1 files changed, 633 insertions, 0 deletions
diff --git a/src/ui/knot/knot-holder-entity.cpp b/src/ui/knot/knot-holder-entity.cpp
new file mode 100644
index 0000000..e75c628
--- /dev/null
+++ b/src/ui/knot/knot-holder-entity.cpp
@@ -0,0 +1,633 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * KnotHolderEntity definition.
+ *
+ * Authors:
+ *   Mitsuru Oka <oka326@parkcity.ne.jp>
+ *   Maximilian Albert <maximilian.albert@gmail.com>
+ *   Abhishek Sharma
+ *
+ * Copyright (C) 1999-2001 Lauris Kaplinski
+ * Copyright (C) 2000-2001 Ximian, Inc.
+ * Copyright (C) 2001 Mitsuru Oka
+ * Copyright (C) 2004 Monash University
+ * Copyright (C) 2008 Maximilian Albert
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include "knot-holder-entity.h"
+
+#include "desktop.h"
+#include "display/control/canvas-item-ctrl.h"
+#include "inkscape.h"
+#include "knot-holder.h"
+#include "live_effects/effect.h"
+#include "object/sp-hatch.h"
+#include "object/sp-item.h"
+#include "object/sp-marker.h"
+#include "object/sp-namedview.h"
+#include "object/sp-pattern.h"
+#include "object/filters/gaussian-blur.h"
+#include "preferences.h"
+#include "snap.h"
+#include "style.h"
+#include "object/sp-marker.h"
+
+#include "display/control/canvas-item-ctrl.h"
+#include <glibmm/i18n.h>
+
+void KnotHolderEntity::create(SPDesktop *desktop, SPItem *item, KnotHolder *parent,
+                              Inkscape::CanvasItemCtrlType type,
+                              Glib::ustring const & name,
+                              const gchar *tip, guint32 color)
+{
+    if (!desktop) {
+        desktop = parent->getDesktop();
+    }
+
+    g_assert(item == parent->getItem());
+    g_assert(desktop && desktop == parent->getDesktop());
+    g_assert(knot == nullptr);
+
+    parent_holder = parent;
+    this->item = item; // TODO: remove the item either from here or from knotholder.cpp
+    this->desktop = desktop;
+
+    my_counter = KnotHolderEntity::counter++;
+
+    knot = new SPKnot(desktop, tip, type, name);
+    knot->fill [SP_KNOT_STATE_NORMAL] = color;
+    knot->ctrl->set_fill(color);
+    on_created();
+    update_knot();
+    knot->show();
+
+    _mousedown_connection = knot->mousedown_signal.connect(sigc::mem_fun(*parent_holder, &KnotHolder::knot_mousedown_handler));
+    _moved_connection = knot->moved_signal.connect(sigc::mem_fun(*parent_holder, &KnotHolder::knot_moved_handler));
+    _click_connection = knot->click_signal.connect(sigc::mem_fun(*parent_holder, &KnotHolder::knot_clicked_handler));
+    _ungrabbed_connection = knot->ungrabbed_signal.connect(sigc::mem_fun(*parent_holder, &KnotHolder::knot_ungrabbed_handler));
+}
+                              
+KnotHolderEntity::~KnotHolderEntity()
+{
+    _mousedown_connection.disconnect();
+    _moved_connection.disconnect();
+    _click_connection.disconnect();
+    _ungrabbed_connection.disconnect();
+
+    /* unref should call destroy */
+    if (knot) {
+        //g_object_unref(knot);
+        knot_unref(knot);
+    } else {
+        // FIXME: This shouldn't occur. Perhaps it is caused by LPE PointParams being knotholder entities, too
+        //        If so, it will likely be fixed with upcoming refactoring efforts.
