);
+    if ( revent.button == 1  && !event_context->space_panning) {
+
+        FreehandBase *dc = SP_DRAW_CONTEXT (pc);
+
+        Geom::Point const event_w(revent.x,
+                                revent.y);
+        // Find desktop coordinates
+        Geom::Point p = pc->desktop->w2d(event_w);
+
+        // Test whether we hit any anchor.
+        SPDrawAnchor *anchor = spdc_test_inside(pc, event_w);
+
+        switch (pc->mode) {
+            case PenTool::MODE_CLICK:
+                switch (pc->state) {
+                    case PenTool::POINT:
+                        if ( pc->npoints == 0 ) {
+                            // Start new thread only with button release
+                            if (anchor) {
+                                p = anchor->dp;
+                            }
+                            pc->sa = anchor;
+                            spdc_pen_set_initial_point(pc, p);
+                        } else {
+                            // Set end anchor here
+                            pc->ea = anchor;
+                            if (anchor) {
+                                p = anchor->dp;
+                            }
+                        }
+                        pc->state = PenTool::CONTROL;
+                        ret = TRUE;
+                        break;
+                    case PenTool::CONTROL:
+                        // End current segment
+                        spdc_endpoint_snap(pc, p, revent.state);
+                        spdc_pen_finish_segment(pc, p, revent.state);
+                        pc->state = PenTool::POINT;
+                        ret = TRUE;
+                        break;
+                    case PenTool::CLOSE:
+                        // End current segment
+                        if (!anchor) {   // Snap node only if not hitting anchor
+                            spdc_endpoint_snap(pc, p, revent.state);
+                        }
+                        spdc_pen_finish_segment(pc, p, revent.state);
+                        spdc_pen_finish(pc, TRUE);
+                        pc->state = PenTool::POINT;
+                        ret = TRUE;
+                        break;
+                    case PenTool::STOP:
+                        // This is allowed, if we just canceled curve
+                        pc->state = PenTool::POINT;
+                        ret = TRUE;
+                        break;
+                    default:
+                        break;
+                }
+                break;
+            case PenTool::MODE_DRAG:
+                switch (pc->state) {
+                    case PenTool::POINT:
+                    case PenTool::CONTROL:
+                        spdc_endpoint_snap(pc, p, revent.state);
+                        spdc_pen_finish_segment(pc, p, revent.state);
+                        break;
+                    case PenTool::CLOSE:
+                        spdc_endpoint_snap(pc, p, revent.state);
+                        spdc_pen_finish_segment(pc, p, revent.state);
+                        if (pc->green_closed) {
+                            // finishing at the start anchor, close curve
+                            spdc_pen_finish(pc, TRUE);
+                        } else {
+                            // finishing at some other anchor, finish curve but not close
+                            spdc_pen_finish(pc, FALSE);
+                        }
+                        break;
+                    case PenTool::STOP:
+                        // This is allowed, if we just cancelled curve
+                        break;
+                    default:
+                        break;
+                }
+                pc->state = PenTool::POINT;
+                ret = TRUE;
+                break;
+            default:
+                break;
+        }
+
+        if (pc->grab) {
+            // Release grab now
+            sp_canvas_item_ungrab(pc->grab, revent.time);
+            pc->grab = NULL;
+        }
+
+        ret = TRUE;
+
+        dc->green_closed = FALSE;
+    }
+
+    // TODO: can we be sure that the path was created correctly?
+    // TODO: should we offer an option to collect the clicks in a list?
