/// <summary>
/// Gets the smallest of two distances.
/// </summary>
/// <param name="first">First distance.</param>
/// <param name="second">Second distance.</param>
/// <returns>Smallest distance.</returns>
public static Distance Min(Distance first, Distance second)
{
Distance distance = new Distance
{
X = MathExtensions.AbsMin(first.X, second.X),
Y = MathExtensions.AbsMin(first.Y, second.Y)
};
return(distance);
}
/// <summary>
/// Returns mininal distance between two rectangles.
/// </summary>
/// <param name="first">First rectangle.</param>
/// <param name="second">Second rectangle.</param>
/// <returns>Minimal distance.</returns>
private Distance DistanceBetweenRectangles(Rect first, Rect second)
{
double x1 = DistanceBetweenRightEdgeAndRectangle(first, second);
double x2 = DistanceBetweenLeftEdgeAndRectangle(first, second);
double y1 = DistanceBetweenBottomEdgeAndRectangle(first, second);
double y2 = DistanceBetweenTopEdgeAndRectangle(first, second);
Distance distance = new Distance()
{
X = MathExtensions.AbsMin(x1, x2),
Y = MathExtensions.AbsMin(y1, y2)
};
return(distance);
}
/// <summary>
/// Returns distance between the top edge of the rectangle and another rectangle.
/// </summary>
/// <param name="first">First rectangle.</param>
/// <param name="second">Second rectangle.</param>
/// <returns>Minimal distance.</returns>
private double DistanceBetweenTopEdgeAndRectangle(Rect first, Rect second)
{
double snap;
double distance = double.NaN;
if (first.OverlapsHorizontally(second, Accuracy))
{
snap = second.Y;
if (first.Y.IsNear(snap, SnapinDistance))
{
distance = MathExtensions.AbsMin(snap - first.Y, distance);
}
snap = second.Y + second.Height + SnapinMargin;
if (first.Y.IsNear(snap, SnapinDistance))
{
distance = MathExtensions.AbsMin(snap - first.Y, distance);
}
}
return(distance);
}
/// <summary>
/// Returns distance between the left edge of the rectangle and another rectangle.
/// </summary>
/// <param name="first">First rectangle.</param>
/// <param name="second">Second rectangle.</param>
/// <returns>Minimal distance.</returns>
private double DistanceBetweenLeftEdgeAndRectangle(Rect first, Rect second)
{
double snap;
double distance = double.NaN;
if (first.OverlapsVertically(second, Accuracy))
{
snap = second.X;
if (first.X.IsNear(snap, SnapinDistance))
{
distance = MathExtensions.AbsMin(snap - first.X, distance);
}
snap = second.X + second.Width + SnapinMargin;
if (first.X.IsNear(snap, SnapinDistance))
{
distance = MathExtensions.AbsMin(snap - first.X, distance);
}
}
return(distance);
}