File indexing completed on 2024-05-12 15:56:43

 /* This file is part of the KDE project
    SPDX-FileCopyrightText: 2006 Thorsten Zachmann <zachmann@kde.org>
    SPDX-FileCopyrightText: 2006-2008 Jan Hambrecht <jaham@gmx.net>
    SPDX-FileCopyrightText: 2007 Thomas Zander <zander@kde.org>
 
    SPDX-License-Identifier: LGPL-2.0-or-later
 */
 
 #include "KoPathPoint.h"
 #include "KoPathShape.h"
 
 #include <FlakeDebug.h>
 #include <QPainter>
 #include <QPointF>
 #include <KisHandlePainterHelper.h>
 
 #include <math.h>
 
 #include <qnumeric.h> // for qIsNaN
 static bool qIsNaNPoint(const QPointF &p) {
     return qIsNaN(p.x()) || qIsNaN(p.y());
 }
 
 class Q_DECL_HIDDEN KoPathPoint::Private
 {
 public:
     Private()
             : shape(0), properties(Normal)
             , activeControlPoint1(false), activeControlPoint2(false) {}
     KoPathShape * shape;
     QPointF point;
     QPointF controlPoint1;
     QPointF controlPoint2;
     PointProperties properties;
     bool activeControlPoint1;
     bool activeControlPoint2;
 };
 
 KoPathPoint::KoPathPoint(const KoPathPoint &pathPoint)
         : d(new Private())
 {
     d->shape = 0;
     d->point = pathPoint.d->point;
     d->controlPoint1 = pathPoint.d->controlPoint1;
     d->controlPoint2 = pathPoint.d->controlPoint2;
     d->properties = pathPoint.d->properties;
     d->activeControlPoint1 = pathPoint.d->activeControlPoint1;
     d->activeControlPoint2 = pathPoint.d->activeControlPoint2;
 }
 
 KoPathPoint::KoPathPoint(const KoPathPoint &pathPoint, KoPathShape *newParent)
     : KoPathPoint(pathPoint)
 {
     d->shape = newParent;
 }
 
 KoPathPoint::KoPathPoint()
         : d(new Private())
 {
 }
 
 KoPathPoint::KoPathPoint(KoPathShape * path, const QPointF &point, PointProperties properties)
         : d(new Private())
 {
     d->shape = path;
     d->point = point;
     d->controlPoint1 = point;
     d->controlPoint2 = point;
     d->properties = properties;
 }
 
 KoPathPoint::~KoPathPoint()
 {
     delete d;
 }
 
 KoPathPoint &KoPathPoint::operator=(const KoPathPoint &rhs)
 {
     if (this == &rhs)
         return (*this);
 
     d->shape = rhs.d->shape;
     d->point = rhs.d->point;
     d->controlPoint1 = rhs.d->controlPoint1;
     d->controlPoint2 = rhs.d->controlPoint2;
     d->properties = rhs.d->properties;
     d->activeControlPoint1 = rhs.d->activeControlPoint1;
     d->activeControlPoint2 = rhs.d->activeControlPoint2;
 
     return (*this);
 }
 
 bool KoPathPoint::operator == (const KoPathPoint &rhs) const
 {
     if (d->point != rhs.d->point)
         return false;
     if (d->controlPoint1 != rhs.d->controlPoint1)
         return false;
     if (d->controlPoint2 != rhs.d->controlPoint2)
         return false;
     if (d->properties != rhs.d->properties)
         return false;
     if (d->activeControlPoint1 != rhs.d->activeControlPoint1)
         return false;
     if (d->activeControlPoint2 != rhs.d->activeControlPoint2)
         return false;
     return true;
 }
 
 void KoPathPoint::setPoint(const QPointF &point)
 {
     d->point = point;
     if (d->shape)
         d->shape->notifyChanged();
 }
 
 void KoPathPoint::setControlPoint1(const QPointF &point)
 {
     if (qIsNaNPoint(point)) return;
 
     d->controlPoint1 = point;
     d->activeControlPoint1 = true;
     if (d->shape)
         d->shape->notifyChanged();
 }
 
