Hi,
Have a function that turns text of a guitar chord diagram into the notes it
is composed of. Would like to get/make a plug-in that puts these notes as a
chord of selected duration into a music score.
Do you have example script of how to put a note of selected duration on a
score?
#include <vector>
#include <valarray>
//---------------------------------------------------------------------------
/*
For standard guitar tuning EADGBE, this function calculates the
guitar notes used in a guitar chord.
Guitar chord diagrams input as text with fret numbers
seperated by commas [no spaces].
In same order as the EADGBE strings. All six strings must be present in
input
Note: "0" is open string; "1" is fret 1 etc; "X" or "-" is string not used.
eg "A" chord can be input as "-,0,2,2,2,0"
produces "-0; A3; E4; A4; C#/Db5; E5; "
eg "Bm" chord can be input as "X,2,4,4,3,2"
produces "-0; B3; F#/Gb4; B4; D5; F#/Gb5; "
4,9,2,7,11,4 & 3,3,4,4,4,5 numbers below are standard open string guitar
tuning
these numbers could be easily changed for say DGDGBE guitar tunings etc
*/
void __fastcall TMain_frm::Go_cmdClick(TObject *Sender)
{
// Set up full octave note text in a vector C to B then can index into
it.
std::vector<AnsiString> Note_Table(12);
Note_Table[0] = "C";
Note_Table[1] = "C#/Db";
Note_Table[2] = "D";
Note_Table[3] = "D#/Eb";
Note_Table[4] = "E";
Note_Table[5] = "F";
Note_Table[6] = "F#/Gb";
Note_Table[7] = "G";
Note_Table[8] = "G#/Ab";
Note_Table[9] = "A";
Note_Table[10] = "A#/Bb";
Note_Table[11] = "B";
// Set up index matrix - "index" of open string in the Note_Table
std::valarray<int> Open_String_Index(6);
Open_String_Index[0] = 4;
Open_String_Index[1] = 9;
Open_String_Index[2] = 2;
Open_String_Index[3] = 7;
Open_String_Index[4] = 11;
Open_String_Index[5] = 4;
// music staff octave # of the open string guitar notes. Middle C as
C4.
std::valarray<int> Open_String_Octave(6);
Open_String_Octave[0] = 3;
Open_String_Octave[1] = 3;
Open_String_Octave[2] = 4;
Open_String_Octave[3] = 4;
Open_String_Octave[4] = 4;
Open_String_Octave[5] = 5;
// Array frets(6) splits input string into a vector at the commas.
// Allows for single 0-9 and double 10+ digits. Can't handle 01, 02!
std::vector<AnsiString> frets(6);
AnsiString sixStr = Input_edit->Text; // eg "X,2,4,4,3,2"
int cp = 1;
for (int i = 0; i < 5; i++)
{
if(sixStr.SubString(cp+1,1)==",")
{
frets[i] = sixStr.SubString(cp,1);
cp += 2;
}
else
{
frets[i] = sixStr.SubString(cp,2);
cp += 3;
}
}
frets[5] = sixStr.SubString(cp,sixStr.Length()-cp+1);
// Functions defined to calculate the music staff notes Notes(6),
// and octaves Octaves(6) of these six guitar fret positions.
// Handles "X" or "-" for strings not used.
// All six strings must be present in input text.
std::vector<AnsiString> Notes(6);
for (int i = 0; i < 6; i++)
{
if((frets[i]=="X")||(frets[i]=="-"))
{
Notes[i] = "-";
}
else
{
Notes[i] =
Note_Table[div(frets[i].ToInt()+Open_String_Index[i],12).rem];
}
}
std::valarray<int> Octaves(6);
for (int i = 0; i < 6; i++)
{
if((frets[i]=="X")||(frets[i]=="-"))
{
Octaves[i] = 0;
}
else
{
Octaves[i] = Open_String_Octave[i] +
(div(frets[i].ToInt()+Open_String_Index[i],12).quot);
}
}
// Assemble these calculated notes and octaves back into a full string
// seperated by semi-colons ";" and then display it
AnsiString out = "";
for (int i = 0; i < 6; i++)
{
out = out + Notes[i] + Octaves[i] + "; ";
}
Output_edit->Text = out; // eg "X,2,4,4,3,2" becomes "-0; B3; F#/Gb4;
B4; D5; F#/Gb5; "
}
//---------------------------------------------------------------------------
--
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