quote:

---

Hello,

Try this:

GraphLayer gl = Project.ActiveLayer();
gl.LT_execute("plot -l");

Leo
OriginLab

---

 
#include <Origin.h>
////////////////////////////////////////////////////////////////////////////////////
#define MAX_DAQ_PTS 1000 // max number of points that can be collected
#define MAX_Y		1234
#define MIN_Y		567
#define MIN_X		(-200)
#define MAX_X		500

static void new_data(vector& vx, vector& vy, int& nCounter)
{
	int	nSize = MAX_DAQ_PTS;
	double x0 = 0.3;// center location from 0-1
	double xCtr = x0 * nSize;
	double xWidth = 0.1 * nSize;
	double yHeight = (MAX_Y - MIN_Y) * 0.8;
	double yNoiseLevel = 0.012 * MAX_Y;
	int npts = 10;
	for(int ii = 0; ii < npts; ii++)
	{
		int nx = nCounter++;
	
		double x = MIN_X + (MAX_X - MIN_X) * nx/(nSize - 1.0);
		double y = MIN_Y + yNoiseLevel * rnd() + yHeight * exp(-(nx - xCtr)^2.0 / (PI*xWidth));
		vx.Add(x);
		vy.Add(y);
	}
}

void daq()
{
	// start a new project and with a default wks and make a line plot
	LT_execute("doc -s");// turn off asking to save OPJ
	Project.Open(NULL);
	Worksheet wks = Project.ActiveLayer();
	if(!wks)
		return;// default new project not having a wks
	wks.SetSize(MAX_DAQ_PTS, 2); //this will prepare the wks with the needed size so can be faster when adding data
	
	// we need these later
	string strDataX = wks.Columns(0).GetDatasetName();
	string strDataY = wks.Columns(1).GetDatasetName();
	
	GraphPage gp;
	gp.Create("Line");// create new graph window with the Line.OTP template
	GraphLayer gl = gp.Layers();
	Curve cc(strDataX, strDataY);
	int nPlot = gl.AddPlot(cc, IDM_PLOT_LINE);
	
	// prepare graph scale
	Scale ax(gl.X);
	Scale ay(gl.Y);
	ax.From = MIN_X;
	ax.To = MAX_X;
	ay.From = MIN_Y;
	ay.To = MAX_Y;
	
	Dataset dx(strDataX);
	Dataset dy(strDataY);
	// we start out with range reset to 0
	dx.SetUpperIndex(-1);
	dy.SetUpperIndex(-1);
	// give some time to allow Origin to finish with graph initialization
	LT_execute("sec -p 0.2");

	out_str("DAQ starting...");
	int nCount = 0;
	int nn = 0;
	do
	{
		vector vx, vy;
		new_data(vx, vy, nCount);
		dx.Append(vx, REDRAW_REALTIME);
		dy.Append(vy, REDRAW_REALTIME);
		// allow Origin time to do the drawing and also to allow control of other things
		// and to allow typing into script window etc
		LT_execute("sec -p 0.1"); // the gap of 0.1 sec can be adjusted according to collection rate
		string str;
		str.Format("collecting, index = %d", nn);
		SetDataDisplayText(str);
	} while((nn = dy.GetUpperIndex()) < MAX_DAQ_PTS);
	
	out_str("DAQ finished");
}

quote:

---

Yes, it worked but I couldn�t see "realtime" how the graph is drawing. I added this: the lines after ->
now it seems to work well.

do
{
vector vx, vy;
new_data(vx, vy, nCount);
dx.Append(vx, REDRAW_REALTIME);
dy.Append(vy, REDRAW_REALTIME);
// allow Origin time to do the drawing and also to allow control of other things
// and to allow typing into script window etc
->GraphLayer gl = Project.ActiveLayer();
->gl.LT_execute("plot -l");
->gl.Rescale();
LT_execute("sec -p 0.2"); // the gap of 0.1 sec can be adjusted according to collection rate
string str;
str.Format("collecting, index = %d", nn);
SetDataDisplayText(str);
} while((nn = dy.GetUpperIndex()) < MAX_DAQ_PTS);

---

 Yes, it worked but I couldnt see "realtime" how the graph is drawing. I added this: the lines after -> 
now it seems to work well. 

quote:

---

 Yes, it worked but I couldnt see "realtime" how the graph is drawing. I added this: the lines after -> 
now it seems to work well. 

Hi Tony,

Proper realtime update via the Append command to Dataset maybe not working in your version of Origin, and that was why you need to add code like rescale to force a redraw, which is much slower then the intrisic realtime mechanism.

If you have Origin 7.5, then my original code would compile and you should see a smooth realtime drawing of the data without the flashing of the entire graph.


CP

---