arrowPositionPercent property
The position of the arrow along the edge as a percentage (0.0 to 1.0).
For top/bottom arrows: 0.0 places the arrow at the left edge, 0.5 at center, 1.0 at right edge. For left/right arrows: 0.0 places the arrow at the top edge, 0.5 at center, 1.0 at bottom edge. Defaults to 0.5 (center position).
Implementation
final double arrowPositionPercent;