+        g_return_if_fail(knot);
+    }
+}
+
+void
+KnotHolderEntity::update_knot()
+{
+    Geom::Point knot_pos(knot_get());
+    if (knot_pos.isFinite()) {
+        Geom::Point dp(knot_pos * parent_holder->getEditTransform() * item->i2dt_affine());
+
+        _moved_connection.block();
+        knot->setPosition(dp, SP_KNOT_STATE_NORMAL);
+        _moved_connection.unblock();
+    } else {
+        // knot coords are non-finite, hide knot
+        knot->hide();
+    }
+}
+
+Geom::Point
+KnotHolderEntity::snap_knot_position(Geom::Point const &p, guint state)
+{
+    if (state & GDK_SHIFT_MASK) { // Don't snap when shift-key is held
+        return p;
+    }
+
+    Geom::Affine const i2dt (parent_holder->getEditTransform() * item->i2dt_affine());
+    Geom::Point s = p * i2dt;
+
+    if (!desktop) std::cerr << "No desktop" << std::endl;
+    if (!desktop->namedview) std::cerr << "No named view" << std::endl;
+    SnapManager &m = desktop->namedview->snap_manager;
+    m.setup(desktop, true, item);
+    m.freeSnapReturnByRef(s, Inkscape::SNAPSOURCE_NODE_HANDLE);
+    m.unSetup();
+
+    return s * i2dt.inverse();
+}
+
+Geom::Point
+KnotHolderEntity::snap_knot_position_constrained(Geom::Point const &p, Inkscape::Snapper::SnapConstraint const &constraint, guint state)
+{
+    if (state & GDK_SHIFT_MASK) { // Don't snap when shift-key is held
+        return p;
+    }
+
+    Geom::Affine const i2d (parent_holder->getEditTransform() * item->i2dt_affine());
+    Geom::Point s = p * i2d;
+
+    SnapManager &m = desktop->namedview->snap_manager;
+    m.setup(desktop, true, item);
+
+    // constrainedSnap() will first project the point p onto the constraint line and then try to snap along that line.
+    // This way the constraint is already enforced, no need to worry about that later on
+    Inkscape::Snapper::SnapConstraint transformed_constraint = Inkscape::Snapper::SnapConstraint(constraint.getPoint() * i2d, (constraint.getPoint() + constraint.getDirection()) * i2d - constraint.getPoint() * i2d);
+    m.constrainedSnapReturnByRef(s, Inkscape::SNAPSOURCE_NODE_HANDLE, transformed_constraint);
+    m.unSetup();
+
+    return s * i2d.inverse();
+}
+
+void
+LPEKnotHolderEntity::knot_ungrabbed(Geom::Point const &p, Geom::Point const &origin, guint state)
+{
+    if (_effect) {
+        _effect->refresh_widgets = true;
+        _effect->makeUndoDone(_("Move handle"));
+    }
+}
+
+/* Pattern manipulation */
+
+void PatternKnotHolderEntity::on_created()
+{
+    // Setup an initial pattern transformation in the center
+    if (auto rect = item->documentGeometricBounds()) {
+        _cell = offset_to_cell(rect->midpoint());
+    }
+}
+
+/**
+ * Returns the position based on the pattern's origin, shifted by the percent x/y of it's size.
+ */
+Geom::Point PatternKnotHolderEntity::_get_pos(gdouble x, gdouble y, bool transform) const
+{
+    auto pat = _pattern();
+    auto pt = Geom::Point((_cell[Geom::X] + x) * pat->width(),
+                          (_cell[Geom::Y] + y) * pat->height());
+    return transform ? pt * pat->getTransform() : pt;
+}
+
+bool PatternKnotHolderEntity::set_item_clickpos(Geom::Point loc)
+{
+    _cell = offset_to_cell(loc);
+    update_knot();
+    return true;
+}
+
+void PatternKnotHolderEntity::update_knot() {
+    KnotHolderEntity::update_knot();
+}
+
+Geom::IntPoint PatternKnotHolderEntity::offset_to_cell(Geom::Point loc) const {
+    auto pat = _pattern();
+
+    // 1. Turn the location into the pattern grid coordinate
+    auto scale = Geom::Scale(pat->width(), pat->height());
+    auto d2i = item->i2doc_affine().inverse();
+    auto i2p = pat->getTransform().inverse();
+
+    // Get grid index of nearest pattern repetition.
