updateSegmentColor method

void updateSegmentColor(ChartSegment segment, Color? borderColor, double borderWidth, { Color? fillColor, bool isLineType = false, })

Implementation

void updateSegmentColor(
  ChartSegment segment,
  Color? borderColor,
  double borderWidth, {
  Color? fillColor,
  bool isLineType = false,
}) {
  Color color;
  Color strokeColor;
  double strokeWidth;
  final Color effColor = effectiveColor(segment.currentSegmentIndex);
  if (segment.isEmpty) {
    color =
        (isLineType && emptyPointSettings.mode == EmptyPointMode.zero)
            ? fillColor ?? effColor
            : emptyPointSettings.color;
    // The purpose of isLineType is to set a default border color for
    // both line-type series and financial-type series.
    strokeColor = isLineType ? color : emptyPointSettings.borderColor;
    strokeWidth = emptyPointSettings.borderWidth;
  } else {
    color = fillColor ?? effColor;
    strokeColor = borderColor ?? effColor;
    strokeWidth = borderWidth;
  }

  if (opacity != 1.0) {
    if (color != Colors.transparent) {
      color = color.withValues(alpha: opacity);
    }
    if (strokeColor != Colors.transparent) {
      strokeColor = strokeColor.withValues(alpha: opacity);
    }
  }

  if (effectiveSelectionBehavior != null &&
      effectiveSelectionBehavior!.enable &&
      parent != null &&
      parent!.selectionController.hasSelection) {
    if (isSelected || segment.isSelected) {
      final double opacity = effectiveSelectionBehavior!.selectedOpacity;
      color = effectiveSelectionBehavior!.selectedColor ?? color;
      if (color != Colors.transparent) {
        color = color.withValues(alpha: opacity);
      }
      strokeColor =
          effectiveSelectionBehavior!.selectedBorderColor ?? strokeColor;
      if (strokeColor != Colors.transparent) {
        strokeColor = strokeColor.withValues(alpha: opacity);
      }
      strokeWidth =
          effectiveSelectionBehavior!.selectedBorderWidth ?? strokeWidth;
    } else {
      final double opacity = effectiveSelectionBehavior!.unselectedOpacity;
      color = effectiveSelectionBehavior!.unselectedColor ?? color;
      if (color != Colors.transparent) {
        color = color.withValues(alpha: opacity);
      }
      strokeColor =
          effectiveSelectionBehavior!.unselectedBorderColor ?? strokeColor;
      if (strokeColor != Colors.transparent) {
        strokeColor = strokeColor.withValues(alpha: opacity);
      }
      strokeWidth =
          effectiveSelectionBehavior!.unselectedBorderWidth ?? strokeWidth;
    }
  }

  segment.fillPaint.color = color;
  segment.strokePaint
    ..color = strokeColor
    ..strokeWidth = strokeWidth;
}