BlockSet <IBlock> FindBlockCore(BlockSet <IBlock> blockset)
{
var blocks = blockset.ToList();
int total = blocks.Count - 1;
float limit = blockset.GetWidth() / 2;
int start = ScanBlock(i => blocks[i], blockset.GetX() + limit);
int end = ScanBlock(i => blocks[total - i], blockset.GetX() + limit);
int ini = start;
int tot = total + 1 - end;
var core = new BlockSet <IBlock>();
// get the core
for (int i = start; i <= total - end; i++)
{
core.Add(blocks[i]);
}
return(core);
}
BlockSet <IBlock>[] SplitBlock(BlockSet <IBlock> blockset)
{
var blocks = blockset.ToList();
int total = blocks.Count - 1;
float limit = blockset.GetWidth() / 2;
int start = ScanBlock(i => blocks[i], blockset.GetX() + limit);
int end = ScanBlock(i => blocks[total - i], blockset.GetX() + limit);
// no split
if (start == 0 && end == 0)
{
// VALIDATE
//System.Diagnostics.Debugger.Break();
return(new BlockSet <IBlock>[] { blockset });
}
// split into 2 pieces
int middle = -1;
// split into 2 pieces: there is a clear division
middle = (start + end > total) ? (start) : middle;
middle = (start == 0) ? (total - end + 1) : middle;
middle = (end == 0) ? (start) : middle;
if (middle > 0)
{
var blockA = new BlockSet <IBlock>();
var blockB = new BlockSet <IBlock>();
blockA.AddRange(blocks.Take(middle));
blockB.AddRange(blocks.TakeLast(total - middle + 1));
int count2 = blockA.Count() + blockB.Count();
if (count2 != blocks.Count)
{
PdfReaderException.AlwaysThrow("count2 != blocks.Count");
}
// VALIDATE
//System.Diagnostics.Debugger.Break();
return(new BlockSet <IBlock>[] { blockA, blockB });
}
// split into 3 pieces
var topBlock = new BlockSet <IBlock>();
var coreBlock = new BlockSet <IBlock>();
var bottomBlock = new BlockSet <IBlock>();
topBlock.AddRange(blocks.Take(start));
for (int i = start; i <= total - end; i++)
{
coreBlock.Add(blocks[i]);
}
bottomBlock.AddRange(blocks.TakeLast(end));
int count3 = topBlock.Count() + coreBlock.Count() + bottomBlock.Count();
if (count3 != blocks.Count)
{
PdfReaderException.AlwaysThrow("count3 != blocks.Count");
}
// VALIDATE
//System.Diagnostics.Debugger.Break();
return(new BlockSet <IBlock>[] { topBlock, coreBlock, bottomBlock });
}