+    return (loc * d2i * i2p * scale.inverse()).floor();
+}
+
+
+SPPattern *PatternKnotHolderEntity::_pattern() const
+{
+    return _fill ? cast<SPPattern>(item->style->getFillPaintServer()) : cast<SPPattern>(item->style->getStrokePaintServer());
+}
+
+bool PatternKnotHolderEntity::knot_missing() const
+{
+    return !_pattern();
+}
+
+/* Pattern X/Y knot */
+
+void PatternKnotHolderEntityXY::on_created()
+{
+    PatternKnotHolderEntity::on_created();
+    // TODO: Move to constructor when desktop is generally available
+    _quad = make_canvasitem<Inkscape::CanvasItemQuad>(desktop->getCanvasControls());
+    _quad->lower_to_bottom();
+    _quad->set_fill(0x00000000);
+    _quad->set_stroke(0x808080ff);
+    _quad->set_inverted(true);
+    _quad->hide();
+}
+
+void PatternKnotHolderEntityXY::update_knot()
+{
+    PatternKnotHolderEntity::update_knot();
+    auto tr = item->i2dt_affine();
+    _quad->set_coords(_get_pos(0, 0) * tr, _get_pos(0, 1) * tr,
+                      _get_pos(1, 1) * tr, _get_pos(1, 0) * tr);
+    _quad->show();
+}
+
+Geom::Point PatternKnotHolderEntityXY::knot_get() const
+{
+    return _get_pos(0, 0);
+}
+
+void
+PatternKnotHolderEntityXY::knot_set(Geom::Point const &p, Geom::Point const &origin, guint state)
+{
+    // FIXME: this snapping should be done together with knowing whether control was pressed. If GDK_CONTROL_MASK, then constrained snapping should be used.
+    Geom::Point p_snapped = snap_knot_position(p, state);
+
+    if ( state & GDK_CONTROL_MASK ) {
+        if (fabs((p - origin)[Geom::X]) > fabs((p - origin)[Geom::Y])) {
+            p_snapped[Geom::Y] = origin[Geom::Y];
+        } else {
+            p_snapped[Geom::X] = origin[Geom::X];
+        }
+    }
+
+    if (state)  {
+        Geom::Point const q = p_snapped - knot_get();
+        item->adjust_pattern(Geom::Translate(q), false, _fill ? TRANSFORM_FILL : TRANSFORM_STROKE);
+    }
+
+    item->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
+}
+
+/* Pattern Angle knot */
+
+Geom::Point PatternKnotHolderEntityAngle::knot_get() const
+{
+    return _get_pos(1.0, 0);
+}
+
+void
+PatternKnotHolderEntityAngle::knot_set(Geom::Point const &p, Geom::Point const &/*origin*/, guint state)
+{
+    Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+    int const snaps = prefs->getInt("/options/rotationsnapsperpi/value", 12);
+
+    // get the angle from pattern 0,0 to the cursor pos
+    Geom::Point transform_origin = _get_pos(0, 0);
+    gdouble theta = atan2(p - transform_origin);
+    gdouble theta_old = atan2(knot_get() - transform_origin);
+
+    if ( state & GDK_CONTROL_MASK ) {
+        /* Snap theta */
+        double snaps_radian = M_PI/snaps;
+        theta = std::round(theta/snaps_radian) * snaps_radian;
+    }
+
+    Geom::Affine rot = Geom::Translate(-transform_origin)
+                     * Geom::Rotate(theta - theta_old)
+                     * Geom::Translate(transform_origin);
+    item->adjust_pattern(rot, false, _fill ? TRANSFORM_FILL : TRANSFORM_STROKE);
+    item->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
+}
+
+/* Pattern scale knot */
+
+Geom::Point PatternKnotHolderEntityScale::knot_get() const
+{
+    return _get_pos(1.0, 1.0);
+}
+
+/** Store pattern geometry info when the scale knot is first grabbed. */
+void PatternKnotHolderEntityScale::knot_grabbed(Geom::Point const &grab_pos, unsigned)
+{
+    _cached_transform = _pattern()->getTransform();
+    _cached_origin = _get_pos(0, 0);
+    _cached_inverse_linear = _cached_transform.withoutTranslation().inverse();
+    _cached_diagonal = (grab_pos - _cached_origin) * _cached_inverse_linear;
+
+    if (auto bounding_box = item->documentVisualBounds()) {
+        // Compare the areas of the pattern and the item to find the number of repetitions.
