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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.
#include <stdio.h>
#include <string.h>
#include "chordengine.h"
ChordEngine::ChordEngine(){
string[0] = OPEN;
string[1] = OPEN;
string[2] = OPEN;
string[3] = OPEN;
string[4] = OPEN;
string[5] = OPEN;
base_note = 0;
chord_type = 0;
fret_pos = OPEN;
span_size = 1;
variation = 7;
tuning = 0;
js_tunit(tuning);
js_whatchord(chord_type);
js_vboy(variation);
label_text[0] = 0;
}
int ChordEngine::finger(int f){
return string[f];
}
#define BREAK (401)
void ChordEngine::calculate(){
sprintf(label_text, "%s %s %s%s",
notes[base_note],
(chord_type)?keys[chord_type]:"",
(fret_pos==OPEN)?"":"fret-",
(fret_pos)?frets[fret_pos]:"");
string[0] =
string[1] =
string[2] =
string[3] =
string[4] =
string[5] = MUTED;
for (int in=0;in<6;in++){
notename[in]=0;
}
js_tunit(tuning);
// js_MMM[0] = 4;
//js_MMM[1] = 9;
//js_MMM[2] = 2;
//js_MMM[3] = 7;
//js_MMM[4] = 11;
//js_MMM[5] = 4;
int js_D = base_note;
int js_Q = span_size;
js_Q += 2;
int js_V = variation;
int js_FR = fret_pos;
int js_G = 0;
int js_A = 0;
if (js_FR){
js_G = 8;
}
js_L = 1;
js_Y = 1;
js_Z = 1;
js_vboy(variation);
js_Y += js_Q;
int js_K = 0;
int js_W = js_D - js_Z;
int js_H = -js_Z;
int js_N[6] = {0, 0, 0, 0, 0, 0};
int js_TCK[12] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
int js_E = 0;
int js_X = 0;
for (int j=0; j<41; j++){
js_A = 0;
for (int b=0; b<7; b++){
if (js_N[b] == 1){
js_A++;
}
if ((js_A==6)||(j>39)){
for (int i=0; i<12; i++){
if (js_TCK[i] != js_T[i]){
memset((void *)js_N, 0, 6*sizeof(int));
memset((void *)js_TCK, 0, 12*sizeof(int));
js_V++;
js_X++;
if (js_V>23){
js_V = 0;
}
js_vboy(js_V);
j = 0;
i = BREAK;
b = BREAK;
if (js_X > 23){
js_N[0] = js_N[1] = js_N[2] = js_N[3] = js_N[4] = js_N[5] = 1;
j = BREAK;
}
}
}
}
}
int js_S = 0;
js_W = (js_W + js_Z)%12;
js_H = (js_H + js_Z)%12;
while (js_S < js_Y){
js_S++;
if (js_E > js_Q){
js_E = 0;
js_K = (js_K + js_L)%6;
}
if (js_E<0){
js_E = js_Q;
js_K = (js_K + js_L)%6;
}
if (js_T[js_H] == 0){
for (int c=0;c<13;c++){
js_W = (js_W+js_Z)%12;
js_H = (js_H+js_Z)%12;
if (js_T[js_H] == 1){
c=BREAK;
}
}
}
if (js_N[js_K] == 1){
for(int b=0; b<7; b++){
js_K = (js_K+js_L)%6;
if(js_N[js_K] == 0){
b = BREAK;
}
if(b==6){
js_S = BREAK;
}
}
}
// js_K is the index of the string
// js_MMM is the base note played by that string in the current tuning
// js_FR is the fret position
// js_E
// js_F represents the note made by this string here
// js_N[] records if we have found a finger position for this string
// js_W - represents the note we want????
