calculateLegendOffsets method

Rect calculateLegendOffsets(Rect offsets)

Implementation

Rect calculateLegendOffsets(Rect offsets) {
  offsets = const Rect.fromLTRB(0.0, 0.0, 0.0, 0.0);
  // setup offsets for legend
  if (legend != null && legend!.enabled && !legend!.drawInside) {
    switch (legend!.orientation) {
      case LegendOrientation.vertical:
        switch (legend!.horizontalAlignment) {
          case LegendHorizontalAlignment.left:
            offsets = Rect.fromLTRB(
                min(
                        legend!.neededWidth,
                        viewPortHandler!.getChartWidth() *
                            legend!.maxSizePercent) +
                    legend!.xOffset,
                0.0,
                0.0,
                0.0);
            break;

          case LegendHorizontalAlignment.right:
            offsets = Rect.fromLTRB(
                0.0,
                0.0,
                min(
                        legend!.neededWidth,
                        viewPortHandler!.getChartWidth() *
                            legend!.maxSizePercent) +
                    legend!.xOffset,
                0.0);
            break;

          case LegendHorizontalAlignment.center:
            switch (legend!.verticalAlignment) {
              case LegendVerticalAlignment.top:
                offsets = Rect.fromLTRB(
                    0.0,
                    min(
                            legend!.neededHeight,
                            viewPortHandler!.getChartHeight() *
                                legend!.maxSizePercent) +
                        legend!.yOffset,
                    0.0,
                    0.0);
                break;

              case LegendVerticalAlignment.bottom:
                offsets = Rect.fromLTRB(
                    0.0,
                    0.0,
                    0.0,
                    min(
                            legend!.neededHeight,
                            viewPortHandler!.getChartHeight() *
                                legend!.maxSizePercent) +
                        legend!.yOffset);
                break;

              default:
                break;
            }
        }

        break;

      case LegendOrientation.horizontal:
        switch (legend!.verticalAlignment) {
          case LegendVerticalAlignment.top:
            offsets = Rect.fromLTRB(
                0.0,
                min(
                        legend!.neededHeight,
                        viewPortHandler!.getChartHeight() *
                            legend!.maxSizePercent) +
                    legend!.yOffset,
                0.0,
                0.0);
            break;

          case LegendVerticalAlignment.bottom:
            offsets = Rect.fromLTRB(
                0.0,
                0.0,
                0.0,
                min(
                        legend!.neededHeight,
                        viewPortHandler!.getChartHeight() *
                            legend!.maxSizePercent) +
                    legend!.yOffset);
            break;

          default:
            break;
        }
        break;
    }
  }
  return offsets;
}