C# Altaxo.EnsureValidityOfCurrentLayerNumber方法代码示例

		/// <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;
    }

    public override void Run(Altaxo.Graph.GUI.GraphController ctrl)
    {
      FunctionEvaluationScript script = null; // 

      if(script==null)
        script = new FunctionEvaluationScript();

      object[] args = new object[]{script,new ScriptExecutionHandler(this.EhScriptExecution)};
      if(Current.Gui.ShowDialog(args, "Function script"))
      {
        ctrl.EnsureValidityOfCurrentLayerNumber();

        script = (FunctionEvaluationScript)args[0];
        XYFunctionPlotItem functItem = new XYFunctionPlotItem(new XYFunctionPlotData(script),new G2DPlotStyleCollection(LineScatterPlotStyleKind.Line));
        ctrl.Doc.Layers[ctrl.CurrentLayerNumber].PlotItems.Add(functItem);
      }
    }