/// <summary>
/// Splits a pie slice into two on the split angle.
/// </summary>
/// <param name="splitAngle">
/// Angle at which splitting is performed.
/// </param>
/// <returns>
/// An array of two pie slices.
/// </returns>
internal PieSlice[] Split(float splitAngle)
{
// if split angle equals one of bounding angles, then nothing to split
if (Math.Abs(StartAngle - splitAngle) < float.Epsilon || Math.Abs(EndAngle - splitAngle) < float.Epsilon)
return new[] { (PieSlice)Clone() };
float actualStartAngle = GetActualAngle(StartAngle);
float newSweepAngle = (splitAngle - actualStartAngle + 360) % 360;
using (PieSlice pieSlice1 = new PieSlice(BoundingRectangle, SliceHeight, actualStartAngle,
newSweepAngle, m_surfaceColor, m_shadowStyle, m_edgeColorType))
{
pieSlice1.InitializeSides(true, false);
newSweepAngle = GetActualAngle(EndAngle) - splitAngle;
using (PieSlice pieSlice2 = new PieSlice(BoundingRectangle, SliceHeight, splitAngle, newSweepAngle,
m_surfaceColor, m_shadowStyle, m_edgeColorType))
{
pieSlice2.InitializeSides(false);
return new[] { (PieSlice)pieSlice1.Clone(), (PieSlice)pieSlice2.Clone() };
}
}
}
/// <summary>
/// Return the index of the foremost pie slice i.e. the one crossing
/// 90 degrees boundary.
/// </summary>
/// <param name="pieSlices">
/// Array of <c>PieSlice</c> objects to examine.
/// </param>
/// <returns>
/// Index of the foremost pie slice.
/// </returns>
private int GetForemostPieSlice(PieSlice[] pieSlices)
{
Debug.Assert(pieSlices != null && pieSlices.Length > 0);
for (int i = 0; i < pieSlices.Length; ++i)
{
PieSlice pieSlice = pieSlices[i];
if (((pieSlice.StartAngle <= 90) && ((pieSlice.StartAngle + pieSlice.SweepAngle) >= 90)) ||
((pieSlice.StartAngle + pieSlice.SweepAngle > 360) && ((pieSlice.StartAngle) <= 450) && (pieSlice.StartAngle + pieSlice.SweepAngle) >= 450))
{
return i;
}
}
Debug.Assert(false, "Foremost pie slice not found");
return -1;
}
/// <summary>
/// Splits a pie slice into two on the split angle.
/// </summary>
/// <param name="splitAngle">
/// Angle at which splitting is performed.
/// </param>
/// <returns>
/// An array of two pie slices.
/// </returns>
internal PieSlice[] Split(float splitAngle) {
// if split angle equals one of bounding angles, then nothing to split
if (StartAngle == splitAngle || this.EndAngle == splitAngle)
return new PieSlice[] { (PieSlice)Clone() };
float transformedSplitAngle = TransformAngle(splitAngle);
float actualStartAngle = GetActualAngle(StartAngle);
float newSweepAngle = (splitAngle - actualStartAngle + 360) % 360;
PieSlice pieSlice1 = new PieSlice(BoundingRectangle, SliceHeight, actualStartAngle, newSweepAngle, m_surfaceColor, m_shadowStyle, m_edgeColorType);
pieSlice1.InitializeSides(true, false);
newSweepAngle = GetActualAngle(EndAngle) - splitAngle;
PieSlice pieSlice2 = new PieSlice(BoundingRectangle, SliceHeight, splitAngle, newSweepAngle, m_surfaceColor, m_shadowStyle, m_edgeColorType);
pieSlice2.InitializeSides(false, true);
return new PieSlice[] { pieSlice1, pieSlice2 };
}
