danielgindi/Charts how to get xLabel position - ios

Question

I was able to get the position of the x Label from xAxisRenderer. But I failed to import this into my project. I'm trying to get this position and create a custom x-axis. How can I store a value in an external module and use it in an internal module?
#objc open func drawLabels(context: CGContext, pos: CGFloat, anchor: CGPoint)
{
guard let transformer = self.transformer else { return }
let paraStyle = ParagraphStyle.default.mutableCopy() as! MutableParagraphStyle
paraStyle.alignment = .center
let labelAttrs: [NSAttributedString.Key : Any] = [.font: axis.labelFont,
.foregroundColor: axis.labelTextColor,
.paragraphStyle: paraStyle]
let labelRotationAngleRadians = axis.labelRotationAngle.DEG2RAD
let isCenteringEnabled = axis.isCenterAxisLabelsEnabled
let valueToPixelMatrix = transformer.valueToPixelMatrix
var position = CGPoint.zero
var labelMaxSize = CGSize.zero
if axis.isWordWrapEnabled
{
labelMaxSize.width = axis.wordWrapWidthPercent * valueToPixelMatrix.a
}
let entries = axis.entries
for i in entries.indices
{
let px = isCenteringEnabled ? CGFloat(axis.centeredEntries[i]) : CGFloat(entries[i])
position = CGPoint(x: px, y: 0)
.applying(valueToPixelMatrix)
guard viewPortHandler.isInBoundsX(position.x) else { continue }
let label = axis.valueFormatter?.stringForValue(axis.entries[i], axis: axis) ?? ""
let labelns = label as NSString
if axis.isAvoidFirstLastClippingEnabled
{
// avoid clipping of the last
if i == axis.entryCount - 1 && axis.entryCount > 1
{
let width = labelns.boundingRect(with: labelMaxSize, options: .usesLineFragmentOrigin, attributes: labelAttrs, context: nil).size.width
if width > viewPortHandler.offsetRight * 2.0,
position.x + width > viewPortHandler.chartWidth
{
position.x -= width / 2.0
}
}
else if i == 0
{ // avoid clipping of the first
let width = labelns.boundingRect(with: labelMaxSize, options: .usesLineFragmentOrigin, attributes: labelAttrs, context: nil).size.width
position.x += width / 2.0
}
}
print(position.x)
drawLabel(context: context,
formattedLabel: label,
x: position.x,
y: pos,
attributes: labelAttrs,
constrainedTo: labelMaxSize,
anchor: anchor,
angleRadians: labelRotationAngleRadians)
}
}
I tried to get the position value by creating an open class called XAxisPosition, but the value is initialized to 0 in the process of importing it into my project module. I have access to it, but how do I get the values ​​fully into my project?

Answer 1

public protocol XAxisRendererDelegate
{
#objc optional func renderer(_ renderer: XAxisRenderer,
labelPostion: CGPoint)
}
#objc open weak var delegate: XAxisRendererDelegate?
I added this XAxisRenderer.
and add this in drawLabels.
let px = isCenteringEnabled ? CGFloat(axis.centeredEntries[i]) :
CGFloat(entries[i])
position = CGPoint(x: px, y: 0)
.applying(valueToPixelMatrix)
delegate?.renderer?(self, labelPostion: position)
and use this
chartView.xAxisRenderer.delegate = self