// Helper function to resolve points cleaner.
// This will also work for negative indexes
private static Point GetWordCoord(Word word, Point startPoint, int index, int parallelOffset = 0)
{
startPoint.X += word.GetDirection() == Direction.Vertical ? parallelOffset : 0;
startPoint.Y += word.GetDirection() == Direction.Horizontal ? parallelOffset : 0;
int x = startPoint.X + (word.GetDirection() == Direction.Horizontal ? index : 0);
int y = startPoint.Y + (word.GetDirection() == Direction.Vertical ? index : 0);
return(new Point(x, y));
}
// Will return -1 if the word cannot be placed.
private int CountIntersections(Word word, Point start)
{
int intersections = 0;
if (!CanWordFit(word, start))
{
return(-1);
}
for (int i = 0; i < word.GetLength(); ++i)
{
Point p = GetWordCoord(word, start, i);
if (blocks[p.X, p.Y] != null)
{
if (blocks[p.X, p.Y].GetAnswer() == word.GetCorrectWord()[i])
{
intersections++;
}
else if (!blocks[p.X, p.Y].CanOverwrite(word.GetDirection()))
{
return(-1);
}
}
}
return(intersections);
}
// Excpects a word that can be placed
private void PlaceWord(Word word, Point start)
{
Point before = GetWordCoord(word, start, -1);
Point after = GetWordCoord(word, start, word.GetLength());
// Its ok to overwrite the old block here since black blocks do not get stored anywhere else than the block[,] array
blocks[before.X, before.Y] = new BlackBlock(BlockOverwrite.None);
blocks[after.X, after.Y] = new BlackBlock(BlockOverwrite.None);
for (int i = 0; i < word.GetLength(); i++)
{
Point p = GetWordCoord(word, start, i);
if (blocks[p.X, p.Y] == null || blocks[p.X, p.Y] is BlackBlock)
{
blocks[p.X, p.Y] = new CharacterBlock(word.GetCorrectWord()[i]);
}
word.SetSharedBlock(blocks[p.X, p.Y] as CharacterBlock, i);
ProhibitOverwrite(GetWordCoord(word, start, i, 1), word.GetDirection());
ProhibitOverwrite(GetWordCoord(word, start, i, -1), word.GetDirection());
}
words.Add(word);
}