Follow grainline.

src/app/puzzle/layout/layoutdef.h

@@ -55,6 +55,21 @@ struct VPTransformationOrigon
 {
     QPointF origin{};
     bool    custom{false};
+
+    bool operator==(const VPTransformationOrigon &origin) const;
+    bool operator!=(const VPTransformationOrigon &origin) const;
 };
 
+//---------------------------------------------------------------------------------------------------------------------
+inline bool VPTransformationOrigon::operator==(const VPTransformationOrigon &origin) const
+{
+    return this->origin == origin.origin && custom == origin.custom;
+}
+
+//---------------------------------------------------------------------------------------------------------------------
+inline bool VPTransformationOrigon::operator!=(const VPTransformationOrigon &origin) const
+{
+    return !VPTransformationOrigon::operator==(origin);
+}
+
 #endif // LAYOUTDEF_H

src/app/puzzle/layout/vplayout.cpp

@@ -108,6 +108,23 @@ auto VPLayout::GetPieces() const -> QList<VPPiecePtr>
     return m_pieces.values();
 }
 
+//---------------------------------------------------------------------------------------------------------------------
+auto VPLayout::GetPlacedPieces() const -> QList<VPPiecePtr>
+{
+    QList<VPPiecePtr> pieces;
+    pieces.reserve(m_pieces.size());
+
+    for (const auto& piece : m_pieces)
+    {
+        if (not piece->isNull() && piece->Sheet() != VPSheetPtr() && piece->Sheet() != m_trashSheet)
+        {
+            pieces.append(piece);
+        }
+    }
+
+    return pieces;
+}
+
 //---------------------------------------------------------------------------------------------------------------------
 auto VPLayout::GetUnplacedPieces() const -> QList<VPPiecePtr>
 {

src/app/puzzle/layout/vplayout.h

@@ -49,6 +49,7 @@ public:
     static void AddPiece(const VPLayoutPtr &layout, const VPPiecePtr &piece);
 
     auto GetPieces() const -> QList<VPPiecePtr>;
+    auto GetPlacedPieces() const -> QList<VPPiecePtr>;
     auto GetUnplacedPieces() const -> QList<VPPiecePtr>;
     auto GetTrashedPieces() const -> QList<VPPiecePtr>;
 

src/app/puzzle/layout/vppiece.cpp

@@ -76,7 +76,7 @@ auto VPPiece::GetPosition() -> QPointF
 }
 
 //---------------------------------------------------------------------------------------------------------------------
-void VPPiece::RotateToGrainline()
+void VPPiece::RotateToGrainline(const VPTransformationOrigon &origin)
 {
     VPSheetPtr sheet = Sheet();
     if (not IsGrainlineEnabled() || sheet.isNull())
@@ -105,7 +105,8 @@ void VPPiece::RotateToGrainline()
             atFront.setAngle(90);
         }
 
-        return grainline.angleTo(atFront);
+        qreal angleTo = grainline.angleTo(atFront);
+        return angleTo;
     };
 
     auto DegreesAtRear = [grainline, canonical, grainlineType]()
@@ -113,7 +114,8 @@ void VPPiece::RotateToGrainline()
         QLineF atRear = canonical;
         atRear.setAngle(grainlineType == GrainlineType::Vertical ? 270 : 180);
 
-        return grainline.angleTo(atRear);
+        qreal angleTo = grainline.angleTo(atRear);
+        return angleTo;
     };
 
     GrainlineArrowDirection type = GrainlineArrowType();
@@ -129,11 +131,26 @@ void VPPiece::RotateToGrainline()
     }
     else
     {
-        degrees = qMin(DegreesAtFront(), DegreesAtRear());
+        const qreal atFront = DegreesAtFront();
+        if (atFront <= 90 || atFront >= 270)
+        {
+            degrees = atFront;
+        }
+        else
+        {
+            degrees = DegreesAtRear();
+        }
     }
 
+    if (origin.custom)
+    {
         Rotate(MappedDetailBoundingRect().center(), degrees);
     }
+    else
+    {
+        Rotate(origin.origin, degrees);
+    }
+}
 
