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how to force ImageView snippet to update in RT [message #9386]

Thu, 03 May 2007 17:47

ebojd
Messages: 225
Registered: January 2007
Location: USA

Experienced Member

I have some code that will eventually be a Real-Time graphics display. I am able to generate the proper images (via a libized version of Gnuplot)... I used a snippet of ImageView to load the image into a window:

void 
DCP::Load(const char *filename)
{
	img.SetImage(Null);
	FileIn in(filename);
	One<StreamRaster> r = StreamRaster::OpenAny(in);
	if(!r)
		return;
	Size rsz = img.GetSize();
	Size isz = r->GetSize();
	if(isz.cx >= rsz.cx || isz.cy >= rsz.cy) {
		if(isz.cx * rsz.cx < rsz.cy * isz.cy)
			rsz.cx = isz.cx * rsz.cy / isz.cy;
		else
			rsz.cy = isz.cy * rsz.cx / isz.cx;
		ImageEncoder m;
		Rescale(m, rsz, *r, isz);
		img.SetImage(m);
	}
	else
		img.SetImage(r->GetImage());
}

This works fine if I want to plot or display a single dataset, but my when my simulator loads up a dataset in a loop (which calls the processing routines and then loads the image):

void 
DCP::rt_sim()
{
	int i, ret;
	for(i=0;i<=320;i++)
	{
		char fname[256];
		
		sprintf (fname,"%s%02d.dat","./gauss_test",i%32);

		ret  = raw_range->read (fname, 0);
		ret |= raw_dat->read   (fname, 1);
		if (ret) {
        	PromptOK("[2R/ ERROR:]&parsing 2D input file in rt_sim");
        	return;
    	        }
    		
		raw_spectrum();
	}
}

nothing is displayed. I assume that the problem is that the load() method does not actually update the display and has to wait until control is given back to the main window.

My questions is: is there some trick to force an update the subwindow?

Thanks,

EBo --

[Updated on: Thu, 03 May 2007 18:09]

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Re: how to force ImageView snippet to update in RT [message #9393 is a reply to message #9386]

Fri, 04 May 2007 15:35

ebojd
Messages: 225
Registered: January 2007
Location: USA

Experienced Member

FYGI,

Well... I seem to have found a solution that works. I am not sure that it is the best, or for that matter safest, but it does work as expected. If anyone would care to comment...

In the code that processes the real-time data I simply added the following:

		bool b;
		Ctrl::ProcessEvents(&b);

It works on the Linux testbed -- soon to copy over to Win-XP and test again.

EBo --

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Re: how to force ImageView snippet to update in RT [message #9395 is a reply to message #9386]

Fri, 04 May 2007 20:02

mirek
Messages: 13975
Registered: November 2005

Ultimate Member

ebojd wrote on Thu, 03 May 2007 11:47

		sprintf (fname,"%s%02d.dat","./gauss_test",i%32);

String fname = Format("%s%02d.dat","./gauss_test",i%32);

(Could not resist).

As for updates: Yes, to get window repainted, it needs to recieve events. Call ProcessEvents() is exactly what you need here.... (no need to supply quit IMO).

Mirek

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