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// envelope.h
/******************************************************************************
*
* MiXViews - an X window system based sound & data editor/processor
*
* Copyright (c) 1993, 1994 Regents of the University of California
*
* Author: Douglas Scott
* Date: December 13, 1994
*
* Permission to use, copy and modify this software and its documentation
* for research and/or educational purposes and without fee is hereby granted,
* provided that the above copyright notice appear in all copies and that
* both that copyright notice and this permission notice appear in
* supporting documentation. The author reserves the right to distribute this
* software and its documentation. The University of California and the author
* make no representations about the suitability of this software for any
* purpose, and in no event shall University of California be liable for any
* damage, loss of data, or profits resulting from its use.
* It is provided "as is" without express or implied warranty.
*
******************************************************************************/
// Envelope functions as a generic data class for editing and storage of
// contiguous binary floating point data. Envelope values are used as
// multipliers in many operations in which a time-variable value is desired.
// The added functionality beyond FrameData is: automatic interpolated lookup
// and customizable alternate range displays and labels.
// Envelope is a restricted version of Data: always type float, always one
// channel, for use as an envelope for such things as pitch, amplitude, and
// other one-dimensional arrays used by functions.
#ifndef ENVELOPE_H
#ifdef __GNUG__
#pragma interface
#endif
#define ENVELOPE_H
#include "framedata.h"
#include "range.h"
class Controller;
class Header;
class Envelope : public FrameData {
typedef FrameData Super;
enum Size { DefaultEnvelopeSize = 1024 };
public:
Envelope();
Envelope(int len);
virtual ~Envelope();
redefined Data *newData();
redefined Data *newData(int len);
redefined Data *clone(const Range &r);
redefined Data *clone(const Range &r, const Range &c);
virtual double next();
virtual void reset();
void setMappingLength(int mlength);
redefined int channels() const { return 1; }
redefined void information(Controller *);
// information methods for display objects
redefined const char* windowClassName() const;
redefined const char* channelDisplayAttribute() const;
redefined const char* horizontalScaleModeAttribute() const;
redefined const char* defaultDirAttribute() const;
void setFrameRangeLabel(const char*);
void setRangeFactor(double fac, double offset = 0);
void setChannelName(const char*);
redefined Range frameRange(RangeUnit units) const;
redefined const char* frameRangeLabel(RangeUnit units) const;
redefined const char* channelName(int chan) const;
redefined FileType fileType() const { return EVP_Data; }
redefined const char *fileSuffix() const { return ".evp"; }
redefined Header* createHeader(DataFile *, boolean reading);
protected:
redefined void readFromHeader(Header *);
redefined void checkValues();
Envelope(const Envelope *e) : FrameData(e) { init(); }
Envelope(const Envelope *e, int newlen) : FrameData(e, newlen) { init(); }
Envelope(const Envelope *e, const Range &r) : FrameData(e, r) { init(); }
Envelope(const Envelope *e, const Range &r, const Range &c)
: FrameData(e, r, c) { init(); }
private:
int mappinglength; // number of values to interp to
double currentIndex; // current location in array
int oldindex;
double increment, // these are all used for interpolated lookup
fraction,
currentVal,
nextVal;
char* frameLabel; // custom labels for visual display
char* channelLabel;
double rangeFactor, // modifiers for custom horiz range
rangeOffset;
void init();
};
inline void
Envelope::setMappingLength(int mlength) {
mappinglength = mlength;
increment = double(length()) / mappinglength;
}
inline const char*
Envelope::windowClassName() const { return "EnvelopeWindow"; }
inline const char*
Envelope::channelDisplayAttribute() const {
return "EnvelopeWindowDisplayChannels";
}
inline const char*
Envelope::horizontalScaleModeAttribute() const {
return "EnvelopeWindowHorizontalScale";
}
inline const char*
Envelope::defaultDirAttribute() const {
return "DefaultEnvelopeFileDir";
}
inline void
Envelope::setRangeFactor(double fac, double offset) {
rangeFactor = fac; rangeOffset = offset;
}
#endif
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