+    if (pc->expecting_clicks_for_LPE == 0 && sp_pen_context_has_waiting_LPE(pc)) {
+        sp_pen_context_set_polyline_mode(pc);
+
+        ToolBase *ec = SP_EVENT_CONTEXT(pc);
+        Inkscape::Selection *selection = sp_desktop_selection (ec->desktop);
+
+        if (pc->waiting_LPE) {
+            // we have an already created LPE waiting for a path
+            pc->waiting_LPE->acceptParamPath(SP_PATH(selection->singleItem()));
+            selection->add(SP_OBJECT(pc->waiting_item));
+            pc->waiting_LPE = NULL;
+        } else {
+            // the case that we need to create a new LPE and apply it to the just-drawn path is
+            // handled in spdc_check_for_and_apply_waiting_LPE() in draw-context.cpp
+        }
+    }
+
+    return ret;
+}
+
+static gint pen_handle_2button_press(PenTool *const pc, GdkEventButton const &bevent)
+{
+    gint ret = FALSE;
+    // only end on LMB double click. Otherwise horizontal scrolling causes ending of the path
+    if (pc->npoints != 0 && bevent.button == 1) {
+        spdc_pen_finish(pc, FALSE);
+        ret = TRUE;
+    }
+    return ret;
+}
+
+static void pen_redraw_all (PenTool *const pc)
+{
+    // green
+    if (pc->green_bpaths) {
+        // remove old piecewise green canvasitems
+        while (pc->green_bpaths) {
+            sp_canvas_item_destroy(SP_CANVAS_ITEM(pc->green_bpaths->data));
+            pc->green_bpaths = g_slist_remove(pc->green_bpaths, pc->green_bpaths->data);
+        }
+        // one canvas bpath for all of green_curve
+        SPCanvasItem *cshape = sp_canvas_bpath_new(sp_desktop_sketch(pc->desktop), pc->green_curve);
+        sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cshape), pc->green_color, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
+        sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(cshape), 0, SP_WIND_RULE_NONZERO);
+
+        pc->green_bpaths = g_slist_prepend(pc->green_bpaths, cshape);
+    }
+
+    if (pc->green_anchor)
+        SP_CTRL(pc->green_anchor->ctrl)->moveto(pc->green_anchor->dp);
+
+    pc->red_curve->reset();
+    pc->red_curve->moveto(pc->p[0]);
+    pc->red_curve->curveto(pc->p[1], pc->p[2], pc->p[3]);
+    sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->red_curve);
+
+    // handles
+    if (pc->p[0] != pc->p[1]) {
+        SP_CTRL(pc->c1)->moveto(pc->p[1]);
+        pc->cl1->setCoords(pc->p[0], pc->p[1]);
+        sp_canvas_item_show(pc->c1);
+        sp_canvas_item_show(pc->cl1);
+    } else {
+        sp_canvas_item_hide(pc->c1);
+        sp_canvas_item_hide(pc->cl1);
+    }
+
+    Geom::Curve const * last_seg = pc->green_curve->last_segment();
+    if (last_seg) {
+        Geom::CubicBezier const * cubic = dynamic_cast<Geom::CubicBezier const *>( last_seg );
+        if ( cubic &&
+             (*cubic)[2] != pc->p[0] )
+        {
+            Geom::Point p2 = (*cubic)[2];
+            SP_CTRL(pc->c0)->moveto(p2);
+            pc->cl0->setCoords(p2, pc->p[0]);
+            sp_canvas_item_show(pc->c0);
+            sp_canvas_item_show(pc->cl0);
+        } else {
+            sp_canvas_item_hide(pc->c0);
+            sp_canvas_item_hide(pc->cl0);
+        }
+    }
+}
+
+static void pen_lastpoint_move (PenTool *const pc, gdouble x, gdouble y)
+{
+    if (pc->npoints != 5)
+        return;
+
+    // green
+    if (!pc->green_curve->is_empty()) {
+        pc->green_curve->last_point_additive_move( Geom::Point(x,y) );
+    } else {
+        // start anchor too
+        if (pc->green_anchor) {
+            pc->green_anchor->dp += Geom::Point(x, y);
+        }
+    }
+
+    // red
+    pc->p[0] += Geom::Point(x, y);
+    pc->p[1] += Geom::Point(x, y);
+    pen_redraw_all(pc);
+}
+
+static void pen_lastpoint_move_screen (PenTool *const pc, gdouble x, gdouble y)
+{
+    pen_lastpoint_move (pc, x / pc->desktop->current_zoom(), y / pc->desktop->current_zoom());
+}
+
+static void pen_lastpoint_tocurve (PenTool *const pc)
+{
+    if (pc->npoints != 5)
+        return;
+
+    Geom::CubicBezier const * cubic = dynamic_cast<Geom::CubicBezier const *>( pc->green_curve->last_segment() );
+    if ( cubic ) {
+        pc->p[1] = pc->p[0] + (Geom::Point)( (*cubic)[3] - (*cubic)[2] );
+    } else {
+        pc->p[1] = pc->p[0] + (1./3)*(pc->p[3] - pc->p[0]);
+    }
+
+    pen_redraw_all(pc);
+}
+
+static void pen_lastpoint_toline (PenTool *const pc)
+{
+    if (pc->npoints != 5)
+        return;
+
+    pc->p[1] = pc->p[0];
