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//
// ChordEngine class to calculate chords
//
// Copyright (c) 2001 Camilo Mesias
// camilo@mesias.co.uk
//
// derived from JavaScript code by Jim Cranwell, used with permission
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
#ifndef __CHORDENGINE_H
#define __CHORDENGINE_H
#include <stdio.h>
class ChordEngine;
class ChordEngine {
private:
//saved state
int base_note;
int chord_type;
int fret_pos;
int span_size;
int variation;
int tuning;
int string[6];
const char *notename[6];
// unfathomable stuff ported from javascript: js_prefix
// may ask Jim Cranwell if he'd like to comment on it
int js_MMM[6];
int note_indices[6];
void js_tunit(int t);
int js_T[12];
void js_whatchord(int c);
int js_L, js_Y, js_Z, js_VM;
void js_vboy(int v);
// stuff I put in
char label_text[20];
static const int chordbases[][12];
static const int alt_tunings[][6];
public:
static const char* notes[];
static const char* keys[];
static const char* frets[];
static const char* variations[];
static const char* tunings[];
static const int OPEN = 0;
static const int MUTED = 7;
ChordEngine();
// accessors
const char *name(int f){return notename[f];};
int noteindex(int f){
if (string[f] == MUTED){
return -1;
}else{
return note_indices[f] + string[f];
}
};
void base(int b){base_note = b;};
int base(){return base_note;};
void chord(int c){chord_type = c; js_whatchord(c);};
int chord(){return chord_type;};
void fret(int f){fret_pos = f;};
int fret(){return fret_pos;};
void span(int s){span_size = s;};
int span(){return span_size;};
void vary(int v){variation = v; js_vboy(v);};
int vary(){return variation;};
void tune(int t){tuning = t; js_tunit(t);};
int tune(){return tuning;};
// methods
void calculate();
const char *label(){return label_text;};
int finger(int string); // returns fret position or MUTED
};
#endif
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