SndEnvelope.h

//
//  SndEnvelope.h
//  SndKit
//
//  Created by stephen brandon on Mon Jun 23 2001. <stephen@brandonitconsulting.co.uk>
//  Copyright (c) 2001, The MusicKit Project.  All rights reserved.
//
//  Permission is granted to use and modify this code for commercial and 
//  non-commercial purposes so long as the author attribution and copyright
//  messages remain intact and accompany all relevant code.
//

#ifndef __SNDENVELOPE_H__
#define __SNDENVELOPE_H__

#import <Foundation/Foundation.h>
#import "SndBreakpoint.h"

#define BP_NOT_FOUND (-1)

@protocol SndEnveloping

//- (double)lookupYForXAsymptotic:(double)xVal;

- (float)lookupYForX:(double)xVal;

- (int) breakpointIndexBeforeOrEqualToX:(double)xVal;

- (int) breakpointIndexAfterX:(double)xVal;

- (double) lookupXForBreakpoint:(int)bp;

- (float) lookupYForBreakpoint:(int)bp;

- (int) lookupFlagsForBreakpoint: (int) bp;

- (int) breakpointCount;

- (int) insertXValue: (double) xVal yValue: (float) yVal flags: (int) flags;

- (int) insertXValue: (double) xVal yValue: (float) yVal flags: (int) flags atBreakpoint: (int) bp;

- (BOOL) removeBreakpoint: (int) bp;

- (BOOL) removeBreakpointsBefore: (int) aBreakpoint;

- (BOOL) removeBreakpointsAfter: (int) aBreakpoint;

- (BOOL) replaceXValue: (double) xVal yValue: (float) yVal flags: (int) flags atBreakpoint: (int) bp;

@end

@interface SndEnvelope : NSObject <SndEnveloping>
{
  NSLock *lock;  
  NSMutableArray *breakpoints; 
}

- (int) breakpointIndexBeforeOrEqualToX:(double)xVal;

- (int) breakpointIndexAfterX: (double) xVal;

- (float) lookupYForBreakpoint: (int) bp;

- (int) insertXValue: (double) xVal yValue: (float) yVal flags: (int) flags;

- (int) insertXValue: (double) xVal yValue: (float) yVal flags: (int) flags atBreakpoint: (int) bp;

- (BOOL) removeBreakpoint: (int) aBreakpoint;

- (BOOL) removeBreakpointsBefore: (int) aBreakpoint;

- (BOOL) removeBreakpointsAfter: (int) aBreakpoint;

- (BOOL) replaceXValue: (double) xVal yValue: (float) yVal flags: (int) flags atBreakpoint: (int) bp;

@end


#endif

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