+
+    pen_redraw_all(pc);
+}
+
+
+static gint pen_handle_key_press(PenTool *const pc, GdkEvent *event)
+{
+
+    gint ret = FALSE;
+    Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+    gdouble const nudge = prefs->getDoubleLimited("/options/nudgedistance/value", 2, 0, 1000, "px"); // in px
+
+    switch (get_group0_keyval (&event->key)) {
+
+        case GDK_KEY_Left: // move last point left
+        case GDK_KEY_KP_Left:
+            if (!MOD__CTRL(event)) { // not ctrl
+                if (MOD__ALT(event)) { // alt
+                    if (MOD__SHIFT(event)) pen_lastpoint_move_screen(pc, -10, 0); // shift
+                    else pen_lastpoint_move_screen(pc, -1, 0); // no shift
+                }
+                else { // no alt
+                    if (MOD__SHIFT(event)) pen_lastpoint_move(pc, -10*nudge, 0); // shift
+                    else pen_lastpoint_move(pc, -nudge, 0); // no shift
+                }
+                ret = TRUE;
+            }
+            break;
+        case GDK_KEY_Up: // move last point up
+        case GDK_KEY_KP_Up:
+            if (!MOD__CTRL(event)) { // not ctrl
+                if (MOD__ALT(event)) { // alt
+                    if (MOD__SHIFT(event)) pen_lastpoint_move_screen(pc, 0, 10); // shift
+                    else pen_lastpoint_move_screen(pc, 0, 1); // no shift
+                }
+                else { // no alt
+                    if (MOD__SHIFT(event)) pen_lastpoint_move(pc, 0, 10*nudge); // shift
+                    else pen_lastpoint_move(pc, 0, nudge); // no shift
+                }
+                ret = TRUE;
+            }
+            break;
+        case GDK_KEY_Right: // move last point right
+        case GDK_KEY_KP_Right:
+            if (!MOD__CTRL(event)) { // not ctrl
+                if (MOD__ALT(event)) { // alt
+                    if (MOD__SHIFT(event)) pen_lastpoint_move_screen(pc, 10, 0); // shift
+                    else pen_lastpoint_move_screen(pc, 1, 0); // no shift
+                }
+                else { // no alt
+                    if (MOD__SHIFT(event)) pen_lastpoint_move(pc, 10*nudge, 0); // shift
+                    else pen_lastpoint_move(pc, nudge, 0); // no shift
+                }
+                ret = TRUE;
+            }
+            break;
+        case GDK_KEY_Down: // move last point down
+        case GDK_KEY_KP_Down:
+            if (!MOD__CTRL(event)) { // not ctrl
+                if (MOD__ALT(event)) { // alt
+                    if (MOD__SHIFT(event)) pen_lastpoint_move_screen(pc, 0, -10); // shift
+                    else pen_lastpoint_move_screen(pc, 0, -1); // no shift
+                }
+                else { // no alt
+                    if (MOD__SHIFT(event)) pen_lastpoint_move(pc, 0, -10*nudge); // shift
+                    else pen_lastpoint_move(pc, 0, -nudge); // no shift
+                }
+                ret = TRUE;
+            }
+            break;
+
+/*TODO: this is not yet enabled?? looks like some traces of the Geometry tool
+        case GDK_KEY_P:
+        case GDK_KEY_p:
+            if (MOD__SHIFT_ONLY(event)) {
+                sp_pen_context_wait_for_LPE_mouse_clicks(pc, Inkscape::LivePathEffect::PARALLEL, 2);
+                ret = TRUE;
+            }
+            break;
+
+        case GDK_KEY_C:
+        case GDK_KEY_c:
+            if (MOD__SHIFT_ONLY(event)) {
+                sp_pen_context_wait_for_LPE_mouse_clicks(pc, Inkscape::LivePathEffect::CIRCLE_3PTS, 3);
+                ret = TRUE;
+            }
+            break;
+
+        case GDK_KEY_B:
+        case GDK_KEY_b:
+            if (MOD__SHIFT_ONLY(event)) {
+                sp_pen_context_wait_for_LPE_mouse_clicks(pc, Inkscape::LivePathEffect::PERP_BISECTOR, 2);
+                ret = TRUE;
+            }
+            break;
+
+        case GDK_KEY_A:
+        case GDK_KEY_a:
+            if (MOD__SHIFT_ONLY(event)) {
+                sp_pen_context_wait_for_LPE_mouse_clicks(pc, Inkscape::LivePathEffect::ANGLE_BISECTOR, 3);
+                ret = TRUE;
+            }
+            break;
+*/
+
+        case GDK_KEY_U:
+        case GDK_KEY_u:
+            if (MOD__SHIFT_ONLY(event)) {
+                pen_lastpoint_tocurve(pc);
+                ret = TRUE;
+            }
+            break;
+        case GDK_KEY_L:
+        case GDK_KEY_l:
+            if (MOD__SHIFT_ONLY(event)) {
+                pen_lastpoint_toline(pc);
+                ret = TRUE;
