/// <summary>
/// Retrieves the data points of the current active plot.
/// </summary>
/// <param name="ctrl">The graph controller which controls the graph from which the points are to retrieve.</param>
/// <param name="xarr">The array of the data point's x values.</param>
/// <param name="yarr">The array of the data point's y values.</param>
/// <returns>Null if all is ok, or error message if not.</returns>
public static string GetActivePlotPoints(Altaxo.Gui.Graph.Gdi.Viewing.IGraphController ctrl, out double[] xarr, out double[] yarr)
{
List<double> xlist = new List<double>();
List<double> ylist = new List<double>();
xarr = yarr = null;
ctrl.EnsureValidityOfCurrentLayerNumber();
ctrl.EnsureValidityOfCurrentPlotNumber();
var xylayer = ctrl.ActiveLayer as XYPlotLayer;
if (null == xylayer || ctrl.CurrentPlotNumber < 0)
return "No active plot available";
IGPlotItem plotItem = xylayer.PlotItems.Flattened[ctrl.CurrentPlotNumber];
XYColumnPlotItem xyPlotItem = plotItem as XYColumnPlotItem;
if (xyPlotItem == null)
return "No active plot!";
XYColumnPlotData data = xyPlotItem.XYColumnPlotData;
if (data == null)
return "Active plot item has no data";
if (!(data.XColumn is Altaxo.Data.INumericColumn) || !(data.YColumn is Altaxo.Data.INumericColumn))
return "X-Y values of plot data are not both numeric";
Altaxo.Data.INumericColumn xcol = (Altaxo.Data.INumericColumn)data.XColumn;
Altaxo.Data.INumericColumn ycol = (Altaxo.Data.INumericColumn)data.YColumn;
int maxRowIndex = data.GetMaximumRowIndexFromDataColumns();
foreach (int i in data.DataRowSelection.GetSelectedRowIndicesFromTo(0, maxRowIndex, data.DataTable?.DataColumns, maxRowIndex))
{
double x = xcol[i];
double y = ycol[i];
if (double.IsNaN(x) || double.IsNaN(y))
continue;
xlist.Add(x);
ylist.Add(y);
}
xarr = xlist.ToArray();
yarr = ylist.ToArray();
return null;
}
/// <summary>
/// Retrieves the data points of the current active plot.
/// </summary>
/// <param name="ctrl">The graph controller which controls the graph from which the points are to retrieve.</param>
/// <param name="xarr">The array of the data point's x values.</param>
/// <param name="yarr">The array of the data point's y values.</param>
/// <param name="nPlotPoints">The number of plot points (may be smaller than the length of x and y arrays.</param>
/// <returns>Null if all is ok, or error message if not.</returns>
public static string GetActivePlotPoints(Altaxo.Graph.GUI.GraphController ctrl, ref double[]xarr, ref double[] yarr, out int nPlotPoints)
{
nPlotPoints=0;
ctrl.EnsureValidityOfCurrentLayerNumber();
ctrl.EnsureValidityOfCurrentPlotNumber();
IGPlotItem plotItem = ctrl.ActiveLayer.PlotItems.Flattened[ctrl.CurrentPlotNumber];
XYColumnPlotItem xyPlotItem = plotItem as XYColumnPlotItem;
if(xyPlotItem==null)
return "No active plot!";
XYColumnPlotData data = xyPlotItem.XYColumnPlotData;
if(data==null)
return "Active plot item has no data";
if(!(data.XColumn is Altaxo.Data.INumericColumn) || !(data.YColumn is Altaxo.Data.INumericColumn))
return "X-Y values of plot data are not both numeric";
Altaxo.Data.INumericColumn xcol = (Altaxo.Data.INumericColumn)data.XColumn;
Altaxo.Data.INumericColumn ycol = (Altaxo.Data.INumericColumn)data.YColumn;
int n = data.PlottablePoints;
if(null==xarr || xarr.Length<n)
xarr = new double[n];
if(null==yarr || yarr.Length<n)
yarr = new double[n];
int end = data.PlotRangeEnd;
int j=0;
for(int i=data.PlotRangeStart;i<end && j<n;i++)
{
double x = xcol[i];
double y = ycol[i];
if(double.IsNaN(x) || double.IsNaN(y))
continue;
xarr[j] = x;
yarr[j] = y;
++j;
}
nPlotPoints = j;
return null;
}
