FilterCanvas.h

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#ifndef __FILTER_CANVAS_H__
#define __FILTER_CANVAS_H__

#include "CS123Canvas.h"

class FilterApp;
class Filter;

enum FILTER {
   //! Required Filters
   NONE, GREYSCALE, BLUR, SCALE, EDGEDETECT, INVERT, 

   //! Extra Credit -- Huzzah!
   ROTATE, SPECIAL1, SPECIAL2, SEAMCARVING
};

//! Specialized canvas for filter 
/* This class has some methods that will be called automatically to 
 * facilitate the UI interaction for required filters.  You will not
 * need to modify this file */
class FilterCanvas : public CS123Canvas {
   
   Q_OBJECT

   public:
      FilterCanvas();
      virtual ~FilterCanvas();

   public slots:
      //! Should apply the current filter to this canvas
      virtual void applyFilter() = 0;
      
      //! Should change the current filter of this canvas
      virtual void setFilter(int) = 0;
      
      //! The following methods are called whenever the default controls 
      //! are changed for a filter in FilterApp.C
      //! --------------------------------------------------------------
      virtual void filterBlurKernelWidthChanged(int newWidth) = 0;
      
      virtual void filterScaleWidthChanged(int newWidth) = 0;
      virtual void filterScaleHeightChanged(int newHeight) = 0;
      
      virtual void filterEdgeDetectThresholdChanged(int threshold) = 0;
      
      //! Extra Credit notifications (default handling is to ignore the signal)
      //! Note:  If you want to add your own controls, create the appropriate 
      //! controls in FilterControls.C, and then add your SLOTS here to notify 
      //! your canvas when sliders/values are changed in the gui.
      virtual void filterRotateRotationChanged(int degrees);

      //! Note:  for SEAMCARVING, the same control signals are sent as the normal SCALE

   protected:
      //! Currently selected filter
      Filter *m_filter;
};

#endif