PS:Random tree 8
The branches of the random tree are bent with the wind operator, which reduces the horizontal angle by the wind force. To get the current angle, the operator currentangle questions the current matrix and applies inverse tangens. The reduction rotated by 90 degrees because we always draw upside not horizontally. Then wind force is driven by a global inverse parabole, which then is reduced by the currentlinewidth and then modulated by some randomness.