+            }
+            break;
+
+        case GDK_KEY_Return:
+        case GDK_KEY_KP_Enter:
+            if (pc->npoints != 0) {
+                spdc_pen_finish(pc, FALSE);
+                ret = TRUE;
+            }
+            break;
+        case GDK_KEY_Escape:
+            if (pc->npoints != 0) {
+                // if drawing, cancel, otherwise pass it up for deselecting
+                pen_cancel (pc);
+                ret = TRUE;
+            }
+            break;
+        case GDK_KEY_z:
+        case GDK_KEY_Z:
+            if (MOD__CTRL_ONLY(event) && pc->npoints != 0) {
+                // if drawing, cancel, otherwise pass it up for undo
+                pen_cancel (pc);
+                ret = TRUE;
+            }
+            break;
+        case GDK_KEY_g:
+        case GDK_KEY_G:
+            if (MOD__SHIFT_ONLY(event)) {
+                sp_selection_to_guides(SP_EVENT_CONTEXT(pc)->desktop);
+                ret = true;
+            }
+            break;
+        case GDK_KEY_BackSpace:
+        case GDK_KEY_Delete:
+        case GDK_KEY_KP_Delete:
+            if ( pc->green_curve->is_empty() || (pc->green_curve->last_segment() == NULL) ) {
+                if (!pc->red_curve->is_empty()) {
+                    pen_cancel (pc);
+                    ret = TRUE;
+                } else {
+                    // do nothing; this event should be handled upstream
+                }
+            } else {
+                // Reset red curve
+                pc->red_curve->reset();
+                // Destroy topmost green bpath
+                if (pc->green_bpaths) {
+                    if (pc->green_bpaths->data)
+                        sp_canvas_item_destroy(SP_CANVAS_ITEM(pc->green_bpaths->data));
+                    pc->green_bpaths = g_slist_remove(pc->green_bpaths, pc->green_bpaths->data);
+                }
+                // Get last segment
+                if ( pc->green_curve->is_empty() ) {
+                    g_warning("pen_handle_key_press, case GDK_KP_Delete: Green curve is empty");
+                    break;
+                }
+                // The code below assumes that pc->green_curve has only ONE path !
+                Geom::Curve const * crv = pc->green_curve->last_segment();
+                pc->p[0] = crv->initialPoint();
+                if ( Geom::CubicBezier const * cubic = dynamic_cast<Geom::CubicBezier const *>(crv)) {
+                    pc->p[1] = (*cubic)[1];
+                } else {
+                    pc->p[1] = pc->p[0];
+                }
+                Geom::Point const pt(( pc->npoints < 4
+                                     ? (Geom::Point)(crv->finalPoint())
+                                     : pc->p[3] ));
+                pc->npoints = 2;
+                pc->green_curve->backspace();
+                sp_canvas_item_hide(pc->c0);
+                sp_canvas_item_hide(pc->c1);
+                sp_canvas_item_hide(pc->cl0);
+                sp_canvas_item_hide(pc->cl1);
+                pc->state = PenTool::POINT;
+                spdc_pen_set_subsequent_point(pc, pt, true);
+                pen_last_paraxial_dir = !pen_last_paraxial_dir;
+                ret = TRUE;
+            }
+            break;
+        default:
+            break;
+    }
+    return ret;
+}
+
+static void spdc_reset_colors(PenTool *pc)
+{
+    // Red
+    pc->red_curve->reset();
+    sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), NULL);
+    // Blue
+    pc->blue_curve->reset();
+    sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->blue_bpath), NULL);
+    // Green
+    while (pc->green_bpaths) {
+        sp_canvas_item_destroy(SP_CANVAS_ITEM(pc->green_bpaths->data));
+        pc->green_bpaths = g_slist_remove(pc->green_bpaths, pc->green_bpaths->data);
+    }
+    pc->green_curve->reset();
+    if (pc->green_anchor) {
+        pc->green_anchor = sp_draw_anchor_destroy(pc->green_anchor);
+    }
+    pc->sa = NULL;
+    pc->ea = NULL;
+    pc->npoints = 0;
+    pc->red_curve_is_valid = false;
+}
+
+
+static void spdc_pen_set_initial_point(PenTool *const pc, Geom::Point const p)
+{
+    g_assert( pc->npoints == 0 );
+
+    pc->p[0] = p;
+    pc->p[1] = p;
+    pc->npoints = 2;
+    sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), NULL);
+
+    pc->desktop->canvas->forceFullRedrawAfterInterruptions(5);
+}
+
+/**
+ * Show the status message for the current line/curve segment.