+        double const pattern_area = std::abs(_cached_diagonal[Geom::X] * _cached_diagonal[Geom::Y]);
+        double const item_area = bounding_box->area() * _cached_inverse_linear.descrim2() /
+                                 (item->i2doc_affine().descrim2() ?: 1e-3);
+        _cached_min_scale = std::sqrt(item_area / (pattern_area * MAX_REPETITIONS));
+    } else {
+        _cached_min_scale = 1e-6;
+    }
+}
+
+void
+PatternKnotHolderEntityScale::knot_set(Geom::Point const &p, Geom::Point const &, guint state)
+{
+    using namespace Geom;
+    // FIXME: this snapping should be done together with knowing whether control was pressed.
+    // If GDK_CONTROL_MASK, then constrained snapping should be used.
+    Point p_snapped = snap_knot_position(p, state);
+
+    Point const new_extent = (p_snapped - _cached_origin) * _cached_inverse_linear;
+
+    // 1. Calculate absolute scale factor first
+    double scale_x = std::clamp(new_extent[X] / _cached_diagonal[X], _cached_min_scale, 1e9);
+    double scale_y = std::clamp(new_extent[Y] / _cached_diagonal[Y], _cached_min_scale, 1e9);
+
+    Affine new_transform = (state & GDK_CONTROL_MASK) ? Scale(lerp(0.5, scale_x, scale_y))
+                                                      : Scale(scale_x, scale_y);
+
+    // 2. Calculate offset to keep pattern origin aligned
+    new_transform *= _cached_transform;
+    auto const new_uncompensated_origin = _get_pos(0, 0, false) * new_transform;
+    new_transform *= Translate(_cached_origin - new_uncompensated_origin);
+
+    item->adjust_pattern(new_transform, true, _fill ? TRANSFORM_FILL : TRANSFORM_STROKE);
+    item->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
+}
+
+/* Hatch manipulation */
+bool HatchKnotHolderEntity::knot_missing() const
+{
+    SPHatch *hatch = _hatch();
+    return (hatch == nullptr);
+}
+
+SPHatch *HatchKnotHolderEntity::_hatch() const
+{
+    return _fill ? cast<SPHatch>(item->style->getFillPaintServer()) : cast<SPHatch>(item->style->getStrokePaintServer());
+}
+
+static Geom::Point sp_hatch_knot_get(SPHatch const *hatch, gdouble x, gdouble y)
+{
+    return Geom::Point(x, y) * hatch->hatchTransform();
+}
+
+Geom::Point HatchKnotHolderEntityXY::knot_get() const
+{
+    SPHatch *hatch = _hatch();
+    return sp_hatch_knot_get(hatch, 0, 0);
+}
+
+Geom::Point HatchKnotHolderEntityAngle::knot_get() const
+{
+    SPHatch *hatch = _hatch();
+    return sp_hatch_knot_get(hatch, hatch->pitch(), 0);
+}
+
+Geom::Point HatchKnotHolderEntityScale::knot_get() const
+{
+    SPHatch *hatch = _hatch();
+    return sp_hatch_knot_get(hatch, hatch->pitch(), hatch->pitch());
+}
+
+void HatchKnotHolderEntityXY::knot_set(Geom::Point const &p, Geom::Point const &origin, unsigned int state)
+{
+    Geom::Point p_snapped = snap_knot_position(p, state);
+
+    if (state & GDK_CONTROL_MASK) {
+        if (fabs((p - origin)[Geom::X]) > fabs((p - origin)[Geom::Y])) {
+            p_snapped[Geom::Y] = origin[Geom::Y];
+        } else {
+            p_snapped[Geom::X] = origin[Geom::X];
+        }
+    }
+
+    if (state) {
+        Geom::Point const q = p_snapped - knot_get();
+        item->adjust_hatch(Geom::Translate(q), false, _fill ? TRANSFORM_FILL : TRANSFORM_STROKE);
+    }
+
+    item->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
+}
+
+void HatchKnotHolderEntityAngle::knot_set(Geom::Point const &p, Geom::Point const &origin, unsigned int state)
+{
+    Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+    int const snaps = prefs->getInt("/options/rotationsnapsperpi/value", 12);
+
+    SPHatch *hatch = _hatch();
+
+    // get the angle from hatch 0,0 to the cursor pos
+    Geom::Point transform_origin = sp_hatch_knot_get(hatch, 0, 0);
+    gdouble theta = atan2(p - transform_origin);
+    gdouble theta_old = atan2(knot_get() - transform_origin);
+
+    if (state & GDK_CONTROL_MASK) {
+        /* Snap theta */
+        double snaps_radian = M_PI/snaps;
+        theta = std::round(theta/snaps_radian) * snaps_radian;
+    }
+
+    Geom::Affine rot =
+        Geom::Translate(-transform_origin) * Geom::Rotate(theta - theta_old) * Geom::Translate(transform_origin);
+    item->adjust_hatch(rot, false, _fill ? TRANSFORM_FILL : TRANSFORM_STROKE);
+    item->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
+}
+
+void HatchKnotHolderEntityScale::knot_set(Geom::Point const &p, Geom::Point const &origin, unsigned int state)
+{
+    SPHatch *hatch = _hatch();
+
+    // FIXME: this snapping should be done together with knowing whether control was pressed.
