使用核心图的气泡图、散点图、烛台图

Question

我的ipad项目需要有8种图形和图表，包括3个变量的气泡图、散点图、烛台图等。快速搜索给我的结果是目前ios.But中最常用的图形和图表解决方案，当我进入页面时，没有看到任何类型的气泡图或散点图的实现。我的问题是。

• 是否可以在coreplot中绘制3个可变气泡图、散点图或烛台图?还是我需要使用核心图形绘制整个图形？

提前感谢

Answer 1

核心图支持散点图和烛台图。您可以通过对散点图使用自定义的绘图符号并更改绘图符号的大小来表示第三个变量，从而轻松地制作气泡图。

Answer 2

如果您只想实现散点图，这里的代码是在Swid3.1Xcode 8.3.2中运行良好的代码

func setChart(dataPoints:[String] , value1 :[Double] , value2:[Double])
 {
    var dataEntries1:[ChartDataEntry] = []

    for i in 0..<dataPoints.count {
        let dataEntry = ChartDataEntry(x:value1[i] , y : Double(i))
        dataEntries1.append(dataEntry)
    }

    var dataEntries2:[ChartDataEntry] = []

    for i in 0..<dataPoints.count {
        let dataEntry = ChartDataEntry(x:value2[i] , y : Double(i))
        dataEntries2.append(dataEntry)
    }

    let dataSet1 = ScatterChartDataSet(values: dataEntries1, label: "Value1" )
    dataSet1 .setColor(UIColor.blue)
    let dataSet2 = ScatterChartDataSet(values: dataEntries2 ,label: "Value2")
    dataSet2.setColor(UIColor.green)

    var dataSets = [ScatterChartDataSet]()
    dataSets.append(dataSet1)
    dataSets.append(dataSet2)

    let barChartData = ScatterChartData(dataSets: dataSets)

    scatterChart.xAxis.labelPosition = .bottom
    scatterChart.rightAxis.enabled=false
    scatterChart.legend.enabled=false
    scatterChart.descriptionText = ""
    scatterChart.data = barChartData

}

Answer 3

下面是在应用程序中添加气泡图的代码

此代码适用于SWIFT3.1和Xcode 8.3.2

func setBubbleChart(dataPoints: [Int], values: [Int], amounts: [Int]) {

        var dataEntries: [BubbleChartDataEntry] = []

        for i in 0..<dataPoints.count {
            let dataEntry = BubbleChartDataEntry(x: Double(dataPoints[i]), y: Double(values[i]), size: 15.0)
            dataEntries.append(dataEntry)
        }

        let format = NumberFormatter()
        format.generatesDecimalNumbers = false
        format.zeroSymbol = ""
        _ = DefaultValueFormatter(formatter: format)

        let chartDataSet = BubbleChartDataSet(values: dataEntries, label: "Prashant")
        let chartData = BubbleChartData(dataSet: chartDataSet)



        chartDataSet.colors.append(setColor(value:30))

        bubbleChartView.doubleTapToZoomEnabled = true
        bubbleChartView.scaleXEnabled = true
        bubbleChartView.scaleYEnabled = true
        bubbleChartView.highlightPerTapEnabled = true
        bubbleChartView.highlightPerDragEnabled = true

        let firstLegend = LegendEntry.init(label: "Below 50", form: .default, formSize: CGFloat.nan, formLineWidth: CGFloat.nan, formLineDashPhase: CGFloat.nan, formLineDashLengths: nil, formColor: UIColor.black)
        let secondLegend = LegendEntry.init(label: "Between 50 and 75", form: .default, formSize: CGFloat.nan, formLineWidth: CGFloat.nan, formLineDashPhase: CGFloat.nan, formLineDashLengths: nil, formColor: UIColor.black)
        let thirdLegend = LegendEntry.init(label: "Over 75", form: .default, formSize: CGFloat.nan, formLineWidth: CGFloat.nan, formLineDashPhase: CGFloat.nan, formLineDashLengths: nil, formColor: UIColor.black)

        bubbleChartView.chartDescription = nil
        bubbleChartView.legend.entries = [firstLegend, secondLegend, thirdLegend]
        bubbleChartView.data = chartData
        bubbleChartView.drawBordersEnabled = true
        bubbleChartView.animate(xAxisDuration: 5.0, yAxisDuration: 5.0)

        let xAxis: XAxis = bubbleChartView.xAxis
        xAxis.drawAxisLineEnabled = true
        xAxis.drawGridLinesEnabled = true
        xAxis.drawLabelsEnabled = true
        xAxis.axisMinimum = 0
        xAxis.axisMaximum = 10

        let leftAxis: YAxis = bubbleChartView.leftAxis
        leftAxis.drawAxisLineEnabled = true
        leftAxis.drawGridLinesEnabled = true
        leftAxis.setLabelCount(2, force: true)
        leftAxis.axisMinimum = 0
        leftAxis.axisMaximum = 120

        let rightAxis: YAxis = bubbleChartView.rightAxis
        rightAxis.drawAxisLineEnabled = false
        rightAxis.drawGridLinesEnabled = true
        rightAxis.drawLabelsEnabled = false
    }