customizeSegment method
Changes the series color and border width.
Implementation
@override
void customizeSegment(ChartSegment segment) {
  updateSegmentColor(segment, color, borderWidth, isLineType: true);
  updateSegmentGradient(segment);
}Changes the series color and border width.
@override
void customizeSegment(ChartSegment segment) {
  updateSegmentColor(segment, color, borderWidth, isLineType: true);
  updateSegmentGradient(segment);
}