private void RefreshCell(int posX, int posY)
{
int drawX = posX * _cellSize;
int drawY = posY * _cellSize;
Point position = new Point(posX, posY);
using (Graphics graphics = Graphics.FromImage(_backGroundImage))
{
switch (_puzzleBoard.GetState(new Point(posX, posY)))
{
case PuzzleCellStateTypes.NotMarked:
graphics.FillRectangle(Brushes.White, drawX, drawY, _cellSize, _cellSize);
break;
case PuzzleCellStateTypes.Filled:
graphics.FillRectangle(Brushes.Black, drawX, drawY, _cellSize, _cellSize);
break;
case PuzzleCellStateTypes.Empty:
graphics.FillRectangle(Brushes.Gainsboro, drawX, drawY, _cellSize, _cellSize);
graphics.DrawLine(new Pen(Color.Gray), drawX, drawY, drawX + _cellSize, drawY + _cellSize);
graphics.DrawLine(new Pen(Color.Gray), drawX, drawY + _cellSize, drawX + _cellSize, drawY);
break;
case PuzzleCellStateTypes.Outside:
graphics.FillRectangle(Brushes.DarkBlue, drawX, drawY, _cellSize, _cellSize);
graphics.DrawLine(new Pen(Color.White), drawX, drawY, drawX + _cellSize, drawY + _cellSize);
graphics.DrawLine(new Pen(Color.White), drawX, drawY + _cellSize, drawX + _cellSize, drawY);
break;
}
if (_cbxHighlightErrors.Checked && _puzzleBoard.IsWrong(position))
{
Pen errorPositionPen = new Pen(Brushes.Red, 3);
graphics.DrawRectangle(errorPositionPen, drawX + 2, drawY + 2, _cellSize - 4, _cellSize - 4);
}
}
}