/// <summary>
/// Fill labels from data from data manager or
/// from axis scale.
/// </summary>
/// <param name="removeFirstRow">True if first row of auto generated labels must be removed.</param>
internal void FillLabels(bool removeFirstRow)
{
#if SUBAXES
// Process all sub-axis
foreach (SubAxis subAxis in ((Axis)this).SubAxes)
{
subAxis.FillLabels(true);
}
#endif // SUBAXES
// Labels are disabled for this axis
if (!LabelStyle.Enabled || !enabled)
{
return;
}
// For circular chart area fill only Y axis labels
if (ChartArea != null && ChartArea.chartAreaIsCurcular && axisType != AxisName.Y)
{
ICircularChartType type = ChartArea.GetCircularChartType();
if (type == null || !type.XAxisLabelsSupported())
{
return;
}
}
// Check if the custom labels exist
bool customLabelsFlag = false;
foreach (CustomLabel lab in CustomLabels)
{
if (lab.customLabel && (lab.RowIndex == 0 ||
ChartArea.chartAreaIsCurcular))
{
customLabelsFlag = true;
}
}
// Remove the first row of labels if custom labels not exist
if (removeFirstRow)
{
if (!customLabelsFlag)
{
for (int index = 0; index < CustomLabels.Count; index++)
{
if (CustomLabels[index].RowIndex == 0)
{
CustomLabels.RemoveAt(index);
index = -1;
}
}
}
else
{
return;
}
}
// Get data series for this axis.
List <string> dataSeries = null;
switch (axisType)
{
case AxisName.X:
dataSeries = ChartArea.GetXAxesSeries(AxisType.Primary, SubAxisName);
break;
case AxisName.Y:
dataSeries = ChartArea.GetYAxesSeries(AxisType.Primary, SubAxisName);
break;
case AxisName.X2:
dataSeries = ChartArea.GetXAxesSeries(AxisType.Secondary, SubAxisName);
break;
case AxisName.Y2:
dataSeries = ChartArea.GetYAxesSeries(AxisType.Secondary, SubAxisName);
break;
}
// There aren't data series connected with this axis.
if (dataSeries == null || dataSeries.Count == 0)
{
return;
}
//Let's convert the ArrayList of the series names into to string[]
string[] dataSeriesNames = new string[dataSeries.Count];
for (int i = 0; i < dataSeries.Count; i++)
{
dataSeriesNames[i] = dataSeries[i];
}
// Check if series X values all set to zeros
bool seriesXValuesZeros = ChartHelper.SeriesXValuesZeros(Common, dataSeriesNames);
// Check if series is indexed (All X values zeros or IsXValueIndexed flag set)
bool indexedSeries = true;
if (!seriesXValuesZeros)
{
indexedSeries = ChartHelper.IndexedSeries(Common, dataSeriesNames);
}
// Show End Labels
int endLabels = 0;
if (labelStyle.IsEndLabelVisible)
{
endLabels = 1;
}
// Get chart type of the first series
IChartType chartType = Common.ChartTypeRegistry.GetChartType(ChartArea.GetFirstSeries().ChartTypeName);
bool fromSeries = false;
if (!chartType.RequireAxes)
{
return;
}
else if (axisType == AxisName.Y || axisType == AxisName.Y2)
{
fromSeries = false;
}
else
{
fromSeries = true;
}
// X values from data points are not 0.
if (fromSeries && !ChartHelper.SeriesXValuesZeros(Common, dataSeries.ToArray()))
{
fromSeries = false;
}
// X values from data points are not 0.
if (fromSeries && (labelStyle.GetIntervalOffset() != 0 || labelStyle.GetInterval() != 0))
{
fromSeries = false;
}
// Get value type
ChartValueType valueType;
if (axisType == AxisName.X || axisType == AxisName.X2)
{
// If X value is indexed the type is always String. So we use indexed type instead
valueType = Common.DataManager.Series[dataSeries[0]].indexedXValueType;
}
else
{
valueType = Common.DataManager.Series[dataSeries[0]].YValueType;
}
if (labelStyle.GetIntervalType() != DateTimeIntervalType.Auto &&
labelStyle.GetIntervalType() != DateTimeIntervalType.Number &&
valueType != ChartValueType.Time &&
valueType != ChartValueType.Date &&
valueType != ChartValueType.DateTimeOffset)
{
valueType = ChartValueType.DateTime;
}
// ***********************************
// Pre calculate some values
// ***********************************
double viewMaximum = ViewMaximum;
double viewMinimum = ViewMinimum;
// ***********************************
// Labels are filled from data series.
