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// -*- c-basic-offset: 4 -*-
/*
Rosegarden
A sequencer and musical notation editor.
This program is Copyright 2000-2008
Guillaume Laurent <glaurent@telegraph-road.org>,
Chris Cannam <cannam@all-day-breakfast.com>,
Richard Bown <bownie@bownie.com>
The moral right of the authors to claim authorship of this work
has been asserted.
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. See the file
COPYING included with this distribution for more information.
*/
#ifndef _NOTATION_RULES_H_
#define _NOTATION_RULES_H_
/**
* Common major and minor scales.
*
* For example, sixth note in 12-basis on Cmajor scale:
* scale_Cmajor[5] = 9
*/
static int scale_Cmajor[] = { 0, 2, 4, 5, 7, 9, 11 };
static int scale_Cminor[] = { 0, 2, 3, 5, 7, 8, 10 };
static int scale_Cminor_harmonic[] = { 0, 2, 3, 5, 7, 8, 11 };
/**
* Steps of common major and minor scales.
*
* For example, get accidental in 12-basis on Cmajor scale:
* 10 - scale_Cmajor[steps_Cmajor[10]] = 10 - 9 = +1
*/
static int steps_Cmajor[] = { 0, 0, 1, 1, 2, 3, 3, 4, 4, 5, 5, 6 };
static int steps_Cminor[] = { 0, 0, 1, 2, 2, 3, 3, 4, 5, 5, 6, 6 };
static int steps_Cminor_harmonic[] = { 0, 0, 1, 2, 2, 3, 3, 4, 5, 5, 5, 6 };
/**
* Same as previosly, but the use of accidentals is explicitly written.
*
* For example, get accidental in 12-basis on Cmajor scale:
* 10 - scale_Cmajor[steps_Cmajor_with_sharps[10]] = 10 - 9 = +1
* 10 - scale_Cmajor[steps_Cmajor_with_flats[10]] = 10 - 11 = -1
*/
static int steps_Cmajor_with_sharps[] = { 0, 0, 1, 1, 2, 3, 3, 4, 4, 5, 5, 6 };
static int steps_Cmajor_with_flats[] = { 0, 1, 1, 2, 2, 3, 4, 4, 5, 5, 6, 6 };
namespace Rosegarden
{
/*
* NotationRules.h
*
* This file contains the model for rules which are used in notation decisions.
*
*/
class NotationRules
{
public:
NotationRules() { };
~NotationRules() { };
/**
* If a single note is above the middle line, the preferred direction is up.
*
* If a single note is on the middle line, the preferred direction is down.
*
* If a single note is below the middle line, the preferred direction is down.
*/
bool isStemUp(int heightOnStaff) { return heightOnStaff < 4; }
/**
* If the highest note in a chord is more distant from the middle
* line than the lowest note in a chord, the preferred direction is down.
*
* If the extreme notes in a chord are an equal distance from the
* middle line, the preferred direction is down.
*
* If the lowest note in a chord is more distant from the middle
* line than the highest note in a chord, the preferred direction is up.
*/
bool isStemUp(int highestHeightOnStaff, int lowestHeightOnStaff) {
return (highestHeightOnStaff + lowestHeightOnStaff) < 2*4;
}
/**
* If majority of notes are below the middle line,
* the preferred direction is up.
*
* If notes are equally distributed around the middle line,
* the preferred direction is down.
*
* If majority of notes are above the middle line,
* the preferred direction is down.
*/
bool isBeamAboveWeighted(int weightAbove, int weightBelow) {
return weightBelow > weightAbove;
}
/**
* If the highest note in a group is more distant from the middle
* line than the lowest note in a group, the preferred direction is down.
*
* If the extreme notes in a group are an equal distance from the
* middle line, the preferred direction is down.
*
* If the lowest note in a group is more distant from the middle
* line than the highest note in a group, the preferred direction is up.
*/
bool isBeamAbove(int highestHeightOnStaff, int lowestHeightOnStaff) {
return (highestHeightOnStaff + lowestHeightOnStaff) < 2*4;
}
bool isBeamAbove(int highestHeightOnStaff, int lowestHeightOnStaff,
int weightAbove, int weightBelow) {
if (highestHeightOnStaff + lowestHeightOnStaff == 2*4) {
return isBeamAboveWeighted(weightAbove,weightBelow);
} else {
return isBeamAbove(highestHeightOnStaff,lowestHeightOnStaff);
}
}
};
}
#endif
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