Sticky edges.

src/app/puzzle/layout/vppiece.cpp

@@ -31,6 +31,7 @@
 
 #include "../vmisc/def.h"
 #include "vpsheet.h"
+#include "vplayout.h"
 #include "../vlayout/vtextmanager.h"
 
 #include <QIcon>
@@ -39,6 +40,86 @@
 
 Q_LOGGING_CATEGORY(pPiece, "p.piece")
 
+namespace
+{
+constexpr qreal minStickyDistance = ToPixel(3, Unit::Mm);
+constexpr qreal maxStickyDistance = ToPixel(10, Unit::Mm);
+constexpr qreal stickyShift = ToPixel(1, Unit::Mm);
+
+//---------------------------------------------------------------------------------------------------------------------
+auto CutEdge(const QLineF &edge) -> QVector<QPointF>
+{
+    QVector<QPointF> points;
+    if (qFuzzyIsNull(stickyShift))
+    {
+        points.append(edge.p1());
+        points.append(edge.p2());
+    }
+    else
+    {
+        const int n = qFloor(edge.length()/stickyShift);
+
+        if (n <= 0)
+        {
+            points.append(edge.p1());
+            points.append(edge.p2());
+        }
+        else
+        {
+            points.reserve(n);
+            const qreal nShift = edge.length()/n;
+            for (int i = 1; i <= n+1; ++i)
+            {
+                QLineF l1 = edge;
+                l1.setLength(nShift*(i-1));
+                points.append(l1.p2());
+            }
+        }
+    }
+    return points;
+}
+
+//---------------------------------------------------------------------------------------------------------------------
+auto PrepareStickyPath(const QVector<QPointF> &path) -> QVector<QPointF>
+{
+    if (path.size() < 2)
+    {
+        return path;
+    }
+
+    QVector<QPointF> stickyPath;
+
+    for (int i=0; i<path.size(); ++i)
+    {
+        stickyPath += CutEdge(QLineF(path.at(i), path.at(i < path.size()-1 ? i+1 : 0)));
+    }
+
+    return stickyPath;
+}
+
+//---------------------------------------------------------------------------------------------------------------------
+auto ClosestDistance(const QVector<QPointF> &path1, const QVector<QPointF> &path2) -> QLineF
+{
+    qreal distance = INT_MAX;
+    QLineF closestDistance;
+
+    for (auto p1 : path1)
+    {
+        for (auto p2 : path2)
+        {
+            QLineF d(p1, p2);
+            if (d.length() <= distance)
+            {
+                distance = d.length();
+                closestDistance = d;
+            }
+        }
+    }
+
+    return closestDistance;
+}
+}  // namespace
+
 //---------------------------------------------------------------------------------------------------------------------
 VPPiece::VPPiece(const VLayoutPiece &layoutPiece)
     : VLayoutPiece(layoutPiece)
@@ -239,3 +320,111 @@ void VPPiece::Flip()
     SetMatrix(pieceMatrix);
     SetMirror(!IsMirror());
 }
+
+//---------------------------------------------------------------------------------------------------------------------
+auto VPPiece::StickyPosition(qreal &dx, qreal &dy) const -> bool
+{
+    VPLayoutPtr layout = Layout();
+    if (layout.isNull() || not layout->LayoutSettings().GetStickyEdges())
+    {
+        return false;
+    }
+
+    const qreal pieceGap = layout->LayoutSettings().GetPiecesGap();
+    if (pieceGap <= 0)
+    {
+        return false;
+    }
+
+    VPSheetPtr sheet = Sheet();
+    if (sheet.isNull())
+    {
+        return false;
+    }
+
+    QList<VPPiecePtr> allPieces = sheet->GetPieces();
+
+    if (allPieces.count() < 2)
+    {
+        return false;
+    }
+
+    QVector<QPointF> path = GetMappedExternalContourPoints();
+    QRectF boundingRect = VLayoutPiece::BoundingRect(path);
+    const qreal stickyDistance = pieceGap+minStickyDistance;
+    QRectF stickyZone = QRectF(boundingRect.topLeft().x()-stickyDistance, boundingRect.topLeft().y()-stickyDistance,
+                               boundingRect.width()+stickyDistance*2, boundingRect.height()+stickyDistance*2);
+
+    QVector<QPointF> stickyPath = PrepareStickyPath(path);
+    QLineF closestDistance;
+
+    for (const auto& piece : allPieces)
+    {
+        if (piece.isNull() || piece->GetUniqueID() == GetUniqueID())
+        {
+            continue;
+        }
+
+        QVector<QPointF> piecePath = piece->GetMappedExternalContourPoints();
+        QRectF pieceBoundingRect = VLayoutPiece::BoundingRect(piecePath);
+
+        if (stickyZone.intersects(pieceBoundingRect) || pieceBoundingRect.contains(stickyZone) ||
+                stickyZone.contains(pieceBoundingRect))
+        {
+            if (not VPPiece::PathsSuperposition(path, piecePath))
+            {
+                QVector<QPointF> pieceStickyPath = PrepareStickyPath(piecePath);
+                closestDistance = ClosestDistance(stickyPath, pieceStickyPath);
+            }
+        }
+    }
+
+    if (closestDistance.isNull())
+    {
+        return false;
+    }
+
+    const qreal extraZone = qBound(minStickyDistance, pieceGap * 50 / 100, maxStickyDistance);
+    const qreal length = closestDistance.length();
+
+    if (length > pieceGap && length <= pieceGap + extraZone)
+    {
+        closestDistance.setLength(length - pieceGap);
+        QPointF diff = closestDistance.p2() - closestDistance.p1();
+        dx = diff.x();
+        dy = diff.y();
+        return true;
+    }
+
+    if (length < pieceGap && length >= pieceGap - extraZone)
+    {
+        closestDistance.setAngle(closestDistance.angle() + 180);
+        closestDistance.setLength(pieceGap - length);
+        QPointF diff = closestDistance.p2() - closestDistance.p1();
+        dx = diff.x();
+        dy = diff.y();
+        return true;
+    }
+
+    return false;
+}
+
+//---------------------------------------------------------------------------------------------------------------------
+auto VPPiece::PathsSuperposition(const QVector<QPointF> &path1, const QVector<QPointF> &path2) -> bool
+{
+    const QRectF path1Rect = VLayoutPiece::BoundingRect(path1);
+    const QPainterPath path1Path = VAbstractPiece::PainterPath(path1);
+
+    const QRectF path2Rect = VLayoutPiece::BoundingRect(path2);
+    const QPainterPath path2Path = VAbstractPiece::PainterPath(path2);
+
+    if (path1Rect.intersects(path2Rect) || path2Rect.contains(path1Rect) || path1Rect.contains(path2Rect))
+    {
+        if (path1Path.contains(path2Path) || path2Path.contains(path1Path) || path1Path.intersects(path2Path))
+        {
+            return true;
+        }
+    }
+
+    return false;
+}

src/app/puzzle/layout/vppiece.h

@@ -112,6 +112,10 @@ public:
     auto HasSuperpositionWithPieces() const -> bool;
     void SetHasSuperpositionWithPieces(bool newHasSuperpositionWithPieces);
 
+    auto StickyPosition(qreal &dx, qreal &dy) const -> bool;
+
+    static auto PathsSuperposition(const QVector<QPointF> &path1, const QVector<QPointF> &path2) -> bool;
+
 private:
     Q_DISABLE_COPY(VPPiece)
 

src/app/puzzle/layout/vpsheet.cpp

@@ -184,7 +184,7 @@ void VPSheet::ValidateSuperpositionOfPieces() const
 
             QVector<QPointF> path2 = p->GetMappedExternalContourPoints();
 
-            bool superposition = PathsSuperposition(path1, path2);
+            bool superposition = VPPiece::PathsSuperposition(path1, path2);
             if (superposition)
             {
                 hasSuperposition = superposition;
@@ -313,23 +313,3 @@ void VPSheet::CheckPiecePositionValidity(const VPPiecePtr &piece) const
         ValidateSuperpositionOfPieces();
     }
 }
-
-//---------------------------------------------------------------------------------------------------------------------
-auto VPSheet::PathsSuperposition(const QVector<QPointF> &path1, const QVector<QPointF> &path2) const -> bool
-{
-    const QRectF path1Rect = VLayoutPiece::BoundingRect(path1);
-    const QPainterPath path1Path = VAbstractPiece::PainterPath(path1);
-
-    const QRectF path2Rect = VLayoutPiece::BoundingRect(path2);
-    const QPainterPath path2Path = VAbstractPiece::PainterPath(path2);
-
-    if (path1Rect.intersects(path2Rect) || path2Rect.contains(path1Rect) || path1Rect.contains(path2Rect))
-    {
-        if (path1Path.contains(path2Path) || path2Path.contains(path1Path) || path1Path.intersects(path2Path))
-        {
-            return true;
-        }
-    }
-
-    return false;
-}

src/app/puzzle/layout/vpsheet.h

@@ -112,7 +112,7 @@ private:
 
     VPTransformationOrigon m_transformationOrigin{};
 
-    auto PathsSuperposition(const QVector<QPointF> &path1, const QVector<QPointF> &path2) const -> bool;
+
 };
 
 Q_DECLARE_METATYPE(VPSheetPtr)

src/app/puzzle/scene/vpgraphicspiece.cpp

@@ -94,6 +94,7 @@ auto VPGraphicsPiece::boundingRect() const -> QRectF
     shape.addPath(m_internalPaths);
     shape.addPath(m_passmarks);
     shape.addPath(m_placeLabels);
+    shape.addPath(m_stickyPath);
 
     constexpr qreal halfPenWidth = penWidth/2.;
 
@@ -136,6 +137,7 @@ void VPGraphicsPiece::mousePressEvent(QGraphicsSceneMouseEvent *event)
 
         m_moveStartPoint = event->pos();
         emit HideTransformationHandles(true);
+        m_hasStickyPosition = false;
     }
 }
 
@@ -161,7 +163,26 @@ void VPGraphicsPiece::mouseReleaseEvent(QGraphicsSceneMouseEvent *event)
     {
         setCursor(Qt::OpenHandCursor);
         emit HideTransformationHandles(false);
+
+        VPPiecePtr piece = m_piece.toStrongRef();
+        if (not piece.isNull())
+        {
+            VPLayoutPtr layout = piece->Layout();
+            if (not layout.isNull())
+            {
+                if (layout->LayoutSettings().GetStickyEdges() && m_hasStickyPosition)
+                {
+                    auto *command = new VPUndoPieceMove(piece, m_stickyTranslateX, m_stickyTranslateY,
+                                                        allowChangeMerge);
+                    layout->UndoStack()->push(command);
+
+                    SetStickyPoints(QVector<QPointF>());
+                }
+            }
+        }
+
         allowChangeMerge = false;
+        m_hasStickyPosition = false;
     }
 }
 
@@ -218,6 +239,15 @@ void VPGraphicsPiece::contextMenuEvent(QGraphicsSceneContextMenuEvent *event)
     }
 }
 
+//---------------------------------------------------------------------------------------------------------------------
+void VPGraphicsPiece::SetStickyPoints(const QVector<QPointF> &newStickyPoint)
+{
+    m_stickyPoints = newStickyPoint;
+
+    prepareGeometryChange();
+    PaintPiece(); // refresh shapes
+}
+
 //---------------------------------------------------------------------------------------------------------------------
 void VPGraphicsPiece::PaintPieceLabel(const QVector<QPointF> &labelShape, const VTextManager &tm, QPainter *painter)
 {
@@ -329,6 +359,7 @@ void VPGraphicsPiece::PaintPiece(QPainter *painter)
     m_internalPaths = QPainterPath();
     m_passmarks = QPainterPath();
     m_placeLabels = QPainterPath();
+    m_stickyPath = QPainterPath();
 
     VPPiecePtr piece = m_piece.toStrongRef();
     if (piece.isNull())
@@ -457,6 +488,29 @@ void VPGraphicsPiece::PaintPiece(QPainter *painter)
 
     PaintPieceLabel(piece->GetPieceLabelRect(), piece->GetPieceLabelData(), painter);
     PaintPieceLabel(piece->GetPatternLabelRect(), piece->GetPatternLabelData(), painter);
+
+    if (not m_stickyPoints.isEmpty())
+    {
+        m_stickyPath.moveTo(m_stickyPoints.first());
+        for (int i = 1; i < m_stickyPoints.size(); i++)
+        {
+            m_stickyPath.lineTo(m_stickyPoints.at(i));
+        }
+
+        if (painter != nullptr)
+        {
+            painter->save();
+            painter->setBrush(QBrush(Qt::BDiagPattern));
+
+            QPen pen = painter->pen();
+            pen.setStyle(Qt::DashLine);
+            pen.setColor(mainColor);
+            painter->setPen(pen);
+
+            painter->drawPath(m_stickyPath);
+            painter->restore();
+        }
+    }
 }
 
 //---------------------------------------------------------------------------------------------------------------------
@@ -497,8 +551,28 @@ void VPGraphicsPiece::GroupMove(const QPointF &pos)
 
     if (pieces.size() == 1)
     {
-        auto *command = new VPUndoPieceMove(pieces.first(), newPos.x(), newPos.y(), allowChangeMerge);
+        VPPiecePtr p = pieces.first();
+        auto *command = new VPUndoPieceMove(piece, newPos.x(), newPos.y(), allowChangeMerge);
         layout->UndoStack()->push(command);
+
+        if (layout->LayoutSettings().GetStickyEdges())
+        {
+            QVector<QPointF> path;
+            if (not p.isNull() && p->StickyPosition(m_stickyTranslateX, m_stickyTranslateY))
+            {
+                path = p->GetMappedExternalContourPoints();
+                QTransform m;
+                m.translate(m_stickyTranslateX, m_stickyTranslateY);
+                path = m.map(path);
+                m_hasStickyPosition = true;
+            }
+            else
+            {
+                m_hasStickyPosition = false;
+            }
+
+            SetStickyPoints(path);
+        }
     }
     else if (pieces.size() > 1)
     {

src/app/puzzle/scene/vpgraphicspiece.h

@@ -53,6 +53,8 @@ public:
     virtual int type() const override {return Type;}
     enum { Type = UserType + static_cast<int>(PGraphicsItem::Piece)};
 
+    void SetStickyPoints(const QVector<QPointF> &newStickyPoint);
+
 signals:
     void HideTransformationHandles(bool hide);
     void PieceTransformationChanged();
@@ -91,6 +93,13 @@ private:
 
     bool allowChangeMerge{false};
 
+    QVector<QPointF> m_stickyPoints{};
+    QPainterPath m_stickyPath{};
+
+    bool m_hasStickyPosition{false};
+    qreal m_stickyTranslateX{0};
+    qreal m_stickyTranslateY{0};
+
     void PaintPieceLabel(const QVector<QPointF> &labelShape, const VTextManager &tm, QPainter *painter=nullptr);
     void PaintPiece(QPainter *painter=nullptr);
 

src/app/puzzle/scene/vpmaingraphicsview.cpp

@@ -302,7 +302,7 @@ void VPMainGraphicsView::keyPressEvent(QKeyEvent *event)
         }
         else
         {
-            TranslatePiecesOn(0, 1);
+            TranslatePiecesOn(0, -1);
         }
     }
     else if (event->key() == Qt::Key_Down)
@@ -360,7 +360,48 @@ void VPMainGraphicsView::keyReleaseEvent(QKeyEvent *event)
     {
         if (not event->isAutoRepeat())
         {
+            if (m_hasStickyPosition && not m_graphicsPieces.isEmpty())
+            {
+                VPPiecePtr piece = m_graphicsPieces.first()->GetPiece();
+                if (not piece.isNull())
+                {
+                    VPLayoutPtr layout = piece->Layout();
+                    if (not layout.isNull() && layout->LayoutSettings().GetStickyEdges())
+                    {
+                        auto PreparePieces = [layout]()
+                        {
+                            QList<VPPiecePtr> pieces;
+                            VPSheetPtr sheet = layout->GetFocusedSheet();
+                            if (not sheet.isNull())
+                            {
+                                pieces = sheet->GetSelectedPieces();
+                            }
+
+                            return pieces;
+                        };
+
+                        QList<VPPiecePtr> pieces = PreparePieces();
+                        if (pieces.size() == 1)
+                        {
+                            VPPiecePtr p = pieces.first();
+
+                            auto *command = new VPUndoPieceMove(p, m_stickyTranslateX, m_stickyTranslateY,
+                                                                m_allowChangeMerge);
+                            layout->UndoStack()->push(command);
+
+                            VPGraphicsPiece * gPiece = ScenePiece(p);
+                            if (gPiece != nullptr)
+                            {
+                                gPiece->SetStickyPoints(QVector<QPointF>());
+                            }
+                        }
+                    }
+
+                }
+            }
+
             m_allowChangeMerge = false;
+            m_hasStickyPosition = false;
         }
     }
 
@@ -632,8 +673,32 @@ void VPMainGraphicsView::TranslatePiecesOn(qreal dx, qreal dy)
     QList<VPPiecePtr> pieces = PreparePieces();
     if (pieces.size() == 1)
     {
-        auto *command = new VPUndoPieceMove(pieces.first(), dx, dy, m_allowChangeMerge);
+        VPPiecePtr p = pieces.first();
+        auto *command = new VPUndoPieceMove(p, dx, dy, m_allowChangeMerge);
         layout->UndoStack()->push(command);
+
+        if (layout->LayoutSettings().GetStickyEdges())
+        {
+            QVector<QPointF> path;
+            if (not p.isNull() && p->StickyPosition(m_stickyTranslateX, m_stickyTranslateY))
+            {
+                path = p->GetMappedExternalContourPoints();
+                QTransform m;
+                m.translate(m_stickyTranslateX, m_stickyTranslateY);
+                path = m.map(path);
+                m_hasStickyPosition = true;
+            }
+            else
+            {
+                m_hasStickyPosition = false;
+            }
+
+            VPGraphicsPiece *gPiece = ScenePiece(p);
+            if (gPiece != nullptr)
+            {
+                gPiece->SetStickyPoints(path);
+            }
+        }
     }
     else if (pieces.size() > 1)
     {
@@ -645,7 +710,7 @@ void VPMainGraphicsView::TranslatePiecesOn(qreal dx, qreal dy)
 }
 
 //---------------------------------------------------------------------------------------------------------------------
-void VPMainGraphicsView::on_PieceSheetChanged(const VPPiecePtr &piece)
+auto VPMainGraphicsView::ScenePiece(const VPPiecePtr &piece) const -> VPGraphicsPiece *
 {
     VPGraphicsPiece *_graphicsPiece = nullptr;
     for(auto *graphicPiece : m_graphicsPieces)
@@ -656,6 +721,14 @@ void VPMainGraphicsView::on_PieceSheetChanged(const VPPiecePtr &piece)
         }
     }
 
+    return _graphicsPiece;
+}
+
+//---------------------------------------------------------------------------------------------------------------------
+void VPMainGraphicsView::on_PieceSheetChanged(const VPPiecePtr &piece)
+{
+    VPGraphicsPiece *graphicsPiece = ScenePiece(piece);
+
     VPLayoutPtr layout = piece->Layout();
     if (layout.isNull())
     {
@@ -665,22 +738,22 @@ void VPMainGraphicsView::on_PieceSheetChanged(const VPPiecePtr &piece)
     if (piece->Sheet().isNull() || piece->Sheet() == layout->GetTrashSheet() ||
             piece->Sheet() != layout->GetFocusedSheet()) // remove
     {
-        if (_graphicsPiece != nullptr)
+        if (graphicsPiece != nullptr)
         {
-            scene()->removeItem(_graphicsPiece);
-            m_graphicsPieces.removeAll(_graphicsPiece);
-            delete _graphicsPiece;
+            scene()->removeItem(graphicsPiece);
+            m_graphicsPieces.removeAll(graphicsPiece);
+            delete graphicsPiece;
         }
     }
     else // add
     {
-        if(_graphicsPiece == nullptr)
+        if(graphicsPiece == nullptr)
         {
-            _graphicsPiece = new VPGraphicsPiece(piece);
-            m_graphicsPieces.append(_graphicsPiece);
-            ConnectPiece(_graphicsPiece);
+            graphicsPiece = new VPGraphicsPiece(piece);
+            m_graphicsPieces.append(graphicsPiece);
+            ConnectPiece(graphicsPiece);
         }
-        scene()->addItem(_graphicsPiece);
+        scene()->addItem(graphicsPiece);
     }
 
     VMainGraphicsView::NewSceneRect(scene(), this);

src/app/puzzle/scene/vpmaingraphicsview.h

@@ -126,11 +126,16 @@ private:
 
     qreal m_rotationSum{0};
 
+    bool m_hasStickyPosition{false};
+    qreal m_stickyTranslateX{0};
+    qreal m_stickyTranslateY{0};
+
     void ConnectPiece(VPGraphicsPiece *piece);
 
     void RotatePiecesByAngle(qreal angle);
     void TranslatePiecesOn(qreal dx, qreal dy);
 
+    auto ScenePiece(const VPPiecePtr &piece) const -> VPGraphicsPiece *;
 };
 
 #endif // VPMAINGRAPHICSVIEW_H

src/app/puzzle/vpmainwindow.cpp

@@ -909,7 +909,6 @@ void VPMainWindow::InitPropertyTabLayout()
         {
             m_layout->LayoutSettings().SetPiecesGapConverted(d);
             LayoutWasSaved(false);
-            // TODO update the QGraphicView
         }
     });
 
@@ -2539,6 +2538,19 @@ void VPMainWindow::on_ApplyPieceTransformation()
 
                         auto *command = new VPUndoPieceMove(piece, pieceDx, pieceDy);
                         m_layout->UndoStack()->push(command);
+
+                        if (m_layout->LayoutSettings().GetStickyEdges())
+                        {
+                            qreal stickyTranslateX = 0;
+                            qreal stickyTranslateY = 0;
+                            if (piece->StickyPosition(stickyTranslateX, stickyTranslateY))
+                            {
+                                bool allowMerge = selectedPieces.size() == 1;
+                                auto *stickyCommand = new VPUndoPieceMove(piece, stickyTranslateX, stickyTranslateY,
+                                                                          allowMerge);
+                                m_layout->UndoStack()->push(stickyCommand);
+                            }
+                        }
                     }
                 }
 

src/app/puzzle/xml/vplayoutfilereader.cpp

@@ -297,7 +297,7 @@ void VPLayoutFileReader::ReadControl(const VPLayoutPtr &layout)
                 ReadAttributeBool(attribs, ML::AttrWarningSuperposition, trueStr));
     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().SetPiecesGap(qMax(ReadAttributeDouble(attribs, ML::AttrPiecesGap, QChar('0')), 0.0));
     layout->LayoutSettings().SetFollowGrainline(ReadAttributeBool(attribs, ML::AttrFollowGrainline, falseStr));
 
     readElementText();