private void ClearUnVisibility()
{
int vOffset = (int)_scrollViewer.VerticalOffset;
int hOffset = (int)_scrollViewer.HorizontalOffset;
int aH = (int)_scrollViewer.ActualHeight;
int aW = (int)_scrollViewer.ActualWidth;
var rowFirst = vOffset / 256;
var colFirst = hOffset / 256;
var rowLast = (aH + vOffset) / 256;
var colLast = (aW + hOffset) / 256;
int rowCol = (int)(_grid.Height / 256);
if (rowLast < rowCol)
{
rowLast = rowLast + 1;
}
else
{
rowLast = rowCol;
}
if (colLast < rowCol)
{
colLast = colLast + 1;
}
else
{
colLast = rowCol;
}
_grid.Children.Clear();
for (int i = rowFirst; i < rowLast; i++)
{
for (int j = colFirst; j < colLast; j++)
{
Image tb = new Image();
var path = "MapWorld.MapWorld.Size" + _levelOfDetail + ".os_" + j + "_" + i + "_" + _levelOfDetail + ".png";
tb.Source = _baseA.GetPartMap(path);
// tb.Visibility = Visibility.Hidden;
Grid.SetRow(tb, i);
Grid.SetColumn(tb, j);
_grid.Children.Add(tb);
}
}
}