 //---------------------------------------------------------------------------------------------------------------------
 void VPPiece::SetSelected(bool value)

src/app/puzzle/layout/vppiece.h

@@ -64,7 +64,7 @@ public:
     /**
      * @brief RotateToGrainline  rotates the piece to follow the grainline
      */
-    void RotateToGrainline();
+    void RotateToGrainline(const VPTransformationOrigon &origin);
 
     /**
      * @brief SetSelected Sets wether the piece is selected

src/app/puzzle/scene/vpgraphicspiececontrols.cpp

@@ -71,17 +71,20 @@ enum class HandleCorner : int
     BottomLeft = 4
 };
 
-auto TransformationOrigin(const VPLayoutPtr &layout, const QRectF &boundingRect) -> QPointF
+auto TransformationOrigin(const VPLayoutPtr &layout, const QRectF &boundingRect) -> VPTransformationOrigon
 {
     SCASSERT(layout != nullptr)
     VPSheetPtr sheet = layout->GetFocusedSheet();
     if (not sheet.isNull())
     {
-        VPTransformationOrigon origin = sheet->TransformationOrigin();
+        return sheet->TransformationOrigin();
-        return origin.origin;
     }
 
-    return boundingRect.center();
+    VPTransformationOrigon origin;
+    origin.origin = boundingRect.center();
+    origin.custom = false;
+
+    return origin;
 }
 }  // namespace
 
@@ -233,8 +236,8 @@ auto VPGraphicsTransformationOrigin::RotationCenter(QPainter *painter) const ->
 
     const qreal scale = SceneScale(scene());
     qreal radius = centerRadius1/scale;
-    QPointF transformationOrigin = TransformationOrigin(m_layout, QRectF());
+    VPTransformationOrigon transformationOrigin = TransformationOrigin(m_layout, QRectF());
-    QRectF rect(transformationOrigin.x()-radius, transformationOrigin.y()-radius, radius*2., radius*2.);
+    QRectF rect(transformationOrigin.origin.x()-radius, transformationOrigin.origin.y()-radius, radius*2., radius*2.);
 
     QPainterPath center1;
     center1.addEllipse(rect);
@@ -249,7 +252,7 @@ auto VPGraphicsTransformationOrigin::RotationCenter(QPainter *painter) const ->
     path.addPath(center1);
 
     radius = centerRadius2/scale;
-    rect = QRectF(transformationOrigin.x()-radius, transformationOrigin.y()-radius, radius*2., radius*2.);
+    rect = QRectF(transformationOrigin.origin.x()-radius, transformationOrigin.origin.y()-radius, radius*2., radius*2.);
 
     QPainterPath center2;
     center2.addEllipse(rect);
@@ -271,8 +274,8 @@ auto VPGraphicsTransformationOrigin::Center1() const -> QPainterPath
 {
     const qreal scale = SceneScale(scene());
     qreal radius = centerRadius1/scale;
-    QPointF transformationOrigin = TransformationOrigin(m_layout, QRectF());
+    VPTransformationOrigon transformationOrigin = TransformationOrigin(m_layout, QRectF());
-    QRectF rect(transformationOrigin.x()-radius, transformationOrigin.y()-radius, radius*2., radius*2.);
+    QRectF rect(transformationOrigin.origin.x()-radius, transformationOrigin.origin.y()-radius, radius*2., radius*2.);
 
     QPainterPath center1;
     center1.addEllipse(rect);
@@ -285,8 +288,9 @@ auto VPGraphicsTransformationOrigin::Center2() const -> QPainterPath
 {
     const qreal scale = SceneScale(scene());
     qreal radius = centerRadius2/scale;
-    QPointF transformationOrigin = TransformationOrigin(m_layout, QRectF());
+    VPTransformationOrigon transformationOrigin = TransformationOrigin(m_layout, QRectF());
-    QRectF rect = QRectF(transformationOrigin.x()-radius, transformationOrigin.y()-radius, radius*2., radius*2.);
+    QRectF rect = QRectF(transformationOrigin.origin.x()-radius, transformationOrigin.origin.y()-radius, radius*2.,
+                         radius*2.);
 
