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Initializing TimeGroupDataset

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[quote][i]Originally posted by rixmith[/i]
[br]I created a OHLCPlot based on a TimeGroupDataset and the example code of DataLoggerView. When I create the dataset using the constructor

TimeGroupDataset(java.lang.String sname, java.util.GregorianCalendar[] x, double[][] y)

everything works perfect. However, when I create the dataset using the default TimeGroupDataset constructor and add the data points one at a time (as is done in the DataLoggerView example) my plot does not show up. As points are added to the dataset I confirmed that the number of points in the dataset is increasing by 1, I can see the scale and the axises being updated correctly on the chart, but no data points are displayed.

When using the default TimeGroupDataset constructor do I have to do some setup before the OHLCPlot will recognize the datapoints?

I notice that the DataLoggerView example preloads some datapoints through the TimeGroupDataset constructor. My question could also be worded as: how would you make the DataLoggerView example work if it had to start with an empty dataset?

Rick
[/quote]

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T O P I C R E V I E W
rixmith	Posted - 30 Oct 2009 : 12:12:38 I created a OHLCPlot based on a TimeGroupDataset and the example code of DataLoggerView. When I create the dataset using the constructor TimeGroupDataset(java.lang.String sname, java.util.GregorianCalendar[] x, double[][] y) everything works perfect. However, when I create the dataset using the default TimeGroupDataset constructor and add the data points one at a time (as is done in the DataLoggerView example) my plot does not show up. As points are added to the dataset I confirmed that the number of points in the dataset is increasing by 1, I can see the scale and the axises being updated correctly on the chart, but no data points are displayed. When using the default TimeGroupDataset constructor do I have to do some setup before the OHLCPlot will recognize the datapoints? I notice that the DataLoggerView example preloads some datapoints through the TimeGroupDataset constructor. My question could also be worded as: how would you make the DataLoggerView example work if it had to start with an empty dataset? Rick
2 L A T E S T R E P L I E S (Newest First)
rixmith	Posted - 31 Oct 2009 : 21:47:51 Thank you for the quick response. Works like a charm now. Rick
quinncurtis	Posted - 30 Oct 2009 : 12:48:28 You have to establish the number of groups, which is 4 for an OHLC plot. So you can't use the default constructor. Use the constructor below, which specifies 4 groups, and 0 initial data values. Then add each new set of values. TimeGroupDataset Dataset1 = new TimeGroupDataset("TimeGroupDataset", 4, 0); for (i = 0; i < nNumPnts; i++) { double [] yvalues = {stockPriceData[0][i], stockPriceData[1][i], stockPriceData[2][i], stockPriceData[3][i]}; Dataset1.addTimeGroupDataPoints(xValues[i], yvalues); }

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