/// <summary>
/// Calculate the values needed to properly display this <see cref="PieItem"/>.
/// </summary>
/// <param name="pane">
/// A graphic device object to be drawn into. This is normally e.Graphics from the
/// PaintEventArgs argument to the Paint() method.
/// </param>
/// <param name="maxDisplacement">maximum slice displacement</param>
private static void CalculatePieChartParams(GraphPane pane, ref double maxDisplacement)
{
string lblStr = " ";
//loop thru slices and get total value and maxDisplacement
double pieTotalValue = 0;
foreach (PieItem curve in pane.CurveList)
{
if (curve.IsPie)
{
pieTotalValue += curve._pieValue;
if (curve.Displacement > maxDisplacement)
{
maxDisplacement = curve.Displacement;
}
}
}
double nextStartAngle = 0;
//now loop thru and calculate the various angle values
foreach (PieItem curve in pane.CurveList)
{
lblStr = curve._labelStr;
curve.StartAngle = (float)nextStartAngle;
curve.SweepAngle = (float)(360 * curve.Value / pieTotalValue);
curve.MidAngle = curve.StartAngle + curve.SweepAngle / 2;
nextStartAngle = curve._startAngle + curve._sweepAngle;
PieItem.BuildLabelString(curve);
}
}
