private int[] DecodeGridPattern()
{
var(row, column) = PyxcellConvert.GetGridPosition(_gridNumber);
var pixelRow = _image.GetPixelRowSpan(row);
var pattern = new int[Constraints.GridSize];
for (int i = 0; i < pattern.Length; i++)
{
Color columnFill = new Rgba32(pixelRow[column + i].Rgba);
pattern[i] = columnFill == Color.Transparent ? 0 : 1;
}
return(pattern);
}
public void Draw(int[] pattern, Color colour)
{
var(row, column) = PyxcellConvert.GetGridPosition(_gridNumber);
for (int i = 0; i < pattern.Length; i++)
{
if (pattern[i] == 1)
{
var topLeft = new PointF(column + i, row);
var bottomRight = new PointF(topLeft.X + 1, topLeft.Y + Constraints.GridSize);
var line = new RectangularPolygon(topLeft, bottomRight);
_image.Mutate(x => x.Fill(colour, line));
}
}
_gridNumber++;
}
private Color DecodeGridColour()
{
var(row, column) = PyxcellConvert.GetGridPosition(_gridNumber);
var pixelRow = _image.GetPixelRowSpan(row);
Color colour = Color.Transparent;
for (int i = 0; i < Constraints.GridSize; i++)
{
colour = new Rgba32(pixelRow[column + i].Rgba);
if (colour != Color.Transparent)
{
break;
}
}
if (colour == Color.Transparent)
{
throw new Exception($"Could not find colour for grid {_gridNumber}.");
}
return(colour);
}