PianoKey InstantiateKey(PianoKey pianoKeyPrefab)
{
var key = Instantiate(pianoKeyPrefab) as PianoKey;
return(key);
}
/// <summary>
/// build a keyboard
/// </summary>
/// <param name = "numKeys"> number of keys of a keyboard </param>
/// <param name = "offset"> number of keys before the first Do. e.g. 3 if the most left key is La. </param>
/// <param name = "startNoteNumber"> the first note number which used to take an input from MidiMaster. </param>
void BuildKeyboard(int numKeys, int offset, int startNoteNumber)
{
_keys.Clear();
// todo destroy old keys
// initialize transform before building a keyboard
transform.localScale = Vector3.one;
transform.SetPositionAndRotation(Vector3.zero, Quaternion.identity);
var octaveLength = PianoUtility.NumKeysInOctave;
var startKeyIndex = octaveLength - offset;
var numWhiteKeys = 0;
var numTotalWhiteKeys = 0;
for (var i = 0; i < numKeys; i++)
{
var keyColor = PianoUtility.GetPianoKeyColor(startKeyIndex + i);
if (keyColor == PianoKeyColor.White)
{
numTotalWhiteKeys++;
}
}
PianoKey firstKey = null;
var sumWhiteKeyWidths = 0f;
for (var i = 0; i < numKeys; i++)
{
var noteNumber = startNoteNumber + i;
if (noteNumber >= NoteLength)
{
break;
}
var keyColor = PianoUtility.GetPianoKeyColor(startKeyIndex + i);
if (i == 0 && keyColor != PianoKeyColor.White)
{
Debug.LogAssertion("The first key should be white in order to calculate black keys' position and scale properly.");
}
PianoKey key;
switch (keyColor)
{
case PianoKeyColor.White:
key = InstantiateKey(_whiteKeyPrefab);
break;
case PianoKeyColor.Black:
key = InstantiateKey(_blackKeyPrafab);
break;
default:
throw new ArgumentException();
}
if (i == 0)
{
firstKey = key;
}
key.NoteNumber = noteNumber;
key.transform.SetParent(this.transform);
// make it sure that it is the unit scale.
key.transform.localScale = Vector3.one;
float posX, posY;
if (keyColor == PianoKeyColor.White)
{
posX = (key.KeyCollider.bounds.size.x + _spaceBtwKeys) * numWhiteKeys + key.PositionOffset.x + _keyboardWidthOffset;
posY = key.PositionOffset.y + _keyboardHeightOffset;
sumWhiteKeyWidths += key.KeyCollider.bounds.size.x + _spaceBtwKeys;
}
else
{
posX = (firstKey.KeyCollider.bounds.size.x + _spaceBtwKeys) * numWhiteKeys + key.PositionOffset.x + _keyboardWidthOffset - key.KeyCollider.bounds.size.x / 2.0f - _spaceBtwKeys / 2.0f;
posY = key.PositionOffset.y + _keyboardHeightOffset + firstKey.KeyCollider.bounds.size.y - key.KeyCollider.bounds.size.y;
}
key.transform.position = new Vector3(posX, posY, 0f);
key.transform.SetParent(this.transform);
_keys.Add(noteNumber, key);
if (keyColor == PianoKeyColor.White)
{
numWhiteKeys++;
}
}
// scale keyboard so it fits screen
var scaleMultiplierX = _screenIndicator.Width / (sumWhiteKeyWidths + _keyboardWidthOffset * 2);
var keyHeight = _screenIndicator.Height / 5.0f;
var scaleMultiplierY = keyHeight / firstKey.KeyCollider.bounds.size.y;
var keyboardScale = transform.localScale;
keyboardScale.x *= scaleMultiplierX;
keyboardScale.y *= scaleMultiplierY;
this.transform.localScale = keyboardScale;
// locate keyboard
var keyboardPosX = _screenIndicator.Center.x - _screenIndicator.Width / 2.0f;
var keyboardPosY = _screenIndicator.Center.y - _screenIndicator.Height / 2.0f;
this.transform.position = new Vector3(keyboardPosX, keyboardPosY, 0f);
// finally set keyboard's parent to screen indicator
this.transform.SetParent(_screenIndicator.transform);
_onBuildKeyboard.OnNext(Unit.Default);
}
void Awake()
{
_key = GetComponent <PianoKey>();
}