d property
final
        The y coordinate of the second control point.
The line through the point (1, 1) and the second control point is tangent to the curve at the point (1, 1).
Implementation
final double d
        The y coordinate of the second control point.
The line through the point (1, 1) and the second control point is tangent to the curve at the point (1, 1).
final double d