qgslayoutitemshape.h

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/***************************************************************************
                              qgslayoutitemshape.h
                             ---------------------
    begin                : July 2017
    copyright            : (C) 2017 by Nyall Dawson
    email                : nyall dot dawson 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 QGSLAYOUTITEMSHAPE_H
#define QGSLAYOUTITEMSHAPE_H

#include "qgis_core.h"
#include "qgslayoutitem.h"
#include "qgslayoutitemregistry.h"
#include "qgssymbol.h"
#include "qgslayoutmeasurement.h"

class CORE_EXPORT QgsLayoutItemShape : public QgsLayoutItem
{
    Q_OBJECT

  public:

    enum Shape
    {
      Ellipse, 
      Rectangle, 
      Triangle 
    };


    explicit QgsLayoutItemShape( QgsLayout *layout );

    static QgsLayoutItemShape *create( QgsLayout *layout ) SIP_FACTORY;


    int type() const override;
    QIcon icon() const override;

    //Overridden to return shape type
    QString displayName() const override;
    QgsLayoutItem::Flags itemFlags() const override;

    QgsLayoutItemShape::Shape shapeType() const { return mShape; }

    void setShapeType( QgsLayoutItemShape::Shape type );

    void setSymbol( QgsFillSymbol *symbol );

    QgsFillSymbol *symbol() { return mShapeStyleSymbol.get(); }

    void setCornerRadius( QgsLayoutMeasurement radius );

    QgsLayoutMeasurement cornerRadius() const { return mCornerRadius; }

    QgsGeometry clipPath() const override;

    // Depending on the symbol style, the bounding rectangle can be larger than the shape
    QRectF boundingRect() const override;

    // Reimplement estimatedFrameBleed, since frames on shapes are drawn using symbology
    // rather than the item's pen
    double estimatedFrameBleed() const override;

    bool accept( QgsStyleEntityVisitorInterface *visitor ) const override;

  protected:

    void draw( QgsLayoutItemRenderContext &context ) override;

    bool writePropertiesToElement( QDomElement &element, QDomDocument &document, const QgsReadWriteContext &context ) const override;
    bool readPropertiesFromElement( const QDomElement &element, const QDomDocument &document, const QgsReadWriteContext &context ) override;

  private slots:

    void refreshSymbol();

    void updateBoundingRect();

  private:

    Shape mShape = Rectangle;

    std::unique_ptr< QgsFillSymbol > mShapeStyleSymbol;

    double mMaxSymbolBleed = 0.0;
    QRectF mCurrentRectangle;

    QgsLayoutMeasurement mCornerRadius;

    QPolygonF calculatePolygon( double scale ) const;
};


#endif //QGSLAYOUTITEMSHAPE_H