void paint()

in web/github_dataviz/lib/timeline.dart [137:221]
75 lines of code
11 McCabe index (conditional complexity)

  void paint(Canvas canvas, Size size) {
    double labelHeight = 20;
    double labelHeightDoubled = labelHeight * 2;

    double mainLineY = size.height / 2;
    canvas.drawLine(
        Offset(0, mainLineY), Offset(size.width, mainLineY), mainLinePaint);

    double currTimeX = size.width * animationValue;
    canvas.drawLine(
        Offset(currTimeX, labelHeightDoubled),
        Offset(currTimeX, size.height - labelHeightDoubled),
        milestoneLinePaint);

    {
      for (int week = 0; week < numWeeks; week++) {
        double lineHeight = size.height / 32;
        bool isYear = false;
        if ((week - 9) % 52 == 0) {
          // Year
          isYear = true;
          lineHeight = size.height / 2;
        } else if ((week - 1) % 4 == 0) {
          // Month
          lineHeight = size.height / 8;
        }

        double currX = (week / numWeeks.toDouble()) * size.width;
        if (lineHeight > 0) {
          double margin = (size.height - lineHeight) / 2;
          double currTimeXDiff = (currTimeX - currX) / size.width;
          if (currTimeXDiff > 0) {
            var mappedValue =
                MathUtils.clampedMap(currTimeXDiff, 0, 0.025, 0, 1);
            var lerpedColor = Color.lerp(Constants.milestoneTimelineColor,
                Constants.timelineLineColor, mappedValue)!;
            mainLinePaint.color = lerpedColor;
          } else {
            mainLinePaint.color = Constants.timelineLineColor;
          }
          canvas.drawLine(Offset(currX, margin),
              Offset(currX, size.height - margin), mainLinePaint);
        }

        if (isYear) {
          var yearLabel = '$yearNumber';
          state.labelPainters[yearLabel]!
              .paint(canvas, Offset(currX, size.height - labelHeight));
          yearNumber++;
        }
      }
    }

    {
      for (int i = 0; i < weekLabels.length; i++) {
        WeekLabel weekLabel = weekLabels[i];
        double currX = (weekLabel.weekNum! / numWeeks.toDouble()) * size.width;
        var timelineXDiff = (currTimeX - currX) / size.width;
        double maxTimelineDiff = 0.08;
        TextPainter textPainter = state.labelPainters[weekLabel.label]!;
        if (timelineXDiff > 0 &&
            timelineXDiff < maxTimelineDiff &&
            animationValue < 1) {
          var mappedValue =
              MathUtils.clampedMap(timelineXDiff, 0, maxTimelineDiff, 0, 1);
          var lerpedColor = Color.lerp(
              Colors.redAccent, Constants.milestoneTimelineColor, mappedValue)!;
          milestoneLinePaint.strokeWidth =
              MathUtils.clampedMap(timelineXDiff, 0, maxTimelineDiff, 6, 1);
          milestoneLinePaint.color = lerpedColor;
        } else {
          milestoneLinePaint.strokeWidth = 1;
          milestoneLinePaint.color = Constants.milestoneTimelineColor;
        }

        double lineHeight = size.height / 2;
        double margin = (size.height - lineHeight) / 2;
        canvas.drawLine(Offset(currX, margin),
            Offset(currX, size.height - margin), milestoneLinePaint);

        textPainter.paint(
            canvas, Offset(currX, size.height - labelHeightDoubled));
      }
    }
  }