/// <summary>
/// Calculates a location based on the shape dimensions as well as the proposed location.
/// </summary>
/// <param name="placement">Link placement.</param>
/// <param name="shapeDimensions">Dimensions of the shape, this link start/end is created at.</param>
/// <param name="proposedLocation">Proposed location of the link start/end.</param>
/// <returns>Calculated location.</returns>
public static PointD CalculateLocation(LinkPlacement placement, RectangleD shapeDimensions, PointD proposedLocation)
{
double x = proposedLocation.X;
double y = proposedLocation.Y;
double itemWidth = 7;
double itemHeight = 7;
switch (placement)
{
case LinkPlacement.Left:
x = shapeDimensions.Left - itemWidth;
if (y <= (shapeDimensions.Top - itemHeight))
y = shapeDimensions.Top - itemHeight;
else if (y > shapeDimensions.Bottom)
y = shapeDimensions.Bottom;
break;
case LinkPlacement.Top:
y = shapeDimensions.Top - itemHeight;
if (x <= (shapeDimensions.Left - itemWidth))
x = shapeDimensions.Left - itemWidth;
else if (x > shapeDimensions.Right)
x = shapeDimensions.Right;
break;
case LinkPlacement.Right:
x = shapeDimensions.Right + 3.4 * 2;
if (y <= (shapeDimensions.Top - itemHeight))
y = shapeDimensions.Top - itemHeight;
else if (y > shapeDimensions.Bottom)
y = shapeDimensions.Bottom;
break;
case LinkPlacement.Bottom:
y = shapeDimensions.Bottom + 3.4 * 2;
if (x <= (shapeDimensions.Left - itemWidth))
x = shapeDimensions.Left - itemWidth;
else if (x > shapeDimensions.Right)
x = shapeDimensions.Right;
break;
}
return new PointD(x, y);
}
/// <summary>
/// Update link placement end.
/// </summary>
public void UpdateLinkPlacementTarget()
{
if (this.TargetAnchor != null)
{
if (this.TargetAnchor.ToShape != null)
LinkPlacementEnd = GetLinkPlacement(this.TargetAnchor.ToShape.AbsoluteBounds, this.EndPoint);
if (this.TargetAnchor.AbsoluteLocation != this.EndPoint)
{
if (!this.Store.InSerializationTransaction)
this.TargetAnchor.DiscardLocationChange = true;
this.TargetAnchor.AbsoluteLocation = this.EndPoint;
}
}
}