int js_F = (js_MMM[js_K]+js_E+js_FR)%12;
if ((js_W==js_F)&&(js_N[js_K]==0)){
int js_EG = js_E+js_G;
string[js_K] = js_EG;
notename[js_K] = notes[js_W];
js_N[js_K] = 1;
js_TCK[js_H] = 1;
js_S = BREAK;
}
js_E += js_VM;
}
}
}
const int ChordEngine::alt_tunings[][6] = {
{4, 9,2,7,11,4},
{4,11,4,8,11,4},
{4, 9,4,9, 1,4},
{4, 9,2,6,11,4},
{4, 9,2,7, 0,5},
{2, 9,2,7, 9,2},
{2, 7,0,7, 0,2},
{2, 9,2,6, 9,2},
{2, 9,2,7,11,4},
{2, 7,2,7,11,2},
{2, 9,2,9, 0,2},
{0, 7,0,7, 9,4},
{5, 9,2,7,11,4},
{7,10,2,7,10,2},
};
void ChordEngine::js_tunit(int t){
int max=0;
int octave=0;
for (int i=0;i<6;i++){
js_MMM[i] = ChordEngine::alt_tunings[t][i];
if (js_MMM[i] < max){
octave += 12;
}
max = js_MMM[i];
note_indices[i] = octave + js_MMM[i];
}
}
const int ChordEngine::chordbases[][12] = {
{1,0,0,0,1,0,0,1,0,0,0,0}, // maj
{1,0,0,1,0,0,0,1,0,0,0,0}, // min
{1,0,0,0,1,0,0,1,0,0,1,0}, // 7th
{1,0,0,1,0,0,0,1,0,0,1,0}, // m7
{1,0,0,0,1,0,0,1,0,0,0,1}, // maj7
{1,0,0,0,1,0,0,1,0,1,0,0}, // 6th
{1,0,0,1,0,0,0,1,0,1,0,0}, // m6th
{1,0,0,0,1,0,0,0,1,0,0,0}, // aug
{1,0,0,1,0,0,1,0,0,1,0,0}, // dim
{1,0,0,0,0,1,0,1,0,0,0,0}, // sus4
{1,0,0,0,0,1,0,1,0,0,1,0}, // 7sus4
{1,0,1,0,1,0,0,1,0,0,1,0}, // 9th
{1,0,1,0,1,0,0,1,0,0,0,0}, // add9
{1,0,1,1,0,0,0,1,0,0,1,0}, // m9th
{1,1,0,0,1,0,0,1,0,0,0,1}, // maj9
{1,0,1,0,0,0,0,1,0,0,0,0}, // sus2
{1,0,1,0,0,0,0,1,0,0,1,0}, // 7sus2
{1,0,1,0,0,1,0,1,0,0,1,0}, // 11th
{1,0,1,1,0,1,0,1,0,0,1,0}, // m11th
{1,0,0,0,1,0,0,1,0,1,1,0}, // 13th
{1,0,0,1,0,0,0,1,0,1,1,0}, // m13th
{1,0,0,1,0,0,0,1,0,1,0,1}, // maj13
{1,0,1,0,1,0,0,1,0,1,0,0}, // 6/9
{1,0,0,0,1,0,1,0,0,0,0,0}, // flat5
{1,0,0,1,1,0,0,0,0,0,1,0}, // 7#9
{1,0,0,1,0,0,1,0,0,0,1,0}, // Ø7
{1,0,0,0,0,0,0,1,0,0,0,0}, // 5
};
void ChordEngine::js_whatchord(int c){
for (int i=0;i<12;i++){
js_T[i] = ChordEngine::chordbases[c][i];
}
}
void ChordEngine::js_vboy(int v){
js_L = ((v/3)%2)?5:1;
js_Y = ((v/6)%2)?45:4;
js_Z = (v%3 == 0)?1:(v%3 == 1)?7:11;
js_VM = ((v/12)%2)?-1:1;
}
const char* ChordEngine::notes[] = {"C", "C#", "D", "Eb", "E", "F", "F#", "G", "G#", "A", "Bb", "B", 0};
const char* ChordEngine::keys[] = {"maj", "min", "7th", "m7", "maj7", "6th", "m6th", "aug", "dim", "sus4", "7sus4", "9th", "add9", "m9th", "maj9", "sus2", "7sus2", "11th", "m11th", "13th", "m13th", "maj13", "6|9", "flat5", "7#9", "Ø7", "5", 0};
const char* ChordEngine::frets[] = {"open", "1st", "2nd", "3rd", "4th", "5th", "6th", "7th", "8th", "9th", "10th", "11th", "12th", "13th", "14th", "15th", "16th", 0};
const char* ChordEngine::variations[] = {"V1", "V2", "V3", "V4", "V5", "V6", "V7", "V8", "V9", "V10", "V11", "V12", "V13", "V14", "V15", "V16", "V17", "V18", "V19", "V20", "V21", "V22", "V23", 0};
const char* ChordEngine::tunings[] = {"EADGBE", "EBEG#BE", "EAEAC#E", "EADF#BE", "EADGCF", "DADGAD", "DGCGCD", "DADF#AD", "DADGBE", "DGDGBD", "DADACD", "CGCGAE", "FADGBE", "Gminor",0};
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