+    // If GDK_CONTROL_MASK, then constrained snapping should be used.
+    Geom::Point p_snapped = snap_knot_position(p, state);
+
+    // Get the new scale from the position of the knotholder
+    Geom::Affine transform = hatch->hatchTransform();
+    Geom::Affine transform_inverse = transform.inverse();
+    Geom::Point d = p_snapped * transform_inverse;
+    Geom::Point d_origin = origin * transform_inverse;
+    Geom::Point origin_dt;
+    gdouble hatch_pitch = hatch->pitch();
+    if (state & GDK_CONTROL_MASK) {
+        // if ctrl is pressed: use 1:1 scaling
+        d = d_origin * (d.length() / d_origin.length());
+    }
+
+    Geom::Affine scale = Geom::Translate(-origin_dt) * Geom::Scale(d.x() / hatch_pitch, d.y() / hatch_pitch) *
+                         Geom::Translate(origin_dt) * transform;
+
+    item->adjust_hatch(scale, true, _fill ? TRANSFORM_FILL : TRANSFORM_STROKE);
+    item->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
+}
+
+/* Filter visible size manipulation */
+void FilterKnotHolderEntity::knot_set(Geom::Point const &p, Geom::Point const &origin, unsigned int state)
+{
+    // FIXME: this snapping should be done together with knowing whether control was pressed. If GDK_CONTROL_MASK, then constrained snapping should be used.
+    Geom::Point p_snapped = snap_knot_position(p, state);
+
+    if ( state & GDK_CONTROL_MASK ) {
+        if (fabs((p - origin)[Geom::X]) > fabs((p - origin)[Geom::Y])) {
+            p_snapped[Geom::Y] = origin[Geom::Y];
+        } else {
+            p_snapped[Geom::X] = origin[Geom::X];
+        }
+    }
+
+    if (state)  {
+        SPFilter *filter = (item->style) ? item->style->getFilter() : nullptr;
+        if(!filter) return;
+        Geom::OptRect orig_bbox = item->visualBounds();
+        std::unique_ptr<Geom::Rect> new_bbox(_topleft ? new Geom::Rect(p,orig_bbox->max()) : new Geom::Rect(orig_bbox->min(), p));
+
+        if (!filter->width._set) {
+            filter->width.set(SVGLength::PERCENT, 1.2);
+        }
+        if (!filter->height._set) {
+            filter->height.set(SVGLength::PERCENT, 1.2);
+        }
+        if (!filter->x._set) {
+            filter->x.set(SVGLength::PERCENT, -0.1);
+        }
+        if (!filter->y._set) {
+            filter->y.set(SVGLength::PERCENT, -0.1);
+        }
+
+        if(_topleft) {
+            float x_a = filter->width.computed;
+            float y_a = filter->height.computed;
+            filter->height.scale(new_bbox->height()/orig_bbox->height());
+            filter->width.scale(new_bbox->width()/orig_bbox->width());
+            float x_b = filter->width.computed;
+            float y_b = filter->height.computed;
+            filter->x.set(filter->x.unit, filter->x.computed + x_a - x_b);
+            filter->y.set(filter->y.unit, filter->y.computed + y_a - y_b);
+        } else {
+            filter->height.scale(new_bbox->height()/orig_bbox->height());
+            filter->width.scale(new_bbox->width()/orig_bbox->width());
+        }
+        filter->auto_region = false;
+        filter->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
+
+    }
+
+    item->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
+}
+
+Geom::Point FilterKnotHolderEntity::knot_get() const
+{
+    SPFilter *filter = (item->style) ? item->style->getFilter() : nullptr;
+    if(!filter) return Geom::Point(Geom::infinity(), Geom::infinity());
+    Geom::OptRect r = item->visualBounds();
+    if (_topleft) return Geom::Point(r->min());
+    else return Geom::Point(r->max());
+}
+
+/* Blur manipulation */
+
+void BlurKnotHolderEntity::on_created()
+{
+    KnotHolderEntity::on_created();
+    // TODO: Move to constructor when desktop is generally available
+
+    _line = make_canvasitem<Inkscape::CanvasItemCurve>(desktop->getCanvasControls());
+    _line->set_z_position(0);
+    _line->set_stroke(0x0033cccc);
+    _line->hide();
+
+    // This watcher makes sure that adding or removing a blur results in updated knots.
