Question

我正在使用ios-charts库生成多线图。（danielgindi /图表）。我正在为从Core Data检索的x-axsis创建一个数组，如果没有x周的值，我附加了一个0。

我有一个示例数组（对于x值）：

[[0.0,0.0,5.6,3.0,6.0,5.4,2.1,0.0,0.0,1.3,4.1,0.0]，[5.2,0.0,3.2,7.0,8.9,0.0,5.0,0.0,4.6,0.0 ，0.0,0.0]，[3.6,1.5,3.6,0.0,0.0,3.5,0.0,4.6,5.6,2.8,8.4,0.0]]

和y：

[一月，二月，三月，四月，五月，六月，七月，八月，九月，十月，十一月，十二月]

我有以下代码在折线图中显示这3行：

func setChart(xValues: [NSDate], valuesLineChart: [[Double]]) {
    chartView.descriptionText = ""
    chartView.noDataText = "You need to provide data for the chart."

    var dataSets : [LineChartDataSet] = [LineChartDataSet]()
    var yVals1 : [ChartDataEntry] = [ChartDataEntry]()
    for i in 0..<xValues.count {
        yVals1.append(ChartDataEntry(value: valuesLineChart[0][i], xIndex: i))
    }

    var yVals2 : [ChartDataEntry] = [ChartDataEntry]()
    for i in 0..<xValues.count {
        yVals2.append(ChartDataEntry(value: valuesLineChart[1][i], xIndex: i))
    }

    var yVals3 : [ChartDataEntry] = [ChartDataEntry]()
    for i in 0..<xValues.count {
        yVals3.append(ChartDataEntry(value: valuesLineChart[2][i], xIndex: i))
    }

    let set1 = LineChartDataSet(yVals: yVals1, label: nil)
    let set2 = LineChartDataSet(yVals: yVals2, label: nil)
    let set3 = LineChartDataSet(yVals: yVals3, label: nil)

    set1.fillColor = UniversalStatic.data.colourArrayForGraph[0]
    set2.fillColor = UniversalStatic.data.colourArrayForGraph[1]
    set3.fillColor = UniversalStatic.data.colourArrayForGraph[2]

    dataSets.append(set1)
    dataSets.append(set2)
    dataSets.append(set3)

    set1.setColor(UniversalStatic.data.colourArrayForGraph[0])
    set2.setColor(UniversalStatic.data.colourArrayForGraph[1])
    set3.setColor(UniversalStatic.data.colourArrayForGraph[2])

    set1.lineWidth = 2
    set2.lineWidth = 2
    set3.lineWidth = 2

    set1.setCircleColor(UniversalStatic.data.colourArrayForGraph[0])
    set2.setCircleColor(UniversalStatic.data.colourArrayForGraph[1])
    set3.setCircleColor(UniversalStatic.data.colourArrayForGraph[2])

    set1.drawCircleHoleEnabled = false
    set2.drawCircleHoleEnabled = false
    set3.drawCircleHoleEnabled = false

    set1.circleRadius = 5.0
    set2.circleRadius = 5.0
    set3.circleRadius = 5.0

    let data: CombinedChartData = CombinedChartData(xVals: xValues)
    data.lineData = LineChartData(xVals: xValues, dataSets: dataSets)

    chartView.data = data

}

如何避免绘制0值？

感谢您的帮助

Answer 1

您是否希望完全跳过0.0值？您可以在将它们附加到阵列之前进行检查。

也许你可以这样做：

  var yVals1 : [ChartDataEntry] = [ChartDataEntry]()
  for i in 0..<xValues.count {
      if valuesLineChart[0][i] != 0.0 {
          yVals1.append(ChartDataEntry(value: valuesLineChart[0][i], xIndex: i))
      }
  }

与其他for循环类似

Answer 2

您可以做到的唯一方法是覆盖默认行为。

实际上相当简单，创建LineChartRenderer的子类并覆盖drawLinear（行），drawValues（值呈现）和drawExtras（圆圈）。

只需复制超类方法（LineChartRenderer）的实现，并添加所需条件以跳过零值。

然后将自定义渲染器指定给图表视图。

另一个可能无法覆盖渲染器的选项是为每个值提供颜色。然后你可以为零值设置清晰的颜色。

多线图，不想绘制0值。斯威夫特2

2 个答案: