src/core/renderer/qgsrenderer.h

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/***************************************************************************
                         qgsrenderer.h  -  description
                             -------------------
    begin                : Sat Jan 4 2003
    copyright            : (C) 2003 by Gary E.Sherman
    email                : sherman at mrcc.com
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/
/* $Id$ */
#ifndef QGSRENDERER_H
#define QGSRENDERER_H

class QgsFeature;
class QgsVectorLayer;
class QPainter;
class QImage;
class QDomNode;
class QDomDocument;
class QColor;

#include "qgis.h"
#include "qgsrendercontext.h"
#include <QList>

class QgsSymbol;
class QBrush;

typedef QList<int> QgsAttributeList;


class CORE_EXPORT QgsRenderer
{
  public:
    QgsRenderer();
    virtual ~QgsRenderer();
    virtual bool willRenderFeature( QgsFeature *f )
    {
      //prevent unused var warnings
      if ( !f )
      {
        return true;
      }
      return true;
    }
    void renderFeature( QPainter* p, QgsFeature& f, QImage* img, bool selected, double widthScale = 1.0, double rasterScaleFactor = 1.0 )
    {
      QgsRenderContext r;
      r.setPainter( p );
      r.setScaleFactor( widthScale );
      r.setRasterScaleFactor( rasterScaleFactor );
      renderFeature( r, f, img, selected );
    }

    void renderFeature( QgsRenderContext &renderContext, QgsFeature& f, QImage* pic, bool selected )
    {
      renderFeature( renderContext, f, pic, selected, 1.0 );
    }

    virtual void renderFeature( QgsRenderContext &renderContext, QgsFeature& f, QImage* pic, bool selected, double opacity ) = 0;

    virtual int readXML( const QDomNode& rnode, QgsVectorLayer& vl ) = 0;

    // virtual void writeXML(std::ostream& xml)=0;
    virtual bool writeXML( QDomNode & layer_node, QDomDocument & document, const QgsVectorLayer& vl ) const = 0;
    virtual bool needsAttributes() const = 0;
    virtual QgsAttributeList classificationAttributes() const = 0;
    virtual QString name() const = 0;
    virtual const QList<QgsSymbol*> symbols() const = 0;
    virtual QgsRenderer* clone() const = 0;
    static void setSelectionColor( QColor color );
    static QColor selectionColor();
    virtual bool containsPixmap() const;
    virtual bool usesTransparency() const {return false;}

    virtual QgsSymbol* symbolForFeature( const QgsFeature* f ) { return 0;}

    static void scaleBrush( QBrush& b, double rasterScaleFactor );

  protected:
    static QColor mSelectionColor;

    QGis::GeometryType mGeometryType;
};

#endif // QGSRENDERER_H