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ChartConstants.rBadDataValue displays temp line

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johnbutler

23 Posts

Posted - 09 Nov 2005 : 09:53:28

I am trying to show breaks in data sets on a dynamic chart. I am using the SimpleDataset class to hold the data. When I set a point's x or y value to ChartConstants.rBadDataValue to make that point not valid, the chart temporarily displays a line off the graph. Is there another way to specify a point as not valid and thereby show a break in the series?

quinncurtis

1164 Posts

Posted - 09 Nov 2005 : 10:10:33

Use the datasets setValidData method.

For example, mark the data point an index 23 as bad.

dataset1.setValidData(23, false);

johnbutler

23 Posts

Posted - 09 Nov 2005 : 11:10:18

When I do the following, the series line temporarily goes to 0.

datasets[i].addDataPoint(0, time); datasets[i].setValidData(datasets[i].getNumberDatapoints()-1, false);

quinncurtis

1164 Posts

Posted - 09 Nov 2005 : 12:57:02

We cannot reproduce the problem you describe.

See if you can reproduce the problem by modifying one of our example programs, say the MultiLine class in the Multiline example program. That's what we did, updating the graphs dataset incrementally using a timer, marking every 10th data point invalid, and we could not see any of the lines going to zero. The update routine looks like:

void updateChart()
   {  double y[] = new double[numGroups];
    
       int j;
      double x =  (double)count * 0.2;
      for (j = 0; j < numGroups; j++)
         y[j] = (double) 5 * j;

      Dataset1.addGroupDataPoints(x, y);
      if ((count % 10) == 0)
      {
        Dataset1.setValidData(count-1, false);
        gWG.updateDraw();
      }
      count++;
   }

johnbutler

23 Posts

Posted - 10 Nov 2005 : 07:41:58

The multiline example I have is not dynamic and doesn't have an updateChart method. I tried modifying the example dynamiccharts.

I modified MixedPlotDynamic as follows:

int count = 0;
void updateDynGraph()
{ double y[];
int i;
count++;

...
...

Dataset4.setDataPoint(numPoints-1, 10.0 * numPoints, 40 + 20 * (0.5 - Math.random()));

if (count%5 == 0)
//Dataset3.setValidData(numPoints-1, false);
Dataset3.setDataPoint(numPoints-1, 10.0 * numPoints,
ChartConstants.rBadDataValue);

gWG.repaint();
}

I also modified the timer to be 500ms to allow me to see the effect. First, when I used setValidData I did not see a break in the line (series) that I was exepecting. Second, when I used rBadDataValue, the line temporarily flashed up to infinity but then showed the break.

quinncurtis

1164 Posts

Posted - 10 Nov 2005 : 08:33:36

Your example looks wrong. The code that you have will only affect the last point, since the value of numPoints is fixed. We changed it to


    Dataset1.setDataPoint(numPoints-1, 10.0 * numPoints,  20 + 20 * (0.5 - Math.random()));
    Dataset2.setDataPoint(numPoints-1, 10.0 * numPoints, 30 + 15 * (0.5 - Math.random()));
    Dataset3.setDataPoint(numPoints-1, 10.0 * numPoints, 50 + 20 * (0.5 - Math.random()));
    for (i=0; i < numPoints; i++)
    {
      if ((i % 5) == 0)
	    Dataset3.setValidData(i, false);
    }
    Dataset4.setDataPoint(numPoints-1, 10.0 * numPoints, 40 + 20 * (0.5 - Math.random()));

and it showed breaks in the line as we expect.

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