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/*
* Modification History
*
* 2004-August-22 Jason Rohrer
* Created.
*
* 2004-August-26 Jason Rohrer
* Added parameter to control character of part.
*/
#include "MusicPart.h"
#include "LevelDirectoryManager.h"
#include <math.h>
MusicPart::MusicPart( MusicNoteWaveTable *inWaveTable,
RandomSource *inRandSource,
double inParameter )
: mWaveTable( inWaveTable ),
mNotes( new SimpleVector<MusicNote *>() ) {
int frequencyCount = inWaveTable->getFrequencyCount();
int lengthCount = inWaveTable->getLengthCount();
char error= false;
double musicChanceOfReversedNote =
LevelDirectoryManager::readDoubleFileContents(
"musicChanceOfReversedNote", &error, true );
if( error ) {
// default to all notes playing forward
musicChanceOfReversedNote = 0.0;
}
error = false;
double musicPartLength =
LevelDirectoryManager::readDoubleFileContents(
"musicPartLength", &error, true );
if( error ) {
// default to 10 second parts
musicPartLength = 10.0;
}
// populate our note vector with randomized notes, all of the same length
// decide note length using our parameter
int lengthIndex = (int)( rint( inParameter * ( lengthCount - 1 ) ) );
double totalLength = 0;
while( totalLength < musicPartLength ) {
// add another note
int frequencyIndex =
inRandSource->getRandomBoundedInt( 0, frequencyCount - 1 );
char noteReversed;
// flip a weighted coin to determine if this note should be played
// in reverse
if( inRandSource->getRandomDouble() < musicChanceOfReversedNote ) {
noteReversed = true;
}
else {
noteReversed = false;
}
mNotes->push_back(
new MusicNote( frequencyIndex, lengthIndex, noteReversed ) );
// add this note's length to our total
totalLength += inWaveTable->getLengthInSeconds( lengthIndex );
}
// note lengths sum to a total length that may be beyond the limit
if( totalLength > musicPartLength ) {
// drop the last note
int lastNoteIndex = mNotes->size() - 1;
delete *( mNotes->getElement( lastNoteIndex ) );
mNotes->deleteElement( lastNoteIndex );
// could do something more intelligent here...
// like drop the note that results in a total length that
// is closest to the musicPartLength
}
}
MusicPart::~MusicPart() {
int numNotes = mNotes->size();
for( int i=0; i<numNotes; i++ ) {
delete *( mNotes->getElement( i ) );
}
delete mNotes;
}
double MusicPart::getPartLengthInSeconds() {
return mPartLengthInSeconds;
}
int MusicPart::getNotesStartingInInterval(
double inStartTimeInSeconds,
double inLengthInSeconds,
MusicNote ***outNotes,
double **outNoteStartOffsetsInSeconds ) {
SimpleVector<MusicNote*> *returnNotes = new SimpleVector<MusicNote*>();
SimpleVector<double> *returnStartOffsets = new SimpleVector<double>();
double endTimeInSeconds = inStartTimeInSeconds + inLengthInSeconds;
// walk through notes looking for those that start in the interval
int numNotes = mNotes->size();
double currentNoteStartTime = 0;
for( int i=0;
i<numNotes && currentNoteStartTime <= endTimeInSeconds;
i++ ) {
MusicNote *note = *( mNotes->getElement( i ) );
double noteLength =
mWaveTable->getLengthInSeconds( note->mLengthIndex );
if( currentNoteStartTime >= inStartTimeInSeconds ) {
// add the note
returnNotes->push_back( note->copy() );
returnStartOffsets->push_back(
currentNoteStartTime - inStartTimeInSeconds );
}
// else skip the note
currentNoteStartTime += noteLength;
}
int numNotesReturned = returnNotes->size();
*outNotes = returnNotes->getElementArray();
*outNoteStartOffsetsInSeconds = returnStartOffsets->getElementArray();
delete returnNotes;
delete returnStartOffsets;
return numNotesReturned;
}
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