/// <summary>
/// Find the best <see cref="PortSide"/> according to the position of the port.
/// </summary>
/// <remarks>
/// The orientation is not rotated, i.e. <paramref name="bottomLeft"/> is always the anchor
/// of the oriented rectangle.
/// </remarks>
/// <param name="point">The port position.</param>
/// <param name="bottomLeft">The bottom left corner of the oriented rectangle.</param>
/// <param name="bottomRight">The bottom right corner.</param>
/// <param name="topLeft">The top left corner.</param>
/// <param name="topRight">The top right corner.</param>
/// <returns>The side to which the given port is closest.</returns>
private static PortSide FindBestSide(PointD point, PointD bottomLeft, PointD bottomRight, PointD topLeft, PointD topRight)
{
// determine the distances to the sides of the oriented rectangle
// with a small penalty to the left and right side.
var distToBottom = point.DistanceToSegment(bottomLeft, bottomRight);
var distToTop = point.DistanceToSegment(topLeft, topRight);
var distToLeft = point.DistanceToSegment(topLeft, bottomLeft) * 1.05;
var distToRight = point.DistanceToSegment(topRight, bottomRight) * 1.05;
PortSide side;
if (distToTop <= distToBottom)
{
if (distToTop <= distToLeft)
{
side = distToTop <= distToRight ? PortSide.North : PortSide.East;
}
else
{
side = distToLeft < distToRight ? PortSide.West : PortSide.East;
}
}
else if (distToBottom <= distToLeft)
{
side = distToBottom <= distToRight ? PortSide.South : PortSide.East;
}
else
{
side = distToLeft < distToRight ? PortSide.West : PortSide.East;
}
return(side);
}
/// <summary>
/// Determines the index of the segment in which the bend was created.
/// </summary>
private int DetermineBendSegmentIndex(List <PointD> points, PointD location)
{
int closestIndex = -1;
double minDist = Double.MaxValue;
for (int i = 0; i < points.Count - 1; i++)
{
double dist = location.DistanceToSegment(points[i], points[i + 1]);
if (dist < minDist)
{
closestIndex = i;
minDist = dist;
}
}
return(closestIndex);
}