public void ExtentCloneTest()
{
Extent e = new Extent(3, 6, 8, 9);
Assert.AreEqual(e, e.Clone(), "e is not equal to e.Clone()");
Assert.AreNotSame(e, e.Clone(), "e is the same as e.Clone()");
}
/// <summary>Modifies the extent such that its left edge is normalised into the range [-180..180] degrees.
/// Its width remains constant unless it was originally greater than 360 degrees,
/// in which case it is scaled to 360 degrees width and retains its aspect ratio.</summary>
/// <param name="extent">Extent that gets normalised.</param>
/// <returns>The normalised extent.</returns>
public static Extent Normalised(this Extent extent)
{
var newExtent = (Extent)extent.Clone();
if (newExtent.Width > 360.0)
{
const double NewWidth = 360.0;
double newHeight = newExtent.Height * NewWidth / newExtent.Width;
double xOffset = (newExtent.Width - NewWidth) / 2.0;
double yOffset = (newExtent.Height - newHeight) / 2.0;
newExtent.Width = NewWidth;
newExtent.Height = newHeight;
newExtent.X += xOffset;
newExtent.Y -= yOffset; // pinned to top left.
}
while (newExtent.X < -180)
{
double x = newExtent.X + 360.0;
if (x == newExtent.X)
{
throw new ArgumentException(MessageStrings.ExtentXIsTooLargeForDegreesToBeSignificant);
}
newExtent.X = x;
}
while (newExtent.X > 180)
{
double x = newExtent.X - 360.0;
if (x == newExtent.X)
{
throw new ArgumentException(MessageStrings.ExtentXIsTooLargeForDegreesToBeSignificant);
}
newExtent.X = x;
}
return(newExtent);
}
// Modifies the extent such that its left edge is normalised into the range [-180..180] degrees.
// It width remains constant unless it was originally greater than 360 degrees,
// in which case it is scaled to 360 degrees with and retains its aspect ratio.
public static Extent Normalised(this Extent extent)
{
var new_extent = (Extent)extent.Clone();
if (new_extent.Width > 360.0)
{
const double new_width = 360.0;
double new_height = new_extent.Height * new_width / new_extent.Width;
double x_offset = (new_extent.Width - new_width) / 2.0;
double y_offset = (new_extent.Height - new_height) / 2.0;
new_extent.Width = new_width;
new_extent.Height = new_height;
new_extent.X += x_offset;
new_extent.Y -= y_offset; // pinned to top left.
}
while (new_extent.X < -180)
{
double x = new_extent.X + 360.0;
if (x == new_extent.X)
{
throw new ArgumentException("Extent.X is too large for degrees to be significant");
}
new_extent.X = x;
}
while (new_extent.X > 180)
{
double x = new_extent.X - 360.0;
if (x == new_extent.X)
{
throw new ArgumentException("Extent.X is too large for degrees to be significant");
}
new_extent.X = x;
}
return(new_extent);
}