title: MPChart BarChart: draw x axis line on zero value
body: <p>I am using MPChart for displaying a Barchart. My values are positive and negative. I want to show xAxis as used in Math of traditional way. Using this code my chart display vertical lines (only zero wanted)</p>
  
  <pre><code>mXAxis = mChart.getXAxis();
  mXAxis.setDrawGridLines(false);
  mXAxis.setEnabled(false);
  
  mYAxis = mChart.getAxisLeft();
  mYAxis.setDrawAxisLine(false);
  mYAxis.setDrawGridLines(true);
  mYAxis.setStartAtZero(false);
  
  mYAxisRight = mChart.getAxisRight();
  mYAxisRight.setEnabled(false);
  mYAxisRight.setDrawGridLines(false);
  </code></pre>
  
  <p>Please, provide some sample for removing all horizontal lines but zero</p>
  
  <p><strong>EDIT:</strong>
  Even when <code>yAxis.setLabelCount(1)</code> (1 because zero value needed to shown) the impl looks like:</p>
  
  <pre><code>public void setLabelCount(int yCount) {
      if(yCount &gt; 25) {
          yCount = 25;
      }
  
      if(yCount &lt; 2) {
          yCount = 2;
      }
  
      this.mLabelCount = yCount;
  }
  </code></pre>
  
  <p>So, is it recommended to override this implementation?</p>