// ***************************************************************************
// PRIVATE METHODS
// ***************************************************************************
private void assembleBorders()
{
borders = new List <Border>();
// trigger to help build continuous borders
bool valid = false;
// create inline method to simplify the different scan direction below
void scan(IEnumerable <int> xLocations, IEnumerable <int> yLocations, DIRECTION direction)
{
var border = new Border(this, direction);
foreach (var x in xLocations)
{
foreach (var y in yLocations)
{
if (g[x, y] < 1)
{
border.AddLocation(new Location(x, y) + corner);
valid = true;
}
else
{
// sharp break in discomfort, unpassable location, close off this border
if (valid)
{
borders.Add(border);
border = new Border(this, direction);
}
valid = false;
}
}
}
// after the edge was scanned, see if we add this final border up to the corner
if (valid)
{
Borders.Add(border);
}
}
// scan the bottom (y=0, SOUTH)
scan(Enumerable.Range(0, g.GetLength(0)), Enumerable.Range(0, 1), DIRECTION.SOUTH);
// scan the top (y=length, NORTH)
scan(Enumerable.Range(0, g.GetLength(0)), Enumerable.Range(g.GetLength(1) - 1, 1), DIRECTION.NORTH);
// scan the left (x=0, WEST)
scan(Enumerable.Range(0, 1), Enumerable.Range(0, g.GetLength(1)), DIRECTION.WEST);
// scan the right (x=length, EAST)
scan(Enumerable.Range(g.GetLength(0) - 1, 1), Enumerable.Range(0, g.GetLength(1)), DIRECTION.EAST);
}
