No datapoints visible

[Blogshot]

Hello there!

I'm adding datapoints to my graph. Sadly, the graph neither scrolls to the first point, nor seems to at least update its view. I'm trying to take a list of transactions and display a history of total balance.

My code:

final GraphView graph = findViewById(R.id.graph);

new Thread(new Runnable() {
  @Override
  public void run() {
    List<Transaction> transactions = db.transactionDao().getAllTransactions();

    // sorted by newest first, reverse so we have a proper timeline
    Collections.reverse(transactions);

    // generate unique timetamps
    ArrayList<Long> timestamps = new ArrayList<>();

    for (int i = 0; i < transactions.size(); i++) {
      Transaction transaction = transactions.get(i);

      if (!timestamps.contains(transaction.timestamp)) {
        timestamps.add(transaction.timestamp);
      }
    }

    // we just aggregated timestamps, now sum up the balance at each timestamp
    DataPoint[] points = new DataPoint[timestamps.size()];

    for (long timestamp : timestamps) {

      double worthAtTimestamp = 0.0;

      for (int i = 0; i < transactions.size(); i++) {
        Transaction transaction = transactions.get(i);

        if (transaction.timestamp == timestamp) {
          worthAtTimestamp += transaction.buy_price_usd;
        }
      }

      // we have millis as timestamps. divide by 1000 to get seconds
      Log.i("Plotting", "Added plot point at "  + timestamp/1000 + ", worth: " + worthAtTimestamp);
      points[timestamps.indexOf(timestamp)] = new DataPoint(timestamp/1000, worthAtTimestamp);
    }

    LineGraphSeries<DataPoint> series = new LineGraphSeries<>(points);

    series.setDrawBackground(true);
    series.setDrawDataPoints(true);

    graph.addSeries(series);
  }
}).start();

Log:

01-27 14:59:53.672 23675-23717/? I/Plotting: Added plot point at 1512120471, worth: 3.43
01-27 14:59:53.672 23675-23717/? I/Plotting: Added plot point at 1513681418, worth: 3.43
01-27 14:59:53.672 23675-23717/? I/Plotting: Added plot point at 1513681448, worth: 3.43
01-27 14:59:53.672 23675-23717/? I/Plotting: Added plot point at 1513681938, worth: 6.41
01-27 14:59:53.672 23675-23717/? I/Plotting: Added plot point at 1513681945, worth: 6.41
01-27 14:59:53.672 23675-23717/? I/Plotting: Added plot point at 1514075528, worth: 6.41
01-27 14:59:53.672 23675-23717/? I/Plotting: Added plot point at 1515269234, worth: 4.47
01-27 14:59:53.672 23675-23717/? I/Plotting: Added plot point at 1515269643, worth: 6.41
01-27 14:59:53.672 23675-23717/? I/Plotting: Added plot point at 1515269656, worth: 13.41
01-27 14:59:53.672 23675-23717/? I/Plotting: Added plot point at 1515388010, worth: 4.47
01-27 14:59:53.672 23675-23717/? I/Plotting: Added plot point at 1515453946, worth: 4.47
01-27 14:59:53.672 23675-23717/? I/Plotting: Added plot point at 1515502416, worth: 6.41
01-27 14:59:53.672 23675-23717/? I/Plotting: Added plot point at 1515523833, worth: 6.41
01-27 14:59:53.672 23675-23717/? I/Plotting: Added plot point at 1515523833, worth: 6.41
01-27 14:59:53.672 23675-23717/? I/Plotting: Added plot point at 1515523834, worth: 6.41
01-27 14:59:53.672 23675-23717/? I/Plotting: Added plot point at 1516023042, worth: 12.82

Layout:

[...]

<com.jjoe64.graphview.GraphView
  android:id="@+id/graph"
  android:layout_width="match_parent"
  android:layout_height="100dip" />

[...]

Screenshot: https://image.ibb.co/i9j5ob/device_2018_01_27_150237.png

I can see some blue line at the left end of the graph which doesn't correspond to the data I've put in.

Any ideas what I'm doing wrong?

[Yvtq8K3n]

It's working for me:

Take this example code as base:

            // generate unique timetamps
            long[] timestamps = new long[]{100000000L, 155269656L, 156023040L, 400000003L, 600000000L};
            double worthAtTimestamp = 3.43;
            double worthAtTimestamp2 = 9.23;
            // we just aggregated timestamps, now sum up the balance at each timestamp
            DataPoint[] points = new DataPoint[timestamps.length];
            int index=0;
            for (long timestamp:timestamps) {
                //Adding abit of variation in the chart(if position mod of 5 write 3.43 else 9.23)
                points[index++] = new DataPoint(timestamp, 
                           (timestamp%5==0)?worthAtTimestamp:worthAtTimestamp2);
            }

            LineGraphSeries<DataPoint> series = new LineGraphSeries<>(points);

            series.setDrawBackground(true);
            series.setDrawDataPoints(true);

            graphQuality.addSeries(series);
            graphQuality.getGridLabelRenderer().setHorizontalLabelsAngle(90);
            graphQuality.getGridLabelRenderer().setNumHorizontalLabels(4);
            graphQuality.getViewport().setMaxX(timestamps[timestamps.length-1]);
            graphQuality.getViewport().setMaxY(10);
            graphQuality.getViewport().setMinX(0);

How its look like:

(I would close this but i dont think i can)