protected override Size ArrangeOverride(Size arrangeBounds)
{
TranslateTransform tt = new TranslateTransform();
RadialScale scale = Owner as RadialScale;
if (scale != null)
{
// Calculate the geometry again. The first time this was done the owner had a size of (0,0)
// and so did the indicator. Once the owner has the correct size (MeasureOverride has been called)
// we should re-calculate the shape of the indicator
SetIndicatorGeometry(scale, Value);
Point center = scale.GetIndicatorOffset();
tt.X = center.X;
tt.Y = center.Y;
RenderTransform = tt;
}
return(base.ArrangeOverride(arrangeBounds));
}
private void PositionMarker()
{
if (Owner == null)
{
return;
}
if (Owner is RadialScale)
{
RadialScale rs = (RadialScale)Owner;
// Get the angle based on the value
double angle = rs.GetAngleFromValue(Value);
if (rs.SweepDirection == SweepDirection.Counterclockwise)
{
angle = -angle;
}
// Rotate the marker by angle
TransformGroup tg = RenderTransform as TransformGroup;
if (tg != null)
{
RotateTransform rt = tg.Children[0] as RotateTransform;
if (rt != null)
{
rt.Angle = angle;
}
}
// Position the marker based on the radius
Point offset = rs.GetIndicatorOffset();
double rad = rs.GetIndicatorRadius();
//position the marker
double px = offset.X + (rad - DesiredSize.Height / 2) * Math.Sin(angle * Math.PI / 180);
double py = offset.Y - (rad - DesiredSize.Height / 2) * Math.Cos(angle * Math.PI / 180);
// Cache the intended position of the Indicator before it's centered
this.Center = new Point(px, py);
// Subtract the width of the Indicator's size so that it looks centered
px -= DesiredSize.Width / 2;
py -= DesiredSize.Height / 2;
if (tg != null)
{
TranslateTransform tt = tg.Children[1] as TranslateTransform;
if (tt != null)
{
tt.X = px;
tt.Y = py;
}
}
}
//else
//{
// LinearScale ls = Owner as LinearScale;
// Point offset = ls.GetIndicatorOffset(this);
// //the getIndicatorOffset returns only one correct dimension
// //for marker indicators the other dimension will have to be calculated again
// if (ls.Orientation == Orientation.Horizontal)
// {
// offset.X = ls.ActualWidth * (Value - ls.Minimum) / (ls.Maximum - ls.Minimum) - DesiredSize.Width / 2;
// }
// else
// {
// offset.Y = ls.ActualHeight - ls.ActualHeight * (Value - ls.Minimum) / (ls.Maximum - ls.Minimum) - DesiredSize.Height / 2;
// }
// TransformGroup tg = RenderTransform as TransformGroup;
// if (tg != null)
// {
// TranslateTransform tt = tg.Children[1] as TranslateTransform;
// if (tt != null)
// {
// tt.X = offset.X;
// tt.Y = offset.Y;
// }
// }
//}
}