 void KoPathPoint::setControlPoint2(const QPointF &point)
 {
     if (qIsNaNPoint(point)) return;
 
     d->controlPoint2 = point;
     d->activeControlPoint2 = true;
     if (d->shape)
         d->shape->notifyChanged();
 }
 
 void KoPathPoint::removeControlPoint1()
 {
     d->activeControlPoint1 = false;
     d->properties &= ~IsSmooth;
     d->properties &= ~IsSymmetric;
     if (d->shape)
         d->shape->notifyChanged();
 }
 
 void KoPathPoint::removeControlPoint2()
 {
     d->activeControlPoint2 = false;
     d->properties &= ~IsSmooth;
     d->properties &= ~IsSymmetric;
     if (d->shape)
         d->shape->notifyChanged();
 }
 
 void KoPathPoint::setProperties(PointProperties properties)
 {
     d->properties = properties;
     // CloseSubpath only allowed with StartSubpath or StopSubpath
     if ((d->properties & StartSubpath) == 0 && (d->properties & StopSubpath) == 0)
         d->properties &= ~CloseSubpath;
 
     if (! activeControlPoint1() || ! activeControlPoint2()) {
         // strip smooth and symmetric flags if point has not two control points
         d->properties &= ~IsSmooth;
         d->properties &= ~IsSymmetric;
     }
 
     if (d->shape)
         d->shape->notifyChanged();
 }
 
 void KoPathPoint::setProperty(PointProperty property)
 {
     switch (property) {
     case StartSubpath:
     case StopSubpath:
     case CloseSubpath:
         // nothing special to do here
         break;
     case IsSmooth:
         d->properties &= ~IsSymmetric;
         break;
     case IsSymmetric:
         d->properties &= ~IsSmooth;
         break;
     default: return;
     }
 
     d->properties |= property;
 
     if (! activeControlPoint1() || ! activeControlPoint2()) {
         // strip smooth and symmetric flags if point has not two control points
         d->properties &= ~IsSymmetric;
         d->properties &= ~IsSmooth;
     }
 }
 
 void KoPathPoint::unsetProperty(PointProperty property)
 {
     switch (property) {
     case StartSubpath:
         if (d->properties & StartSubpath && (d->properties & StopSubpath) == 0)
             d->properties &= ~CloseSubpath;
         break;
     case StopSubpath:
         if (d->properties & StopSubpath && (d->properties & StartSubpath) == 0)
             d->properties &= ~CloseSubpath;
         break;
     case CloseSubpath:
         if (d->properties & StartSubpath || d->properties & StopSubpath) {
             d->properties &= ~IsSmooth;
             d->properties &= ~IsSymmetric;
         }
         break;
     case IsSmooth:
     case IsSymmetric:
         // no others depend on these
         break;
     default: return;
     }
     d->properties &= ~property;
 }
 
 bool KoPathPoint::activeControlPoint1() const
 {
     // only start point on closed subpaths can have a controlPoint1
     if ((d->properties & StartSubpath) && (d->properties & CloseSubpath) == 0)
         return false;
 
     return d->activeControlPoint1;
 }
 
 bool KoPathPoint::activeControlPoint2() const
 {
     // only end point on closed subpaths can have a controlPoint2
     if ((d->properties & StopSubpath) && (d->properties & CloseSubpath) == 0)
         return false;
 
     return d->activeControlPoint2;
 }
 
 void KoPathPoint::map(const QTransform &matrix)
 {
     d->point = matrix.map(d->point);
     d->controlPoint1 = matrix.map(d->controlPoint1);
     d->controlPoint2 = matrix.map(d->controlPoint2);
 
     if (d->shape)
         d->shape->notifyChanged();
 }
 
 void KoPathPoint::paint(KisHandlePainterHelper &handlesHelper, PointTypes types, bool active)
 {
     bool drawControlPoint1 = types & ControlPoint1 && (!active || activeControlPoint1());
     bool drawControlPoint2 = types & ControlPoint2 && (!active || activeControlPoint2());
 
     // draw lines at the bottom
     if (drawControlPoint2) {
         handlesHelper.drawConnectionLine(point(), controlPoint2());
     }
 
     if (drawControlPoint1) {
         handlesHelper.drawConnectionLine(point(), controlPoint1());
     }
 
     // the point is lowest
     if (types & Node) {
         if (properties() & IsSmooth) {
             handlesHelper.drawHandleCircle(point());
         } else if (properties() & IsSymmetric) {
             handlesHelper.drawHandleRect(point());
         } else {
             handlesHelper.drawGradientHandle(point());
         }
     }
 
     // then comes control point 2
     if (drawControlPoint2) {
         handlesHelper.drawHandleSmallCircle(controlPoint2());
     }
 
     // then comes control point 1
     if (drawControlPoint1) {
         handlesHelper.drawHandleSmallCircle(controlPoint1());
     }
 }
 
 void KoPathPoint::setParent(KoPathShape* parent)
 {
     // don't set to zero
     //Q_ASSERT(parent);
     d->shape = parent;
 }
 
 QRectF KoPathPoint::boundingRect(bool active) const
 {
     QRectF rect(d->point, QSize(1, 1));
     if (!active && activeControlPoint1()) {
         QRectF r1(d->point, QSize(1, 1));
         r1.setBottomRight(d->controlPoint1);
         rect = rect.united(r1);
     }
     if (!active && activeControlPoint2()) {
         QRectF r2(d->point, QSize(1, 1));
         r2.setBottomRight(d->controlPoint2);
         rect = rect.united(r2);
     }
     if (d->shape)
         return d->shape->shapeToDocument(rect);
     else
         return rect;
 }
 
 void KoPathPoint::reverse()
 {
     std::swap(d->controlPoint1, d->controlPoint2);
     std::swap(d->activeControlPoint1, d->activeControlPoint2);
     PointProperties newProps = Normal;
     newProps |= d->properties & IsSmooth;
     newProps |= d->properties & IsSymmetric;
     newProps |= d->properties & StartSubpath;
     newProps |= d->properties & StopSubpath;
     newProps |= d->properties & CloseSubpath;
     d->properties = newProps;
 }
 
 bool KoPathPoint::isSmooth(KoPathPoint * prev, KoPathPoint * next) const
 {
     QPointF t1, t2;
 
     if (activeControlPoint1()) {
         t1 = point() - controlPoint1();
     } else {
         // we need the previous path point but there is none provided
         if (! prev)
             return false;
         if (prev->activeControlPoint2())
             t1 = point() - prev->controlPoint2();
         else
             t1 = point() - prev->point();
     }
 
     if (activeControlPoint2()) {
         t2 = controlPoint2() - point();
     } else {
         // we need the next path point but there is none provided
         if (! next)
             return false;
         if (next->activeControlPoint1())
             t2 = next->controlPoint1() - point();
         else
             t2 = next->point() - point();
     }
 
     // normalize tangent vectors
     qreal l1 = sqrt(t1.x() * t1.x() + t1.y() * t1.y());
     qreal l2 = sqrt(t2.x() * t2.x() + t2.y() * t2.y());
     if (qFuzzyCompare(l1 + 1, qreal(1.0)) || qFuzzyCompare(l2 + 1, qreal(1.0)))
         return true;
 
     t1 /= l1;
     t2 /= l2;
 
     qreal scalar = t1.x() * t2.x() + t1.y() * t2.y();
     // tangents are parallel if t1*t2 = |t1|*|t2|
     return qFuzzyCompare(scalar, qreal(1.0));
 }
 
 KoPathPoint::PointProperties KoPathPoint::properties() const
 {
     return d->properties;
 }
 
 QPointF KoPathPoint::point() const
 {
     return d->point;
 }
 
 QPointF KoPathPoint::controlPoint1() const
 {
     return d->controlPoint1;
 }
 
 QPointF KoPathPoint::controlPoint2() const
 {
     return d->controlPoint2;
 }
 
 KoPathShape * KoPathPoint::parent() const
 {
     return d->shape;
 }