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I'm trying to use the AChartEngine library using a time series. The X axis is time, and Y axis are integer values.

The problem is that I could not setup a renderer.setXAxisMin and Max for the X axis for time. Either all the data points are crumbed together, or the time is apart so large that I cannot see any datapoints.

This is the classes I've used:

    //For Chart 1
private static Random random = new Random();
private static TimeSeries timeSeries;
private static XYMultipleSeriesDataset dataset;
private static XYMultipleSeriesRenderer renderer;
private static XYSeriesRenderer rendererSeries;
private static GraphicalView view;

Initialization:

    if(timeSeries == null)
    {
        //Chart 1
        dataset = new XYMultipleSeriesDataset();
        renderer = new XYMultipleSeriesRenderer();
        timeSeries = new TimeSeries("Channel 1");
        rendererSeries = new XYSeriesRenderer();
    }

Renderer:

    //For Chart 1
    renderer.setAxesColor(Color.BLUE);
    renderer.setAxisTitleTextSize(16);
    renderer.setChartTitle("Real Time Seizure Monitoring Graph");
    renderer.setChartTitleTextSize(15);
    renderer.setFitLegend(true);
    renderer.setGridColor(Color.LTGRAY);
    renderer.setPanEnabled(true, true);
    renderer.setPointSize(1);
    renderer.setXTitle("Time");
    renderer.setYTitle("Amplitude (DAC)");
    renderer.setMargins( new int []{60, 60, 60, 60});
    renderer.setZoomButtonsVisible(false);
    renderer.setBarSpacing(10);
    renderer.setShowGrid(true);
    renderer.setLabelsColor(Color.BLUE);
    renderer.setApplyBackgroundColor(true);
    renderer.setBackgroundColor(Color.BLACK);
    renderer.setAxisTitleTextSize(16);
    renderer.setChartTitleTextSize(20);
    renderer.setLabelsTextSize(15);
    renderer.setLegendTextSize(15);
    renderer.setZoomButtonsVisible(false);
    renderer.setPointSize(5);
    renderer.setXLabels(10);
    renderer.setYLabels(10);
    renderer.setShowGrid(true);
    renderer.setXLabelsAlign(Align.CENTER);
    renderer.setYLabelsAlign(Align.RIGHT);
    renderer.setInScroll(true);
    renderer.setXLabels(5);
    //renderer.setXAxisMin(0.00000001);
    //renderer.setXAxisMax(new Date().getTime());
    //renderer.setXAxisMin(100);
    //renderer.setXAxisMax(1000000);
    renderer.addSeriesRenderer(rendererSeries);
    rendererSeries.setFillPoints(true);
    rendererSeries.setPointStyle(PointStyle.CIRCLE);
    rendererSeries.setColor(Color.RED);

Adding the datasets and series:

    //Setting for Chart 1
    dataset.addSeries(timeSeries);
    view = ChartFactory.getTimeChartView(this, dataset, renderer, "Real Time Seizure Monitoring Graph");
    view.refreshDrawableState();
    view.repaint();

Function to start inserting random variables:

void startTest()
{   
    mThread = new Thread()
    {
        public void run()
        {
            while(true)
            {
                try 
                {
                    Thread.sleep(2000L);
                }
                catch (InterruptedException e) 
                {
                    e.printStackTrace();
                }
                //Chart 1 Random Data
                int someInt = random.nextInt(4096);
                timeSeries.add(new Date(), someInt);
                timeSeries.addAnnotation(new Date().toString(), new Date().getTime(), someInt);
                view.refreshDrawableState();
                view.repaint();
            }
        }
    };
    mThread.start();
}

}

Without the set X axis min and max commented, the datapoints are updated with no problems, and all points are visible.

Furthermore, if there a lot of data points created by the thread, the panning appears to be very slow.

4

1 回答 1

2

X 轴最小值应该是添加到系列中的第一个值附近的某个值。X 轴最大值应该是系列中最后一个值附近的某个值。

无论如何，这取决于您希望在图表中拥有的可见范围。正如我在您的注释行中看到的那样，将值设置为 100 意味着 X 轴上的最小可见值是 1970 年，这使得所有值都挤在图表右侧的某个地方。

于 2013-08-12T08:08:21.713 回答