//Paint Events
public void PaintEvents(PaintEventArgs e)
{
//Get a copy of currentMidiObjects Events
MidiEvent[] CurrentMidiEvents = new MidiEvent[0];
Array.Resize(ref CurrentMidiEvents, CurrentMidiObject.Track.Events.Length);
Array.Copy(CurrentMidiObject.Track.Events, CurrentMidiEvents, CurrentMidiObject.Track.Events.Length);
if (CurrentMidiEvents != null && CurrentMidiEvents.Length > 0 && CurrentMidiEvents[0] != null)
{
MidiEvent CurrentEvent = null;
for (int EventIndex = 0; EventIndex <= CurrentMidiEvents.Length - 1; EventIndex++)
{
CurrentEvent = CurrentMidiEvents[EventIndex];
//Paint Tempo Events : Paint all TempoEvents before NoteDown Events, for depth
if (CurrentEvent is TempoMidiEvent)
{
TempoMidiEvent CurrentTempoEvent = (TempoMidiEvent)CurrentEvent;
e.Graphics.FillRectangle(Brushes.Yellow, (CurrentTempoEvent.CellPosition * CellWidth) + (CellWidth / 2), 0, (CellWidth / 2), ROWCOUNT * CellHeight);
}
//Paint InstrumentEvents : Paint all InstrumentEvents before NoteDown Events, for depth
if (CurrentEvent is InstrumentMidiEvent)
{
InstrumentMidiEvent CurrentTempoEvent = (InstrumentMidiEvent)CurrentEvent;
e.Graphics.FillRectangle(Brushes.Red, (CurrentTempoEvent.CellPosition * CellWidth), 0, (CellWidth / 2), ROWCOUNT * CellHeight);
}
}
//for each Note
for (int EventIndex = 0; EventIndex <= CurrentMidiEvents.Length - 1; EventIndex++)
{
CurrentEvent = CurrentMidiEvents[EventIndex];
//Paint note events
if (CurrentEvent.Type == NOTE_DOWN)
{
//Paint notes
e.Graphics.FillRectangle(NoteFill, CurrentEvent.CellPosition * CellWidth, (127 - CurrentEvent.Paramater1) * CellHeight, CurrentEvent.Length * CellWidth, CellHeight);
e.Graphics.DrawRectangle(NoteOutline, CurrentEvent.CellPosition * CellWidth, (127 - CurrentEvent.Paramater1) * CellHeight, CurrentEvent.Length * CellWidth, CellHeight);
}
}
//for each selected note
if (SelectedEvents != null && SelectedEvents.Length > 0 && SelectedEvents[0] != null)
{
for (int EventIndex = 0; EventIndex <= SelectedEvents.Length - 1; EventIndex++)
{
CurrentEvent = SelectedEvents[EventIndex];
//Paint note events
if (CurrentEvent.Type == NOTE_DOWN)
{
//Paint notes
e.Graphics.FillRectangle(Brushes.Red, CurrentEvent.CellPosition * CellWidth, (127 - CurrentEvent.Paramater1) * CellHeight, CurrentEvent.Length * CellWidth, CellHeight);
e.Graphics.DrawRectangle(Pens.Black, CurrentEvent.CellPosition * CellWidth, (127 - CurrentEvent.Paramater1) * CellHeight, CurrentEvent.Length * CellWidth, CellHeight);
}
}
}
e.Dispose();
}
}
//Validate Instrument event, to avoid overlapping
public Boolean ValidateInstrumentPlacement(MidiEvent[] CurrentMidiEvents, MidiEvent CurrentEvent)
{
//Caste current event to TempoEvent
InstrumentMidiEvent CurrentTempoEvent = (InstrumentMidiEvent)CurrentEvent;
//If there are no events at the moment, return true
if (CurrentMidiEvents.Length == 0 || CurrentMidiEvents[0] == null)
{
return(true);
}
for (int i = 0; i < CurrentMidiEvents.Length; i++)
{
//for each event that is a InstrumentMidiEvent, check for overlapping location
if (CurrentMidiEvents[i] is InstrumentMidiEvent &&
CurrentMidiEvents[i].CellPosition == CurrentTempoEvent.CellPosition)
{
//if there is an overlap, return false. Event will not be placed
return(false);
}
}
//If there is no instrument event here, return true
return(true);
}
//Determine the Instrument number at a certain cell
public byte InstrumentAtPosition(int MyCellPosition)
{
byte Instrument = 0;
//Get a copy of currentMidiObjects Events
MidiEvent[] CurrentMidiEvents = new MidiEvent[0];
Array.Resize(ref CurrentMidiEvents, CurrentMidiObject.Track.Events.Length);
Array.Copy(CurrentMidiObject.Track.Events, CurrentMidiEvents, CurrentMidiObject.Track.Events.Length);
//check each event
for (int EventIndex = 0; EventIndex < CurrentMidiEvents.Length; EventIndex++)
{
//Update Current Instrument, to be the Instrument closest to the mouseposition, but still to the left(time)
if (CurrentMidiEvents[EventIndex] is InstrumentMidiEvent && CurrentMidiEvents[EventIndex].CellPosition <= MyCellPosition)
{
InstrumentMidiEvent CurrentInstrumentEvent = (InstrumentMidiEvent)CurrentMidiEvents[EventIndex];
//Parameter1 Holds the Instrument value
Instrument = (CurrentInstrumentEvent.Paramater1);
}
}
//If no Instrument event is found, midi assumes instrument 0, Acoustice Grand Piano
return(Instrument);
}
//Generate Midi Event Bytes, Calculate Delta times in bytes.
