public void Generate(double low, double high, SKRect dataRect)
{
if (low == high)
{
ticks.Clear();
return;
}
if (lockTickDensity && ts != null)
{
GenerateTickList(low, high, ts.spacing);
return;
}
else if (fixedSpacing != null)
{
if (fixedSpacing <= 0)
{
throw new ArgumentException("fixedSpacing must be >0");
}
GenerateTickList(low, high, (double)fixedSpacing);
return;
}
else
{
// Start by using a too-high tick density (tick labels will overlap)
if (side == Side.left || side == Side.right)
{
ts = new TickSpacing(low, high, (int)(dataRect.Height / 8));
}
else
{
ts = new TickSpacing(low, high, (int)(dataRect.Width / 24));
}
// then decrease density until tick labels no longer overlap
for (int i = 0; i < 10; i++)
{
GenerateTickList(ts.low, ts.high, ts.spacing);
if (!TicksOverlap(dataRect))
{
break;
}
else
{
ts.DecreaseDensity();
}
}
}
}
private void Recalculate(TickSpacing ts, double low, double high, Graphics gfx)
{
ticks.Clear();
int maxCharCount = 0;
for (double value = ts.firstTick; value < high; value += ts.spacing)
{
string label = Math.Round(value, 10).ToString();
ticks.Add(new Tick(value, label));
maxCharCount = Math.Max(maxCharCount, label.Length);
}
// slight performance enhancement by only measuring the longest string
string maxString = new string('8', maxCharCount);
biggestTickLabelSize = gfx.MeasureString(maxString, font);
// add extra padding to the label to make spacing more comfortable
biggestTickLabelSize.Width += 5;
biggestTickLabelSize.Height += 5;
}
public void FindBestTickDensity(double low, double high, RectangleF dataRect, Graphics gfx)
{
// Start by using a too-high tick density (tick labels will overlap)
// then decrease density until tick labels no longer overlap
int verticalTickCount = (int)(dataRect.Height / 8);
int horizontalTickCount = (int)(dataRect.Width / 8 * 3);
int startingTickCount = (side == Side.left || side == Side.right) ? verticalTickCount : horizontalTickCount;
TickSpacing ts = new TickSpacing(low, high, startingTickCount);
for (int i = 0; i < 10; i++)
{
Recalculate(ts, low, high, gfx);
if (!TicksOverlap(dataRect))
{
break;
}
else
{
ts.DecreaseDensity(low, high);
}
}
}