+    _watch_filter = item->style->signal_filter_changed.connect([=] (auto old_obj, auto obj) {
+        update_knot();
+    }); 
+}
+
+void BlurKnotHolderEntity::update_knot()
+{
+    auto blur = _blur();
+    if (blur) {
+        knot->show();
+        // This watcher makes sure anything outside that modifies the blur changes the knot.
+        _watch_blur = blur->connectModified([=](auto item, int flags) {
+            KnotHolderEntity::update_knot();
+        });
+
+    } else {
+        knot->hide();
+        _watch_blur.disconnect();
+        _line->hide();
+    }
+    KnotHolderEntity::update_knot();
+}
+
+
+
+/* Return the first blur primitive of any applied filter. */
+SPGaussianBlur *BlurKnotHolderEntity::_blur() const
+{
+    if (auto filter = item->style->getFilter()) {
+        for (auto &primitive : filter->children) {
+            if (auto blur = cast<SPGaussianBlur>(&primitive)) {
+                return blur;
+            }
+        }
+    }
+    return nullptr;
+}
+
+Geom::Point BlurKnotHolderEntity::_pos() const
+{
+    auto box = item->bbox(Geom::identity(), SPItem::VISUAL_BBOX);
+    if (_dir == Geom::Y) {
+        return Geom::Point(box->midpoint()[Geom::X], box->top());
+    }
+    return Geom::Point(box->right(), box->midpoint()[Geom::Y]);
+}
+
+Geom::Point BlurKnotHolderEntity::knot_get() const
+{
+    auto blur = _blur();
+    if (!blur)
+        return Geom::Point(0, 0);
+
+    // First let's find where the gradient is
+    auto tr = item->i2dt_affine();
+    auto dev = blur->get_std_deviation();
+
+    // Blur visibility is 2.4 times the deviation in that direction.
+    double x = dev.getNumber();
+    double y = dev.getOptNumber(true);
+
+    auto p0 = _pos();
+    auto p1 = p0 + Geom::Point(x * 2.4, 0);
+    if (_dir == Geom::Y) {
+        p1 = p0 - Geom::Point(0, y * 2.4);
+    }
+    _line->show();
+    _line->set_coords(p0 * tr, p1 * tr);
+
+    return p1;
+}
+void BlurKnotHolderEntity::knot_set(Geom::Point const &p, Geom::Point const &origin, guint state)
+{
+    auto blur = _blur();
+    if (!blur)
+        return;
+
+    NumberOptNumber dev = blur->get_std_deviation();
+    auto dp = Geom::Point(dev.getNumber(), dev.getOptNumber(true));
+    auto val = std::max(0.0, (((p - _pos()) * Geom::Scale(1, -1))[_dir]) / 2.4);
+
+    if (state & GDK_CONTROL_MASK) {
+        if (state & GDK_SHIFT_MASK) {
+            dp[!_dir] *= (val / dp[_dir]);
+        } else {
+            dp[!_dir] = val;
+        }
+    }
+    dp[_dir] = val;
+
+    // When X is set to zero the Opt blur disapears
+    dev.setNumber(std::max(0.001, dp[Geom::X]));
+    dev.setOptNumber(std::max(0.0, dp[Geom::Y]));
+
+    blur->set_deviation(dev);
+}
+
+/*
+  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 :