Creates a simple model for making a looming animation by setting start and end screen diameters and total duration
diameter_model(
start_diameter = 3,
end_diameter = 50,
duration = 3,
frame_rate = 60,
expansion = "constant_speed"
)numeric. Diameter (cm) you want the animation to start at.
numeric. Diameter (cm) you want the animation to end at. If you want the animation to fill the screen, this should be slightly larger than the physical screen size.
numeric. Total duration (s) you want the animation to be.
numeric. Frames per second (Hz) you want the resulting animation to be played at.
string. constant_speed or constant_diameter.
Sets if the expansion of the simulation is modelled as a constant speed or
constant increase in diameter (see Details).
List object containing the input parameters and a model with the resulting diameter for each frame in the animation.
Creates a simple expansion model for use in
looming_animation, from a start and end diameter, and a total
duration. Expansion of the simulation can be set in two ways. In the
default, constant_speed, the function models the expansion of the
simulated oncoming object as if it were approaching at a constant speed.
Because of visual foreshortening, this results in a simulation that expands
progressively more rapidly as the animation progresses. If =
constant_diameter, the function instead imposes a constant increase in
diameter, i.e. a simulation that expands by the same amount in diameter in
each frame. This simulation represents an oncoming object that is starting
off at high speed, but slowing down as it gets closer to the target.
Inputs should be in cm, duration in seconds (s), and frame rate in
Hz or Frames per Second.
loom_model <- diameter_model(
start_diameter = 2,
end_diameter = 50,
duration = 3,
frame_rate = 60,
expansion = "constant_speed")