title: Negative values not displayed in line charts using ios-charts using Swift
body: <p>I have negative values in my line chart using ios-charts. Positive values are displayed but negative values are clipped at 0. I have set the left and right axes not to start at 0 but no help.</p>
  
  <pre><code>    LineChart1.leftAxis.startAtZeroEnabled = false
      LineChart1.rightAxis.startAtZeroEnabled = false
  </code></pre>
  
  <p>Any ideas? TIA.</p>
  
  <p>Code snippet below.</p>
  
  <pre><code>    override func viewDidLoad() {
      super.viewDidLoad()
  
      // Do any additional setup after loading the view.
  
      self.navigationController?.navigationBar.translucent = false
  
      self.title = "Line Chart 1"
      LineChart1.bounds = CGRectMake(-20, -20, 275, 250)
      LineChart1.data = getMyData()
      LineChart1.drawBordersEnabled = false
      LineChart1.legend.enabled = false
      LineChart1.leftAxis.startAtZeroEnabled = false
      LineChart1.rightAxis.startAtZeroEnabled = false
      LineChart1.xAxis.setLabelsToSkip(0)
      LineChart1.xAxis.drawGridLinesEnabled = false
      LineChart1.leftAxis.drawGridLinesEnabled = true
      LineChart1.rightAxis.drawLabelsEnabled = false
      LineChart1.animate(xAxisDuration: 0.3)
      LineChart1.animate(yAxisDuration: 0.3)
  
      LineChart1.setNeedsDisplay()
  }
  
  func getMyData() -&gt; LineChartData {
  
      var xVals = ["2008","2009","2010","2011","2012"]
  
      var courses: [ChartDataEntry] = []
      courses.append(ChartDataEntry(value: 3, xIndex: 0))
      courses.append(ChartDataEntry(value: -40, xIndex: 1))
      courses.append(ChartDataEntry(value: 4, xIndex: 2))
      courses.append(ChartDataEntry(value: 4, xIndex: 3))
      courses.append(ChartDataEntry(value: 3, xIndex: 4))
  
      let bcds = LineChartDataSet(yVals: courses, label: "")
      bcds.valueTextColor = UIColor.blackColor()
  
      return LineChartData(xVals: xVals, dataSet: bcds)
  }
  </code></pre>