onPaint method

  1. @override
void onPaint(
  1. Canvas canvas
)
override

Draws segment in series bounds.

Implementation

@override
void onPaint(Canvas canvas) {
  if (points.isEmpty || points.length != 2) {
    return;
  }

  final Offset? start =
      Offset.lerp(_oldPoints[0], points[0], animationFactor);
  final Offset? end = Offset.lerp(_oldPoints[1], points[1], animationFactor);
  final double controlX1 =
      lerpDouble(_oldStartControlX, startControlX, animationFactor)!;
  final double controlY1 =
      lerpDouble(_oldStartControlY, startControlY, animationFactor)!;
  final double controlX2 =
      lerpDouble(_oldEndControlX, endControlX, animationFactor)!;
  final double controlY2 =
      lerpDouble(_oldEndControlY, endControlY, animationFactor)!;

  if (start != null && end != null) {
    final Path path = Path()
      ..moveTo(start.dx, start.dy)
      ..cubicTo(controlX1, controlY1, controlX2, controlY2, end.dx, end.dy);
    final Paint paint = getStrokePaint();
    if (paint.color != Colors.transparent && paint.strokeWidth > 0) {
      drawDashes(canvas, series.dashArray, paint, path: path);
    }
  }
}