Warning, file /office/calligra/libs/flake/KoClipPath.cpp was not indexed or was modified since last indexation (in which case cross-reference links may be missing, inaccurate or erroneous).

 /* This file is part of the KDE project
  * Copyright (C) 2011 Jan Hambrecht <jaham@gmx.net>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */
 
 #include "KoClipPath.h"
 #include "KoPathShape.h"
 #include "KoViewConverter.h"
 
 #include <QTransform>
 #include <QPainterPath>
 #include <QPainter>
 #include <QGraphicsItem>
 #include <QVarLengthArray>
 
 QTransform scaleToPercent(const QSizeF &size)
 {
     const qreal w = qMax(static_cast<qreal>(1e-5), size.width());
     const qreal h = qMax(static_cast<qreal>(1e-5), size.height());
     return QTransform().scale(100/w, 100/h);
 }
 
 QTransform scaleFromPercent(const QSizeF &size)
 {
     const qreal w = qMax(static_cast<qreal>(1e-5), size.width());
     const qreal h = qMax(static_cast<qreal>(1e-5), size.height());
     return QTransform().scale(w/100, h/100);
 }
 
 class Q_DECL_HIDDEN KoClipData::Private
 {
 public:
     Private() : deleteClipShapes(true)
     {
     }
 
     ~Private()
     {
         if (deleteClipShapes)
             qDeleteAll(clipPathShapes);
     }
 
     QList<KoPathShape*> clipPathShapes;
     bool deleteClipShapes;
 };
 
 KoClipData::KoClipData(KoPathShape *clipPathShape)
         : d(new Private())
 {
     Q_ASSERT(clipPathShape);
     d->clipPathShapes.append(clipPathShape);
 }
 
 KoClipData::KoClipData(const QList<KoPathShape*> &clipPathShapes)
         : d(new Private())
 {
     Q_ASSERT(clipPathShapes.count());
     d->clipPathShapes = clipPathShapes;
 }
 
 KoClipData::~KoClipData()
 {
     delete d;
 }
 
 QList<KoPathShape*> KoClipData::clipPathShapes() const
 {
     return d->clipPathShapes;
 }
 
 void KoClipData::removeClipShapesOwnership()
 {
     d->deleteClipShapes = false;
 }
 
 class Q_DECL_HIDDEN KoClipPath::Private
 {
 public:
     Private(KoClipData *data)
             : clipData(data)
     {}
 
     ~Private()
     {
     }
 
     void compileClipPath(KoShape *clippedShape)
     {
         QList<KoPathShape*> clipShapes = clipData->clipPathShapes();
         if (!clipShapes.count())
             return;
 
         initialShapeSize = clippedShape->outline().boundingRect().size();
         initialTransformToShape = clippedShape->absoluteTransformation(0).inverted();
 
         QTransform transformToShape = initialTransformToShape * scaleToPercent(initialShapeSize);
 
         foreach(KoPathShape *path, clipShapes) {
             if (!path)
                 continue;
             // map clip path to shape coordinates of clipped shape
             QTransform m = path->absoluteTransformation(0) * transformToShape;
             if (clipPath.isEmpty())
                 clipPath = m.map(path->outline());
             else
                 clipPath |= m.map(path->outline());
         }
     }
 
     QExplicitlySharedDataPointer<KoClipData> clipData; ///< the clip path data
     QPainterPath clipPath; ///< the compiled clip path in shape coordinates of the clipped shape
     QTransform initialTransformToShape; ///< initial transformation to shape coordinates of the clipped shape
     QSizeF initialShapeSize; ///< initial size of clipped shape
 };
 
 KoClipPath::KoClipPath(KoShape *clippedShape, KoClipData *clipData)
         : d( new Private(clipData) )
 {
     d->compileClipPath(clippedShape);
 }
 
 KoClipPath::~KoClipPath()
 {
     delete d;
 }
 
 void KoClipPath::setClipRule(Qt::FillRule clipRule)
 {
     d->clipPath.setFillRule(clipRule);
 }
 
 Qt::FillRule KoClipPath::clipRule() const
 {
     return d->clipPath.fillRule();
 }
 
 void KoClipPath::applyClipping(KoShape *clippedShape, QPainter &painter, const KoViewConverter &converter)
 {
     QPainterPath clipPath;
     KoShape *shape = clippedShape;
     while (shape) {
         if (shape->clipPath()) {
             QTransform m = scaleFromPercent(shape->outline().boundingRect().size()) * shape->absoluteTransformation(0);
             if (clipPath.isEmpty())
                 clipPath = m.map(shape->clipPath()->path());
             else
                 clipPath |= m.map(shape->clipPath()->path());
         }
         shape = shape->parent();
     }
 
     if (!clipPath.isEmpty()) {
         QTransform viewMatrix;
         qreal zoomX, zoomY;
         converter.zoom(&zoomX, &zoomY);
         viewMatrix.scale(zoomX, zoomY);
         painter.setClipPath(viewMatrix.map(clipPath), Qt::IntersectClip);
     }
 }
 
 QPainterPath KoClipPath::path() const
 {
     return d->clipPath;
 }
 
 QPainterPath KoClipPath::pathForSize(const QSizeF &size) const
 {
     return scaleFromPercent(size).map(d->clipPath);
 }
 
 QList<KoPathShape*> KoClipPath::clipPathShapes() const
 {
     return d->clipData->clipPathShapes();
 }
 
 QTransform KoClipPath::clipDataTransformation(KoShape *clippedShape) const
 {
     if (!clippedShape)
         return d->initialTransformToShape;
 
     // the current transformation of the clipped shape
     QTransform currentShapeTransform = clippedShape->absoluteTransformation(0);
 
     // calculate the transformation which represents any resizing of the clipped shape
     const QSizeF currentShapeSize = clippedShape->outline().boundingRect().size();
     const qreal sx = currentShapeSize.width() / d->initialShapeSize.width();
     const qreal sy = currentShapeSize.height() / d->initialShapeSize.height();
     QTransform scaleTransform = QTransform().scale(sx, sy);
 
     // 1. transform to initial clipped shape coordinates
     // 2. apply resizing transformation
     // 3. convert to current clipped shape document coordinates
     return d->initialTransformToShape * scaleTransform * currentShapeTransform;
 }