This force adjusts the velocity of particles based on a supplied vector field. The vector field can either be specified using x and y velocities, or angle and magnitude. Velocity adjustments are calculated based on a bilinear interpolation.
The following parameters defines the training of the force and can be passed
along a call to wield()
x : A matrix giving the velocity in the x direction at each grid point
y : A matrix giving the velocity in the y direction at each grid point
angle : A matrix giving the direction of the velocity at each grid point.
Will only be considered if x and y are missing.
vel : A single numeric or a matrix of the same dimensions as angle
giving the magnitude of velocity at each grid point.
xlim : The coordinate span of the vector field in the x direction.
ylim : The coordinate span of the vector field in the y direction.
Other forces:
center_force,
collision_force,
link_force,
manybody_force,
map_force,
mean_force,
random_force,
reset_force,
trap_force,
x_force,
y_force