/// <summary>
/// Compares two regions.
/// </summary>
/// <param name="rect1">The first region.</param>
/// <param name="rect2">The second region.</param>
public static bool IsEqual(Rect rect1, Rect rect2)
{
double DiffX = Math.Abs(rect2.X - rect1.X);
double DiffY = Math.Abs(rect2.Y - rect1.Y);
double DiffCX = Math.Abs(rect2.Width - rect1.Width);
double DiffCY = Math.Abs(rect2.Height - rect1.Height);
return(RegionHelper.IsZero(DiffX) && RegionHelper.IsZero(DiffY) && RegionHelper.IsZero(DiffCX) && RegionHelper.IsZero(DiffCY));
}
/// <summary>
/// Compares two sizes. Stretched sizes are never equal, even to themselves.
/// </summary>
/// <param name="size1">The first size.</param>
/// <param name="size2">The second size.</param>
public static bool IsEqual(Size size1, Size size2)
{
double DiffCX = size1.Width.IsFloating && size2.Width.IsFloating ? 0 : Math.Abs((size2.Width - size1.Width).Draw);
double DiffCY = size1.Height.IsFloating && size2.Height.IsFloating ? 0 : Math.Abs((size2.Height - size1.Height).Draw);
Debug.Assert(!double.IsNaN(DiffCX) && !double.IsNaN(DiffCY));
return(RegionHelper.IsZero(DiffCX) && RegionHelper.IsZero(DiffCY));
}
/// <summary>
/// Returns the union of the visible surface of two rectangles.
/// </summary>
/// <param name="rect1">The first rectangle.</param>
/// <param name="rect2">The second rectangle.</param>
public static Rect VisibleUnion(Rect rect1, Rect rect2)
{
Debug.Assert(RegionHelper.IsFixed(rect1));
Debug.Assert(RegionHelper.IsFixed(rect2));
GetUnionX(rect1, rect2, out double UnionX, out double UnionCX);
GetUnionY(rect1, rect2, out double UnionY, out double UnionCY);
return(new Rect(UnionX, UnionY, UnionCX - UnionX, UnionCY - UnionY));
}
/// <summary>
/// Returns the union of the visible surface of two rectangles.
/// </summary>
/// <param name="rect1">The first rectangle.</param>
/// <param name="rect2">The second rectangle.</param>
public static Rect VisibleUnion(Rect rect1, Rect rect2)
{
Debug.Assert(RegionHelper.IsFixed(rect1));
Debug.Assert(RegionHelper.IsFixed(rect2));
double UnionX;
double UnionY;
double UnionCX;
double UnionCY;
if (rect1.Width > 0 && rect2.Width > 0)
{
UnionX = rect1.X < rect2.X ? rect1.X : rect2.X;
UnionCX = rect1.X + rect1.Width > rect2.X + rect2.Width ? rect1.X + rect1.Width : rect2.X + rect2.Width;
}
else if (rect1.Width > 0)
{
UnionX = rect1.X;
UnionCX = rect1.X + rect1.Width;
}
else if (rect2.Width > 0)
{
UnionX = rect2.X;
UnionCX = rect2.X + rect2.Width;
}
else
{
UnionX = rect1.X < rect2.X ? rect1.X : rect2.X;
UnionCX = UnionX;
}
if (rect1.Height > 0 && rect2.Height > 0)
{
UnionY = rect1.Y < rect2.Y ? rect1.Y : rect2.Y;
UnionCY = rect1.Y + rect1.Height > rect2.Y + rect2.Height ? rect1.Y + rect1.Height : rect2.Y + rect2.Height;
}
else if (rect1.Height > 0)
{
UnionY = rect1.Y;
UnionCY = rect1.Y + rect1.Height;
}
else if (rect2.Height > 0)
{
UnionY = rect2.Y;
UnionCY = rect2.Y + rect2.Height;
}
else
{
UnionY = rect1.Y < rect2.Y ? rect1.Y : rect2.Y;
UnionCY = UnionY;
}
return(new Rect(UnionX, UnionY, UnionCX - UnionX, UnionCY - UnionY));
}
