private void pictureBox1_Paint(object sender, PaintEventArgs e)
{
var g = e.Graphics;
g.Clear(Color.White);
// Find scale
float scale = Math.Min(pictureBox1.Width, pictureBox1.Height);
g.ScaleTransform(scale, scale);
// Draw grid
Queue <Tuple <PointF, PointF> > gridLines = new Queue <Tuple <PointF, PointF> >();
// Split = 1/9 then 2/9 ...
for (int i = 0; i < 8; i++)
{
float split = (i + 1.0f) / 9.0f;
// Add vertical then horizontal line
gridLines.Enqueue(new Tuple <PointF, PointF>(
new PointF(split, 0.0f),
new PointF(split, 1.0f)
));
gridLines.Enqueue(new Tuple <PointF, PointF>(
new PointF(0.0f, split),
new PointF(1.0f, split)
));
}
// Draw each 3rd grid pair thicker
for (int i = 0; i < 8; i++)
{
var pen = (i + 1) % 3 != 0 ? new Pen(Brushes.Black, 0.01f) : new Pen(Brushes.Black, 0.02f);
var points = gridLines.Dequeue();
g.DrawLine(pen, points.Item1, points.Item2);
points = gridLines.Dequeue();
g.DrawLine(pen, points.Item1, points.Item2);
}
// Draw each digit
Font f = new Font(SystemFonts.DefaultFont.FontFamily, 1.0f / 9, FontStyle.Regular, GraphicsUnit.Pixel);
Font f_bold = new Font(f, FontStyle.Bold);
StringFormat sf = new StringFormat()
{
Alignment = StringAlignment.Center, LineAlignment = StringAlignment.Center
};
for (byte row = 0; row < 9; row++)
{
for (byte col = 0; col < 9; col++)
{
byte index = (byte)(row * 9 + col);
byte digit = Sudoku[index];
if (digit == NDEF_VALUE)
{
continue;
}
Brush brush = Heatmap.TryGetValue(index, out double heat) ? new SolidBrush(Color.FromArgb((int)(heat * 255), 125, 125)) : Brushes.Black;
Font font = Heatmap.ContainsKey(index) ? f : f_bold;
RectangleF layoutRectangle = new RectangleF(col * 1.0f / 9.0f, row * 1.0f / 9.0f, 1.0f / 9.0f, 1.0f / 9.0f);
g.DrawString(digit.ToString(), font, brush, layoutRectangle, sf);
}
}
}
