static public IGrid <T> BoundSubSection <T>(this IGrid <T> item, int x1, int y1, int x2, int y2)
{
if (item != null)
{
x1 = x1.BindBetween(0, item.GetWidth());
x2 = x2.BindBetween(0, item.GetHeight());
y1 = y1.BindBetween(0, item.GetHeight());
y2 = y2.BindBetween(0, item.GetHeight());
if (x1 == 0 && y1 == 0 && x2 == item.GetWidth() && y2 == item.GetHeight())
{
return(item);
}
return(new IGridTransform <T>(
x2 - x1,
y2 - y1,
(x, y) => item[x1 + x, y1 + y],
(x, y, v) => item[x1 + x, y1 + y] = v
));
}
return(Empty.IGrid <T>());
}
static public IGrid <OUTPUT_TYPE> Convert <INPUT_TYPE, OUTPUT_TYPE>(this IGrid <INPUT_TYPE> item, Operation <OUTPUT_TYPE, INPUT_TYPE> operation)
{
if (item != null)
{
return(new IGridTransform <OUTPUT_TYPE>(item.GetWidth(), item.GetHeight(),
(x, y) => operation(item[x, y])
));
}
return(Empty.IGrid <OUTPUT_TYPE>());
}
static public IGrid <T> ConvertMaskedInclusion <T>(this IGrid <T> item, HashSet <VectorI2> included)
{
if (item != null)
{
return(new IGridTransform <T>(item.GetWidth(), item.GetHeight(),
(x, y) => included.Contains(new VectorI2(x, y)).ConvertBool(() => item[x, y]),
(x, y, v) => included.Contains(new VectorI2(x, y)).IfTrue(() => item[x, y] = v)
));
}
return(Empty.IGrid <T>());
}
static public IGrid <T> UnboundSubSection <T>(this IGrid <T> item, int x1, int y1, int x2, int y2, T default_value = default(T))
{
if (item != null)
{
return(new IGridTransform <T>(
x2 - x1,
y2 - y1,
(x, y) => item.Get(x, y, default_value),
(x, y, v) => item.SetDropped(x, y, v)
));
}
return(Empty.IGrid <T>());
}
