diff --git a/plugins/tools/selectiontools/KisMagneticGraph.h b/plugins/tools/selectiontools/KisMagneticGraph.h
index aef6f6936b..e470172c7f 100644
--- a/plugins/tools/selectiontools/KisMagneticGraph.h
+++ b/plugins/tools/selectiontools/KisMagneticGraph.h
@@ -1,255 +1,257 @@
 /*
  *  Copyright (c) 2019 Kuntal Majumder <hellozee@disroot.org>
  *
  *  This library is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU Lesser General Public License as published by
  *  the Free Software Foundation; version 2.1 of the License.
  *
  *  This library 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 Lesser General Public License for more details.
  *
  *  You should have received a copy of the GNU Lesser General Public License
  *  along with this program; if not, write to the Free Software
  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  */
 
 #ifndef KISMAGNETICGRAPH_H
 #define KISMAGNETICGRAPH_H
 
 #include <boost/operators.hpp>
 #include <boost/graph/graph_traits.hpp>
 #include <kis_paint_device.h>
 #include <kis_random_accessor_ng.h>
 
 #include <QDebug>
 #include <QRect>
 #include <QColor>
 
 struct VertexDescriptor {
 
     long x,y;
 
     enum Direction {
         MIN = 0,
         N = MIN, S, E, W, NW, NE, SW, SE, NONE
     };
 
     VertexDescriptor(long _x, long _y):
         x(_x), y(_y)
     { }
 
     VertexDescriptor(QPoint pt):
         x(pt.x()), y(pt.y())
     { }
 
     VertexDescriptor():
         x(0), y(0)
     { }
 
     bool operator==(VertexDescriptor const &rhs) const {
         return rhs.x == x && rhs.y == y;
     }
 
     bool operator==(QPoint const &rhs) const {
         return rhs.x() == x && rhs.y() == y;
     }
 
     bool operator !=(VertexDescriptor const &rhs) const {
         return rhs.x != x || rhs.y != y;
     }
 
     bool operator<(VertexDescriptor const &rhs) const {
         return x < rhs.x || (x == rhs.x && y < rhs.y);
     }
 
     // returns one of the 8 neighboring pixel based on the direction
     // it gives out multiple warnings, but I am lazy, sorry
     VertexDescriptor neighbor(Direction direction) const {
 
         int dx = 0, dy = 0;
 
         switch (direction){
         case W:
         case SW:
         case NW:
             dx = -1;
             break;
         case E:
         case SE:
         case NE:
             dx = 1;
         }
 
         switch(direction){
         case N:
         case NW:
         case NE:
             dy = -1;
             break;
         case S:
         case SW:
         case SE:
             dy = 1;
         }
 
         VertexDescriptor const neighbor(x + dx, y + dy);
         return neighbor;
     }
 };
 
 QDebug operator<<(QDebug dbg, const VertexDescriptor &v) {
     dbg.nospace() << "(" << v.x << ", " << v.y << ")";
     return dbg.space();
 }
 
 struct neighbour_iterator;
 
 struct KisMagneticGraph{
 
     typedef KisMagneticGraph type;
 
     KisMagneticGraph() { }
     KisMagneticGraph(KisPaintDeviceSP dev, QRect graphRect):
         m_rect(graphRect), m_dev(dev)
-    { }
+    {
+        m_randAccess = m_dev->createRandomAccessorNG(m_dev->exactBounds().x(), m_dev->exactBounds().y());
+    }
 
     typedef VertexDescriptor                                vertex_descriptor;
     typedef std::pair<vertex_descriptor, vertex_descriptor> edge_descriptor;
     typedef boost::undirected_tag                           directed_category;
     typedef boost::disallow_parallel_edge_tag               edge_parallel_category;
     typedef boost::incidence_graph_tag                      traversal_category;
     typedef neighbour_iterator                              out_edge_iterator;
     typedef unsigned                                        degree_size_type;
 
 
-    double getIntensity(VertexDescriptor pt){
-        KisRandomAccessorSP randAccess = m_dev->createRandomAccessorNG(m_dev->exactBounds().x(),m_dev->exactBounds().y());
-        randAccess->moveTo(pt.x, pt.y);
-        qint8 val = *(randAccess->rawData());
+    double getIntensity(VertexDescriptor pt) {
+        m_randAccess->moveTo(pt.x, pt.y);
+        qint8 val = *(m_randAccess->rawData());
         //offsetting the value, so we don't get negatives
         return val + 255;
     }
 
     unsigned outDegree(VertexDescriptor pt){
         //corners
         if(pt == m_rect.topLeft() || pt == m_rect.topRight() ||
                 pt == m_rect.bottomLeft() || pt == m_rect.bottomRight()){
             if(m_rect.width() == 1 || m_rect.height() == 1)
                 return 1;
             return 3;
         }
 
         //edges
         if(pt.x == m_rect.topLeft().x() || pt.y == m_rect.topLeft().y()  ||
                 pt.x == m_rect.bottomRight().x() || pt.y == m_rect.bottomRight().y()){
             if(m_rect.width() == 1 || m_rect.height() == 1)
                 return 2;
             return 5;
         }
         return 8;
     }
 
     QRect m_rect;
 
 private:
     KisPaintDeviceSP m_dev;
+    KisRandomAccessorSP m_randAccess;
 };
 
 struct neighbour_iterator : public boost::iterator_facade<neighbour_iterator,
                                std::pair<VertexDescriptor, VertexDescriptor>,
                                                 boost::forward_traversal_tag,
                                std::pair<VertexDescriptor, VertexDescriptor>>
 {
 
     neighbour_iterator(VertexDescriptor v, KisMagneticGraph g, VertexDescriptor::Direction d):
         m_point(v), m_direction(d), m_graph(g)
     { }
 
     neighbour_iterator()
     { }
 
     std::pair<VertexDescriptor, VertexDescriptor>
     operator*() const {
         std::pair<VertexDescriptor, VertexDescriptor> const result = std::make_pair(m_point, m_point.neighbor(m_direction));
         return result;
     }
 
     void operator++() {
         m_direction = static_cast<VertexDescriptor::Direction>(int(m_direction)+1);
         VertexDescriptor next = m_point.neighbor(m_direction);
         if(m_direction == VertexDescriptor::NONE){
             return;
         }
         if(!m_graph.m_rect.contains(next.x, next.y)){
             operator++();
         }
     }
 
     bool operator==(neighbour_iterator const& that) const {
         return m_point == that.m_point && m_direction == that.m_direction;
     }
 
     bool equal(neighbour_iterator const& that) const {
         return operator==(that);
     }
 
     void increment() {
         operator++();
     }
 
 private:
     VertexDescriptor m_point;
     VertexDescriptor::Direction m_direction;
     KisMagneticGraph m_graph;
 };
 
 // Requirements for an Incidence Graph,
 // https://www.boost.org/doc/libs/1_70_0/libs/graph/doc/IncidenceGraph.html
 
 namespace boost{
 template<>
 struct graph_traits<KisMagneticGraph> {
     typedef typename KisMagneticGraph::vertex_descriptor      vertex_descriptor;
     typedef typename KisMagneticGraph::edge_descriptor        edge_descriptor;
     typedef typename KisMagneticGraph::out_edge_iterator      out_edge_iterator;
     typedef typename KisMagneticGraph::directed_category      directed_category;
     typedef typename KisMagneticGraph::edge_parallel_category edge_parallel_category;
     typedef typename KisMagneticGraph::traversal_category     traversal_category;
     typedef typename KisMagneticGraph::degree_size_type       degree_size_type;
 
     typedef void in_edge_iterator;
     typedef void vertex_iterator;
     typedef void vertices_size_type;
     typedef void edge_iterator;
     typedef void edges_size_type;
 };
 }
 
 typename KisMagneticGraph::vertex_descriptor
 source(typename KisMagneticGraph::edge_descriptor e, KisMagneticGraph g) {
     Q_UNUSED(g)
     return e.first;
 }
 
 typename KisMagneticGraph::vertex_descriptor
 target(typename KisMagneticGraph::edge_descriptor e, KisMagneticGraph g) {
     Q_UNUSED(g)
     return e.second;
 }
 
 std::pair<KisMagneticGraph::out_edge_iterator, KisMagneticGraph::out_edge_iterator>
 out_edges(typename KisMagneticGraph::vertex_descriptor v, KisMagneticGraph g) {
     return std::make_pair(
                 KisMagneticGraph::out_edge_iterator(v, g, VertexDescriptor::Direction::MIN),
                 KisMagneticGraph::out_edge_iterator(v, g, VertexDescriptor::Direction::NONE)
                 );
 }
 
 typename KisMagneticGraph::degree_size_type
 out_degree(typename KisMagneticGraph::vertex_descriptor v, KisMagneticGraph g) {
     return g.outDegree(v);
 }
 
 #endif
diff --git a/plugins/tools/selectiontools/KisMagneticWorker.cc b/plugins/tools/selectiontools/KisMagneticWorker.cc
index 24e122a942..5f36af5b8c 100644
--- a/plugins/tools/selectiontools/KisMagneticWorker.cc
+++ b/plugins/tools/selectiontools/KisMagneticWorker.cc
@@ -1,229 +1,231 @@
 /*
  *  Copyright (c) 2019 Kuntal Majumder <hellozee@disroot.org>
  *
  *  This library is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU Lesser General Public License as published by
  *  the Free Software Foundation; version 2.1 of the License.
  *
  *  This library 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 Lesser General Public License for more details.
  *
  *  You should have received a copy of the GNU Lesser General Public License
  *  along with this program; if not, write to the Free Software
  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  */
 
 #include "KisMagneticWorker.h"
 
 #include <kis_gaussian_kernel.h>
 #include <lazybrush/kis_lazy_fill_tools.h>
 
 #include <QtCore>
 #include <QPolygon>
 
 #include <boost/graph/astar_search.hpp>
 
 #include "KisMagneticGraph.h"
 
 struct DistanceMap {
     typedef VertexDescriptor key_type;
     typedef double data_type;
     typedef std::pair<key_type, data_type> value_type;
 
     DistanceMap(double const& dval)
             : m_default(dval)
     { }
 
     data_type &operator[](key_type const& k) {
         if (m.find(k) == m.end())
             m[k] = m_default;
         return m[k];
     }
 
 private:
     std::map<key_type, data_type> m;
     data_type const m_default;
 };
 
 struct PredecessorMap{
     PredecessorMap()
     { }
 
     PredecessorMap(PredecessorMap const& that):
     m_map(that.m_map)
     { }
 
     typedef VertexDescriptor key_type;
     typedef VertexDescriptor value_type;
     typedef VertexDescriptor & reference_type;
     typedef boost::read_write_property_map_tag category;
 
     VertexDescriptor &operator[](VertexDescriptor v){
         return m_map[v];
     }
 
     std::map<VertexDescriptor, VertexDescriptor> m_map;
 };
 
 VertexDescriptor get(PredecessorMap const &m, VertexDescriptor v){
     typename std::map<VertexDescriptor, VertexDescriptor>::const_iterator found = m.m_map.find(v);
     return found != m.m_map.end() ? found->second : v;
 }
 
 void put(PredecessorMap &m, VertexDescriptor key, VertexDescriptor value){
     m.m_map[key] = value;
 }
 
 double EuclideanDistance(VertexDescriptor p1, VertexDescriptor p2){
     return std::sqrt(std::pow(p1.y-p2.y, 2) + std::pow(p1.x-p2.x, 2));
 }
 
 class AStarHeuristic : public boost::astar_heuristic<KisMagneticGraph, double> {
     private:
         VertexDescriptor m_goal;
         double coeff_a, coeff_b;
 
     public:
         AStarHeuristic(VertexDescriptor goal, double a, double b):
             m_goal(goal), coeff_a(a), coeff_b(b)
         { }
 
         AStarHeuristic(VertexDescriptor goal):
             m_goal(goal), coeff_a(0.5), coeff_b(0.5)
         { }
 
         double operator()(VertexDescriptor v){
             return EuclideanDistance(v,m_goal);
         }
 };
 
 struct GoalFound {};
 
 class AStarGoalVisitor : public boost::default_astar_visitor {
     public:
         AStarGoalVisitor(VertexDescriptor goal) : m_goal(goal) { }
 
         void examine_vertex(VertexDescriptor u, KisMagneticGraph const &g) {
             Q_UNUSED(g)
             if(u == m_goal){
                 throw GoalFound();
             }
         }
 
     private:
         VertexDescriptor m_goal;
 };
 
 struct WeightMap{
     typedef std::pair<VertexDescriptor, VertexDescriptor> key_type;
     typedef double data_type;
     typedef std::pair<key_type, data_type> value_type;
 
     WeightMap() { }
 
     WeightMap(KisMagneticGraph g):
         m_graph(g)
     { }
 
     data_type& operator[](key_type const& k) {
         if (m_map.find(k) == m_map.end()) {
             double edge_gradient = (m_graph.getIntensity(k.first) + m_graph.getIntensity(k.second))/2;
             m_map[k] = EuclideanDistance(k.first, k.second) * (edge_gradient + 1);
         }
         return m_map[k];
     }
 
 private:
     std::map<key_type, data_type> m_map;
     KisMagneticGraph m_graph;
 };
 
