/// <summary>
/// Gets the possible sides for the given label and the given derivative point.
/// </summary>
/// <returns>An enumeration of the possible sides (-1 or 1).</returns>
static double[] GetPossibleSides(Label.PlacementSide side, Point derivative)
{
if (derivative.Length == 0)
{
side = Label.PlacementSide.Any;
}
switch (side)
{
case Label.PlacementSide.Port:
return(new double[] { -1 });
case Label.PlacementSide.Starboard:
return(new double[] { 1 });
case Label.PlacementSide.Top:
if (ApproximateComparer.Close(derivative.X, 0))
{
// If the line is vertical, Top becomes Left
return(GetPossibleSides(Label.PlacementSide.Left, derivative));
}
return(new double[] { derivative.X < 0 ? 1 : -1 });
case Label.PlacementSide.Bottom:
if (ApproximateComparer.Close(derivative.X, 0))
{
// If the line is vertical, Bottom becomes Right
return(GetPossibleSides(Label.PlacementSide.Right, derivative));
}
return(new double[] { derivative.X < 0 ? -1 : 1 });
case Label.PlacementSide.Left:
if (ApproximateComparer.Close(derivative.Y, 0))
{
// If the line is horizontal, Left becomes Top
return(GetPossibleSides(Label.PlacementSide.Top, derivative));
}
return(new double[] { derivative.Y < 0 ? -1 : 1 });
case Label.PlacementSide.Right:
if (ApproximateComparer.Close(derivative.Y, 0))
{
// If the line is horizontal, Right becomes Bottom
return(GetPossibleSides(Label.PlacementSide.Bottom, derivative));
}
return(new double[] { derivative.Y < 0 ? 1 : -1 });
default:
return(new double[] { -1, 1 });
}
}
private static IEnumerable <double> GetPossibleSides(Label.PlacementSide side, Point derivative)
{
MethodInfo methodInfo = typeof(EdgeLabelPlacement).GetMethod("GetPossibleSides", BindingFlags.Static | BindingFlags.NonPublic);
return((IEnumerable <double>)methodInfo.Invoke(null, new object[] { side, derivative }));
}
