protected override Size MeasureOverride(Size availableSize)
{
Size size = new Size(Double.PositiveInfinity, Double.PositiveInfinity);
Size resultSize = new Size();
if (this.Children == null || this.Children.Count == 0)
{
return(resultSize);
}
RecalcParams();
int iCurrentChildIndex = 0;
dXMax = Double.MinValue;
dYMax = Double.MinValue;
dXMin = Double.MaxValue;
dYMin = Double.MaxValue;
foreach (UIElement child in Children)
{
double dAngle = ((double)(iCurrentChildIndex)) * dRenderAngleSpacing + StartAngle;
double dX = dRenderRadius * Math.Sin(dAngle * dDegToRad);
// We invert the Y coordinate, because the origin in controls
// is the upper left corner, rather than the lower left
double dY = -dRenderRadius *Math.Cos(dAngle *dDegToRad);
child.Measure(size);
Point visualCenter = new Point();
if (child is ICustomAlignedControl)
{
ICustomAlignedControl mkchild = (ICustomAlignedControl)child;
visualCenter.X = mkchild.AlignReferencePoint.X;
visualCenter.Y = mkchild.AlignReferencePoint.Y;
}
else
{
visualCenter.X = child.DesiredSize.Width * 0.5;
visualCenter.Y = child.DesiredSize.Height * 0.5;
}
dXMax = Math.Max(dXMax, dX + (child.DesiredSize.Width - visualCenter.X));
dYMax = Math.Max(dYMax, dY + (child.DesiredSize.Height - visualCenter.Y));
dXMin = Math.Min(dXMin, dX - (visualCenter.X));
dYMin = Math.Min(dYMin, dY - (visualCenter.Y));
iCurrentChildIndex++;
}
resultSize.Width = dXMax - dXMin;
resultSize.Height = dYMax - dYMin;
return(resultSize);
}
private Vector GetChildOffset(UIElement child, double dAngle)
{
Vector Offset = new Vector();
if (child is ICustomAlignedControl)
{
ICustomAlignedControl mkchild = (ICustomAlignedControl)child;
Offset.X = dRenderRadius * Math.Sin(dAngle * dDegToRad) - dXMin - mkchild.AlignReferencePoint.X;
Offset.Y = -dRenderRadius *Math.Cos(dAngle *dDegToRad) - dYMin - mkchild.AlignReferencePoint.Y;
}
else
{
Offset.X = dRenderRadius * Math.Sin(dAngle * dDegToRad) - dXMin - child.DesiredSize.Width * 0.5;
Offset.Y = -dRenderRadius *Math.Cos(dAngle *dDegToRad) - dYMin - child.DesiredSize.Height * 0.5;
}
return(Offset);
}