[scilab-Users] Question on using plot in call_scilab module

[Sylvestre Ledru]

Thanks for sharing this.

Managing Scilab graphics and Scilab windows from call_scilab & Javasci
v2 is something I would like to improve in the next releases but I am
still unsure on the right way to implement this...

If you have ideas, I would be happy to hear them.

Sylvestre


Le mercredi 26 janvier 2011 à 11:26 +0000, Mike Page a écrit :
> Hi Norm,
> 
> Sorry if this response is too late for you, but it may help somebody else...
> 
> I came across your post while looking for help on another issue related to
> plotting with SendScilabJob.  Here is some example code that runs the
> plotting in a separate thread under WinXp.  It works for me and I think it
> would do what you wanted.  Sorry it's a bit short on comments ;-)
> 
> To build this, you need to also include the /include directories from:
> SCI/modules/call_scilab
> SCI/modules/api_scilab
> SCI/modules/core
> 
> You also need to set the library path to include SCI/bin and include the
> libraries:
> api_scilab.lib
> call_scilab.lib
> MALLOC.lib
> LibScilab.lib
> 
> When running, /SCI/bin needs to be in your path so Scilab can find the DLLs.
> 
> HTH.
> Mike.
> 
> /*--------------------------------------------------------------------------
> */
> #include <windows.h>
> #include <stdio.h>
> #include <process.h>
> #include "call_scilab.h"
> #include "api_scilab.h"
> 
> 
> HANDLE	PlotCmd[2];
> HANDLE	Reply;
> double	x[100];
> double	y[100];
> 
> 
> /*--------------------------------------------------------------------------
> */
> static void SciPlot (void* Params)
> {
> 	DWORD	Event;
> 	BOOL	Exit = FALSE;
> 
> 	if (StartScilab (NULL, NULL, 0) == FALSE)
> 	{
> 		printf ("Error : StartScilab\n");
> 	}
> 
> 	Reply = CreateEvent (NULL, FALSE, FALSE, NULL);
> 
> 	while (!Exit)
> 	{
> 		Event = WaitForMultipleObjects (2, PlotCmd, FALSE, INFINITE);
> 
> 		switch (Event)
> 		{
> 			case	(WAIT_OBJECT_0 + 0):
> 			{
> 				createNamedMatrixOfDouble (pvApiCtx, "x", 1, 100, x);
> 				createNamedMatrixOfDouble (pvApiCtx, "y", 1, 100, y);
> 				SendScilabJob ("delete (e);");
> 				SendScilabJob ("plot2d(x,y);");
> 				SendScilabJob ("e = gce ();");
> 				printf ("...Plot started\n");
> 				SetEvent (Reply);
> 				break;
> 			}
> 			case	(WAIT_OBJECT_0 + 1):
> 			{
> 				Exit = TRUE;
> 				break;
> 			}
> 		}
> 	}
> 
> 	if (TerminateScilab (NULL) == FALSE)
> 	{
> 		printf ("Error : TerminateScilab\n");
> 	}
> 
> 	SetEvent (Reply);
> }
> 
> /*--------------------------------------------------------------------------
> */
> int main(void)
> {
> 	int	i, j;
> 
> 	printf ("Starting\n");
> 	PlotCmd[0] = CreateEvent (NULL, FALSE, FALSE, NULL);
> 	PlotCmd[1] = CreateEvent (NULL, FALSE, FALSE, NULL);
> 	_beginthread (SciPlot, 0, NULL);
> 	Sleep (1000);
> 
> 	for (j=1; j<100; j++)
> 	{
> 		x[j] = j;
> 	}
> 
> 	for (i=0; i<10; i++)
> 	{
> 		for (j=1; j<100; j++)
> 		{
> 			y[j] = (2.0 *(double)rand () / (double)RAND_MAX) - 1.0;
> 		}
> 		printf ("Update Plot\n");
> 		SetEvent (PlotCmd[0]);
> 		WaitForSingleObject (Reply, INFINITE);
> 		Sleep (1000);
> 	}
> 	printf ("Terminate Plot\n");
> 	SetEvent (PlotCmd[1]);
> 	WaitForSingleObject (Reply, INFINITE);
> 	CloseHandle (PlotCmd[0]);
> 	CloseHandle (PlotCmd[1]);
> 	return 0;
> }
> /*--------------------------------------------------------------------------
> */
> 
> 
> 
> -----Original Message-----
> From: Norman Beamish [mailto:norman.beamish at m4s.be]
> Sent: 03 June 2010 11:13
> To: users at lists.scilab.org
> Subject: [scilab-Users] Question on using plot in call_scilab module
> 
> 
> Hi,
> 
> I'm using the call_scilab module to access scilab functions from within
> a C program.  I'm using MS Visual C++ 2008 on MS Vista.
> 
> Everything that just writes its output to the console works ok.  However
> when I use the scilab plot command
>       SendScilabJob("plot(x,y, style);")
> I find that the plot window freezes and the plot menu options are
> unavailable unless I run the following loop: -
>     while( ScilabHaveAGraph() )
>     {
>         ScilabDoOneEvent();
>     }
> Of course this loop stops my program from doing anything else.
> 
> My question:
> I believe this problem arises because everything is operating in a
> single thread.  Is there a way to make the plot command start out in a
> separate thread so that it can still monitor for user events such as
> mouse clicks while the rest of my program continues.
> 
> thanks,
> Norm
> 
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