text: /***********************************************************************************************************************
  **
  ** Copyright (c) 2015 ETH Zurich
  ** All rights reserved.
  **
  ** Redistribution and use in source and binary forms, with or without modification, are permitted provided that the
  ** following conditions are met:
  **
  **    * Redistributions of source code must retain the above copyright notice, this list of conditions and the following
  **      disclaimer.
  **    * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the
  **      following disclaimer in the documentation and/or other materials provided with the distribution.
  **    * Neither the name of the ETH Zurich nor the names of its contributors may be used to endorse or promote products
  **      derived from this software without specific prior written permission.
  **
  **
  ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
  ** INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  ** DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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  ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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  ***********************************************************************************************************************/
  
  #pragma once
  
  #include "../visualizationbase_api.h"
  #include "../items/ItemStyle.h"
  #include "../overlays/Overlay.h"
  #include "ArrowOverlayStyle.h"
  
  namespace Visualization {
  
  /**
   * An overlay to draw an arrow from the first item to the second item.
   */
  class VISUALIZATIONBASE_API ArrowOverlay: public Super<Overlay<Item>>
  {
  	ITEM_COMMON(ArrowOverlay)
  
  	public:
  		ArrowOverlay(Item* arrowFrom, Item* arrowTo, const StyleType* style = itemStyles().get());
  		virtual void paint(QPainter* painter, const QStyleOptionGraphicsItem* option, QWidget* widget) override;
  		void setHighlighted(bool highlighted);
  
  	protected:
  		virtual void determineChildren() override;
  		virtual void updateGeometry(int availableWidth, int availableHeight) override;
  		virtual QPainterPath shape() const override;
  
  	private:
  		QPoint lineFrom_{};
  		QPoint lineTo_{};
  		bool invertArrow_{};
  		bool highlighted_{false};
  		QPolygonF currentArrowOutline_{};
  
  };
  
  inline void ArrowOverlay::setHighlighted(bool highlighted) {highlighted_ = highlighted;}
  
  }
  