void plot_color_from_col()
{
	Worksheet wks = Project.ActiveLayer();  // get worksheet with group.dat data	
	// plot simple scatter plot
	DataRange dr;
	dr.Add(wks, 0, "X");
	dr.Add(wks, 1, "Y");
	
	GraphPage gp;
	gp.Create("scatter");  // create scatter graph	
	GraphLayer gl = gp.Layers(0);
	int nPlot = gl.AddPlot(dr, IDM_PLOT_SCATTER);  // add plot to layer
	gl.Rescale();

	DataPlot dp = gl.DataPlots(nPlot);
	dp.SetSymbol(12);   // set symbol shape: empty circle
	//LT color function color(offset, type), type: n=index, r=RGB, m=colormap
	double vv;LT_evaluate("color(1,n)",&vv);
	int oColor = (int)vv;
	dp.SetColor(oColor);
}

import originpro as op
wks = op.find_sheet()#assume active XYY data
graph = op.new_graph(template='scatter')
layer = graph[0]
plot = layer.add_plot(wks, coly=1, colx=0)
layer.rescale()
plot.color = op.color_col(1)# the +1 column