+ * This type of message always shows angle/distance as the last
+ * two parameters ("angle %3.2f&#176;, distance %s").
+ */
+static void spdc_pen_set_angle_distance_status_message(PenTool *const pc, Geom::Point const p, int pc_point_to_compare, gchar const *message)
+{
+    g_assert(pc != NULL);
+    g_assert((pc_point_to_compare == 0) || (pc_point_to_compare == 3)); // exclude control handles
+    g_assert(message != NULL);
+
+    SPDesktop *desktop = SP_EVENT_CONTEXT(pc)->desktop;
+    Geom::Point rel = p - pc->p[pc_point_to_compare];
+    Inkscape::Util::Quantity q = Inkscape::Util::Quantity(Geom::L2(rel), "px");
+    GString *dist = g_string_new(q.string(desktop->namedview->doc_units).c_str());
+    double angle = atan2(rel[Geom::Y], rel[Geom::X]) * 180 / M_PI;
+    Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+    if (prefs->getBool("/options/compassangledisplay/value", 0) != 0) {
+        angle = 90 - angle;
+        if (angle < 0) {
+            angle += 360;
+        }
+    }
+
+    pc->message_context->setF(Inkscape::IMMEDIATE_MESSAGE, message, angle, dist->str);
+    g_string_free(dist, FALSE);
+}
+
+static void spdc_pen_set_subsequent_point(PenTool *const pc, Geom::Point const p, bool statusbar, guint status)
+{
+    g_assert( pc->npoints != 0 );
+    // todo: Check callers to see whether 2 <= npoints is guaranteed.
+
+    pc->p[2] = p;
+    pc->p[3] = p;
+    pc->p[4] = p;
+    pc->npoints = 5;
+    pc->red_curve->reset();
+    bool is_curve;
+    pc->red_curve->moveto(pc->p[0]);
+    if (pc->polylines_paraxial && !statusbar) {
+        // we are drawing horizontal/vertical lines and hit an anchor;
+        Geom::Point const origin = pc->p[0];
+        // if the previous point and the anchor are not aligned either horizontally or vertically...
+        if ((abs(p[Geom::X] - origin[Geom::X]) > 1e-9) && (abs(p[Geom::Y] - origin[Geom::Y]) > 1e-9)) {
+            // ...then we should draw an L-shaped path, consisting of two paraxial segments
+            Geom::Point intermed = p;
+            pen_set_to_nearest_horiz_vert(pc, intermed, status, false);
+            pc->red_curve->lineto(intermed);
+        }
+        pc->red_curve->lineto(p);
+        is_curve = false;
+    } else {
+        // one of the 'regular' modes
+        if (pc->p[1] != pc->p[0]) {
+            pc->red_curve->curveto(pc->p[1], p, p);
+            is_curve = true;
+        } else {
+            pc->red_curve->lineto(p);
+            is_curve = false;
+        }
+    }
+
+    sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->red_curve);
+
+    if (statusbar) {
+        gchar *message = is_curve ?
+            _("<b>Curve segment</b>: angle %3.2f&#176;, distance %s; with <b>Ctrl</b> to snap angle, <b>Enter</b> to finish the path" ):
+            _("<b>Line segment</b>: angle %3.2f&#176;, distance %s; with <b>Ctrl</b> to snap angle, <b>Enter</b> to finish the path");
+        spdc_pen_set_angle_distance_status_message(pc, p, 0, message);
+    }
+}
+
+static void spdc_pen_set_ctrl(PenTool *const pc, Geom::Point const p, guint const state)
+{
+    sp_canvas_item_show(pc->c1);
+    sp_canvas_item_show(pc->cl1);
+
+    if ( pc->npoints == 2 ) {
+        pc->p[1] = p;
+        sp_canvas_item_hide(pc->c0);
+        sp_canvas_item_hide(pc->cl0);
+        SP_CTRL(pc->c1)->moveto(pc->p[1]);
+        pc->cl1->setCoords(pc->p[0], pc->p[1]);
+
+        spdc_pen_set_angle_distance_status_message(pc, p, 0, _("<b>Curve handle</b>: angle %3.2f&#176;, length %s; with <b>Ctrl</b> to snap angle"));
+    } else if ( pc->npoints == 5 ) {
+        pc->p[4] = p;
+        sp_canvas_item_show(pc->c0);
+        sp_canvas_item_show(pc->cl0);
+        bool is_symm = false;
+        if ( ( ( pc->mode == PenTool::MODE_CLICK ) && ( state & GDK_CONTROL_MASK ) ) ||
+             ( ( pc->mode == PenTool::MODE_DRAG ) &&  !( state & GDK_SHIFT_MASK  ) ) ) {
+            Geom::Point delta = p - pc->p[3];
+            pc->p[2] = pc->p[3] - delta;
+            is_symm = true;
+            pc->red_curve->reset();
+            pc->red_curve->moveto(pc->p[0]);
+            pc->red_curve->curveto(pc->p[1], pc->p[2], pc->p[3]);
+            sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->red_curve);
+        }
+        SP_CTRL(pc->c0)->moveto(pc->p[2]);
+        pc->cl0 ->setCoords(pc->p[3], pc->p[2]);
+        SP_CTRL(pc->c1)->moveto(pc->p[4]);
+        pc->cl1->setCoords(pc->p[3], pc->p[4]);
+
+        gchar *message = is_symm ?
+            _("<b>Curve handle, symmetric</b>: angle %3.2f&#176;, length %s; with <b>Ctrl</b> to snap angle, with <b>Shift</b> to move this handle only") :
+            _("<b>Curve handle</b>: angle %3.2f&#176;, length %s; with <b>Ctrl</b> to snap angle, with <b>Shift</b> to move this handle only");
+        spdc_pen_set_angle_distance_status_message(pc, p, 3, message);
+    } else {
+        g_warning("Something bad happened - npoints is %d", pc->npoints);
+    }
+}
+
+static void spdc_pen_finish_segment(PenTool *const pc, Geom::Point const p, guint const state)
+{
+    if (pc->polylines_paraxial) {
+        pen_last_paraxial_dir = pen_next_paraxial_direction(pc, p, pc->p[0], state);
+    }
+
+    ++pc->num_clicks;
+
+    if (!pc->red_curve->is_empty()) {
+        pc->green_curve->append_continuous(pc->red_curve, 0.0625);
+        SPCurve *curve = pc->red_curve->copy();
+        /// \todo fixme:
+        SPCanvasItem *cshape = sp_canvas_bpath_new(sp_desktop_sketch(pc->desktop), curve);
+        curve->unref();
+        sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cshape), pc->green_color, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
+
+        pc->green_bpaths = g_slist_prepend(pc->green_bpaths, cshape);
+
+        pc->p[0] = pc->p[3];
+        pc->p[1] = pc->p[4];
+        pc->npoints = 2;
+
+        pc->red_curve->reset();
+    }
+}
+
+static void spdc_pen_finish(PenTool *const pc, gboolean const closed)
+{
+    if (pc->expecting_clicks_for_LPE > 1) {
+        // don't let the path be finished before we have collected the required number of mouse clicks
+        return;
+    }
+
+    pc->num_clicks = 0;
+
+    pen_disable_events(pc);
+
+    SPDesktop *const desktop = pc->desktop;
+    pc->message_context->clear();
+    desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Drawing finished"));
+
+    pc->red_curve->reset();
+    spdc_concat_colors_and_flush(pc, closed);
+    pc->sa = NULL;
+    pc->ea = NULL;
+
+    pc->npoints = 0;
+    pc->state = PenTool::POINT;
+