public void GenerateMidiEventByteArray(MidiEvent[] MidiEventArray)
{
int ByteIndex = 0;
for (int EventIndex = 0; EventIndex <= MidiEventArray.Length - 1; EventIndex++)
{
//Convert Delta times to Big-Endian bytes (max 4 bytes)
if ((MidiEventArray[EventIndex].Delta >> SEVENSHIFT * 3) > 0)
{
Array.Resize(ref TrackChunkBytes, ByteIndex + 1);
TrackChunkBytes[ByteIndex] = Convert.ToByte(128 | (MidiEventArray[EventIndex].Delta >> SEVENSHIFT * 3));
ByteIndex += 1;
}
if ((MidiEventArray[EventIndex].Delta >> SEVENSHIFT * 2) > 0)
{
Array.Resize(ref TrackChunkBytes, ByteIndex + 1);
TrackChunkBytes[ByteIndex] = Convert.ToByte(128 | (MidiEventArray[EventIndex].Delta >> SEVENSHIFT * 2));
ByteIndex += 1;
}
if ((MidiEventArray[EventIndex].Delta >> SEVENSHIFT) > 0)
{
Array.Resize(ref TrackChunkBytes, ByteIndex + 1);
TrackChunkBytes[ByteIndex] = Convert.ToByte(128 | MidiEventArray[EventIndex].Delta >> SEVENSHIFT);
ByteIndex += 1;
}
//Final byte Delta Time
Array.Resize(ref TrackChunkBytes, ByteIndex + 1);
TrackChunkBytes[ByteIndex] = Convert.ToByte(127 & (MidiEventArray[EventIndex].Delta));
ByteIndex += 1;
//Decide how to write event data
if (MidiEventArray[EventIndex] is TempoMidiEvent)
{
//Caste Event
TempoMidiEvent CurrentTempoEvent = (TempoMidiEvent)MidiEventArray[EventIndex];
//Meta Event Number
Array.Resize(ref TrackChunkBytes, ByteIndex + 1);
TrackChunkBytes[ByteIndex] = CurrentTempoEvent.MetaEventNumber;
ByteIndex += 1;
//Meta Event Type
Array.Resize(ref TrackChunkBytes, ByteIndex + 1);
TrackChunkBytes[ByteIndex] = CurrentTempoEvent.MetaEventType;
ByteIndex += 1;
//Meta Event Data Length
Array.Resize(ref TrackChunkBytes, ByteIndex + 1);
TrackChunkBytes[ByteIndex] = CurrentTempoEvent.MetaEventDataLength;
ByteIndex += 1;
//Quarter Note Time
Array.Resize(ref TrackChunkBytes, ByteIndex + 1);
TrackChunkBytes[ByteIndex] = Convert.ToByte(255 & (CurrentTempoEvent.QuarterNoteTime >> 16));
ByteIndex += 1;
//Quarter Note Time
Array.Resize(ref TrackChunkBytes, ByteIndex + 1);
TrackChunkBytes[ByteIndex] = Convert.ToByte(255 & (CurrentTempoEvent.QuarterNoteTime >> 8));
ByteIndex += 1;
//Quarter Note Time
Array.Resize(ref TrackChunkBytes, ByteIndex + 1);
TrackChunkBytes[ByteIndex] = Convert.ToByte(255 & (CurrentTempoEvent.QuarterNoteTime));
ByteIndex += 1;
}
else if (MidiEventArray[EventIndex] is InstrumentMidiEvent)
{
//Caste Event
InstrumentMidiEvent CurrentTempoEvent = (InstrumentMidiEvent)MidiEventArray[EventIndex];
//Instrument Event Number :channel default zero
Array.Resize(ref TrackChunkBytes, ByteIndex + 1);
TrackChunkBytes[ByteIndex] = Convert.ToByte(CurrentTempoEvent.Type << 4);
ByteIndex += 1;
//Meta Event Type
Array.Resize(ref TrackChunkBytes, ByteIndex + 1);
TrackChunkBytes[ByteIndex] = CurrentTempoEvent.Paramater1;
ByteIndex += 1;
}
else
{
//Event Type & Channel(Zero) TODO:This defaults channel to zero always
Array.Resize(ref TrackChunkBytes, ByteIndex + 1);
TrackChunkBytes[ByteIndex] = Convert.ToByte(MidiEventArray[EventIndex].Type << 4);
ByteIndex += 1;
//Param1
Array.Resize(ref TrackChunkBytes, ByteIndex + 1);
TrackChunkBytes[ByteIndex] = MidiEventArray[EventIndex].Paramater1;
ByteIndex += 1;
//Param2
Array.Resize(ref TrackChunkBytes, ByteIndex + 1);
