qgsvectorfieldvaluesource.h

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/***************************************************************************
    qgsvectorfieldvaluesource.h
    ---------------------------
    begin                : September 2026
    copyright            : (C) 2026 by Stefanos Natsis
    email                : uclaros at gmail dot 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.                                   *
 *                                                                         *
 ***************************************************************************/
 
#ifndef QGSVECTORFIELDVALUESOURCE_H
#define QGSVECTORFIELDVALUESOURCE_H
 
#include <memory>
 
#include "qgis_core.h"
#include "qgspointxy.h"
#include "qgsrectangle.h"
#include "qgsvector.h"
 
#include <QSize>
#include <QVector>
 
#define SIP_NO_FILE
 
class QgsRasterInterface;
class QgsRenderContext;

class CORE_EXPORT QgsVectorFieldValueSource
{
  public:
    QgsVectorFieldValueSource() = default;
    virtual ~QgsVectorFieldValueSource();

    virtual QgsVectorFieldValueSource *clone() const = 0;

    virtual QgsVector vectorValue( const QgsPointXY &point ) const = 0;

    virtual QgsRectangle extent() const = 0;

    virtual double maximumMagnitude() const = 0;

    virtual QVector<QgsPointXY> seedPoints( const QgsRectangle &extent ) const;

    virtual std::unique_ptr<QgsRasterInterface> magnitudeSource( const QgsRenderContext &context, QSize size ) const;
};
 
#endif // QGSVECTORFIELDVALUESOURCE_H