+    sp_canvas_item_hide(pc->c0);
+    sp_canvas_item_hide(pc->c1);
+    sp_canvas_item_hide(pc->cl0);
+    sp_canvas_item_hide(pc->cl1);
+
+    if (pc->green_anchor) {
+        pc->green_anchor = sp_draw_anchor_destroy(pc->green_anchor);
+    }
+
+
+    pc->desktop->canvas->endForcedFullRedraws();
+
+    pen_enable_events(pc);
+}
+
+static void pen_disable_events(PenTool *const pc) {
+  pc->events_disabled++;
+}
+
+static void pen_enable_events(PenTool *const pc) {
+  g_return_if_fail(pc->events_disabled != 0);
+
+  pc->events_disabled--;
+}
+
+void sp_pen_context_wait_for_LPE_mouse_clicks(PenTool *pc, Inkscape::LivePathEffect::EffectType effect_type,
+                                         unsigned int num_clicks, bool use_polylines)
+{
+    if (effect_type == Inkscape::LivePathEffect::INVALID_LPE)
+        return;
+
+    pc->waiting_LPE_type = effect_type;
+    pc->expecting_clicks_for_LPE = num_clicks;
+    pc->polylines_only = use_polylines;
+    pc->polylines_paraxial = false; // TODO: think if this is correct for all cases
+}
+
+void sp_pen_context_cancel_waiting_for_LPE(PenTool *pc)
+{
+    pc->waiting_LPE_type = Inkscape::LivePathEffect::INVALID_LPE;
+    pc->expecting_clicks_for_LPE = 0;
+    sp_pen_context_set_polyline_mode(pc);
+}
+
+static int pen_next_paraxial_direction(const PenTool *const pc,
+                                       Geom::Point const &pt, Geom::Point const &origin, guint state) {
+    //
+    // after the first mouse click we determine whether the mouse pointer is closest to a
+    // horizontal or vertical segment; for all subsequent mouse clicks, we use the direction
+    // orthogonal to the last one; pressing Shift toggles the direction
+    //
+    // num_clicks is not reliable because spdc_pen_finish_segment is sometimes called too early
+    // (on first mouse release), in which case num_clicks immediately becomes 1.
+    // if (pc->num_clicks == 0) {
+
+    if (pc->green_curve->is_empty()) {
+        // first mouse click
+        double dist_h = fabs(pt[Geom::X] - origin[Geom::X]);
+        double dist_v = fabs(pt[Geom::Y] - origin[Geom::Y]);
+        int ret = (dist_h < dist_v) ? 1 : 0; // 0 = horizontal, 1 = vertical
+        pen_last_paraxial_dir = (state & GDK_SHIFT_MASK) ? 1 - ret : ret;
+        return pen_last_paraxial_dir;
+    } else {
+        // subsequent mouse click
+        return (state & GDK_SHIFT_MASK) ? pen_last_paraxial_dir : 1 - pen_last_paraxial_dir;
+    }
+}
+
+void pen_set_to_nearest_horiz_vert(const PenTool *const pc, Geom::Point &pt, guint const state, bool snap)
+{
+    Geom::Point const origin = pc->p[0];
+
+    int next_dir = pen_next_paraxial_direction(pc, pt, origin, state);
+
+    if (!snap) {
+        if (next_dir == 0) {
+            // line is forced to be horizontal
+            pt[Geom::Y] = origin[Geom::Y];
+        } else {
+            // line is forced to be vertical
+            pt[Geom::X] = origin[Geom::X];
+        }
+    } else {
+        // Create a horizontal or vertical constraint line
+        Inkscape::Snapper::SnapConstraint cl(origin, next_dir ? Geom::Point(0, 1) : Geom::Point(1, 0));
+
+        // Snap along the constraint line; if we didn't snap then still the constraint will be applied
+        SnapManager &m = pc->desktop->namedview->snap_manager;
+
+        Inkscape::Selection *selection = sp_desktop_selection (pc->desktop);
+        // selection->singleItem() is the item that is currently being drawn. This item will not be snapped to (to avoid self-snapping)
+        // TODO: Allow snapping to the stationary parts of the item, and only ignore the last segment
+
+        m.setup(pc->desktop, true, selection->singleItem());
+        m.constrainedSnapReturnByRef(pt, Inkscape::SNAPSOURCE_NODE_HANDLE, cl);
+        m.unSetup();
+    }
+}
+
+}
+}
+}
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :