KoPathTool.cpp

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/* This file is part of the KDE project
 * SPDX-FileCopyrightText: 2006-2012 Jan Hambrecht <jaham@gmx.net>
 * SPDX-FileCopyrightText: 2006, 2007 Thorsten Zachmann <zachmann@kde.org>
 * SPDX-FileCopyrightText: 2007, 2010 Thomas Zander <zander@kde.org>
 * SPDX-FileCopyrightText: 2007 Boudewijn Rempt <boud@valdyas.org>
 *
 * SPDX-License-Identifier: LGPL-2.0-or-later
 */
 
#include "KoPathTool.h"
#include "KoCanvasBase.h"
#include "KoDocumentResourceManager.h"
#include "KoParameterChangeStrategy.h"
#include "KoParameterShape.h"
#include "KoPathPoint.h"
#include "KoPathPointRubberSelectStrategy.h"
#include "KoPathSegmentChangeStrategy.h"
#include "KoPathShape_p.h"
#include "KoPathToolHandle.h"
#include "KoPointerEvent.h"
#include "KoSelectedShapesProxy.h"
#include "KoSelection.h"
#include "KoShapeController.h"
#include "KoShapeGroup.h"
#include "KoShapeManager.h"
#include "KoSnapGuide.h"
#include "KoToolBase_p.h"
#include "KoToolManager.h"
#include "KoViewConverter.h"
#include "PathToolOptionWidget.h"
#include "commands/KoParameterToPathCommand.h"
#include "commands/KoPathBreakAtPointCommand.h"
#include "commands/KoPathPointInsertCommand.h"
#include "commands/KoPathPointRemoveCommand.h"
#include "commands/KoPathPointTypeCommand.h"
#include "commands/KoPathSegmentBreakCommand.h"
#include "commands/KoPathSegmentTypeCommand.h"
#include "commands/KoSubpathJoinCommand.h"
#include "kis_action_registry.h"
#include "kis_command_utils.h"
#include "kis_pointer_utils.h"
#include <KisHandlePainterHelper.h>
#include <KoShapeStrokeModel.h>
#include <KoColorDisplayRendererInterface.h>
#include <commands/KoKeepShapesSelectedCommand.h>
#include <commands/KoMultiPathPointJoinCommand.h>
#include <commands/KoMultiPathPointMergeCommand.h>
#include <commands/KoShapeGroupCommand.h>
#include <text/KoSvgTextShape.h>
 
#include <KoIcon.h>
 
#include <QMenu>
#include <QAction>
#include <FlakeDebug.h>
#include <klocalizedstring.h>
#include <QPainter>
#include <QPainterPath>
#include <QBitmap>
#include <QTabWidget>
 
#include <math.h>
 
// helper function to calculate the squared distance between two points
qreal squaredDistance(const QPointF& p1, const QPointF &p2)
{
    qreal dx = p1.x()-p2.x();
    qreal dy = p1.y()-p2.y();
    return dx*dx + dy*dy;
}
 
struct KoPathTool::PathSegment {
    PathSegment()
        : path(0), segmentStart(0), positionOnSegment(0)
    {
    }
 
    bool isValid() {
        return  path && segmentStart;
    }
 
    KoPathShape *path;
    KoPathPoint *segmentStart;
    qreal positionOnSegment;
};
 
KoPathTool::KoPathTool(KoCanvasBase *canvas)
    : KoToolBase(canvas)
    , m_pointSelection(this)
    , m_textOutlineHelper(new KoSvgTextShapeOutlineHelper(canvas))
{
    m_actionPathPointCorner = action("pathpoint-corner");
    m_actionPathPointSmooth = action("pathpoint-smooth");
    m_actionPathPointSymmetric = action("pathpoint-symmetric");
    m_actionCurvePoint = action("pathpoint-curve");
    m_actionLinePoint = action("pathpoint-line");
    m_actionLineSegment = action("pathsegment-line");
    m_actionCurveSegment = action("pathsegment-curve");
    m_actionAddPoint = action("pathpoint-insert");
    m_actionRemovePoint = action("pathpoint-remove");
    m_actionBreakPoint = action("path-break-point");
    m_actionBreakSegment = action("path-break-segment");
    m_actionBreakSelection = action("path-break-selection");
    m_actionJoinSegment = action("pathpoint-join");
    m_actionMergePoints = action("pathpoint-merge");
    m_actionConvertToPath = action("convert-to-path");
 
    m_contextMenu.reset(new QMenu());
    m_textOutlineHelper->setDrawBoundingRect(true);
    m_textOutlineHelper->setDrawShapeOutlines(false);
 
    m_selectCursor = QCursor(QIcon(":/cursor-needle.svg").pixmap(32), 0, 0);
    m_moveCursor = QCursor(QIcon(":/cursor-needle-move.svg").pixmap(32), 0, 0);
 
    connect(&m_pointSelection, SIGNAL(selectionChanged()), SLOT(repaintDecorations()));
}
 
KoPathTool::~KoPathTool()
{
}
 
QList<QPointer<QWidget> >  KoPathTool::createOptionWidgets()
{
    QList<QPointer<QWidget> > list;
 
    PathToolOptionWidget * toolOptions = new PathToolOptionWidget(this);
    connect(this, SIGNAL(typeChanged(int)), toolOptions, SLOT(setSelectionType(int)));
    connect(this, SIGNAL(singleShapeChanged(KoPathShape*)), toolOptions, SLOT(setCurrentShape(KoPathShape*)));
    connect(toolOptions, SIGNAL(sigRequestUpdateActions()), this, SLOT(updateActions()));
    updateOptionsWidget();
    toolOptions->setWindowTitle(i18n("Edit Shape"));
    list.append(toolOptions);
 
    return list;
}
 
void KoPathTool::pointTypeChangedCorner() {
    pointTypeChanged(KoPathPointTypeCommand::Corner);
}
void KoPathTool::pointTypeChangedSmooth() {
    pointTypeChanged(KoPathPointTypeCommand::Smooth);
}
void KoPathTool::pointTypeChangedSymmetric() {
    pointTypeChanged(KoPathPointTypeCommand::Symmetric);
}
 
void KoPathTool::pointTypeChanged(KoPathPointTypeCommand::PointType type)
{
    Q_D(KoToolBase);
    if (m_pointSelection.hasSelection()) {
        QList<KoPathPointData> selectedPoints = m_pointSelection.selectedPointsData();
 
        KUndo2Command *initialConversionCommand = createPointToCurveCommand(selectedPoints);
 
        // conversion should happen before the c-tor
        // of KoPathPointTypeCommand is executed!
        if (initialConversionCommand) {
            initialConversionCommand->redo();
        }
 
        KUndo2Command *command =
                new KoPathPointTypeCommand(selectedPoints, type);
 
        if (initialConversionCommand) {
            using namespace KisCommandUtils;
            CompositeCommand *parent = new CompositeCommand();
            parent->setText(command->text());
            parent->addCommand(new SkipFirstRedoWrapper(initialConversionCommand));
            parent->addCommand(command);
            command = parent;
        }
 
        d->canvas->addCommand(command);
    }
}
 
void KoPathTool::insertPoints()
{
    Q_D(KoToolBase);
    QList<KoPathPointData> segments(m_pointSelection.selectedSegmentsData());
    if (segments.size() == 1) {
        qreal positionInSegment = 0.5;
        if (m_activeSegment && m_activeSegment->isValid()) {
            positionInSegment = m_activeSegment->positionOnSegment;
        }
 
        KoPathPointInsertCommand *cmd = new KoPathPointInsertCommand(segments, positionInSegment);
        d->canvas->addCommand(cmd);
 
        // TODO: this construction is dangerous. The canvas can remove the command right after
        //       it has been added to it!
        m_pointSelection.clear();
        foreach (KoPathPoint * p, cmd->insertedPoints()) {
            m_pointSelection.add(p, false);
        }
    }
}
 
void KoPathTool::removePoints()
{
    Q_D(KoToolBase);
    if (m_pointSelection.size() > 0) {
        KUndo2Command *cmd = KoPathPointRemoveCommand::createCommand(m_pointSelection.selectedPointsData(), d->canvas->shapeController());
        PointHandle *pointHandle = dynamic_cast<PointHandle*>(m_activeHandle.data());
        if (pointHandle && m_pointSelection.contains(pointHandle->activePoint())) {
            m_activeHandle.reset();
        }
        clearActivePointSelectionReferences();
        d->canvas->addCommand(cmd);
    }
}
 
void KoPathTool::pointToLine()
{
    Q_D(KoToolBase);
    if (m_pointSelection.hasSelection()) {
        QList<KoPathPointData> selectedPoints = m_pointSelection.selectedPointsData();
        QList<KoPathPointData> pointToChange;
 
        QList<KoPathPointData>::const_iterator it(selectedPoints.constBegin());
        for (; it != selectedPoints.constEnd(); ++it) {
            KoPathPoint *point = it->pathShape->pointByIndex(it->pointIndex);
            if (point && (point->activeControlPoint1() || point->activeControlPoint2()))
                pointToChange.append(*it);
        }
 
        if (! pointToChange.isEmpty()) {
            d->canvas->addCommand(new KoPathPointTypeCommand(pointToChange, KoPathPointTypeCommand::Line));
        }
    }
}
 
void KoPathTool::pointToCurve()
{
    Q_D(KoToolBase);
    if (m_pointSelection.hasSelection()) {
        QList<KoPathPointData> selectedPoints = m_pointSelection.selectedPointsData();
 
        KUndo2Command *command = createPointToCurveCommand(selectedPoints);
 
        if (command) {
            d->canvas->addCommand(command);
        }
    }
}
 
KUndo2Command* KoPathTool::createPointToCurveCommand(const QList<KoPathPointData> &points)
{
    KUndo2Command *command = 0;
    QList<KoPathPointData> pointToChange;
 
    QList<KoPathPointData>::const_iterator it(points.constBegin());
    for (; it != points.constEnd(); ++it) {
        KoPathPoint *point = it->pathShape->pointByIndex(it->pointIndex);
        if (point && (! point->activeControlPoint1() || ! point->activeControlPoint2()))
            pointToChange.append(*it);
    }
 
    if (!pointToChange.isEmpty()) {
        command = new KoPathPointTypeCommand(pointToChange, KoPathPointTypeCommand::Curve);
    }
 
    return command;
}
 
void KoPathTool::segmentToLine()
{
    Q_D(KoToolBase);
    if (m_pointSelection.size() > 1) {
        QList<KoPathPointData> segments(m_pointSelection.selectedSegmentsData());
        if (segments.size() > 0) {
            d->canvas->addCommand(new KoPathSegmentTypeCommand(segments, KoPathSegmentTypeCommand::Line));
        }
    }
}
 
void KoPathTool::segmentToCurve()
{
    Q_D(KoToolBase);
    if (m_pointSelection.size() > 1) {
        QList<KoPathPointData> segments(m_pointSelection.selectedSegmentsData());
        if (segments.size() > 0) {
            d->canvas->addCommand(new KoPathSegmentTypeCommand(segments, KoPathSegmentTypeCommand::Curve));
        }
    }
}
 
void KoPathTool::convertToPath()
{
    Q_D(KoToolBase);
 
    KoSelection *selection = canvas()->selectedShapesProxy()->selection();
 
    QList<KoParameterShape*> parameterShapes;
 
    Q_FOREACH (KoShape *shape, m_pointSelection.selectedShapes()) {
        KoParameterShape * parametric = dynamic_cast<KoParameterShape*>(shape);
        if (parametric && parametric->isParametricShape()) {
            parameterShapes.append(parametric);
        }
    }
 
    if (!parameterShapes.isEmpty()) {
        d->canvas->addCommand(new KoParameterToPathCommand(parameterShapes));
    }
 
    QList<KoSvgTextShape*> textShapes;
    Q_FOREACH (KoShape *shape, selection->selectedEditableShapes()) {
        if (KoSvgTextShape *text = dynamic_cast<KoSvgTextShape*>(shape)) {
            textShapes.append(text);
        }
    }
 
    if (!textShapes.isEmpty()) {
        KUndo2Command *cmd = new KUndo2Command(kundo2_i18n("Convert to Path")); // TODO: reuse the text from KoParameterToPathCommand
        const QList<KoShape*> oldSelectedShapes = implicitCastList<KoShape*>(textShapes);
 
 
        new KoKeepShapesSelectedCommand(oldSelectedShapes, {}, canvas()->selectedShapesProxy(),
                                        KisCommandUtils::FlipFlopCommand::State::INITIALIZING, cmd);
 
        QList<KoShape*> newSelectedShapes;
        Q_FOREACH (KoSvgTextShape *shape, textShapes) {
            KoShape *outlineShape = shape->textOutline();
 
            KoShapeContainer *parent = shape->parent();
            canvas()->shapeController()->addShapeDirect(outlineShape, parent, cmd);
 
            newSelectedShapes << outlineShape;
        }
 
        canvas()->shapeController()->removeShapes(oldSelectedShapes, cmd);
 
        new KoKeepShapesSelectedCommand({}, newSelectedShapes, canvas()->selectedShapesProxy(),
                                        KisCommandUtils::FlipFlopCommand::State::FINALIZING, cmd);
 
        canvas()->addCommand(cmd);
    }
 
    updateOptionsWidget();
}
 
namespace {
bool checkCanJoinToPoints(const KoPathPointData & pd1, const KoPathPointData & pd2)
{
    const KoPathPointIndex & index1 = pd1.pointIndex;
    const KoPathPointIndex & index2 = pd2.pointIndex;
 
    KoPathShape *path1 = pd1.pathShape;
    KoPathShape *path2 = pd2.pathShape;
 
    // check if subpaths are already closed
    if (path1->isClosedSubpath(index1.first) || path2->isClosedSubpath(index2.first))
        return false;
 
    // check if first point is an endpoint
    if (index1.second != 0 && index1.second != path1->subpathPointCount(index1.first)-1)
        return false;
 
    // check if second point is an endpoint
    if (index2.second != 0 && index2.second != path2->subpathPointCount(index2.first)-1)
        return false;
 
    return true;
}
}
 
void KoPathTool::mergePointsImpl(bool doJoin)
{
    Q_D(KoToolBase);
 
    if (m_pointSelection.size() != 2)
        return;
 
    QList<KoPathPointData> pointData = m_pointSelection.selectedPointsData();
    if (pointData.size() != 2) return;
 
    const KoPathPointData & pd1 = pointData.at(0);
    const KoPathPointData & pd2 = pointData.at(1);
 
    if (!checkCanJoinToPoints(pd1, pd2)) {
        return;
    }
 
    clearActivePointSelectionReferences();
 
    KUndo2Command *cmd = 0;
 
    if (doJoin) {
        cmd = new KoMultiPathPointJoinCommand(pd1, pd2, d->canvas->shapeController()->documentBase(), d->canvas->shapeManager()->selection());
    } else {
        cmd = new KoMultiPathPointMergeCommand(pd1, pd2, d->canvas->shapeController()->documentBase(), d->canvas->shapeManager()->selection());
    }
    d->canvas->addCommand(cmd);
}
 
void KoPathTool::joinPoints()
{
    mergePointsImpl(true);
}
 
void KoPathTool::mergePoints()
{
    mergePointsImpl(false);
}
 
void KoPathTool::breakAtPoint()
{
    Q_D(KoToolBase);
    if (m_pointSelection.hasSelection()) {
        d->canvas->addCommand(new KoPathBreakAtPointCommand(m_pointSelection.selectedPointsData()));
    }
}
 
void KoPathTool::breakAtSelection()
{
    Q_D(KoToolBase);
 
    if (m_pointSelection.objectCount() == 1 && m_pointSelection.size() == 2) {
        QList<KoPathPointData> segments(m_pointSelection.selectedSegmentsData());
        if (segments.size() == 1) {
            d->canvas->addCommand(new KoPathSegmentBreakCommand(segments.at(0)));
        }
    } else if (m_pointSelection.hasSelection()) {
        d->canvas->addCommand(new KoPathBreakAtPointCommand(m_pointSelection.selectedPointsData()));
    }
}
 
void KoPathTool::breakAtSegment()
{
    Q_D(KoToolBase);
    // only try to break a segment when 2 points of the same object are selected
    if (m_pointSelection.objectCount() == 1 && m_pointSelection.size() == 2) {
        QList<KoPathPointData> segments(m_pointSelection.selectedSegmentsData());
        if (segments.size() == 1) {
            d->canvas->addCommand(new KoPathSegmentBreakCommand(segments.at(0)));
        }
    }
}
 
void KoPathTool::paint(QPainter &painter, const KoViewConverter &converter)
{
    Q_D(KoToolBase);
    m_textOutlineHelper->setDecorationThickness(decorationThickness());
    m_textOutlineHelper->setHandleRadius(handleRadius());
    m_textOutlineHelper->paint(&painter, converter);
 
    const KisHandlePalette palette = canvas()->displayRendererInterface()->handlePaletteForDisplayColorSpace();
 
    Q_FOREACH (KoPathShape *shape, m_pointSelection.selectedShapes()) {
        KisHandlePainterHelper helper =
                KoShape::createHandlePainterHelperView(&painter, shape, converter, handleRadius(), decorationThickness());
        helper.setHandleStyle(KisHandleStyle::primarySelection(palette));
 
        KoParameterShape * parameterShape = dynamic_cast<KoParameterShape*>(shape);
        if (parameterShape && parameterShape->isParametricShape()) {
            parameterShape->paintHandles(helper);
        } else {
            shape->paintPoints(helper);
        }
 
        if (!shape->stroke() || !shape->stroke()->isVisible()) {
            helper.setHandleStyle(KisHandleStyle::secondarySelection(palette));
            helper.drawPath(shape->outline());
        }
    }
 
    if (m_currentStrategy) {
        painter.save();
        m_currentStrategy->paint(painter, converter, canvas()->displayRendererInterface());
        painter.restore();
    }
 
    m_pointSelection.paint(painter, converter, handleRadius(), canvas()->displayRendererInterface());
 
    if (m_activeHandle) {
        if (m_activeHandle->check(m_pointSelection.selectedShapes())) {
            m_activeHandle->paint(painter, converter, handleRadius(), decorationThickness(), canvas()->displayRendererInterface());
        } else {
            m_activeHandle.reset();
        }
    } else if (m_activeSegment && m_activeSegment->isValid()) {
 
        KoPathShape *shape = m_activeSegment->path;
 
        // if the stroke is invisible, then we already painted the outline of the shape!
        if (shape->stroke() && shape->stroke()->isVisible()) {
            KoPathPointIndex index = shape->pathPointIndex(m_activeSegment->segmentStart);
            KoPathSegment segment = shape->segmentByIndex(index).toCubic();
 
            KIS_SAFE_ASSERT_RECOVER_RETURN(segment.isValid());
 
            KisHandlePainterHelper helper =
                    KoShape::createHandlePainterHelperView(&painter, shape, converter, handleRadius(), decorationThickness());
            helper.setHandleStyle(KisHandleStyle::secondarySelection(palette));
 
            QPainterPath path;
            path.moveTo(segment.first()->point());
            path.cubicTo(segment.first()->controlPoint2(),
                         segment.second()->controlPoint1(),
                         segment.second()->point());
 
            helper.drawPath(path);
        }
    }
 
 
 
    if (m_currentStrategy) {
        painter.save();
        painter.setTransform(converter.documentToView(), true);
        d->canvas->snapGuide()->paint(painter, converter, canvas()->displayRendererInterface());
        painter.restore();
    }
}
 
QRectF KoPathTool::decorationsRect() const
{
    const_cast<KoPathToolSelection&>(m_pointSelection).update();
 
    QRectF newDecorationsRect;
 
    Q_FOREACH (KoShape *shape, m_pointSelection.selectedShapes()) {
        newDecorationsRect |= kisGrowRect(shape->boundingRect(), handleDocRadius());
    }
 
    Q_FOREACH(const KoPathPoint *point, m_pointSelection.selectedPoints()) {
        newDecorationsRect |= kisGrowRect(point->boundingRect(false), handleDocRadius());
    }
 
    if (m_activeHandle) {
        newDecorationsRect |= kisGrowRect(m_activeHandle->boundingRect(), handleDocRadius());
    }
 
    if (m_activeSegment) {
        KoPathPointIndex index = m_activeSegment->path->pathPointIndex(m_activeSegment->segmentStart);
        KoPathSegment segment = m_activeSegment->path->segmentByIndex(index);
 
        QRectF rect = segment.boundingRect();
        rect = m_activeSegment->path->shapeToDocument(rect);
 
        newDecorationsRect |= kisGrowRect(rect, handleDocRadius());
    }
 
    newDecorationsRect |= m_textOutlineHelper->decorationRect();
 
    return newDecorationsRect;
}
 
void KoPathTool::repaintDecorations()
{
    KoToolBase::repaintDecorations();
    updateOptionsWidget();
}
 
void KoPathTool::mousePressEvent(KoPointerEvent *event)
{
    // When using touch drawing, we only ever receive move events after the
    // finger has pressed down. We have to issue an artificial move here so that
    // the tool's state is updated properly to handle the press.
    if (event->isTouchEvent()) {
        mouseMoveEvent(event);
    }
 
    if (KoSvgTextShape *shape = m_textOutlineHelper->contourModeButtonHovered(event->point)) {
        m_textOutlineHelper->toggleTextContourMode(shape);
        event->accept();
    }
    // we are moving if we hit a point and use the left mouse button
    if (m_activeHandle) {
        m_currentStrategy.reset(m_activeHandle->handleMousePress(event));
    } else {
 
        if (event->button() & Qt::LeftButton) {
 
            // check if we hit a path segment
            if (m_activeSegment && m_activeSegment->isValid()) {
 
                KoPathShape *shape = m_activeSegment->path;
                KoPathPointIndex index = shape->pathPointIndex(m_activeSegment->segmentStart);
                KoPathSegment segment = shape->segmentByIndex(index);
 
                m_pointSelection.add(segment.first(), !(event->modifiers() & Qt::ShiftModifier));
                m_pointSelection.add(segment.second(), false);
 
                KoPathPointData data(shape, index);
                m_currentStrategy.reset(new KoPathSegmentChangeStrategy(this, event->point, data, m_activeSegment->positionOnSegment));
            } else {
 
                KoShapeManager *shapeManager = canvas()->shapeManager();
                KoSelection *selection = shapeManager->selection();
                KoShape *shape = shapeManager->shapeAt(event->point, KoFlake::ShapeOnTop);
 
                if (shape && !selection->isSelected(shape)) {
 
                    if (!(event->modifiers() & Qt::ShiftModifier)) {
                        selection->deselectAll();
                    }
 
                    selection->select(shape);
                } else {
                    KIS_ASSERT_RECOVER_RETURN(m_currentStrategy == 0);
                    m_currentStrategy.reset(new KoPathPointRubberSelectStrategy(this, event->point));
                }
            }
        }
    }
}
 
void KoPathTool::mouseMoveEvent(KoPointerEvent *event)
{
    if (event->button() & Qt::RightButton)
        return;
 
    if (m_currentStrategy) {
        m_lastPoint = event->point;
        m_currentStrategy->handleMouseMove(event->point, event->modifiers());
 
        repaintDecorations();
 
        return;
    }
 
    if (m_activeSegment) {
        m_activeSegment.reset();
        repaintDecorations();
    }
 
    Q_FOREACH (KoPathShape *shape, m_pointSelection.selectedShapes()) {
        QRectF roi = shape->documentToShape(handleGrabRect(event->point));
        KoParameterShape * parameterShape = dynamic_cast<KoParameterShape*>(shape);
        if (parameterShape && parameterShape->isParametricShape()) {
            int handleId = parameterShape->handleIdAt(roi);
            if (handleId != -1) {
                useCursor(m_moveCursor);
                Q_EMIT statusTextChanged(i18n("Drag to move handle."));
 
                m_activeHandle.reset(new ParameterHandle(this, parameterShape, handleId));
                repaintDecorations();
                return;
            }
        } else {
            QList<KoPathPoint*> points = shape->pointsAt(roi, true);
            if (! points.empty()) {
                // find the nearest control point from all points within the roi
                KoPathPoint * bestPoint = 0;
                KoPathPoint::PointType bestPointType = KoPathPoint::Node;
                qreal minDistance = HUGE_VAL;
                Q_FOREACH (KoPathPoint *p, points) {
                    // the node point must be hit if the point is not selected yet
                    if (! m_pointSelection.contains(p) && ! roi.contains(p->point()))
                        continue;
 
                    // check for the control points first as otherwise it is no longer
                    // possible to change the control points when they are the same as the point
                    if (p->activeControlPoint1() && roi.contains(p->controlPoint1())) {
                        qreal dist = squaredDistance(roi.center(), p->controlPoint1());
                        if (dist < minDistance) {
                            bestPoint = p;
                            bestPointType = KoPathPoint::ControlPoint1;
                            minDistance = dist;
                        }
                    }
 
                    if (p->activeControlPoint2() && roi.contains(p->controlPoint2())) {
                        qreal dist = squaredDistance(roi.center(), p->controlPoint2());
                        if (dist < minDistance) {
                            bestPoint = p;
                            bestPointType = KoPathPoint::ControlPoint2;
                            minDistance = dist;
                        }
                    }
 
                    // check the node point at last
                    qreal dist = squaredDistance(roi.center(), p->point());
                    if (dist < minDistance) {
                        bestPoint = p;
                        bestPointType = KoPathPoint::Node;
                        minDistance = dist;
                    }
                }
 
                if (! bestPoint) {
                    repaintDecorations();
                    return;
                }
 
                useCursor(m_moveCursor);
                if (bestPointType == KoPathPoint::Node)
                    Q_EMIT statusTextChanged(i18n("Drag to move point. Shift click to change point type."));
                else
                    Q_EMIT statusTextChanged(i18n("Drag to move control point."));
 
                PointHandle *prev = dynamic_cast<PointHandle*>(m_activeHandle.data());
                if (prev && prev->activePoint() == bestPoint && prev->activePointType() == bestPointType)
                    return; // no change;
 
                m_activeHandle.reset(new PointHandle(this, bestPoint, bestPointType));
                repaintDecorations();
                return;
            }
        }
    }
 
    useCursor(m_selectCursor);
 
    if (m_activeHandle) {
        m_activeHandle.reset();
        repaintDecorations();
    }
 
    PathSegment *hoveredSegment = segmentAtPoint(event->point);
    if(hoveredSegment) {
        useCursor(Qt::PointingHandCursor);
        Q_EMIT statusTextChanged(i18n("Drag to change curve directly. Double click to insert new path point."));
        m_activeSegment.reset(hoveredSegment);
        repaintDecorations();
    } else {
        uint selectedPointCount = m_pointSelection.size();
        if (selectedPointCount == 0)
            Q_EMIT statusTextChanged(QString());
        else {
            if (!m_actionBreakSelection->shortcut().isEmpty()) {
                if (selectedPointCount == 1)
                    Q_EMIT statusTextChanged(i18nc("%1 is a shortcut to be pressed", "Press %1 to break path at selected point.", m_actionBreakSelection->shortcut().toString()));
                else
                    Q_EMIT statusTextChanged(i18nc("%1 is a shortcut to be pressed", "Press %1 to break path at selected segments.", m_actionBreakSelection->shortcut().toString()));
            } else {
                Q_EMIT statusTextChanged(QString());
            }
        }
    }
}
 
void KoPathTool::mouseReleaseEvent(KoPointerEvent *event)
{
    Q_D(KoToolBase);
    if (m_currentStrategy) {
        const bool hadNoSelection = !m_pointSelection.hasSelection();
        m_currentStrategy->finishInteraction(event->modifiers());
        KUndo2Command *command = m_currentStrategy->createCommand();
        if (command)
            d->canvas->addCommand(command);
        if (hadNoSelection && dynamic_cast<KoPathPointRubberSelectStrategy*>(m_currentStrategy.data())
                && !m_pointSelection.hasSelection()) {
            // the click didn't do anything at all. Allow it to be used by others.
            event->ignore();
        }
        m_currentStrategy.reset();
        repaintDecorations();
    }
}
 
void KoPathTool::keyPressEvent(QKeyEvent *event)
{
    if (m_currentStrategy) {
        switch (event->key()) {
        case Qt::Key_Control:
        case Qt::Key_Alt:
        case Qt::Key_Shift:
        case Qt::Key_Meta:
            if (! event->isAutoRepeat()) {
                m_currentStrategy->handleMouseMove(m_lastPoint, event->modifiers());
            }
            break;
        case Qt::Key_Escape:
            m_currentStrategy->cancelInteraction();
            m_currentStrategy.reset();
            break;
        default:
            event->ignore();
            return;
        }
    } else {
        switch (event->key()) {
#ifndef NDEBUG
//        case Qt::Key_D:
//            if (m_pointSelection.objectCount() == 1) {
//                QList<KoPathPointData> selectedPoints = m_pointSelection.selectedPointsData();
//                KoPathShapePrivate *p = static_cast<KoPathShapePrivate*>(selectedPoints[0].pathShape->priv());
//                p->debugPath();
//            }
//            break;
#endif
        default:
            event->ignore();
            return;
        }
    }
    event->accept();
}
 
void KoPathTool::keyReleaseEvent(QKeyEvent *event)
{
    if (m_currentStrategy) {
        switch (event->key()) {
        case Qt::Key_Control:
        case Qt::Key_Alt:
        case Qt::Key_Shift:
        case Qt::Key_Meta:
            if (! event->isAutoRepeat()) {
                m_currentStrategy->handleMouseMove(m_lastPoint, Qt::NoModifier);
            }
            break;
        default:
            break;
        }
    }
    event->accept();
}
 
void KoPathTool::mouseDoubleClickEvent(KoPointerEvent */*event*/)
{
    Q_D(KoToolBase);
    // check if we are doing something else at the moment
    if (m_currentStrategy) return;
 
    if (!m_activeHandle && m_activeSegment && m_activeSegment->isValid()) {
        QList<KoPathPointData> segments;
        segments.append(
                    KoPathPointData(m_activeSegment->path,
                                    m_activeSegment->path->pathPointIndex(m_activeSegment->segmentStart)));
 
        KoPathPointInsertCommand *cmd = new KoPathPointInsertCommand(segments, m_activeSegment->positionOnSegment);
        d->canvas->addCommand(cmd);
 
        m_pointSelection.clear();
        foreach (KoPathPoint * p, cmd->insertedPoints()) {
            m_pointSelection.add(p, false);
        }
        updateActions();
    } else if (!m_activeHandle && !m_activeSegment) {
        explicitUserStrokeEndRequest();
    }
}
 
KoPathTool::PathSegment* KoPathTool::segmentAtPoint(const QPointF &point)
{
    // the max allowed distance from a segment
    const QRectF grabRoi = handleGrabRect(point);
    std::unique_ptr<PathSegment> segment(new PathSegment);
 
    Q_FOREACH (KoPathShape *shape, m_pointSelection.selectedShapes()) {
        KoParameterShape * parameterShape = dynamic_cast<KoParameterShape*>(shape);
        if (parameterShape && parameterShape->isParametricShape())
            continue;
 
        const KoPathSegment s = shape->segmentAtPoint(point, grabRoi);
        if (s.isValid()) {
            segment->path = shape;
            segment->segmentStart = s.first();
            segment->positionOnSegment = s.nearestPoint(shape->documentToShape(point));
        }
    }
 
    if (!segment->isValid()) {
        segment.reset();
    }
 
    return segment.release();
}
 
void KoPathTool::activate(const QSet<KoShape*> &shapes)
{
    KoToolBase::activate(shapes);
 
    Q_D(KoToolBase);
 
    d->canvas->snapGuide()->reset();
 
    useCursor(m_selectCursor);
    m_canvasConnections.addConnection(d->canvas->selectedShapesProxy(), SIGNAL(selectionChanged()), this, SLOT(slotSelectionChanged()));
    m_canvasConnections.addConnection(d->canvas->selectedShapesProxy(), SIGNAL(selectionContentChanged()), this, SLOT(updateActions()));
 
    m_canvasConnections.addConnection(d->canvas->selectedShapesProxy(), SIGNAL(selectionChanged()), this, SLOT(repaintDecorations()));
    m_canvasConnections.addConnection(d->canvas->selectedShapesProxy(), SIGNAL(selectionContentChanged()), this, SLOT(repaintDecorations()));
    m_shapeFillResourceConnector.connectToCanvas(d->canvas);
    initializeWithShapes(QList<KoShape*>(shapes.begin(), shapes.end()));
    connect(m_actionCurvePoint, SIGNAL(triggered()), this, SLOT(pointToCurve()), Qt::UniqueConnection);
    connect(m_actionLinePoint, SIGNAL(triggered()), this, SLOT(pointToLine()), Qt::UniqueConnection);
    connect(m_actionLineSegment, SIGNAL(triggered()), this, SLOT(segmentToLine()), Qt::UniqueConnection);
    connect(m_actionCurveSegment, SIGNAL(triggered()), this, SLOT(segmentToCurve()), Qt::UniqueConnection);
    connect(m_actionAddPoint, SIGNAL(triggered()), this, SLOT(insertPoints()), Qt::UniqueConnection);
    connect(m_actionRemovePoint, SIGNAL(triggered()), this, SLOT(removePoints()), Qt::UniqueConnection);
    connect(m_actionBreakPoint, SIGNAL(triggered()), this, SLOT(breakAtPoint()), Qt::UniqueConnection);
    connect(m_actionBreakSegment, SIGNAL(triggered()), this, SLOT(breakAtSegment()), Qt::UniqueConnection);
    connect(m_actionBreakSelection, SIGNAL(triggered()), this, SLOT(breakAtSelection()), Qt::UniqueConnection);
    connect(m_actionJoinSegment, SIGNAL(triggered()), this, SLOT(joinPoints()), Qt::UniqueConnection);
    connect(m_actionMergePoints, SIGNAL(triggered()), this, SLOT(mergePoints()), Qt::UniqueConnection);
    connect(m_actionConvertToPath, SIGNAL(triggered()), this, SLOT(convertToPath()), Qt::UniqueConnection);
    connect(m_actionPathPointCorner, SIGNAL(triggered()), this, SLOT(pointTypeChangedCorner()), Qt::UniqueConnection);
    connect(m_actionPathPointSmooth, SIGNAL(triggered()), this, SLOT(pointTypeChangedSmooth()), Qt::UniqueConnection);
    connect(m_actionPathPointSymmetric, SIGNAL(triggered()), this, SLOT(pointTypeChangedSymmetric()), Qt::UniqueConnection);
    connect(&m_pointSelection, SIGNAL(selectionChanged()), this, SLOT(pointSelectionChanged()), Qt::UniqueConnection);
 
}
 
void KoPathTool::slotSelectionChanged()
{
    Q_D(KoToolBase);
    QList<KoShape*> shapes =
            d->canvas->selectedShapesProxy()->selection()->selectedEditableShapesAndDelegates();
 
    initializeWithShapes(shapes);
}
 
void KoPathTool::notifyPathPointsChanged(KoPathShape *shape)
{
    Q_UNUSED(shape);
 
    // active handle and selection might have already become invalid, so just
    // delete them without dereferencing anything...
 
    m_activeHandle.reset();
    m_activeSegment.reset();
}
 
void KoPathTool::clearActivePointSelectionReferences()
{
    m_activeHandle.reset();
    m_activeSegment.reset();
    m_pointSelection.clear();
}
 
void KoPathTool::initializeWithShapes(const QList<KoShape*> shapes)
{
    QList<KoPathShape*> selectedShapes;
    Q_FOREACH (KoShape *shape, shapes) {
        KoPathShape *pathShape = dynamic_cast<KoPathShape*>(shape);
 
        if (pathShape && pathShape->isShapeEditable()) {
            selectedShapes.append(pathShape);
        }
    }
 
    if (selectedShapes != m_pointSelection.selectedShapes()) {
        clearActivePointSelectionReferences();
        m_pointSelection.setSelectedShapes(selectedShapes);
        repaintDecorations();
    }
 
    updateOptionsWidget();
    updateActions();
}
 
void KoPathTool::updateOptionsWidget()
{
    PathToolOptionWidget::Types type;
    QList<KoPathShape*> selectedShapes = m_pointSelection.selectedShapes();
    Q_FOREACH (KoPathShape *shape, selectedShapes) {
        KoParameterShape * parameterShape = dynamic_cast<KoParameterShape*>(shape);
        type |= parameterShape && parameterShape->isParametricShape() ?
                    PathToolOptionWidget::ParametricShape : PathToolOptionWidget::PlainPath;
    }
 
    Q_EMIT singleShapeChanged(selectedShapes.size() == 1 ? selectedShapes.first() : 0);
    Q_EMIT typeChanged(type);
}
 
void KoPathTool::updateActions()
{
    QList<KoPathPointData> pointData = m_pointSelection.selectedPointsData();
 
    bool canBreakAtPoint = false;
 
    bool hasNonSmoothPoints = false;
    bool hasNonSymmetricPoints = false;
    bool hasNonSplitPoints = false;
 
    bool hasNonLinePoints = false;
    bool hasNonCurvePoints = false;
 
    bool canJoinSubpaths = false;
 
    if (!pointData.isEmpty()) {
        Q_FOREACH (const KoPathPointData &pd, pointData) {
            const int subpathIndex = pd.pointIndex.first;
            const int pointIndex = pd.pointIndex.second;
 
            canBreakAtPoint |= pd.pathShape->isClosedSubpath(subpathIndex) ||
                    (pointIndex > 0 && pointIndex < pd.pathShape->subpathPointCount(subpathIndex) - 1);
 
            KoPathPoint *point = pd.pathShape->pointByIndex(pd.pointIndex);
 
            hasNonSmoothPoints |= !(point->properties() & KoPathPoint::IsSmooth);
            hasNonSymmetricPoints |= !(point->properties() & KoPathPoint::IsSymmetric);
            hasNonSplitPoints |=
                    point->properties() & KoPathPoint::IsSymmetric ||
                    point->properties() & KoPathPoint::IsSmooth;
 
            hasNonLinePoints |= point->activeControlPoint1() || point->activeControlPoint2();
            hasNonCurvePoints |= !point->activeControlPoint1() && !point->activeControlPoint2();
        }
 
        if (pointData.size() == 2) {
            const KoPathPointData & pd1 = pointData.at(0);
            const KoPathPointData & pd2 = pointData.at(1);
 
            canJoinSubpaths = checkCanJoinToPoints(pd1, pd2);
        }
    }
 
    m_actionPathPointCorner->setEnabled(hasNonSplitPoints);
    m_actionPathPointSmooth->setEnabled(hasNonSmoothPoints);
    m_actionPathPointSymmetric->setEnabled(hasNonSymmetricPoints);
 
    m_actionRemovePoint->setEnabled(!pointData.isEmpty());
 
    m_actionBreakPoint->setEnabled(canBreakAtPoint);
 
    m_actionCurvePoint->setEnabled(hasNonCurvePoints);
    m_actionLinePoint->setEnabled(hasNonLinePoints);
 
    m_actionJoinSegment->setEnabled(canJoinSubpaths);
    m_actionMergePoints->setEnabled(canJoinSubpaths);
 
    QList<KoPathPointData> segments(m_pointSelection.selectedSegmentsData());
 
 
    bool canSplitAtSegment = false;
    bool canConvertSegmentToLine = false;
    bool canConvertSegmentToCurve= false;
 
    if (!segments.isEmpty()) {
 
        canSplitAtSegment = segments.size() == 1;
 
        bool hasLines = false;
        bool hasCurves = false;
 
        Q_FOREACH (const KoPathPointData &pd, segments) {
            KoPathSegment segment = pd.pathShape->segmentByIndex(pd.pointIndex);
            hasLines |= segment.degree() == 1;
            hasCurves |= segment.degree() > 1;
        }
 
        canConvertSegmentToLine = !segments.isEmpty() && hasCurves;
        canConvertSegmentToCurve= !segments.isEmpty() && hasLines;
    }
 
    m_actionAddPoint->setEnabled(canSplitAtSegment);
 
    m_actionLineSegment->setEnabled(canConvertSegmentToLine);
    m_actionCurveSegment->setEnabled(canConvertSegmentToCurve);
 
    m_actionBreakSegment->setEnabled(canSplitAtSegment);
    m_actionBreakSelection->setEnabled(canSplitAtSegment | canBreakAtPoint);
 
    KoSelection *selection = canvas()->selectedShapesProxy()->selection();
    bool haveConvertibleShapes = false;
    Q_FOREACH (KoShape *shape, selection->selectedEditableShapes()) {
        KoParameterShape * parameterShape = dynamic_cast<KoParameterShape*>(shape);
        KoSvgTextShape *textShape = dynamic_cast<KoSvgTextShape*>(shape);
        if (textShape ||
                (parameterShape && parameterShape->isParametricShape())) {
 
            haveConvertibleShapes = true;
            break;
        }
    }
    m_actionConvertToPath->setEnabled(haveConvertibleShapes);
}
 
void KoPathTool::deactivate()
{
    Q_D(KoToolBase);
 
    m_shapeFillResourceConnector.disconnect();
    m_canvasConnections.clear();
    m_pointSelection.clear();
    m_pointSelection.setSelectedShapes(QList<KoPathShape*>());
    m_activeHandle.reset();
    m_activeSegment.reset();
    m_currentStrategy.reset();
    d->canvas->snapGuide()->reset();
 
    disconnect(m_actionCurvePoint, 0, this, 0);
    disconnect(m_actionLinePoint, 0, this, 0);
    disconnect(m_actionLineSegment, 0, this, 0);
    disconnect(m_actionCurveSegment, 0, this, 0);
    disconnect(m_actionAddPoint, 0, this, 0);
    disconnect(m_actionRemovePoint, 0, this, 0);
    disconnect(m_actionBreakPoint, 0, this, 0);
    disconnect(m_actionBreakSegment, 0, this, 0);
    disconnect(m_actionBreakSelection, 0, this, 0);
    disconnect(m_actionJoinSegment, 0, this, 0);
    disconnect(m_actionMergePoints, 0, this, 0);
    disconnect(m_actionConvertToPath, 0, this, 0);
    disconnect(m_actionPathPointCorner, 0, this, 0);
    disconnect(m_actionPathPointSmooth, 0, this, 0);
    disconnect(m_actionPathPointSymmetric, 0, this, 0);
    disconnect(&m_pointSelection, 0, this, 0);
 
    KoToolBase::deactivate();
}
 
void KoPathTool::canvasResourceChanged(int key, const QVariant & /*res*/)
{
    if (key == KoCanvasResource::HandleRadius || key == KoCanvasResource::DecorationThickness) {
        repaintDecorations();
    }
}
 
void KoPathTool::pointSelectionChanged()
{
    Q_D(KoToolBase);
    updateActions();
    d->canvas->snapGuide()->setIgnoredPathPoints(QList<KoPathPoint*>(m_pointSelection.selectedPoints().begin(), m_pointSelection.selectedPoints().end()));
    Q_EMIT selectionChanged(m_pointSelection.hasSelection());
}
 
namespace {
void addActionsGroupIfEnabled(QMenu *menu, QAction *a1, QAction *a2)
{
    if (a1->isEnabled() || a2->isEnabled()) {
        menu->addAction(a1);
        menu->addAction(a2);
        menu->addSeparator();
    }
}
 
void addActionsGroupIfEnabled(QMenu *menu, QAction *a1, QAction *a2, QAction *a3)
{
    if (a1->isEnabled() || a2->isEnabled()) {
        menu->addAction(a1);
        menu->addAction(a2);
        menu->addAction(a3);
        menu->addSeparator();
    }
}
}
 
QMenu *KoPathTool::popupActionsMenu()
{
    if (m_activeHandle) {
        m_activeHandle->trySelectHandle();
    }
 
    if (m_activeSegment && m_activeSegment->isValid()) {
        KoPathShape *shape = m_activeSegment->path;
        KoPathSegment segment = shape->segmentByIndex(shape->pathPointIndex(m_activeSegment->segmentStart));
 
        m_pointSelection.add(segment.first(), true);
        m_pointSelection.add(segment.second(), false);
    }
 
    if (m_contextMenu) {
        m_contextMenu->clear();
 
        addActionsGroupIfEnabled(m_contextMenu.data(),
                                 m_actionPathPointCorner,
                                 m_actionPathPointSmooth,
                                 m_actionPathPointSymmetric);
 
        addActionsGroupIfEnabled(m_contextMenu.data(),
                                 m_actionCurvePoint,
                                 m_actionLinePoint);
 
        addActionsGroupIfEnabled(m_contextMenu.data(),
                                 m_actionAddPoint,
                                 m_actionRemovePoint);
 
        addActionsGroupIfEnabled(m_contextMenu.data(),
                                 m_actionLineSegment,
                                 m_actionCurveSegment);
 
        addActionsGroupIfEnabled(m_contextMenu.data(),
                                 m_actionBreakPoint,
                                 m_actionBreakSegment);
 
        addActionsGroupIfEnabled(m_contextMenu.data(),
                                 m_actionJoinSegment,
                                 m_actionMergePoints);
 
        m_contextMenu->addAction(m_actionConvertToPath);
 
        m_contextMenu->addSeparator();
    }
 
    return m_contextMenu.data();
}
 
void KoPathTool::deleteSelection()
{
    removePoints();
}
 
KoToolSelection * KoPathTool::selection()
{
    return &m_pointSelection;
}
 
void KoPathTool::requestUndoDuringStroke()
{
    // noop!
}
 
void KoPathTool::requestStrokeCancellation()
{
    explicitUserStrokeEndRequest();
}
 
void KoPathTool::requestStrokeEnd()
{
    // noop!
}
 
void KoPathTool::explicitUserStrokeEndRequest()
{
    KoToolManager::instance()->switchToolRequested("InteractionTool");
}
 
bool KoPathTool::selectAll()
{
    m_pointSelection.selectAll();
    repaintDecorations();
    return true;
}
 
void KoPathTool::deselect()
{
    clearActivePointSelectionReferences();
    repaintDecorations();
}