/// <summary>
/// Gets the symbol size for the index idx.
/// </summary>
/// <param name="idx"></param>
/// <returns></returns>
private double GetSymbolSize(int idx)
{
var dataColumn = DataColumn;
if (null != dataColumn)
{
var val = _scale.PhysicalToNormal(dataColumn[idx]);
if (val >= 0 && val <= 1)
{
if (_numberOfSteps > 0)
{
val = val < 1 ? (Math.Floor(val * _numberOfSteps) + 0.5) / _numberOfSteps : (_numberOfSteps - 0.5) / _numberOfSteps;
}
return(_symbolSizeAt0 + val * (_symbolSizeAt1 - _symbolSizeAt0));
}
else if (val < 0)
{
return(_symbolSizeBelow);
}
else if (val > 1)
{
return(_symbolSizeAbove);
}
else
{
return(_symbolSizeInvalid);
}
}
else
{
return(_symbolSizeInvalid);
}
}
/// <summary>
/// Gets the color for the index idx.
/// </summary>
/// <param name="idx">Index into the row of the data column.</param>
/// <returns>The calculated color for the provided index.</returns>
private Color GetColor(int idx)
{
var dataColumn = DataColumn;
if (null != dataColumn)
{
return(_colorProvider.GetColor(_scale.PhysicalToNormal(dataColumn[idx])));
}
else
{
return(_colorProvider.GetColor(double.NaN));
}
}
/// <summary>
/// This will create a point list out of the data, which can be used to plot the data. In order to create this list,
/// the function must have knowledge how to calculate the points out of the data. This will be done
/// by a function provided by the calling function.
/// </summary>
/// <param name="layer">The plot layer.</param>
/// <returns>An array of plot points in layer coordinates.</returns>
public Processed2DPlotData GetRangesAndPoints(
Gdi.IPlotArea layer)
{
const int functionPoints = 1000;
const double MaxRelativeValue = 1E6;
// allocate an array PointF to hold the line points
PointF[] ptArray = new PointF[functionPoints];
Processed2DPlotData result = new Processed2DPlotData();
MyPlotData pdata = new MyPlotData();
result.PlotPointsInAbsoluteLayerCoordinates = ptArray;
double[] xPhysArray = new double[functionPoints];
double[] yPhysArray = new double[functionPoints];
pdata._xPhysical = xPhysArray;
pdata._yPhysical = yPhysArray;
result.XPhysicalAccessor = new IndexedPhysicalValueAccessor(pdata.GetXPhysical);
result.YPhysicalAccessor = new IndexedPhysicalValueAccessor(pdata.GetYPhysical);
// double xorg = layer.XAxis.Org;
// double xend = layer.XAxis.End;
// Fill the array with values
// only the points where x and y are not NaNs are plotted!
int i, j;
bool bInPlotSpace = true;
int rangeStart = 0;
PlotRangeList rangeList = new PlotRangeList();
result.RangeList = rangeList;
Gdi.G2DCoordinateSystem coordsys = layer.CoordinateSystem;
NumericalScale xaxis = layer.XAxis as NumericalScale;
NumericalScale yaxis = layer.YAxis as NumericalScale;
if (xaxis == null || yaxis == null)
{
return(null);
}
for (i = 0, j = 0; i < functionPoints; i++)
{
double x_rel = ((double)i) / (functionPoints - 1);
double x = xaxis.NormalToPhysical(x_rel);
double y = Evaluate(x);
if (Double.IsNaN(x) || Double.IsNaN(y))
{
if (!bInPlotSpace)
{
bInPlotSpace = true;
rangeList.Add(new PlotRange(rangeStart, j));
}
continue;
}
// double x_rel = layer.XAxis.PhysicalToNormal(x);
double y_rel = yaxis.PhysicalToNormal(y);
// chop relative values to an range of about -+ 10^6
if (y_rel > MaxRelativeValue)
{
y_rel = MaxRelativeValue;
}
if (y_rel < -MaxRelativeValue)
{
y_rel = -MaxRelativeValue;
}
// after the conversion to relative coordinates it is possible
// that with the choosen axis the point is undefined
// (for instance negative values on a logarithmic axis)
// in this case the returned value is NaN
double xcoord, ycoord;
if (coordsys.LogicalToLayerCoordinates(new Logical3D(x_rel, y_rel), out xcoord, out ycoord))
{
if (bInPlotSpace)
{
bInPlotSpace = false;
rangeStart = j;
}
xPhysArray[j] = x;
yPhysArray[j] = y;
ptArray[j].X = (float)xcoord;
ptArray[j].Y = (float)ycoord;
j++;
}
else
{
if (!bInPlotSpace)
{
bInPlotSpace = true;
rangeList.Add(new PlotRange(rangeStart, j));
}
}
} // end for
if (!bInPlotSpace)
{
bInPlotSpace = true;
rangeList.Add(new PlotRange(rangeStart, j)); // add the last range
}
return(result);
}
private Color GetColor(double val)
{
double relval = _scale.PhysicalToNormal(val);
return(_colorProvider.GetColor(relval));
}
