private void UpdateChartStats()
{
if (DataPoints == null || DataPoints.Count == 0) return;
double min = DataPoints[0], max = DataPoints[0];
// For trending
double xxSum = 0, xySum = 0, xAxisValuesSum = 0, yAxisValuesSum = 0;
Sum = Math.Abs(DataPoints[0]);
for (int i = 1; i < DataPoints.Count; i++)
{
double value = DataPoints[i];
if (value < min) min = value;
if (value > max) max = value;
Sum += Math.Abs(value);
xySum += value * (i + 1);
xxSum = value * value;
yAxisValuesSum += value;
xAxisValuesSum += i + 1;
}
double slope = 0, intercept = 0, start = 0, end = 0;
try
{
slope = ((DataPoints.Count * xySum) - (xAxisValuesSum * yAxisValuesSum)) /
((DataPoints.Count * xxSum) - (xAxisValuesSum * xAxisValuesSum));
}
catch (DivideByZeroException) { }
intercept = (yAxisValuesSum - (slope * xAxisValuesSum)) / DataPoints.Count;
start = Math.Max(0, (slope * DataPoints[0]) + intercept);
end = (slope * DataPoints[DataPoints.Count - 1]) + intercept;
this.TrendInfo = new TrendInfo(slope, intercept, start, end);
if(double.IsNaN(DataPointMaxValue))
DataPointMaxValue = max;
if(double.IsNaN(DataPointMinValue))
DataPointMinValue = min;
}
/// <summary>
/// Initializes a new instance of the MicroChartRenderInfo structure.
/// </summary>
/// <param name="dataPoints"></param>
/// <param name="graphics"></param>
/// <param name="chartWidth"></param>
/// <param name="chartHeight"></param>
public MicroChartRenderInfo(List<double> dataPoints, Graphics graphics, int chartWidth, int chartHeight, double dataMax, double dataMin)
{
DataPoints = dataPoints;
Graphics = graphics;
ChartWidth = chartWidth;
ChartHeight = chartHeight;
MicroChartHotPoints = null;
DataPointMaxValue = dataMax;
DataPointMinValue = dataMin;
Sum = 0;
TrendInfo = new TrendInfo();
UpdateChartStats();
}