minReferencePositionOffsetFactor property
Min Amplitude factor of the curve. Affects how far the reference point at least be from mid point. Offset factor should be between 0 and 1. Default is Offset(0.4, 0.3), which means dx of Reference point should at least (0.4 * (width/2)) and dy of the Reference point should at least (0.3 * (width/2)) width/2 since the curve starts in center
Implementation
final Offset minReferencePositionOffsetFactor;