Not seeing colors in PieChart

[bernhardwaidacher]

I'm not seeing any colors in my PieChart. This is the code:

  func showPieChart(){
    pieChartView.isHidden = false
    tableView.isHidden = true
    searchbar.isHidden = true

    let transactions = manager.transactions.value
    let grouped = transactions.categorise({$0.category})
    var entries:[PieChartDataEntry] = []

    grouped.forEach{c, ts in
      var sum = 0.0
      ts.forEach{t in
        sum += t.expense ? Double(t.value * -1) : Double(t.value)
      }
      let entry =  PieChartDataEntry(value: sum, label: c.name)
      entries.append(entry)
    }

    entries.sort(by: {$0.0.value > $0.1.value})
    entries = Array(entries.prefix(10))

    let data = PieChartData()
    let ds1 = PieChartDataSet(values: entries, label: "")

    ds1.colors = ChartColorTemplates.material()

    data.addDataSet(ds1)

    let paragraphStyle: NSMutableParagraphStyle = NSParagraphStyle.default.mutableCopy() as! NSMutableParagraphStyle
    paragraphStyle.lineBreakMode = .byTruncatingTail
    paragraphStyle.alignment = .center
    let centerText: NSMutableAttributedString = NSMutableAttributedString(string: "Top 10 spending categories".localizedCapitalized)

    self.pieChartView.centerAttributedText = centerText

    self.pieChartView.data = data
    self.pieChartView.holeColor = UIColor.clear

    self.pieChartView.animate(xAxisDuration: 0.0, yAxisDuration: 1.0)
  }

Attached is a screenshot.

[guidove]

Same problem here. Did you find a solution by any chance? Tried several things, but no effect. The colors are registered with the dataset though (see legend). Makes me think that it might have something to do with the pie slices drawing area or something. I'll keep on digging, but if you found a solution or workaround could you let me know? Thanks & regards, Guido

[bernhardwaidacher]

No I haven't found a solution. I also think it's some size issue. I'll have a look at this later and let you know

[guidove]

Found it. (For me at least.)

I was passing negative values to the dataset, which makes them not draw (see PieChartRenderer.swift line 151).

Also I found (for me, legend drawn at the right of the pie) that if you set yourPieChart.legend.drawInside = false then the pie chart is really really small. Had to play with legend.maxSizePercent and legend.xOffset and graph.extraLeft/Right/Top/BottomOffset to get it looking OK.

[bernhardwaidacher]

Oh! Guess that will be the same for me, as I pass negative values too! Thank you

[ghost]

As someone who has also run into this issue, I'd love it if either:

• There is a clear error message or exception telling you that your negative value was not drawn
• Or Charts simply takes the absolute value of the negative number.