builder method

Implementation

@override
BasePainter builder(BuildContext context) {
  final data = watchController();
  double lastClose = 0;
  final painter = VolChartPainter(
    paddingTop: widget.paddingTop,
    pointSpace: data.getSpace(),
    scrollX: data.getScrollX(),
    scale: data.getScale(),
    pressOffset: data.getPressOffset(),
    values: data.values,
    showMaLine: widget.showMaLine,
    pointWidth: data.pointWidth,
    upperStyle: widget.upperStyle,
    fairStyle: widget.fairStyle,
    lowerStyle: widget.lowerStyle,
    upperColor: widget.upperColor,
    fairColor: widget.fairColor,
    lowerColor: widget.lowerColor,
    strokeWidth: widget.strokeWidth,
    gridLineWidth: widget.gridLineWidth,
    gridLineColor: widget.gridLineColor,
    gridHorizontalGrids: widget.gridHorizontalGrids,
    gridVerticalGrids: widget.gridVerticalGrids,
    ma10LineColor: widget.ma10LineColor,
    ma5LineColor: widget.ma5LineColor,
    maStrokeWidth: widget.maStrokeWidth,
    crossLineColor: widget.crossLineColor,
    crossLineWidth: widget.crossLineWidth,
    textStyle: widget.textStyle,
    showText: widget.showText,
    transform: (values) {
      return values.map((e) => e.volume).toList();
    },
    transformBarStyle: (item) {
      BarStyle style;
      if (data.isKChart()) {
        if (item.close >= item.open) {
          style = BarStyle.upper;
        } else {
          style = BarStyle.lower;
        }
      } else {
        if (item.close < lastClose) {
          style = BarStyle.lower;
        } else if (item.close > lastClose) {
          style = BarStyle.upper;
        } else {
          style = BarStyle.fair;
        }

        lastClose = item.close;
      }

      return style;
    },
  );
  return painter;
}