/// <summary>
/// Overrides dispose to correctly handle disposing the objects at the raster level.
/// </summary>
/// <param name="disposeManagedResources"></param>
protected override void Dispose(bool disposeManagedResources)
{
if (disposeManagedResources)
{
if (Bands != null)
{
foreach (IRaster r in Bands)
{
r.Dispose();
}
Bands = null;
Bounds = null;
CustomFileType = null;
DriverCode = null;
Filename = null;
Notes = null;
Options = null;
_rows = null;
_tag = null;
_values = null;
}
}
if (Bands != null)
{
foreach (IRaster r in Bands)
{
if (!r.IsDisposeLocked)
{
r.Dispose();
}
}
Bands = null;
}
base.Dispose(disposeManagedResources);
}
static private void Hoi(IValueGrid src, double nodata, double xllcenter, double yllcenter, double cellsize, int nrow, int ncol, IValueGrid output)
{
double todeg = 180.0 / Math.PI;
for (int i = 1; i < nrow - 1; i++)
{
bool flg = false;
double dx3 = 0;
double dy3 = 0;
for (int j = 1; j < ncol - 1; j++)
{
if (Check8(src, nodata, j, i) == false)
{
continue;
}
if (flg == false)
{
Dxdy(j, i, xllcenter, yllcenter, cellsize, out dx3, out dy3);
dx3 = dx3 * 3;
dy3 = dy3 * 3;
flg = true;
}
double Hx = (src[i - 1, j - 1] + src[i, j - 1] + src[i + 1, j - 1] - (src[i - 1, j + 1] + src[i, j + 1] + src[i + 1, j + 1])) / (dx3);
double Hy = (src[i + 1, j - 1] + src[i + 1, j] + src[i + 1, j + 1] - (src[i - 1, j - 1] + src[i - 1, j] + src[i - 1, j + 1])) / (dy3);
double sita = Math.Atan(Hx / Hy) * todeg;
if (Hy < 0)
{
sita = sita + 180;
}
output[i - 1, j - 1] = sita;
if ((Hy == 0) && (Hx == 0))
{
output[i - 1, j - 1] = nodata;
}
}
}
}
static private bool Check8(IValueGrid grd, double nodata, int x, int y)
{
if (grd[y - 1, x - 1] == nodata)
{
return(false);
}
if (grd[y, x - 1] == nodata)
{
return(false);
}
if (grd[y + 1, x - 1] == nodata)
{
return(false);
}
if (grd[y, x - 1] == nodata)
{
return(false);
}
if (grd[y, x + 1] == nodata)
{
return(false);
}
if (grd[y - 1, x + 1] == nodata)
{
return(false);
}
if (grd[y, x - 1] == nodata)
{
return(false);
}
if (grd[y + 1, x + 1] == nodata)
{
return(false);
}
return(true);
}