TrackChunkBytes[ByteIndex] = MidiEventArray[EventIndex].Paramater2;
ByteIndex += 1;
}
}
//Add end of Track Event
Array.Resize(ref TrackChunkBytes, ByteIndex + 6);
TrackChunkBytes[ByteIndex] = EndOfTrack[0];
ByteIndex += 1;
TrackChunkBytes[ByteIndex] = EndOfTrack[1];
ByteIndex += 1;
TrackChunkBytes[ByteIndex] = EndOfTrack[2];
ByteIndex += 1;
TrackChunkBytes[ByteIndex] = EndOfTrack[3];
ByteIndex += 1;
TrackChunkBytes[ByteIndex] = EndOfTrack[4];
ByteIndex += 1;
TrackChunkBytes[ByteIndex] = EndOfTrack[5];
}
//Create TrackChunk Object from Array of Bytes
public void TrackChunkFromBytes(byte[] TrackBytes)
{
//MidiEvent
int Delta = 0;
sbyte EventType;
sbyte MidiChannel;
byte Param1;
byte Param2;
//TempoEvent
int MicroSecondsPerQuarterNote = 1;
//InstrumentEvent
byte InstrumentNumber = 1;
MidiEvent[] OpenedEvents = new MidiEvent[1];
Boolean DeltaRetrieved = false;
int NextEventIndex = 0;
byte NextByteValue;
for (int ByteIndex = TRACKHEADERLENGTH; ByteIndex < TrackBytes.Length - 1; ByteIndex++)
{
Delta = 0;
while (!(DeltaRetrieved))
{
NextByteValue = TrackBytes[ByteIndex];
if ((NextByteValue) >= 128)
{
Delta = NextByteValue & 127;
Delta = Delta << SHIFT;
}
else
{
Delta = Delta | NextByteValue;
DeltaRetrieved = true;
}
ByteIndex++;
}
DeltaRetrieved = false;
NextByteValue = TrackBytes[ByteIndex];
//If its a Meta Event
if (NextByteValue == 0xff)
{
ByteIndex++;
NextByteValue = TrackBytes[ByteIndex];
if ((NextByteValue == 0x2F))
{
//EOT found
break;
}
ByteIndex++;
NextByteValue = TrackBytes[ByteIndex];
ByteIndex++;
MicroSecondsPerQuarterNote = TrackBytes[ByteIndex] << 8;
ByteIndex++;
MicroSecondsPerQuarterNote = (MicroSecondsPerQuarterNote | TrackBytes[ByteIndex]) << 8;
ByteIndex++;
MicroSecondsPerQuarterNote = (MicroSecondsPerQuarterNote | TrackBytes[ByteIndex]);
if (OpenedEvents[0] == null)
{
}
else
{
Array.Resize(ref OpenedEvents, OpenedEvents.Length + 1);
}
OpenedEvents[NextEventIndex] = new TempoMidiEvent(Delta, MicroSecondsPerQuarterNote);
NextEventIndex++;
}
//if its an instrument change event
else if (NextByteValue == 0xC0)
{
MidiChannel = Convert.ToSByte(0x0f & NextByteValue << 4);
ByteIndex++;
NextByteValue = TrackBytes[ByteIndex];
InstrumentNumber = NextByteValue;
if (OpenedEvents[0] == null)
{
//Do Nothing. Opened events are empty and the first element is free
}
else //Resize the array for the extra event
{
Array.Resize(ref OpenedEvents, OpenedEvents.Length + 1);
}
OpenedEvents[NextEventIndex] = new InstrumentMidiEvent(Delta, 0, MidiChannel, InstrumentNumber);
NextEventIndex++;
}
//Other Midi Event
else
{
EventType = Convert.ToSByte(NextByteValue >> 4);
//No ByteIndex++ because EventType& MidiChannel are stored in same byte
MidiChannel = Convert.ToSByte(NextByteValue & 0xf);
ByteIndex++;
NextByteValue = TrackBytes[ByteIndex];
Param1 = NextByteValue;
ByteIndex++;
NextByteValue = TrackBytes[ByteIndex];
Param2 = NextByteValue;
if (OpenedEvents[0] == null)
{
}
else
{
Array.Resize(ref OpenedEvents, OpenedEvents.Length + 1);
}
OpenedEvents[NextEventIndex] = new MidiEvent(0, 0, Delta, EventType, MidiChannel, Param1, Param2);
NextEventIndex++;
}
}
CalculateScorePositionFromDeltaTimes(OpenedEvents, MidiHeaderChunk.Ticks);
CalculateNoteDownLengths(OpenedEvents);
