/// <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));
}