private double GetLabelOffset(PieChart pieChart)
{
double labelOffset = 0;
object rawLabelOffset = ReadLocalValue(LabelOffsetProperty);
if (rawLabelOffset == DependencyProperty.UnsetValue)
labelOffset = pieChart.LabelOffset;
else
labelOffset = (double)rawLabelOffset;
return labelOffset;
}
internal void Update(double offset, double percentage, PieChart pieChart)
{
double thickness = Thickness;
if (thickness == 0)
thickness = pieChart.Thickness;
double minHalfSize = Math.Min(ActualWidth, ActualHeight) / 2;
thickness = Math.Min(minHalfSize, thickness);
double radius = minHalfSize - thickness / 2;
if (radius > 0)
{
if (offset < 0)
offset = 0;
else if (offset >= 100)
offset = 99.9999d;
if (percentage < 0)
percentage = 0;
if (percentage >= 100)
percentage = 99.9999d;
double angleOffset = (offset * 360) / 100;
double angle = (percentage * 360) / 100;
RenderArc(radius, thickness, angleOffset, angle);
double labelOffset = GetLabelOffset(pieChart);
RenderLabel(radius, labelOffset, thickness, angleOffset, angle);
}
}
