Custom marker gets displayed wrong on the latest value

[jackalcool]

I have a little issue when trying to display the Balloon Marker on the latest chart value. When I tap on other nodes the popup is rendered well, only the latest value gets cut.

This is my custom marker code, taken from your swift example

public class BalloonMarker: MarkerImage
{
  public var color: UIColor?
  public var arrowSize = CGSize(width: 15, height: 11)
  public var font: UIFont?
  public var textColor: UIColor?
  public var insets = UIEdgeInsets()
  public var minimumSize = CGSize()
  public var currency: String!
  
  private var labelns: NSString?
  private var _labelSize: CGSize = CGSize()
  private var _paragraphStyle: NSMutableParagraphStyle?
  private var _drawAttributes = [String : AnyObject]()
  
  public init(color: UIColor, font: UIFont, textColor: UIColor, insets: UIEdgeInsets)
  {
    super.init()
    
    self.color = color
    self.font = font
    self.textColor = textColor
    self.insets = insets
    
    _paragraphStyle = NSParagraphStyle.defaultParagraphStyle().mutableCopy() as? NSMutableParagraphStyle
    _paragraphStyle?.alignment = .Center
  }
  
  public override func offsetForDrawingAtPos(point: CGPoint) -> CGPoint
  {
    let size = self.size
    var point = point
    point.y -= size.height
    return super.offsetForDrawingAtPos(point)
  }
  
  public override func draw(context context: CGContext, point: CGPoint)
  {
    if (labelns == nil)
    {
      return
    }
    
    let offset = self.offsetForDrawingAtPos(point)
    let size = self.size
    
    var rect = CGRect(
      origin: CGPoint(
        x: point.x + offset.x,
        y: point.y + offset.y),
      size: size)
    rect.origin.x -= size.width / 2.0
    rect.origin.y -= size.height
    
    let rounding = (rect.size.height - arrowSize.height) / 2
    let bubbleFrame = CGRect(x: rect.origin.x, y: rect.origin.y+1, width: rect.width, height: rect.height - arrowSize.height)
    let bubblePath = UIBezierPath(roundedRect: bubbleFrame, byRoundingCorners: UIRectCorner.AllCorners, cornerRadii: CGSize(width: rounding, height: rounding))
    
    color!.setFill()
    bubblePath.fill()
    
    CGContextSaveGState(context)
    
    CGContextSetFillColorWithColor(context, (color?.CGColor)!)
    CGContextBeginPath(context)

    
    CGContextMoveToPoint(context,
                         rect.origin.x + (rect.size.width + arrowSize.width) / 2.0,
                         rect.origin.y + rect.size.height - arrowSize.height)
    CGContextAddLineToPoint(context,
                            rect.origin.x + (rect.size.width + arrowSize.width) / 2.0,
                            rect.origin.y + rect.size.height - arrowSize.height)
    CGContextAddLineToPoint(context,
                            rect.origin.x + rect.size.width / 2.0,
                            rect.origin.y + rect.size.height)
    CGContextAddLineToPoint(context,
                            rect.origin.x + (rect.size.width - arrowSize.width) / 2.0,
                            rect.origin.y + rect.size.height - arrowSize.height)
    
    CGContextFillPath(context)
    
    rect.origin.y += self.insets.top
    rect.size.height -= self.insets.top + self.insets.bottom
    
    UIGraphicsPushContext(context)
    
    labelns?.drawInRect(rect, withAttributes: _drawAttributes)
    
    UIGraphicsPopContext()
    
    CGContextRestoreGState(context)
  }
  
  public override func refreshContent(entry entry: ChartDataEntry, highlight: Highlight) {
    
    let numberFormatter = NSNumberFormatter()
    numberFormatter.locale = NSLocale.currentLocale()
    numberFormatter.numberStyle = .DecimalStyle
    numberFormatter.maximumFractionDigits = 2
    numberFormatter.minimumFractionDigits = 2
    
    let price = currency + numberFormatter.stringFromNumber(NSNumber(float: Float(entry.y)))!
    
    setLabel(price)
  }
  
  public func setLabel(label: String) {
    labelns = label as NSString
    
    _drawAttributes.removeAll()
    _drawAttributes[NSFontAttributeName] = self.font
    _drawAttributes[NSParagraphStyleAttributeName] = _paragraphStyle
    _drawAttributes[NSForegroundColorAttributeName] = self.textColor
    
    _labelSize = labelns?.sizeWithAttributes(_drawAttributes) ?? CGSizeZero
    
    var size = CGSize()
    size.width = _labelSize.width + self.insets.left + self.insets.right
    size.height = _labelSize.height + self.insets.top + self.insets.bottom
    size.width = max(minimumSize.width, size.width)
    size.height = max(minimumSize.height, size.height)
    self.size = size
  }
}

[liuxuan30]

It sees like the marker is trying to avoid being cut? I see this in ChartsDemo lien chart too. check out super.offsetForDrawing()

By using #1741, it might display better.