+KisMagneticWorker::KisMagneticWorker(KisPaintDeviceSP dev) :
+    m_dev(dev)
+{
+    KisGaussianKernel::applyLoG(m_dev, m_dev->exactBounds(), 2, 1.0, QBitArray(), 0);
+    KisLazyFillTools::normalizeAndInvertAlpha8Device(m_dev, m_dev->exactBounds());
+}
+
 QRect KisMagneticWorker::calculateRect(QPoint p1, QPoint p2, int radius) const {
 
     // I am sure there is a simpler version of it which exists but well
     // Calculates a bounding rectangle based on the radius,
     // --------------------------------
     // |    -------------------       |
     // |    | A*              |       |
     // |    |                 |       |
     // |    |               *B|       |
     // |    -------------------       |
     // --------------------------------
 
     double slope = (p2.y() - p1.y())/(p2.x() - p1.x());
     QPoint a,b,c,d;
     if(slope != 0){
         slope = -1/slope;
         double denom = 2 * std::sqrt(slope*slope+1);
         double numer = radius/denom;
         double fac1 = numer/denom;
         denom = 2 * denom;
         numer = 3 * slope * numer;
         double fac2 = numer/denom;
         a = QPoint(p1.x() - fac1, p1.y() - fac2);
         b = QPoint(p1.x() + fac1, p1.y() + fac2);
         c = QPoint(p2.x() - fac1, p2.y() - fac2);
         d = QPoint(p2.x() + fac1, p2.y() + fac2);
     }else{
         double fac = radius/2;
         a = QPoint(p1.x() - fac, p1.y() - fac);
         b = QPoint(p1.x() + fac, p1.y() + fac);
         c = QPoint(p2.x() - fac, p2.y() - fac);
         d = QPoint(p2.x() + fac, p2.y() + fac);
     }
 
     QPolygon p(QVector<QPoint>{a,b,c,d});
     return p.boundingRect();
 }
 
-QVector<QPointF> KisMagneticWorker::computeEdge(KisPaintDeviceSP dev, int radius, QPoint begin, QPoint end) {
+QVector<QPointF> KisMagneticWorker::computeEdge(int radius, QPoint begin, QPoint end) {
 
     //QRect rect = calculateRect(begin, end, radius);
-    QRect rect = QPolygon(QVector<QPoint>{begin, end}).boundingRect();
-    rect.setSize(rect.size()*10);
-    KisGaussianKernel::applyLoG(dev, rect, 2, 1.0, QBitArray(), 0);
-    KisLazyFillTools::normalizeAndInvertAlpha8Device(dev, rect);
 
     VertexDescriptor goal(end);
     VertexDescriptor start(begin);
-
-    KisMagneticGraph g(dev, rect);
+    KisMagneticGraph g(m_dev, m_dev->exactBounds());
 
     // How many maps does it require?
     // Take a look here, if it doesn't make sense, https://www.boost.org/doc/libs/1_70_0/libs/graph/doc/astar_search.html
     PredecessorMap pmap;
     DistanceMap dmap(std::numeric_limits<double>::max());
     dmap[start] = 0;
     std::map<VertexDescriptor, double> rmap;
     std::map<VertexDescriptor, boost::default_color_type> cmap;
     std::map<VertexDescriptor, double> imap;
     WeightMap wmap(g);
     AStarHeuristic heuristic(goal);
     QVector<QPointF> result;
 
     try{
         boost::astar_search_no_init(
                     g, start, heuristic
                     ,boost::visitor(AStarGoalVisitor(goal))
                     .distance_map(boost::associative_property_map<DistanceMap>(dmap))
                     .predecessor_map(boost::ref(pmap))
                     .weight_map(boost::associative_property_map<WeightMap>(wmap))
                     .vertex_index_map(boost::associative_property_map<std::map<VertexDescriptor, double>>(imap))
                     .rank_map(boost::associative_property_map<std::map<VertexDescriptor, double>>(rmap))
                     .color_map(boost::associative_property_map<std::map<VertexDescriptor, boost::default_color_type>>(cmap))
                     .distance_combine(std::plus<double>())
                     .distance_compare(std::less<double>())
                     );
 
     }catch(GoalFound const&){
         for(VertexDescriptor u=goal; u!=start; u = pmap[u]){
             result.push_back(QPointF(u.x,u.y));
         }
     }
 
     result.push_back(QPoint(start.x,start.y));
 
     return result;
 }
diff --git a/plugins/tools/selectiontools/KisMagneticWorker.h b/plugins/tools/selectiontools/KisMagneticWorker.h
index b4998f067b..4cbe3e699f 100644
--- a/plugins/tools/selectiontools/KisMagneticWorker.h
+++ b/plugins/tools/selectiontools/KisMagneticWorker.h
@@ -1,31 +1,34 @@
 /*
  *  Copyright (c) 2019 Kuntal Majumder <hellozee@disroot.org>
  *
  *  This library is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU Lesser General Public License as published by
  *  the Free Software Foundation; version 2.1 of the License.
  *
  *  This library 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 Lesser General Public License for more details.
  *
  *  You should have received a copy of the GNU Lesser General Public License
  *  along with this program; if not, write to the Free Software
  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  */
 
 #ifndef KISMAGNETICWORKER_H
 #define KISMAGNETICWORKER_H
 
 #include <kis_paint_device.h>
 #include <kritaselectiontools_export.h>
 
 class KRITASELECTIONTOOLS_EXPORT KisMagneticWorker{
 public:
-        QVector<QPointF> computeEdge(KisPaintDeviceSP dev, int radius, QPoint start, QPoint end);
+    KisMagneticWorker(KisPaintDeviceSP dev);
+    QVector<QPointF> computeEdge(int radius, QPoint start, QPoint end);
 private:
-        QRect calculateRect(QPoint p1, QPoint p2, int radius) const;
+    QRect calculateRect(QPoint p1, QPoint p2, int radius) const;
+
+    KisPaintDeviceSP m_dev;
 };
 
 #endif
diff --git a/plugins/tools/selectiontools/KisToolSelectMagnetic.cc b/plugins/tools/selectiontools/KisToolSelectMagnetic.cc
index f41e357c77..6368dd154a 100644
--- a/plugins/tools/selectiontools/KisToolSelectMagnetic.cc
+++ b/plugins/tools/selectiontools/KisToolSelectMagnetic.cc
@@ -1,260 +1,260 @@
 /*
  *  Copyright (c) 2019 Kuntal Majumder <hellozee@disroot.org>
  *
  *  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 2 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, write to the Free Software
  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  */
 
 #include "KisToolSelectMagnetic.h"
 
 #include <QApplication>
 #include <QPainter>
 #include <QWidget>
 #include <QPainterPath>
 #include <QLayout>
 #include <QVBoxLayout>
 
 #include <kis_debug.h>
 #include <klocalizedstring.h>
 
 #include <KoPointerEvent.h>
 #include <KoShapeController.h>
 #include <KoPathShape.h>
 #include <KoColorSpace.h>
 #include <KoCompositeOp.h>
 #include <KoViewConverter.h>
 
 #include <kis_layer.h>
 #include <kis_selection_options.h>
 #include <kis_cursor.h>
 #include <kis_image.h>
 
 #include "kis_painter.h"
 #include <brushengine/kis_paintop_registry.h>
 #include "canvas/kis_canvas2.h"
 #include "kis_pixel_selection.h"
 #include "kis_selection_tool_helper.h"
 
 #include "kis_algebra_2d.h"
 
-#include "KisMagneticWorker.h"
-
-
 #define FEEDBACK_LINE_WIDTH 2
 
 
 KisToolSelectMagnetic::KisToolSelectMagnetic(KoCanvasBase *canvas)
     : KisToolSelect(canvas,
                     KisCursor::load("tool_magnetic_selection_cursor.svg", 16, 16),
                     i18n("Magnetic Selection")),
-      m_continuedMode(false), m_complete(true)
-{
-}
+      m_continuedMode(false), m_complete(true), m_worker(image()->projection())
+{ }
 
 KisToolSelectMagnetic::~KisToolSelectMagnetic()
 {
 }
 
 void KisToolSelectMagnetic::keyPressEvent(QKeyEvent *event)
 {
     if (event->key() == Qt::Key_Control) {
         m_continuedMode = true;
     }
 
     KisToolSelect::keyPressEvent(event);
 }
 
 void KisToolSelectMagnetic::keyReleaseEvent(QKeyEvent *event)
 {
     if (event->key() == Qt::Key_Control ||
         !(event->modifiers() & Qt::ControlModifier)) {
 
         m_continuedMode = false;
         if (mode() != PAINT_MODE && !m_points.isEmpty()) {
             finishSelectionAction();
         }
     }
 
     KisToolSelect::keyReleaseEvent(event);
 }
 
+//the cursor is still tracked even when no mousebutton is pressed
 void KisToolSelectMagnetic::mouseMoveEvent(KoPointerEvent *event)
 {
     KisToolSelect::mouseMoveEvent(event);
     if(m_complete){
         finishSelectionAction();
         return;
     }
     m_lastCursorPos = convertToPixelCoord(event);
     auto current = QPoint(m_lastCursorPos.x(), m_lastCursorPos.y());
     //qDebug() << current;
-    KisMagneticWorker worker;
-    m_points = worker.computeEdge(image()->projection(), 2, m_lastAnchor, current);
+    m_points = m_worker.computeEdge(2, m_lastAnchor, current);
     m_paintPath = QPainterPath();
     m_paintPath.moveTo(pixelToView(m_points[m_points.count()-1]));
     for(int i=m_points.count()-2; i>0;i--){
         m_paintPath.lineTo(pixelToView(m_points[i]));
     }
 
     updateFeedback();
 
     if (m_continuedMode && mode() != PAINT_MODE) {
         updateContinuedMode();
     }
 }
 
+//press primary mouse button
 void KisToolSelectMagnetic::beginPrimaryAction(KoPointerEvent *event)
 {
     setMode(KisTool::PAINT_MODE);
     auto temp = convertToPixelCoord(event);
     m_lastAnchor = QPoint(temp.x(), temp.y());
     qDebug() << m_lastAnchor;
     m_complete = !m_complete; //just for testing
+    m_worker = KisMagneticWorker(image()->projection());
 }
 
+//drag while primary mouse button is pressed
 void KisToolSelectMagnetic::continuePrimaryAction(KoPointerEvent *event)
 {
     KisToolSelectBase::continuePrimaryAction(event);
 }
 
+//release primary mouse button
 void KisToolSelectMagnetic::endPrimaryAction(KoPointerEvent *event)
 {
     KisToolSelectBase::endPrimaryAction(event);
 }
 
 void KisToolSelectMagnetic::finishSelectionAction()
 {
     KisCanvas2 * kisCanvas = dynamic_cast<KisCanvas2*>(canvas());
     KIS_ASSERT_RECOVER_RETURN(kisCanvas);
     kisCanvas->updateCanvas();
     setMode(KisTool::HOVER_MODE);
 
     QRectF boundingViewRect =
         pixelToView(KisAlgebra2D::accumulateBounds(m_points));
 
     KisSelectionToolHelper helper(kisCanvas, kundo2_i18n("Select by Outline"));
 
     if (m_points.count() > 2 &&
         !helper.tryDeselectCurrentSelection(boundingViewRect, selectionAction())) {
         QApplication::setOverrideCursor(KisCursor::waitCursor());
 
         const SelectionMode mode =
             helper.tryOverrideSelectionMode(kisCanvas->viewManager()->selection(),
                                             selectionMode(),
                                             selectionAction());
 
         if (mode == PIXEL_SELECTION) {
 
             KisPixelSelectionSP tmpSel = KisPixelSelectionSP(new KisPixelSelection());
 
             KisPainter painter(tmpSel);
             painter.setPaintColor(KoColor(Qt::black, tmpSel->colorSpace()));
             painter.setAntiAliasPolygonFill(antiAliasSelection());
             painter.setFillStyle(KisPainter::FillStyleForegroundColor);
             painter.setStrokeStyle(KisPainter::StrokeStyleNone);
 
             painter.paintPolygon(m_points);
 
             QPainterPath cache;
             cache.addPolygon(m_points);
             cache.closeSubpath();
             tmpSel->setOutlineCache(cache);
 
             helper.selectPixelSelection(tmpSel, selectionAction());
         } else {
 
             KoPathShape* path = new KoPathShape();
             path->setShapeId(KoPathShapeId);
 
             QTransform resolutionMatrix;
             resolutionMatrix.scale(1 / currentImage()->xRes(), 1 / currentImage()->yRes());
             path->moveTo(resolutionMatrix.map(m_points[0]));
             for (int i = 1; i < m_points.count(); i++)
                 path->lineTo(resolutionMatrix.map(m_points[i]));
             path->close();
             path->normalize();
 
             helper.addSelectionShape(path, selectionAction());
         }
         QApplication::restoreOverrideCursor();
     }
 
     m_points.clear();
     m_paintPath = QPainterPath();
 }
 
 void KisToolSelectMagnetic::paint(QPainter& gc, const KoViewConverter &converter)
 {
     Q_UNUSED(converter);
 
     if ((mode() == KisTool::PAINT_MODE || m_continuedMode) &&
         !m_points.isEmpty()) {
 
         QPainterPath outline = m_paintPath;
         if (m_continuedMode && mode() != KisTool::PAINT_MODE) {
             outline.lineTo(pixelToView(m_lastCursorPos));
         }
         paintToolOutline(&gc, outline);
     }
 }
 
 
 
 void KisToolSelectMagnetic::updateFeedback()
 {
     if (m_points.count() > 1) {
         qint32 lastPointIndex = m_points.count() - 1;
 
         QRectF updateRect = QRectF(m_points[lastPointIndex - 1], m_points[lastPointIndex]).normalized();
         updateRect = kisGrowRect(updateRect, FEEDBACK_LINE_WIDTH);
 
         updateCanvasPixelRect(updateRect);
     }
 }
 
 void KisToolSelectMagnetic::updateContinuedMode()
 {
     if (!m_points.isEmpty()) {
         qint32 lastPointIndex = m_points.count() - 1;
 
         QRectF updateRect = QRectF(m_points[lastPointIndex - 1], m_lastCursorPos).normalized();
         updateRect = kisGrowRect(updateRect, FEEDBACK_LINE_WIDTH);
 
         updateCanvasPixelRect(updateRect);
     }
 }
 
 void KisToolSelectMagnetic::deactivate()
 {
     KisCanvas2 * kisCanvas = dynamic_cast<KisCanvas2*>(canvas());
     KIS_ASSERT_RECOVER_RETURN(kisCanvas);
     kisCanvas->updateCanvas();
 
     m_continuedMode = false;
     m_complete = true;
 
     KisTool::deactivate();
 }
 
 void KisToolSelectMagnetic::resetCursorStyle()
 {
     if (selectionAction() == SELECTION_ADD) {
         useCursor(KisCursor::load("tool_outline_selection_cursor_add.png", 6, 6));
     } else if (selectionAction() == SELECTION_SUBTRACT) {
         useCursor(KisCursor::load("tool_outline_selection_cursor_sub.png", 6, 6));
     } else {
         KisToolSelect::resetCursorStyle();
     }
 }
 
diff --git a/plugins/tools/selectiontools/KisToolSelectMagnetic.h b/plugins/tools/selectiontools/KisToolSelectMagnetic.h
index 9329b53e36..d31d46d271 100644
--- a/plugins/tools/selectiontools/KisToolSelectMagnetic.h
+++ b/plugins/tools/selectiontools/KisToolSelectMagnetic.h
@@ -1,90 +1,92 @@
 /*
  *  Copyright (c) 2019 Kuntal Majumder <hellozee@disroot.org>
  *
  *  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 2 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, write to the Free Software
  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  */
 
 #ifndef KIS_TOOL_SELECT_MAGNETIC_H_
 #define KIS_TOOL_SELECT_MAGNETIC_H_
 
 #include <QPoint>
 #include "KisSelectionToolFactoryBase.h"
 #include <kis_tool_select_base.h>
 #include <kis_icon.h>
+#include "KisMagneticWorker.h"
 
 class QPainterPath;
 
 class KisToolSelectMagnetic : public KisToolSelect
 {
     Q_OBJECT
 
 public:
     KisToolSelectMagnetic(KoCanvasBase *canvas);
     ~KisToolSelectMagnetic() override;
     void beginPrimaryAction(KoPointerEvent *event) override;
     void continuePrimaryAction(KoPointerEvent *event) override;
     void endPrimaryAction(KoPointerEvent *event) override;
     void paint(QPainter& gc, const KoViewConverter &converter) override;
 
     void keyPressEvent(QKeyEvent *event) override;
     void keyReleaseEvent(QKeyEvent *event) override;
 
     void mouseMoveEvent(KoPointerEvent *event) override;
 
     void resetCursorStyle();
 
 public Q_SLOTS:
     void deactivate() override;
 
 protected:
     using KisToolSelectBase::m_widgetHelper;
 
 private:
     void finishSelectionAction();
     void updateFeedback();
     void updateContinuedMode();
     void updateCanvas();
 
     QPainterPath m_paintPath;
     vQPointF m_points;
     bool m_continuedMode;
     QPointF m_lastCursorPos;
     QPoint m_lastAnchor;
     bool m_complete;
+    KisMagneticWorker m_worker;
 };
 
 class KisToolSelectMagneticFactory : public KisSelectionToolFactoryBase
 {
 public:
     KisToolSelectMagneticFactory()
         : KisSelectionToolFactoryBase("KisToolSelectMagnetic")
     {
         setToolTip(i18n("Magnetic Selection Tool"));
         setSection(TOOL_TYPE_SELECTION);
         setIconName(koIconNameCStr("tool_magnetic_selection"));
         setPriority(8);
         setActivationShapeId(KRITA_TOOL_ACTIVATION_ID);
     }
 
     ~KisToolSelectMagneticFactory() override {}
 
     KoToolBase * createTool(KoCanvasBase *canvas) override {
         return new KisToolSelectMagnetic(canvas);
     }
 };
 
 
 #endif //__selecttoolmagnetic_h__
 
diff --git a/plugins/tools/selectiontools/tests/KisMagneticWorkerTest.cc b/plugins/tools/selectiontools/tests/KisMagneticWorkerTest.cc
index 0a3a44030d..290450e994 100644
--- a/plugins/tools/selectiontools/tests/KisMagneticWorkerTest.cc
+++ b/plugins/tools/selectiontools/tests/KisMagneticWorkerTest.cc
@@ -1,117 +1,117 @@
 /*
  *  Copyright (c) 2019 Kuntal Majumder <hellozee@disroot.org>
  *
  *  This library is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU Lesser General Public License as published by
  *  the Free Software Foundation; version 2.1 of the License.
  *
  *  This library 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 Lesser General Public License for more details.
  *
  *  You should have received a copy of the GNU Lesser General Public License
  *  along with this program; if not, write to the Free Software
  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  */
 
 #include "KisMagneticWorkerTest.h"
 
 #include <KisMagneticWorker.h>
 #include <kis_paint_device.h>
 #include <kis_painter.h>
 #include <testutil.h>
 #include <kis_paint_device_debug_utils.h>
 
 #include <QDebug>
 
 inline KisPaintDeviceSP loadTestImage(const QString &name, bool convertToAlpha)
 {
     QImage image(TestUtil::fetchDataFileLazy(name));
     KisPaintDeviceSP dev = new KisPaintDevice(KoColorSpaceRegistry::instance()->rgb8());
     dev->convertFromQImage(image, 0);
 
     if (convertToAlpha) {
         dev = KisPainter::convertToAlphaAsAlpha(dev);
     }
 
     return dev;
 }
 
 void KisMagneticWorkerTest::testWorker()
 {
     KisPaintDeviceSP dev = loadTestImage("test_main.png", false);
     const QRect rect = dev->exactBounds();
     KisPaintDeviceSP grayscaleDev = KisPainter::convertToAlphaAsGray(dev);
-    KisMagneticWorker worker;
+    KisMagneticWorker worker(grayscaleDev);
     KIS_DUMP_DEVICE_2(dev, rect, "main", "dd");
 
     const QPoint startPos(40, 10);
     const QPoint endPos(50, 65);
 
 
-    auto points = worker.computeEdge(grayscaleDev, 10, startPos, endPos);
+    auto points = worker.computeEdge(10, startPos, endPos);
     KIS_DUMP_DEVICE_2(grayscaleDev, rect, "draw", "dd");
 
     QVector<QPointF> result = { QPointF(50,65),
                                 QPointF(49,64),
                                 QPointF(48,63),
                                 QPointF(47,62),
                                 QPointF(46,61),
                                 QPointF(45,60),
                                 QPointF(44,59),
                                 QPointF(44,58),
                                 QPointF(44,57),
                                 QPointF(44,56),
                                 QPointF(44,55),
                                 QPointF(44,54),
                                 QPointF(44,53),
                                 QPointF(44,52),
                                 QPointF(44,51),
                                 QPointF(44,50),
                                 QPointF(44,49),
                                 QPointF(44,48),
                                 QPointF(44,47),
                                 QPointF(44,46),
                                 QPointF(44,45),
                                 QPointF(44,44),
                                 QPointF(44,43),
                                 QPointF(44,42),
                                 QPointF(43,41),
                                 QPointF(43,40),
                                 QPointF(43,39),
                                 QPointF(44,38),
                                 QPointF(44,37),
                                 QPointF(44,36),
                                 QPointF(44,35),
                                 QPointF(44,34),
                                 QPointF(44,33),
                                 QPointF(44,32),
                                 QPointF(44,31),
                                 QPointF(44,30),
                                 QPointF(44,29),
                                 QPointF(44,28),
                                 QPointF(44,27),
                                 QPointF(44,26),
                                 QPointF(44,25),
                                 QPointF(44,24),
                                 QPointF(44,23),
                                 QPointF(44,22),
                                 QPointF(44,21),
                                 QPointF(44,20),
                                 QPointF(44,19),
                                 QPointF(44,18),
                                 QPointF(43,17),
                                 QPointF(44,16),
                                 QPointF(44,15),
                                 QPointF(44,14),
                                 QPointF(44,13),
                                 QPointF(43,12),
                                 QPointF(42,11),
                                 QPointF(41,11),
                                 QPointF(40,10)};
 
     QCOMPARE(result, points);
 }
 
 QTEST_MAIN(KisMagneticWorkerTest)