public static PointF?GetPieTooltipLocation(
this IEnumerable <TooltipPoint> foundPoints, TooltipPosition position, SizeF tooltipSize)
{
var placementContext = new TooltipPlacementContext();
var found = false;
foreach (var foundPoint in foundPoints)
{
if (foundPoint.Point.PointContext.HoverArea == null)
{
continue;
}
foundPoint.Point.PointContext.HoverArea.SuggestTooltipPlacement(placementContext);
found = true;
break; // we only care about the first one.
}
return(found ? new PointF(placementContext.PieX, placementContext.PieY) : null);
}
/// <summary>
/// Returns the left, top coordinate of the tooltip based on the found points, the position and the tooltip size.
/// </summary>
/// <param name="foundPoints"></param>
/// <param name="position"></param>
/// <param name="tooltipSize"></param>
/// <returns></returns>
public static PointF?GetCartesianTooltipLocation(
this IEnumerable <TooltipPoint> foundPoints, TooltipPosition position, SizeF tooltipSize)
{
float count = 0f;
var placementContext = new TooltipPlacementContext();
foreach (var point in foundPoints)
{
if (point.Point.PointContext.HoverArea == null)
{
continue;
}
point.Point.PointContext.HoverArea.SuggestTooltipPlacement(placementContext);
count++;
}
if (count == 0)
{
return(null);
}
var avrgX = ((placementContext.MostRight + placementContext.MostLeft) / 2f) - tooltipSize.Width * 0.5f;
var avrgY = ((placementContext.MostTop + placementContext.MostBottom) / 2f) - tooltipSize.Height * 0.5f;
switch (position)
{
case TooltipPosition.Top: return(new PointF(avrgX, placementContext.MostTop - tooltipSize.Height));
case TooltipPosition.Bottom: return(new PointF(avrgX, placementContext.MostBottom));
case TooltipPosition.Left: return(new PointF(placementContext.MostLeft - tooltipSize.Width, avrgY));
case TooltipPosition.Right: return(new PointF(placementContext.MostRight, avrgY));
case TooltipPosition.Center: return(new PointF(avrgX, avrgY));
default: throw new NotImplementedException();
}
}
public abstract void SuggestTooltipPlacement(TooltipPlacementContext context);
