private void DrawGrid(Graphics g)
{
float height = g.ClipBounds.Size.Height;
float stepY = height / MaxTemp;
float width = g.ClipBounds.Size.Width;
var pen1 = new Pen(new SolidBrush(Color.FromArgb(128, 128, 128, 128)), 0.5f);
var pen2 = new Pen(new SolidBrush(Color.FromArgb(64, 128, 128, 128)), 1f);
// Draw line every 50 °C
for (int i = 50; i < MaxTemp; i += 50)
{
int level = (int)(height - i * stepY);
if (i % 100 == 0)
{
g.DrawLine(pen1, 0, level, width, level);
g.DrawString(i + "°C", fontSmall, Brushes.LightGray, new Point(2, level - fontSmall.Height));
}
else
{
g.DrawLine(pen2, 0, level, width, level);
}
}
// Draw line every 30 minutes
if (Measurements.Count > 1)
{
float duration = (float)(LastRecordTime - Measurements.First().Time).TotalMinutes;
float stepX = width / duration;
for (double i = 30; i < duration; i += 30)
{
g.DrawLine(pen1, (int)(i * stepX), 0, (int)(i * stepX), height);
g.DrawString((i / 60.0).ToString("0.#") + "h", fontSmall, Brushes.LightGray, new Point((int)(2 + i * stepX), (int)(height - fontSmall.Height)));
}
}
}