title: GraphView change x and y axis ranges
body: <p>I have a line graph that I add data to each time the user enters a number. The user enters a number 50 times, so I want the x axis to range from 1 to 50 in increments of 1. On the y axis, I want it to range from 2 - 15 (user enters a number between 2 and 15) in increments of 1. I'm really not sure how to do this, this is what I have:</p>
  
  <pre><code>    graph = (GraphView) findViewById(R.id.session_graph);
      series = new LineGraphSeries&lt;DataPoint&gt;(new DataPoint[] {});
      graph.addSeries(series);
  
      graph.getViewport().setMinX(1);
      graph.getViewport().setMaxX(50);
      graph.getViewport().setMinY(2.0);
      graph.getViewport().setMaxY(15.0);
  </code></pre>
  
  <p>However, when I fire up my app, the x and y axis range from 0 - 2 in intervals of 0.5</p>