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PtMTrendAddData(), PtMTrendChangeData()

Add or change data for a PtMTrend widget

Synopsis:

void PtMTrendAddData( PtWidget_t *widget,
                      unsigned graph_no,
                      const int *newdata,
                      unsigned nsamples );


void PtMTrendChangeData( PtWidget_t *widget,
                         unsigned graph_no,
                         int const *newdata,
                         unsigned last_sample,
                         unsigned nsamples );

Arguments:

widget

A pointer to a widget of type PtMTrend.

graph_no

The number of the graph to be added to or changed, in the range 0 to trend count - 1, inclusive.

newdata

A pointer to an array of the new data (see below).

nsamples

The number of samples in the array.

last_sample (PtMTrendChangeData() only)

The index of the newest sample to replace, where 0 is considered to be the index of the most recently added sample.

Description:

PtMTrendAddData() lets you add data for a PtMtrend, while PtMTrendChangeData() lets you change existing data.

The newdata array is ordered with the oldest sample at newdata[0], and the newest at newdata[nsamples - 1]. The oldest sample to be replaced has an index of last_sample + nsamples - 1;

The samples in the trend are replaced as follows:

• trend sample[last_sample] = newdata[nsamples - 1].
• trend sample[last_sample + 1] = newdata[nsamples - 2].
• ...
• trend sample[last_sample + nsamples - 1] = newdata[0].

If last_sample + nsamples - 1 is outside the range of samples for the widget, some initial portion of the new data is discarded.

Classification:

Photon