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T O P I C    R E V I E W
alex_eagle Posted - 10/17/2003 : 06:11:50 AM
I tried to access the %C system variable when looping through the dataplots in a graph by using foreach and collections.
Somewhere in the help file it says that Labtalk does not support collections. Does that mean that I cannot use a foreach loop through the dataplots and access %C to get the active plot.
The solution which works for me is shown below. It simply uses
the doc -e command in a C function.

void Integ(double low, double high){
LT_set_var("LOW", low);
LT_set_var("HIGH", high);
LT_execute("doc -e D {
integrate %C -b LOW -e HIGH;
integ.area = ;};");
}

Can this be done in "pure" C ?
1   L A T E S T    R E P L I E S    (Newest First)
cpyang Posted - 10/17/2003 : 08:08:48 AM
The following code will show you how, but I notice a problem. After the correct integration, this line

crvMyCurve.SetLowerBound(save_i1);

is not restoring the plot lower bound to the original, looks like a bug.


CP

 

void integ_all(int i1 = 0, int i2 = -1)
{

	GraphLayer gl = Project.ActiveLayer();
	if(!gl)
		return;
	
	printf("Plot\tName\tArea\n");
	int nPlot = 1;
	int save_i1, save_i2;
	foreach(DataPlot dp in gl.DataPlots)
	{
		Curve crvMyCurve(dp);
		if(i2 > i1)
		{
			save_i1 = crvMyCurve.GetLowerBound();
			save_i2 = crvMyCurve.GetUpperBound();
			crvMyCurve.SetLowerBound(i1);
			crvMyCurve.SetUpperBound(i2);
		}
		IntegrationResult irMyResults;					// Origin C structure to store integration results 
		Curve_integrate( &crvMyCurve, &irMyResults); // Perform integration	
		printf("%d\t%s\t%f\n", nPlot++, crvMyCurve.GetName(), irMyResults.Area );
		if(i2 > i1)
		{
			crvMyCurve.SetLowerBound(save_i1);
			crvMyCurve.SetUpperBound(save_i2);
		}
		
	}
}

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