public void SetGlyphDrawer(GlyphDrawer glyphDrawer, double fontSize)
{
if (this.glyphDrawer == glyphDrawer && this.fontSize == fontSize)
{
return;
}
this.glyphDrawer = glyphDrawer;
this.fontSize = fontSize;
if (timeSpanUnitConfigs == null)
{
timeSpanUnitConfigs = new TimeSpanUnitConfig[(int)TimeSpanUnitEnum.max + 1];
}
maxFollowLabelWidth = double.MinValue;
for (TimeSpanUnitEnum timeSpanUnitIndex = TimeSpanUnitEnum.none + 1; timeSpanUnitIndex <= TimeSpanUnitEnum.max; timeSpanUnitIndex++)
{
TimeSpanUnitMask mask = timeSpanUnitIndex.GetMask();
double firstLabelWidth = glyphDrawer.GetLength(mask.FirstLabelMask !, fontSize);
double followLabelWidth = glyphDrawer.GetLength(mask.FollowLabelMask !, fontSize);
maxFollowLabelWidth = Math.Max(followLabelWidth, maxFollowLabelWidth);
timeSpanUnitConfigs[(int)timeSpanUnitIndex] = new TimeSpanUnitConfig(timeSpanUnitIndex, firstLabelWidth, followLabelWidth);
}
}
protected override void OnRecalculate(ref double[]?labelValues, ref string?[]?labelStrings, ref Point[]?labelPoints)
{
//choose time unit (seconds to years)
TimeSpanUnitEnum newTimeSpanUnit = timeSpanUnitFormatter.GetDefaultTimeSpanUnit(DisplayDateRange, RenderWidthTracked);
//check if even more labels can be displayed
TimeSpan step = TimeSpan.MinValue;
DateTime firstLabelDate = DateTime.MinValue;
int labelsCount = int.MinValue;
double spaceBetweenLabels = LegendGlyphDrawer.GetLength(" ", FontSize);
while (true)
{
calculate(newTimeSpanUnit, out var newStep, out var newFirstLabelDate, out var newLabelsCount);
TimeSpanUnitConfig timeSpanUnitConfig = timeSpanUnitFormatter.GetWidths(newTimeSpanUnit);
double totalWidth = timeSpanUnitConfig.FirstLabelWidth;
if (newLabelsCount > 1)
{
totalWidth += (newLabelsCount - 1) * (timeSpanUnitConfig.FollowLabelWidth + spaceBetweenLabels) * 1.1;
}
if (totalWidth > RenderWidthTracked || newTimeSpanUnit < 0)
{
if (labelsCount == int.MinValue)
{
//seems even the first estimated step is already too big. Just use the values
step = newStep;
firstLabelDate = newFirstLabelDate;
labelsCount = newLabelsCount;
}
else
{
//take previous TimeSpanUnit
newTimeSpanUnit += 1;
}
break;
}
step = newStep;
firstLabelDate = newFirstLabelDate;
labelsCount = newLabelsCount;
newTimeSpanUnit -= 1;
}
TimeSpanUnit = newTimeSpanUnit;
if (labelValues == null || labelValues.Length != labelsCount)
{
labelValues = new double[labelsCount];
labelStrings = new string[labelsCount];
labelPoints = new Point[labelsCount];
}
//calculate labels
double pixelPerValue = RenderWidthTracked / DisplayValueRange;
TimeSpanUnitMask mask = newTimeSpanUnit.GetMask();
double firstLabelWidth = double.MinValue;
DateTime labelDate = firstLabelDate;
for (int labelIndex = 0; labelIndex < labelsCount; labelIndex++)
{
//write label value
labelValues[labelIndex] = labelDate.ToDouble();
//calculate position
double xPosition = (labelValues[labelIndex] - DisplayValue) * pixelPerValue;
#if DEBUG
if (xPosition > RenderWidthTracked && labelsCount > 1)
{
if (xPosition - RenderWidthTracked > 0.0001)//filter rounding problems
//should not happen
{
System.Diagnostics.Debugger.Break();
throw new Exception();
}
}
#endif
labelPoints ![labelIndex] = new Point(xPosition, 0);