File indexing completed on 2024-04-21 14:50:39

 // SPDX-License-Identifier: LGPL-2.1-or-later
 //
 // SPDX-FileCopyrightText: 2006-2009 Torsten Rahn <tackat@kde.org>
 // SPDX-FileCopyrightText: 2007 Inge Wallin <ingwa@kde.org>
 //
 
 #ifndef MARBLE_CLIPPAINTER_H
 #define MARBLE_CLIPPAINTER_H
 
 #include <QPainter>
 #include "marble_export.h"
 #include "MarbleGlobal.h"
 
 class QPaintDevice;
 class QPolygonF;
 class QPointF;
 
 namespace Marble
 {
 /**
  * @short A QPainter that does viewport clipping for polygons 
  *
  * This class introduces fast polygon/polyline clipping for QPainter
  * to increase the performance.
  * Clipping is accomplished using an algorithm (by Torsten Rahn) that 
  * processes each polyline once. 
  * To keep things fast each possible scenario of two subsequent 
  * points is implemented case by case in a specialized handler which
  * creates interpolated points and helper points.
  */
 
 // The reason for this class is a terrible bug in some versions of the
 // X Server.  Suppose the widget size is, say, 1000 x 1000 and we have
 // a high zoom so that we want to draw a vector from (-100000,
 // -100000) to (100000, 100000).  Then the X server will create a
 // bitmap that is at least 100000 x 100000 and in the process eat all
 // available memory.
 //
 // So we introduce the ClipPainter that clips all polylines and polygons 
 // to the area that is actually visible in the viewport.
 //
 // @internal
 
 class ClipPainterPrivate;
 class MARBLE_EXPORT ClipPainter : public QPainter 
 {
  public:
     ClipPainter();
     ClipPainter(QPaintDevice*, bool);
 
     ~ClipPainter();
 
     void setScreenClip( bool enable );
     bool hasScreenClip() const;
 
     void drawPolygon( const QPolygonF &, 
                       Qt::FillRule fillRule = Qt::OddEvenFill );
 
     void drawPolyline( const QPolygonF & );
     void drawPolyline( const QPolygonF &, QVector<QPointF>& labelNodes, 
                        LabelPositionFlags labelPositionFlag = LineCenter );
 
     void labelPosition(const QPolygonF &polygon, QVector<QPointF> &labelNodes,
                        LabelPositionFlags labelPositionFlags) const;
 
     void setPen(const QColor &);
     void setPen(const QPen & pen);
     void setPen(Qt::PenStyle style);
     void setBrush(const QBrush & brush);
 
     void setDebugPolygonsLevel( int );
     void setDebugBatchRender( bool );
 
     //  void clearNodeCount(){ m_debugNodeCount = 0; }
     //  int nodeCount(){ return m_debugNodeCount; }
 
  private:
     ClipPainterPrivate * const d;
 };
 
 }
 
 #endif