// ***********************************
if (fromSeries)
{
int numOfPoints;
numOfPoints = Common.DataManager.GetNumberOfPoints(dataSeries.ToArray());
// Show end labels
if (endLabels == 1)
{
// min position
CustomLabels.Add(-0.5, 0.5, ValueConverter.FormatValue(
Common.Chart,
this,
null,
0.0,
LabelStyle.Format,
valueType,
ChartElementType.AxisLabels),
false);
}
// Labels from point position
for (int point = 0; point < numOfPoints; point++)
{
CustomLabels.Add(point + 0.5, point + 1.5,
ValueConverter.FormatValue(
Common.Chart,
this,
null,
point + 1,
LabelStyle.Format,
valueType,
ChartElementType.AxisLabels),
false);
}
// Show end labels
if (endLabels == 1)
{
// max position
CustomLabels.Add(numOfPoints + 0.5, numOfPoints + 1.5,
ValueConverter.FormatValue(
Common.Chart,
this,
null,
numOfPoints + 1,
LabelStyle.Format,
valueType,
ChartElementType.AxisLabels),
false);
}
int pointIndx;
foreach (string seriesIndx in dataSeries)
{
// End labels enabled
if (endLabels == 1)
{
pointIndx = 1;
}
else
{
pointIndx = 0;
}
// Set labels from data points labels
foreach (DataPoint dataPoint in Common.DataManager.Series[seriesIndx].Points)
{
// Find first row of labels
while (CustomLabels[pointIndx].RowIndex > 0)
{
pointIndx++;
}
// Add X labels
if ((axisType == AxisName.X || axisType == AxisName.X2) && dataPoint.AxisLabel.Length > 0)
{
CustomLabels[pointIndx].Text = dataPoint.AxisLabel;
}
pointIndx++;
}
}
}
// ***********************************
// Labels are filled from axis scale.
// ***********************************
else
{
if (viewMinimum == viewMaximum)
{
return;
}
double labValue; // Value, which will be converted to text and used for, labels.
double beginPosition; // Begin position for a label
double endPosition; // End position for a label
double start; // Start position for all labels
// Get first series attached to this axis
Series axisSeries = null;
if (axisType == AxisName.X || axisType == AxisName.X2)
{
List <string> seriesArray = ChartArea.GetXAxesSeries((axisType == AxisName.X) ? AxisType.Primary : AxisType.Secondary, SubAxisName);
if (seriesArray.Count > 0)
{
axisSeries = Common.DataManager.Series[seriesArray[0]];
if (axisSeries != null && !axisSeries.IsXValueIndexed)
{
axisSeries = null;
}
}
}
// ***********************************
// Check if the AJAX zooming and scrolling mode is enabled.
// Labels are filled slightly different in this case.
// ***********************************
DateTimeIntervalType offsetType = (labelStyle.GetIntervalOffsetType() == DateTimeIntervalType.Auto) ? labelStyle.GetIntervalType() : labelStyle.GetIntervalOffsetType();
// By default start is equal to minimum
start = viewMinimum;
// Adjust start position depending on the interval type
if (!ChartArea.chartAreaIsCurcular ||
axisType == AxisName.Y ||
axisType == AxisName.Y2)
{
start = ChartHelper.AlignIntervalStart(start, labelStyle.GetInterval(), labelStyle.GetIntervalType(), axisSeries);
}
// Move start if there is start position
if (labelStyle.GetIntervalOffset() != 0 && axisSeries == null)
{
start += ChartHelper.GetIntervalSize(start, labelStyle.GetIntervalOffset(),
offsetType, axisSeries, 0, DateTimeIntervalType.Number, true, false);
}
// ***************************************
// Date type
// ***************************************
if (valueType == ChartValueType.DateTime ||
valueType == ChartValueType.Date ||
valueType == ChartValueType.Time ||
valueType == ChartValueType.DateTimeOffset ||
axisSeries != null)
{
double position = start;
double dateInterval;
// Too many labels
if ((viewMaximum - start) / ChartHelper.GetIntervalSize(start, labelStyle.GetInterval(), labelStyle.GetIntervalType(), axisSeries, 0, DateTimeIntervalType.Number, true) > ChartHelper.MaxNumOfGridlines)
{
return;
}
int counter = 0;
double endLabelMaxPosition = viewMaximum - ChartHelper.GetIntervalSize(viewMaximum, labelStyle.GetInterval(), labelStyle.GetIntervalType(), axisSeries, labelStyle.GetIntervalOffset(), offsetType, true) / 2f;
