Rockwell-automation FactoryTalk Historian Classic User Guide Manual de usuario descargar pdf (Pagina 150)

Chapter 7 Creating RSBizWare Custom Analysis Tools

double *yMaxIn = new double[yMaxSize];

double *countIn = new double[countInSize];

// Integer to hold data values

int actualNum;

// Convert VARIANT arrays to non-VARIANT arrays

bool xInRet = ExtractVariantDoubleArray(&xInArray, xIn,

xInSize, &actualNum);

bool yMinRet = ExtractVariantDoubleArray(&yMinInArray, yMinIn,

yMinInSize, &actualNum);

bool yMaxRet = ExtractVariantDoubleArray(&yMaxInArray, yMaxIn,

yMaxSize, &actualNum);

bool countInRet = ExtractVariantDoubleArray(&CountInArray,

countIn, countInSize, &actualNum);

3. Create the output arrays. Since an output value is needed for

each input value, the size of the output arrays will be the same

size as the input arrays:

// Create temp double arrays, which can be destroyed after

// they are converted to VARIANT arrays by

// CreateVariantDoubleArray()

double *xOut = new double[xInSize];

double *yOut = new double[xInSize];

4. Change the Y values to negative values. This task would be

simple if you were dealing with single data points; however,

you have to take sampling into consideration because the

passed in data set may be sampled. If it is, the program must

contain an algorithm to determine the value to make negative.

In this program, you negate the average of the minimum and

maximum value passed in for each sample:

// Set first point of horizontal line in output arrays

for (int i = 0; i < xInSize; i++)

{

xOut[i] = xIn[i];

yOut[i] = -1.0 * (yMinIn[i] + yMaxIn[i]) / 2.0;

}

5. Convert the output variables (xOut and yOut) into

VARIANTs so that they can be passed back to the

Configuration Console. Another VARIANT utility function

(

CreateVariantDoubleArray()) is used to do this:

// Convert the temp double arrays to VARIANT arrays to return

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Rockwell-automation FactoryTalk Historian Classic User Guide Manual de usuario Pagina 150