     QPainterPath center2;
     center2.addEllipse(rect);
@@ -389,6 +393,7 @@ void VPGraphicsPieceControls::mousePressEvent(QGraphicsSceneMouseEvent *event)
     if(event->button() == Qt::LeftButton)
     {
         m_rotationStartPoint = event->scenePos();
+        m_rotationSum = 0;
         m_controlsVisible = false;
         m_handleCorner = HandleCorner(event->scenePos());
         m_ignorePieceTransformation = true;
@@ -470,13 +475,18 @@ void VPGraphicsPieceControls::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
     QPointF rotationNewPoint = event->scenePos();
 
     // get the angle from the center to the initial click point
-    QPointF rotationOrigin = TransformationOrigin(m_layout, m_pieceRect);
+    VPTransformationOrigon rotationOrigin = TransformationOrigin(m_layout, m_pieceRect);
-    QLineF initPosition(rotationOrigin, m_rotationStartPoint);
+    QLineF initPosition(rotationOrigin.origin, m_rotationStartPoint);
-    QLineF initRotationPosition(rotationOrigin, rotationNewPoint);
+    QLineF initRotationPosition(rotationOrigin.origin, rotationNewPoint);
 
-    qreal angle = initPosition.angleTo(initRotationPosition);
+    qreal rotateOn = initPosition.angleTo(initRotationPosition);
 
-    if (not qFuzzyIsNull(angle))
+    if (rotateOn > 180)
+    {
+        rotateOn = rotateOn - 360.;
+    }
+
+    if (not qFuzzyIsNull(rotateOn))
     {
         auto PreparePieces = [this]()
         {
@@ -499,14 +509,32 @@ void VPGraphicsPieceControls::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
         VPLayoutPtr layout = m_layout.toStrongRef();
         if (not layout.isNull())
         {
+            if (layout->LayoutSettings().GetFollowGrainline() && not rotationOrigin.custom)
+            {
+                if (m_rotationSum > 90 || m_rotationSum < -90)
+                {
+                    m_rotationSum = rotateOn;
+                }
+                else
+                {
+                    m_rotationSum += rotateOn;
+                }
+            }
+            else
+            {
+                m_rotationSum = rotateOn;
+            }
+
             if (pieces.size() == 1)
             {
-                auto *command = new VPUndoPieceRotate(pieces.first(), rotationOrigin, angle, allowChangeMerge);
+                auto *command = new VPUndoPieceRotate(pieces.first(), rotationOrigin, rotateOn, m_rotationSum,
+                                                      allowChangeMerge);
                 layout->UndoStack()->push(command);
             }
             else if (pieces.size() > 1)
             {
-                auto *command = new VPUndoPiecesRotate(pieces, rotationOrigin, angle, allowChangeMerge);
+                auto *command = new VPUndoPiecesRotate(pieces, rotationOrigin, rotateOn, m_rotationSum,
+                                                       allowChangeMerge);
                 layout->UndoStack()->push(command);
             }
         }
@@ -514,8 +542,8 @@ void VPGraphicsPieceControls::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
 
     if (m_originSaved && m_savedOrigin.custom)
     {
-        QLineF line(rotationOrigin, m_savedOrigin.origin);
+        QLineF line(rotationOrigin.origin, m_savedOrigin.origin);
-        line.setAngle(line.angle()+angle);
+        line.setAngle(line.angle()+rotateOn);
         m_savedOrigin.origin = line.p2();
     }
 

src/app/puzzle/scene/vpgraphicspiececontrols.h

@@ -108,6 +108,7 @@ private:
     Q_DISABLE_COPY(VPGraphicsPieceControls)
     QRectF          m_pieceRect{};
     QPointF         m_rotationStartPoint{};
+    qreal           m_rotationSum{0};
     bool            m_controlsVisible{true};
     VPLayoutWeakPtr m_layout{};
     int             m_handleCorner{0};

src/app/puzzle/scene/vpmaingraphicsview.cpp

@@ -371,6 +371,7 @@ void VPMainGraphicsView::keyReleaseEvent(QKeyEvent *event)
             m_rotationControls->SetIgnorePieceTransformation(false);
             m_rotationControls->on_UpdateControls();
             m_rotationControls->on_HideHandles(false);
+            m_rotationSum = 0;
         }
     }
     VMainGraphicsView::keyReleaseEvent(event);
@@ -558,16 +559,32 @@ void VPMainGraphicsView::RotatePiecesByAngle(qreal angle)
         return pieces;
     };
 
+    if (layout->LayoutSettings().GetFollowGrainline() && not origin.custom)
+    {
+        if (m_rotationSum > 90 || m_rotationSum < -90)
+        {
+            m_rotationSum = angle;
+        }
+        else
+        {
+            m_rotationSum += angle;
+        }
+    }
+    else
+    {
+        m_rotationSum = angle;
+    }
+
     QList<VPPiecePtr> pieces = PreparePieces();
 
     if (pieces.size() == 1)
     {
-        auto *command = new VPUndoPieceRotate(pieces.first(), origin.origin, angle, m_allowChangeMerge);
+        auto *command = new VPUndoPieceRotate(pieces.first(), origin, angle, m_rotationSum, m_allowChangeMerge);
         layout->UndoStack()->push(command);
     }
     else if (pieces.size() > 1)
     {
-        auto *command = new VPUndoPiecesRotate(pieces, origin.origin, angle, m_allowChangeMerge);
+        auto *command = new VPUndoPiecesRotate(pieces, origin, angle, m_rotationSum, m_allowChangeMerge);
         layout->UndoStack()->push(command);
     }
 

src/app/puzzle/scene/vpmaingraphicsview.h

@@ -124,6 +124,8 @@ private:
     bool m_showGridTmp{false};
     bool m_allowChangeMerge{false};
 
+    qreal m_rotationSum{0};
+
     void ConnectPiece(VPGraphicsPiece *piece);
 
     void RotatePiecesByAngle(qreal angle);

src/app/puzzle/undocommands/vpundomovepieceonsheet.cpp

@@ -41,6 +41,12 @@ VPUndoMovePieceOnSheet::VPUndoMovePieceOnSheet(const VPSheetPtr &sheet, const VP
 
     m_oldSheet = piece->Sheet();
 
+    VPLayoutPtr layout = piece->Layout();
+    if (not layout.isNull())
+    {
+        m_followGrainline = layout->LayoutSettings().GetFollowGrainline();
+    }
+
     setText(tr("move piece on sheet"));
 }
 
@@ -105,6 +111,14 @@ void VPUndoMovePieceOnSheet::redo()
     {
         piece->SetSheet(sourceSheet);
 
+        if (m_followGrainline)
+        {
+            VPTransformationOrigon origin;
+            origin.custom = true;
+
+            piece->RotateToGrainline(origin);
+        }
+
         if (not layout.isNull())
         {
             emit layout->PieceSheetChanged(piece);

src/app/puzzle/undocommands/vpundomovepieceonsheet.h

@@ -48,6 +48,7 @@ private:
     VPSheetWeakPtr m_oldSheet{};
     VPSheetWeakPtr m_sheet;
     VPPieceWeakPtr m_piece;
+    bool           m_followGrainline{false};
 };
 
 #endif // VPUNDOMOVEPIECEONSHEET_H

src/app/puzzle/undocommands/vpundopiecerotate.cpp

@@ -29,18 +29,35 @@
 #include "../layout/vppiece.h"
 #include "../layout/vplayout.h"
 
+namespace
+{
+auto RoundAngle(qreal angle) -> qreal
+{
+    QLineF l(10, 10, 100, 10);
+    l.setAngle(angle);
+    return l.angle();
+}
+}
+
 //---------------------------------------------------------------------------------------------------------------------
-VPUndoPieceRotate::VPUndoPieceRotate(const VPPiecePtr &piece, const QPointF &origin, qreal angle, bool allowMerge,
+VPUndoPieceRotate::VPUndoPieceRotate(const VPPiecePtr &piece, const VPTransformationOrigon &origin, qreal angle,
-                                     QUndoCommand *parent)
+                                     qreal angleSum, bool allowMerge, QUndoCommand *parent)
     : VPUndoCommand(allowMerge, parent),
       m_piece(piece),
       m_origin(origin),
-      m_angle(angle)
+      m_angle(angle),
+      m_angleSum(angleSum)
 {
     SCASSERT(not piece.isNull())
 
     m_oldTransform = piece->GetMatrix();
 
+    VPLayoutPtr layout = piece->Layout();
+    if (not layout.isNull())
+    {
+        m_followGrainline = layout->LayoutSettings().GetFollowGrainline();
+    }
+
     setText(tr("rotate piece"));
 }
 
@@ -88,8 +105,33 @@ void VPUndoPieceRotate::redo()
         layout->SetFocusedSheet(piece->Sheet());
     }
 
-    piece->Rotate(m_origin, m_angle);
+    if (m_firstCall)
+    {
+        if (m_followGrainline && piece->IsGrainlineEnabled())
+        {
+            piece->Rotate(m_origin.origin, m_angleSum);
+        }
+        else
+        {
+            piece->Rotate(m_origin.origin, m_angle);
+        }
+    }
+    else
+    {
+        piece->Rotate(m_origin.origin, m_angle);
+    }
+
+    if (m_followGrainline)
+    {
+        piece->RotateToGrainline(m_origin);
+    }
+
     emit layout->PieceTransformationChanged(piece);
+
+    if (m_firstCall)
+    {
+        m_firstCall = false;
+    }
 }
 
 //---------------------------------------------------------------------------------------------------------------------
@@ -105,12 +147,14 @@ auto VPUndoPieceRotate::mergeWith(const QUndoCommand *command) -> bool
 
     VPPiecePtr piece = Piece();
     if (not moveCommand->AllowMerge() || (moveCommand->Piece().isNull() || piece.isNull()) ||
-            moveCommand->Piece() != piece || moveCommand->Origin() != m_origin)
+            moveCommand->Piece() != piece || moveCommand->Origin() != m_origin ||
+            moveCommand->FollowGrainline() != m_followGrainline)
     {
         return false;
     }
 
     m_angle += moveCommand->Angle();
+    m_angle = RoundAngle(m_angle);
     return true;
 }
 
@@ -122,11 +166,12 @@ auto VPUndoPieceRotate::id() const -> int
 
 // rotate pieces
 //---------------------------------------------------------------------------------------------------------------------
-VPUndoPiecesRotate::VPUndoPiecesRotate(const QList<VPPiecePtr> &pieces, const QPointF &origin, qreal angle,
+VPUndoPiecesRotate::VPUndoPiecesRotate(const QList<VPPiecePtr> &pieces, const VPTransformationOrigon &origin,
-                                       bool allowMerge, QUndoCommand *parent)
+                                       qreal angle, qreal angleSum, bool allowMerge, QUndoCommand *parent)
     : VPUndoCommand(allowMerge, parent),
       m_origin(origin),
-      m_angle(angle)
+      m_angle(angle),
+      m_angleSum(angleSum)
 {
     setText(QObject::tr("rotate pieces"));
 
@@ -138,6 +183,12 @@ VPUndoPiecesRotate::VPUndoPiecesRotate(const QList<VPPiecePtr> &pieces, const QP
             m_oldTransforms.insert(piece->GetUniqueID(), piece->GetMatrix());
         }
     }
+
+    VPLayoutPtr layout = Layout();
+    if (not layout.isNull())
+    {
+        m_followGrainline = layout->LayoutSettings().GetFollowGrainline();
+    }
 }
 
 //---------------------------------------------------------------------------------------------------------------------
@@ -199,10 +250,35 @@ void VPUndoPiecesRotate::redo()
         VPPiecePtr p = piece.toStrongRef();
         if (not p.isNull())
         {
-            p->Rotate(m_origin, m_angle);
+            if (m_firstCall)
+            {
+                if (m_followGrainline && p->IsGrainlineEnabled())
+                {
+                    p->Rotate(m_origin.origin, m_angleSum);
+                }
+                else
+                {
+                    p->Rotate(m_origin.origin, m_angle);
+                }
+            }
+            else
+            {
+                p->Rotate(m_origin.origin, m_angle);
+            }
+
+            if (m_followGrainline)
+            {
+                p->RotateToGrainline(m_origin);
+            }
+
             emit layout->PieceTransformationChanged(p);
         }
     }
+
+    if (m_firstCall)
+    {
+        m_firstCall = false;
+    }
 }
 
 //---------------------------------------------------------------------------------------------------------------------
@@ -216,12 +292,14 @@ auto VPUndoPiecesRotate::mergeWith(const QUndoCommand *command) -> bool
     const auto *moveCommand = dynamic_cast<const VPUndoPiecesRotate *>(command);
     SCASSERT(moveCommand != nullptr)
 
-    if (not moveCommand->AllowMerge() || moveCommand->PieceIds() != PieceIds() || moveCommand->Origin() != m_origin)
+    if (not moveCommand->AllowMerge() || moveCommand->PieceIds() != PieceIds() || moveCommand->Origin() != m_origin ||
+            moveCommand->FollowGrainline() != m_followGrainline)
     {
         return false;
     }
 
     m_angle += moveCommand->Angle();
+    m_angle = RoundAngle(m_angle);
     return true;
 }
 

src/app/puzzle/undocommands/vpundopiecerotate.h

@@ -38,8 +38,8 @@ class VPUndoPieceRotate : public VPUndoCommand
 {
     Q_OBJECT
 public:
-    VPUndoPieceRotate(const VPPiecePtr &piece, const QPointF &origin, qreal angle, bool allowMerge = false,
+    VPUndoPieceRotate(const VPPiecePtr &piece, const VPTransformationOrigon &origin, qreal angle, qreal angleSum,
-                      QUndoCommand *parent = nullptr);
+                      bool allowMerge = false, QUndoCommand *parent = nullptr);
 
     virtual ~VPUndoPieceRotate()=default;
 
@@ -50,16 +50,21 @@ public:
     virtual auto id() const -> int override ;
 
     auto Piece() const -> VPPiecePtr;
-    auto Origin() const -> QPointF;
+    auto Origin() const -> VPTransformationOrigon;
     auto Angle() const -> qreal;
 
+    bool FollowGrainline() const;
+
 private:
     Q_DISABLE_COPY(VPUndoPieceRotate)
 
+    bool           m_firstCall{true};
     VPPieceWeakPtr m_piece;
     QTransform     m_oldTransform{};
-    QPointF        m_origin;
+    VPTransformationOrigon m_origin;
     qreal          m_angle;
+    qreal          m_angleSum;
+    bool           m_followGrainline{false};
 };
 
 //---------------------------------------------------------------------------------------------------------------------
@@ -69,7 +74,7 @@ inline auto VPUndoPieceRotate::Piece() const -> VPPiecePtr
 }
 
 //---------------------------------------------------------------------------------------------------------------------
-inline auto VPUndoPieceRotate::Origin() const -> QPointF
+inline auto VPUndoPieceRotate::Origin() const -> VPTransformationOrigon
 {
     return m_origin;
 }
@@ -80,13 +85,19 @@ inline auto VPUndoPieceRotate::Angle() const -> qreal
     return m_angle;
 }
 
+//---------------------------------------------------------------------------------------------------------------------
+inline auto VPUndoPieceRotate::FollowGrainline() const -> bool
+{
+    return m_followGrainline;
+}
+
 // Rotate pieces
 class VPUndoPiecesRotate : public VPUndoCommand
 {
     Q_OBJECT
 public:
-    explicit VPUndoPiecesRotate(const QList<VPPiecePtr> &pieces, const QPointF &origin, qreal angle,
+    explicit VPUndoPiecesRotate(const QList<VPPiecePtr> &pieces, const VPTransformationOrigon &origin, qreal angle,
-                                bool allowMerge = false, QUndoCommand *parent = nullptr);
+                                qreal angleSum, bool allowMerge = false, QUndoCommand *parent = nullptr);
     virtual ~VPUndoPiecesRotate()=default;
 
     virtual void undo() override;
@@ -96,23 +107,27 @@ public:
     virtual auto id() const -> int override ;
 
     auto PieceIds() const -> QSet<QString>;
-    auto Origin() const -> QPointF;
+    auto Origin() const -> VPTransformationOrigon;
     auto Angle() const -> qreal;
+    auto FollowGrainline() const -> bool;
 
 private:
     Q_DISABLE_COPY(VPUndoPiecesRotate)
 
+    bool                      m_firstCall{true};
     QVector<VPPieceWeakPtr>   m_pieces{};
     QMap<QString, QTransform> m_oldTransforms{};
-    QPointF                   m_origin;
+    VPTransformationOrigon    m_origin;
     qreal                     m_angle;
+    qreal                     m_angleSum;
+    bool                      m_followGrainline{false};
 
     auto Layout() const -> VPLayoutPtr;
     auto Sheet() const -> VPSheetPtr;
 };
 
 //---------------------------------------------------------------------------------------------------------------------
-inline auto VPUndoPiecesRotate::Origin() const -> QPointF
+inline auto VPUndoPiecesRotate::Origin() const -> VPTransformationOrigon
 {
     return m_origin;
 }
@@ -123,4 +138,10 @@ inline auto VPUndoPiecesRotate::Angle() const -> qreal
     return m_angle;
 }
 
+//---------------------------------------------------------------------------------------------------------------------
+inline auto VPUndoPiecesRotate::FollowGrainline() const -> bool
+{
+    return m_followGrainline;
+}
+
 #endif // VPUNDOPIECEROTATE_H

src/app/puzzle/vpmainwindow.cpp

@@ -862,8 +862,13 @@ void VPMainWindow::InitPropertyTabLayout()
         if (not m_layout.isNull())
         {
             m_layout->LayoutSettings().SetFollowGrainline(checked);
+
+            if (checked)
+            {
+                RotatePiecesToGrainline();
+            }
+
             LayoutWasSaved(false);
-            // TODO update the QGraphicView
         }
     });
 
@@ -1742,6 +1747,11 @@ void VPMainWindow::SheetPaperSizeChanged()
     ui->toolButtonSheetLandscapeOrientation->blockSignals(true);
     ui->toolButtonSheetLandscapeOrientation->setChecked(not portrait);
     ui->toolButtonSheetLandscapeOrientation->blockSignals(false);
+
+    if (not m_layout.isNull() && m_layout->LayoutSettings().GetFollowGrainline())
+    {
+        RotatePiecesToGrainline();
+    }
 }
 
 //---------------------------------------------------------------------------------------------------------------------
@@ -1862,6 +1872,29 @@ void VPMainWindow::CorrectMaxMargins()
     CorrectTileMaxMargins();
 }
 
+//---------------------------------------------------------------------------------------------------------------------
+void VPMainWindow::RotatePiecesToGrainline()
+{
+    QList<VPSheetPtr> sheets = m_layout->GetSheets();
+    for(const auto& sheet : sheets)
+    {
+        if (not sheet.isNull())
+        {
+            QList<VPPiecePtr> pieces = sheet->GetPieces();
+            for(const auto& piece : pieces)
+            {
+                if (not piece.isNull() && piece->IsGrainlineEnabled())
+                {
+                    VPTransformationOrigon origin;
+                    origin.custom = true;
+                    piece->RotateToGrainline(origin);
+                    emit m_layout->PieceTransformationChanged(piece);
+                }
+            }
+        }
+    }
+}
+
 //---------------------------------------------------------------------------------------------------------------------
 void VPMainWindow::on_actionNew_triggered()
 {
@@ -2513,7 +2546,12 @@ void VPMainWindow::on_ApplyPieceTransformation()
                 if (not piece.isNull())
                 {
                     const QRectF rect = piece->MappedDetailBoundingRect();
-                    auto *command = new VPUndoPieceRotate(piece, rect.center(), angle);
+
+                    VPTransformationOrigon origin;
+                    origin.origin = rect.center();
+                    origin.custom = true;
+
+                    auto *command = new VPUndoPieceRotate(piece, origin, angle, angle);
                     m_layout->UndoStack()->push(command);
                 }
             }
@@ -2528,7 +2566,7 @@ void VPMainWindow::on_ApplyPieceTransformation()
             }
 
             VPTransformationOrigon origin = sheet->TransformationOrigin();
-            auto *command = new VPUndoPiecesRotate(selectedPieces, origin.origin, angle);
+            auto *command = new VPUndoPiecesRotate(selectedPieces, origin, angle, angle);
             m_layout->UndoStack()->push(command);
         }
     }

src/app/puzzle/vpmainwindow.h

@@ -454,6 +454,8 @@ private:
     void CorrectTileMaxMargins();
     void CorrectSheetMaxMargins();
     void CorrectMaxMargins();
+
+    void RotatePiecesToGrainline();
 };
 
 #endif // VPMAINWINDOW_H

src/app/puzzle/vpmainwindow.ui

@@ -189,7 +189,7 @@
         <enum>QTabWidget::Rounded</enum>
        </property>
        <property name="currentIndex">
-        <number>0</number>
+        <number>3</number>
        </property>
        <property name="iconSize">
         <size>

src/app/puzzle/xml/vplayoutfilereader.cpp

@@ -298,7 +298,7 @@ void VPLayoutFileReader::ReadControl(const VPLayoutPtr &layout)
     layout->LayoutSettings().SetWarningPiecesOutOfBound(ReadAttributeBool(attribs, ML::AttrWarningOutOfBound, trueStr));
     layout->LayoutSettings().SetStickyEdges(ReadAttributeBool(attribs, ML::AttrStickyEdges, trueStr));
     layout->LayoutSettings().SetPiecesGap(ReadAttributeDouble(attribs, ML::AttrPiecesGap, QChar('0')));
-//    layout->LayoutSettings().SetFollowGrainline(ReadAttributeBool(attribs, ML::AttrFollowGrainLine, trueStr));
+    layout->LayoutSettings().SetFollowGrainline(ReadAttributeBool(attribs, ML::AttrFollowGrainline, falseStr));
 
     readElementText();
 }

src/app/puzzle/xml/vplayoutfilewriter.cpp

@@ -176,7 +176,7 @@ void VPLayoutFileWriter::WriteProperties(const VPLayoutPtr &layout)
     SetAttribute(ML::AttrWarningOutOfBound, layout->LayoutSettings().GetWarningPiecesOutOfBound());
     SetAttribute(ML::AttrStickyEdges, layout->LayoutSettings().GetStickyEdges());
     SetAttribute(ML::AttrPiecesGap, layout->LayoutSettings().GetPiecesGap());
-//    SetAttribute(ML::AttrFollowGrainLine, layout->LayoutSettings().GetFollowGrainline());
+    SetAttribute(ML::AttrFollowGrainline, layout->LayoutSettings().GetFollowGrainline());
     writeEndElement(); // control
 
     WriteTiles(layout);

src/app/puzzle/xml/vplayoutliterals.cpp

@@ -73,7 +73,7 @@ const QString AttrRight                = QStringLiteral("right");
 const QString AttrBottom               = QStringLiteral("bottom");
 const QString AttrWidth                = QStringLiteral("width");
 const QString AttrLength               = QStringLiteral("length");
-const QString AttrFollowGrainLine      = QStringLiteral("followGrainLine");
+const QString AttrFollowGrainline      = QStringLiteral("followGrainline");
 const QString AttrID                   = QStringLiteral("id");
 const QString AttrMirrored             = QStringLiteral("mirrored");
 const QString AttrTransform            = QStringLiteral("transform");

src/app/puzzle/xml/vplayoutliterals.h

@@ -78,7 +78,7 @@ extern const QString AttrRight;
 extern const QString AttrBottom;
 extern const QString AttrWidth;
 extern const QString AttrLength;
-extern const QString AttrFollowGrainLine;
+extern const QString AttrFollowGrainline;
 extern const QString AttrID;
 extern const QString AttrMirrored;
 extern const QString AttrTransform;

src/libs/ifc/schema/layout/v0.1.0.xsd

@@ -27,6 +27,7 @@
                   <xs:attribute type="xs:boolean" name="warningSuperposition"/>
                   <xs:attribute type="xs:boolean" name="warningOutOfBound"/>
                   <xs:attribute type="xs:boolean" name="stickyEdges"/>
+                  <xs:attribute type="xs:boolean" name="followGrainline"/>
                   <xs:attribute type="xs:float" name="piecesGap"/>
                 </xs:complexType>
               </xs:element>