MidiTrackChunk = new TrackChunk(OpenedEvents);
}
//Remove Instrument/Tempo/Midi Event from CurrentMidi Object
public void DeleteEvent(MidiEvent[] CurrentMidiEvents, MouseEventArgs e)
{
switch (e.Button)
{
case MouseButtons.Left:
for (int EventIndex = 0; EventIndex < CurrentMidiEvents.Length; EventIndex++)
{
#region Search for Note to Delete
if ((CurrentMidiEvents[EventIndex].Type == NOTE_DOWN &&
CurrentMidiEvents[EventIndex].Paramater1 == 127 - CurrentCellYPosition) &&
(CurrentCellXPosition >= CurrentMidiEvents[EventIndex].CellPosition &&
CurrentCellXPosition < CurrentMidiEvents[EventIndex].CellPosition + CurrentMidiEvents[EventIndex].Length))
//if the current Cell is within the bounds of a note
{
for (int NoteUpIndex = EventIndex + 1; NoteUpIndex < (CurrentMidiEvents.Length); NoteUpIndex++)
{
if (CurrentMidiEvents[NoteUpIndex].Type == 0x08 && (CurrentMidiEvents[NoteUpIndex].Paramater1 == CurrentMidiEvents[EventIndex].Paramater1))
{
for (int i = NoteUpIndex; i < CurrentMidiEvents.Length - 1; i++)
{
CurrentMidiEvents[i] = CurrentMidiEvents[i + 1];
}
for (int i = EventIndex; i < CurrentMidiEvents.Length - 2; i++)
{
CurrentMidiEvents[i] = CurrentMidiEvents[i + 1];
}
if (CurrentMidiEvents.Length == 2)
{
Array.Resize(ref CurrentMidiEvents, 0);
}
else
{
Array.Resize(ref CurrentMidiEvents, CurrentMidiEvents.Length - 2);
}
//finish
EventIndex = CurrentMidiEvents.Length;
break;
}
}
}
if (EventIndex == CurrentMidiEvents.Length)
{
break;
}
#endregion
#region Search Instrument Event
if (CurrentMidiEvents[EventIndex] is InstrumentMidiEvent && EventIndex != CurrentMidiEvents.Length)
//if the current Cell is within the bounds of a note
{
InstrumentMidiEvent CurrentInstrumentEvent = (InstrumentMidiEvent)CurrentMidiEvents[EventIndex];
if (CurrentInstrumentEvent.CellPosition == CurrentCellXPosition)
{
for (int i = EventIndex; i < CurrentMidiEvents.Length - 1; i++)
{
CurrentMidiEvents[i] = CurrentMidiEvents[i + 1];
}
if (CurrentMidiEvents.Length == 1)
{
Array.Resize(ref CurrentMidiEvents, 0);
}
else
{
Array.Resize(ref CurrentMidiEvents, CurrentMidiEvents.Length - 1);
}
//finish
EventIndex = CurrentMidiEvents.Length;
break;
}
}
if (EventIndex == CurrentMidiEvents.Length)
{
break;
}
#endregion
}
//Update the Track Events
CurrentMidiObject.Track.Events = CurrentMidiEvents;
break;
case MouseButtons.Right:
for (int EventIndex = 0; EventIndex < CurrentMidiEvents.Length; EventIndex++)
{
#region Search tempo event
if (CurrentMidiEvents[EventIndex] is TempoMidiEvent && EventIndex != CurrentMidiEvents.Length)
//if the current Cell is within the bounds of a note
{
TempoMidiEvent CurrentTempoEvent = (TempoMidiEvent)CurrentMidiEvents[EventIndex];
if (CurrentTempoEvent.CellPosition == CurrentCellXPosition)
{
for (int i = EventIndex; i < CurrentMidiEvents.Length - 1; i++)
{
CurrentMidiEvents[i] = CurrentMidiEvents[i + 1];
}
if (CurrentMidiEvents.Length == 1)
{
Array.Resize(ref CurrentMidiEvents, 0);
}
else
{
Array.Resize(ref CurrentMidiEvents, CurrentMidiEvents.Length - 1);
}
//finish
EventIndex = CurrentMidiEvents.Length;
break;
}
}
if (EventIndex == CurrentMidiEvents.Length)
{
break;
}
#endregion
}
//Update the Track Events
CurrentMidiObject.Track.Events = CurrentMidiEvents;
break;
default:
break;
}
}