private void setAngle(double a)
{
a = FrameworkUtilities.NormalizeAngle(a);
if (Angle == a)
{
return; // no change
}
Angle = a;
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs("SnapOrientation"));
PropertyChanged(this, new PropertyChangedEventArgs("Angle"));
PropertyChanged(this, new PropertyChangedEventArgs("AngleInDegrees"));
}
}