double endLabelMinPosition = viewMinimum + ChartHelper.GetIntervalSize(viewMinimum, labelStyle.GetInterval(), labelStyle.GetIntervalType(), axisSeries, labelStyle.GetIntervalOffset(), offsetType, true) / 2f;
while ((decimal)position <= (decimal)viewMaximum)
{
dateInterval = ChartHelper.GetIntervalSize(position, labelStyle.GetInterval(), labelStyle.GetIntervalType(), axisSeries, labelStyle.GetIntervalOffset(), offsetType, true);
labValue = position;
// For IsLogarithmic axes
if (IsLogarithmic)
{
labValue = Math.Pow(logarithmBase, labValue);
}
// Check if we do not exceed max number of elements
if (counter++ > ChartHelper.MaxNumOfGridlines)
{
break;
}
if (endLabels == 0 && position >= endLabelMaxPosition)
{
break;
}
beginPosition = position - dateInterval * 0.5;
endPosition = position + dateInterval * 0.5;
if (endLabels == 0 && position <= endLabelMinPosition)
{
position += dateInterval;
continue;
}
if ((decimal)beginPosition > (decimal)viewMaximum)
{
position += dateInterval;
continue;
}
string pointLabel = GetPointLabel(dataSeries, labValue, !seriesXValuesZeros, indexedSeries);
if (pointLabel.Length == 0)
{
// Do not draw last label for indexed series
if (position <= maximum && (position != maximum || !Common.DataManager.Series[dataSeries[0]].IsXValueIndexed))
{
CustomLabels.Add(beginPosition,
endPosition,
ValueConverter.FormatValue(
Common.Chart,
this,
null,
labValue,
LabelStyle.Format,
valueType,
ChartElementType.AxisLabels),
false);
}
}
else
{
// Add a label to the collection
CustomLabels.Add(beginPosition,
endPosition,
pointLabel,
false);
}
position += dateInterval;
}
}
else
{
// ***************************************
// Scale value type
// ***************************************
// Show First label if Start Label position is used
if (start != viewMinimum)
{
endLabels = 1;
}
// Set labels
int labelCounter = 0;
for (double position = start - endLabels * labelStyle.GetInterval(); position < viewMaximum - 1.5 * labelStyle.GetInterval() * (1 - endLabels); position = (double)((decimal)position + (decimal)labelStyle.GetInterval()))
{
// Prevent endless loop that may be caused by very small interval
// and double/decimal rounding errors
++labelCounter;
if (labelCounter > ChartHelper.MaxNumOfGridlines)
{
break;
}
labValue = (double)((decimal)position + (decimal)labelStyle.GetInterval());
// This line is introduce because sometimes 0 value will appear as
// very small value close to zero.
double inter = Math.Log(labelStyle.GetInterval());
double valu = Math.Log(Math.Abs(labValue));
int digits = (int)Math.Abs(inter) + 5;
if (digits > 15)
{
digits = 15;
}
if (Math.Abs(inter) < Math.Abs(valu) - 5)
{
labValue = Math.Round(labValue, digits);
}
// Too many labels
if ((viewMaximum - start) / labelStyle.GetInterval() > ChartHelper.MaxNumOfGridlines)
{
return;
}
// For IsLogarithmic axes
if (IsLogarithmic)
{
labValue = Math.Pow(logarithmBase, labValue);
}
beginPosition = (double)((decimal)position + (decimal)labelStyle.GetInterval() * 0.5m);
endPosition = (double)((decimal)position + (decimal)labelStyle.GetInterval() * 1.5m);
if ((decimal)beginPosition > (decimal)viewMaximum)
{
continue;
}
// Show End label if Start Label position is used
// Use decimal type to solve rounding issues
if ((decimal)((beginPosition + endPosition) / 2.0) > (decimal)viewMaximum)
{
continue;
}
string pointLabel = GetPointLabel(dataSeries, labValue, !seriesXValuesZeros, indexedSeries);
if (pointLabel.Length > 15 && labValue < 0.000001)
{
labValue = 0.0;
}
if (pointLabel.Length == 0)
{
// Do not draw last label for indexed series
if (!(Common.DataManager.Series[dataSeries[0]].IsXValueIndexed && position > maximum))
{
// Add a label to the collection
CustomLabels.Add(beginPosition,
endPosition,
ValueConverter.FormatValue(
Common.Chart,
this,
null,
labValue,
LabelStyle.Format,
valueType,
ChartElementType.AxisLabels),
false);
}
}
else
{
// Add a label to the collection
CustomLabels.Add(beginPosition,
endPosition,
pointLabel,
false);
}
}
}
}
}