public override bool CalculateCalloutLocation(out PointF location, out CoordinateSystem coordinateSystem)
{
// if the user has manually positioned the callout, we won't override it
if (_manuallyPositionedCallout)
{
location = PointF.Empty;
coordinateSystem = CoordinateSystem.Destination;
return(false);
}
Callout.CoordinateSystem = CoordinateSystem.Destination;
AnnotationSubject.CoordinateSystem = CoordinateSystem.Destination;
try
{
var roiBoundingBox = AnnotationSubject.BoundingBox;
var clientRectangle = AnnotationSubject.ParentPresentationImage.ClientRectangle;
var textSize = Callout.TextBoundingBox.Size;
if (textSize.IsEmpty)
{
textSize = new SizeF(100, 50);
}
coordinateSystem = CoordinateSystem.Destination;
location = new PointF(ComputeCalloutLocationX(textSize, clientRectangle, roiBoundingBox), ComputeCalloutLocationY(textSize, clientRectangle, roiBoundingBox));
}
finally
{
Callout.ResetCoordinateSystem();
AnnotationSubject.ResetCoordinateSystem();
}
return(true);
}
/// <summary>
/// Calculates the initial callout location only; returns false thereafter.
/// </summary>
public virtual bool CalculateCalloutLocation(out PointF location, out CoordinateSystem coordinateSystem)
{
location = PointF.Empty;
coordinateSystem = CoordinateSystem.Destination;
if (!_initialLocationSet)
{
_initialLocationSet = true;
SizeF offset = new SizeF(0, 55);
// Setup the callout
AnnotationSubject.CoordinateSystem = CoordinateSystem.Destination;
location = RectangleUtilities.ConvertToPositiveRectangle(AnnotationSubject.BoundingBox).Location - offset;
AnnotationSubject.ResetCoordinateSystem();
return(true);
}
return(false);
}
