更改Coreplot Graph的刻度标签

时间:2016-04-14 05:00:44

标签: ios swift swift2 core-plot

我正在使用coreplot表示我的mac应用程序&它的工作正常。我需要沿着轴显示custom labels以获得如下标记:

我有一张功率值与时间的关系图:Power values -> Y-Axis& Time -> X-Axis

I want to draw graph for Time seconds values but show fixed intervals ticks of minutes along x-axis for which i figured that i should use custom labels but its not happening for me.

自定义标签的代码是:

  let graph = CPTXYGraph()

  plots[0].identifier = PlotType.target.rawValue
  plots[1].identifier = PlotType.user.rawValue

  for plot in plots {
     plot.dataSource = self
     plot.delegate = self
     graph.addPlot(plot)
  }

  if let plotArea = graph.plotAreaFrame {
     plotArea.borderLineStyle = nil
     plotArea.paddingLeft = 25.0
     plotArea.paddingBottom = 20.0
     plotArea.paddingRight = 10.0
     plotArea.paddingTop = 20.0
  }

  guard let axisSet = graph.axisSet else { return }

  let xAxis = axisSet.axes?[0]
  var xLabels = [CPTAxisLabel]()
  var xLocations = [NSNumber]()

  let doubleSecs = Double(activity.durationSeconds)
  let labels = [0.0, doubleSecs * 0.25, doubleSecs * 0.50, doubleSecs * 0.75, doubleSecs]
  for label in labels {
     let xLabel = CPTAxisLabel(text: "\(label/60)", textStyle: axisTextStyle)
     xLabel.tickLocation = NSNumber(double: label)
     xLocations.append(NSNumber(double: label))
     xLabels.append(xLabel)
  }
  xAxis?.labelingPolicy = CPTAxisLabelingPolicy.LocationsProvided
  xAxis?.labelFormatter = axisFormatter
  xAxis?.axisLabels = Set(xLabels)
  xAxis?.majorTickLocations = Set(xLocations)

  chartView.hostedGraph = graph

使用上面的代码,它是绘制图形&沿着x轴,它将时间分成4个相等的部分。显示标签,一切都很好。

  

I want to show labels along x-axis as minutes and remaining drawing is ok.

     

我试过这个:let xLabel = CPTAxisLabel(text: "\(label/60)", textStyle: axisTextStyle()),但标签没有改变没有效果。

     

还尝试更改tickLocation,如:xLabel.tickLocation = NSNumber(double: label/60)无效

     

更改majorTickLocations之类的:   xLocations.append(NSNumber(double: label/60))它表现得很奇怪   所有x轴标签都是混乱的。

我尝试按照这个例子:StackOverFlow Post

任何人都可以指导哪些内容出错[请记住我使用的是Swift]?

2 个答案:

答案 0 :(得分:0)

.LocationsProvided标签政策使用labelFormatter自动从刻度位置创建标签。如果您想使用自定义标签,请改用.None标签政策。

答案 1 :(得分:0)

我自己解决了这个问题:

  let xAxis = axisSet.axes?[0]
  xAxis?.majorIntervalLength = activity.durationSeconds / 60 / 4
  xAxis?.labelingPolicy = CPTAxisLabelingPolicy.FixedInterval

现在标签正在按要求发布。