private double GetStartingValue(EnvelopeCore.StepCollection coll)
{
double startingValue = 0;
if (coll.Phase == EnvelopePhase.Loop)
{
if (coll.ParentEnvelope.Attack.Any())
{
startingValue = coll.ParentEnvelope.Attack.Last().TargetValue;
}
else
{
startingValue = 1;
}
}
else if (coll.Phase == EnvelopePhase.Release)
{
if (coll.ParentEnvelope.Loop.Any())
{
startingValue = coll.ParentEnvelope.Loop.Last().TargetValue;
}
else if (coll.ParentEnvelope.Attack.Any())
{
startingValue = coll.ParentEnvelope.Attack.Last().TargetValue;
}
else
{
startingValue = 1;
}
}
return(startingValue);
}
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
if (value == null)
{
return(null);
}
if (!(value is EnvelopeCore.StepCollection))
{
throw new ArgumentException("EnvPhaseToGeometryConverter requires a value of type StepCollection");
}
double totalSeconds = 0;
EnvelopeCore.StepCollection coll = value as EnvelopeCore.StepCollection;
Point[] points = coll.Select(s => new Point(totalSeconds += s.Seconds, 1 - s.TargetValue)).ToArray();
double startingValue = GetStartingValue(coll);
// The units don't matter here -- just that the projection is independently proportional on each axis.
// For display, the path objects of related stepcollections eill need to have the same scaling as each other to line up correctly.
PathFigure figure = new PathFigure();
figure.StartPoint = new Point(0, 1 - startingValue);
if (coll.Any())
{
points.Execute(p => figure.Segments.Add(new LineSegment(p, true)));
if (coll.Phase == EnvelopePhase.Release && coll.Last().TargetValue != 0)
{
figure.Segments.Add(new LineSegment(new Point(totalSeconds, 1), true));
}
AddFrame(figure, coll.TotalSeconds);
}
else if (coll.Phase == EnvelopePhase.Loop)
{
figure.Segments.Add(new LineSegment(new Point(coll.TotalSeconds, 1 - startingValue), true));
AddFrame(figure, coll.TotalSeconds);
}
PathGeometry geo = new PathGeometry();
geo.Figures.Add(figure);
geo.Freeze();
return(geo);
}
