void SudokuBoard_Paint(object sender, PaintEventArgs e)
{
Font f = base.Font, fMini = new Font(f.FontFamily, f.Size / 1.75f);
float rWidth = Width - spaceBeforeGrid, rHeight = Height - spaceBeforeGrid;
e.Graphics.DrawRectangle(Pens.Black, spaceBeforeGrid, spaceBeforeGrid, rWidth - 1, rHeight - 1);
float w = rWidth / 3f, h = rHeight / 3f;
bool b = true;
for (int x = 0; x < 3; x++)
{
for (int y = 0; y < 3; y++)
{
var rect = new Rectangle((int)(w * x + spaceBeforeGrid + 1), (int)(h * y + spaceBeforeGrid + 1), (int)(w - 2), (int)(h - 2));
e.Graphics.FillRectangle((b = !b) ? Brushes.AliceBlue : Brushes.GhostWhite, rect);
e.Graphics.DrawRectangle(Pens.Black, rect);
}
}
w = rWidth / 9f;
h = rHeight / 9f;
for (int x = 0; x < 9; x++)
{
float xoff = w * x;
e.Graphics.DrawString(SPoint.ColumnLetter(x), fMini, Brushes.Black, xoff + w / 1.3f, 0);
e.Graphics.DrawString(SPoint.RowLetter(x), fMini, Brushes.Black, 0, h * x + h / 1.4f);
for (int y = 0; y < 9; y++)
{
float yoff = h * y;
e.Graphics.DrawRectangle(Pens.Black, xoff + spaceBeforeGrid, yoff + spaceBeforeGrid, w, h);
if (puzzle == null)
{
continue;
}
int val = puzzle[x, y].Value;
IEnumerable <int> candidates = puzzle[x, y].Candidates;
if (snapshotIndex >= 0 && snapshotIndex < puzzle[x, y].Snapshots.Count)
{
CellSnapshot s = puzzle[x, y].Snapshots[snapshotIndex];
val = s.Value;
candidates = s.Candidates;
int xxoff = x % 3 == 0 ? 1 : 0, yyoff = y % 3 == 0 ? 1 : 0, // MATH
exoff = x % 3 == 2 ? 1 : 0, eyoff = y % 3 == 2 ? 1 : 0;
var rect = new RectangleF(xoff + spaceBeforeGrid + 1 + xxoff, yoff + spaceBeforeGrid + 1 + yyoff, w - 1 - xxoff - exoff, h - 1 - yyoff - eyoff);
bool changed = snapshotIndex - 1 >= 0 && !new HashSet <int>(s.Candidates).SetEquals(puzzle[x, y].Snapshots[snapshotIndex - 1].Candidates);
if (s.IsCulprit && changed)
{
e.Graphics.FillRectangle(culpritChangedHighlight, rect);
}
else if (s.IsCulprit)
{
e.Graphics.FillRectangle(culpritHighlight, rect);
}
else if (changed)
{
e.Graphics.FillRectangle(changedHighlight, rect);
}
}
var point = new PointF(xoff + f.Size / 1.5f + spaceBeforeGrid, yoff + f.Size / 2.25f + spaceBeforeGrid);
if (selectedCell != null && selectedCell.Point.X == x && selectedCell.Point.Y == y)
{
e.Graphics.DrawString("_", f, Brushes.Crimson, point);
}
if (val != 0)
{
e.Graphics.DrawString(val.ToString(), f, val == puzzle[x, y].OriginalValue ? Brushes.Black : changedText, point);
}
else if (showCandidates)
{
foreach (int c in candidates)
{
e.Graphics.DrawString(c.ToString(), fMini, candidateText, xoff + fMini.Size / 4 + (((c - 1) % 3) * (w / 3)) + spaceBeforeGrid, yoff + (((c - 1) / 3) * (h / 3)) + spaceBeforeGrid);
}
}
}
}
}