customizeSegment method
Changes the series color, border color, and border width.
Implementation
@override
void customizeSegment(ChartSegment segment) {
final BubbleSegment<T, D> bubbleSegment = segment as BubbleSegment<T, D>;
updateSegmentColor(bubbleSegment, borderColor, borderWidth);
updateSegmentGradient(bubbleSegment,
gradientBounds: bubbleSegment.segmentRect,
gradient: gradient,
borderGradient: borderGradient);
}