/*

Copyright (C) 2016 Apple Inc. All Rights Reserved.

See LICENSE.txt for this sample’s licensing information

Abstract:

AU Filter Graph View

*/

#import <Cocoa/Cocoa.h>

#import "Filter.h"

/************************************************************************************************************/

/* NOTE: It is important to rename ALL ui classes when using the XCode Audio Unit with Cocoa View template  */

/*       Cocoa has a flat namespace, and if you use the default filenames, it is possible that you will     */

/*       get a namespace collision with classes from the cocoa view of a previously loaded audio unit.      */

/*       We recommend that you use a unique prefix that includes the manufacturer name and unit name on     */

/*       all objective-C source files. You may use an underscore in your name, but please refrain from      */

/*       starting your class name with an undescore as these names are reserved for Apple.                  */

/************************************************************************************************************/

@interface AppleDemoFilter_GraphView : NSView

{   

    NSRect  mGraphFrame;        // This is the frame of the drawing area of the view

    float   mActiveWidth;       // The usable portion of the graph

    NSPoint mEditPoint;         // This is the current location in the drawing area that is active

    BOOL    mMouseDown;         // True if the mouse is currently down

    NSColor *curveColor;        // the current color of the graph curve

    NSImage *mBackgroundCache;  // An image cache of the background so that we don't have to re-draw the grid lines and labels all the time

    float mRes;                 // internal copy of the resonance value

    float mFreq;                // internal copy of the frequency value

    NSBezierPath *mCurvePath;   // The bezier path that is used to draw the curve.

    NSDictionary *mDBAxisStringAttributes;      // Text attributes used to draw the strings on the db axis

    NSDictionary *mFreqAxisStringAttributes;    // Text attributes used to draw the strings on the frequency axis

}

-(void) setRes: (float) res;    // sets the graph's internal resonance value (to match the au)

-(void) setFreq: (float) freq;  // sets the graphs' internal frequency value (to match the au

-(float)getRes;                 // gets the graph's internal resonance value (so the au can match the graph)

-(float)getFreq;                // gets the graph's internal frequency value (so the au can match the graph)

-(double) locationForFrequencyValue: (double) value;    // converts a frequency value to the pixel coordinate in the graph

-(double) locationForDBValue: (double) value;           // converts a db value to the pixel coordinate in the graph

-(FrequencyResponse *) prepareDataForDrawing: (FrequencyResponse *) data;   // prepares the data for drawing by initializing frequency fields based on values on pixel boundaries

-(void) plotData: (FrequencyResponse *) data;                               // draws the curve data

-(void) disableGraphCurve;                                                  // update the view, but don't draw the curve (used when the AU is not initialized and the curve can not be retrieved)

-(void) handleBeginGesture;     // called when parameter automation started

-(void) handleEndGesture;       // called when parameter automation finished

@end