/// <summary>
/// Calculates slur height trying to avoid collisions with stems
/// </summary>
/// <param name="note"></param>
/// <param name="endPoint"></param>
/// <returns></returns>
private double DetermineSlurHeight(Note note, Slur slur, SlurInfo slurStartInfo, Point endPoint)
{
var notesUnderSlur = note.Staff.EnumerateUntilConditionMet <Note>(note, n => n.Slurs.FirstOrDefault(s => s.Number == slur.Number)?.Type == NoteSlurType.Start, true).ToArray();
if (notesUnderSlur.Length < 3)
{
return(10);
}
var notesUnderSlurExclusive = notesUnderSlur.Take(notesUnderSlur.Length - 1).Skip(1);
var mostExtremePoint = GetMostExtremePoint(notesUnderSlurExclusive, slurStartInfo.StartPlacement);
var angle = UsefulMath.BeamAngle(slurStartInfo.StartPoint.X, slurStartInfo.StartPoint.Y, endPoint.X, endPoint.Y);
var slurYPositionInMostExtremePoint = slurStartInfo.StartPoint.TranslateHorizontallyAndMaintainAngle(angle, mostExtremePoint.X - slurStartInfo.StartPoint.X).Y;
var mostExtremeYPosition = mostExtremePoint.Y;
if (slurStartInfo.StartPlacement == VerticalPlacement.Above && mostExtremeYPosition < slurYPositionInMostExtremePoint)
{
return(Math.Abs(mostExtremeYPosition - slurYPositionInMostExtremePoint) + 10);
}
if (slurStartInfo.StartPlacement == VerticalPlacement.Below && mostExtremeYPosition > slurYPositionInMostExtremePoint)
{
return(Math.Abs(slurYPositionInMostExtremePoint - mostExtremeYPosition) + 10);
}
return(10);
}
private static Tuple <Point, Point> GetBezierControlPoints(Point start, Point end, VerticalPlacement placement, double height)
{
var factor = placement == VerticalPlacement.Above ? -1 : 1;
var angle = UsefulMath.BeamAngle(start.X, start.Y, end.X, end.Y);
var angle2 = angle + (Math.PI / 2) * factor;
var distance = Point.Distance(start, end);
var startPointForControlPoints = start.TranslateByAngleOld(angle2, height);
var control1 = startPointForControlPoints.TranslateByAngleOld(angle, distance * 0.25);
var control2 = startPointForControlPoints.TranslateByAngleOld(angle, distance * 0.75);
return(new Tuple <Point, Point>(control1, control2));
}
/// <summary>
/// Calculates beam angle
/// </summary>
/// <param name="beamStart">Beam start position</param>
/// <param name="beamEnd">Beam end position</param>
/// <returns></returns>
public static double BeamAngle(Point beamStart, Point beamEnd)
{
return(UsefulMath.BeamAngle(beamStart.X, beamStart.Y, beamEnd.X, beamEnd.Y));
}