add set modifier example

https://my.originlab.com/forum/topic.asp?TOPIC_ID=47227

Author: JasmineOLab

Graphing/SetPlotModifier.cpp

@@ -0,0 +1,99 @@
+
+////////////////////////////////////////////////////////////////////////////////////
+//This example is about set plot's modifier
+////////////////////////////////////////////////////////////////////////////////////
+
+#include <Origin.h>
+
+//use SetModifier to set plot label
+void set_label_by_SetModifier()
+{
+	//prepare data
+	Worksheet wks;
+	wks.Create("origin");
+	if(!wks)
+		return;
+	wks.AddCol();
+	
+	vector vn = {1,2,3,4,5};
+	for(int ii = 0; ii < 3; ii++)
+	{
+		Dataset ds(wks, ii);
+		ds = vn;
+	}
+	
+	//plot
+	DataRange dr;	
+	dr.Add(wks, 0, "X");
+	dr.Add(wks, 1, "Y");
+	
+	GraphPage gp;
+	gp.Create("Origin");
+	GraphLayer gl = gp.Layers();	
+	gl.AddPlot(dr, IDM_PLOT_SCATTER);
+	gl.Rescale();
+	
+	//set label
+	Column col(wks, 2);
+	DataPlot dp = gl.DataPlots(0); 
+	if(!dp)
+		return;
+	dp.SetModifier(COLDESIG_PLOTLABEL_FORM, col);//see PlotDesignationEx for more modifier types.
+	
+	vector<int> vnDesigs;
+	vector<string> saNames;
+	dp.GetModifiers(vnDesigs, saNames);
+	
+	vector<uint> vecIndex;
+	if(vnDesigs.Find(vecIndex, COLDESIG_PLOTLABEL_FORM) > 0) 
+	{
+		printf("label form = %s\n", saNames[ vecIndex[0] ]);
+	}
+}
+
+//use ApplyFormat to set plot label
+void set_label_by_applyformat()
+{
+	//prepare data
+	Worksheet wks;
+	wks.Create("origin");
+	if(!wks)
+		return;
+	wks.AddCol();
+	
+	vector vn = {1,2,3,4,5};
+	for(int ii = 0; ii < 3; ii++)
+	{
+		Dataset ds(wks, ii);
+		ds = vn;
+	}
+	
+	//plot
+	DataRange dr;	
+	dr.Add(wks, 0, "X");
+	dr.Add(wks, 1, "Y");
+	
+	GraphPage gp;
+	gp.Create("Origin");
+	GraphLayer gl = gp.Layers();	
+	gl.AddPlot(dr, IDM_PLOT_SCATTER);
+	gl.Rescale();
+	
+	//set label
+	DataPlot dp = gl.DataPlots(0);
+	if(dp)
+	{		
+		Tree trFmt;
+		TreeNode trEnable = trFmt.Root.Label.AddNode("Enable");
+		trEnable.nVal = 1;
+		
+		OQCOLOR nLab;
+		int ycol = 1, labelcol = 2;
+		//convert the offset(modifier column to y column) to theme internal value
+		okutil_get_ocolor_by_col(&nLab, labelcol, ycol, SYMB_COLOR_COLTYPE_INDEX);
+		
+		trFmt.Root.Label.Form.nVal = nLab;
+		if ( 0 == dp.UpdateThemeIDs(trFmt.Root) )
+			dp.ApplyFormat(trFmt, true, true);
+	}	
+}