Ruckig  0.4.0
Instantaneous Motion Generation
Example 6: Stop Trajectory

C++

#include <iostream>
using namespace ruckig;
int main() {
// Create instances: the ruckig otg as well as input and output parameters
Ruckig<3> otg {0.01};
InputParameter<3> input;
OutputParameter<3> output;
// Set input parameters
input.current_position = {0.0, 0.0, 0.5};
input.current_velocity = {0.0, -2.2, -0.5};
input.current_acceleration = {0.0, 2.5, -0.5};
input.target_position = {-5.0, -2.0, -3.5};
input.target_velocity = {0.0, -0.5, -2.0};
input.target_acceleration = {0.0, 0.0, 0.5};
input.max_velocity = {3.0, 1.0, 3.0};
input.max_acceleration = {3.0, 2.0, 1.0};
input.max_jerk = {4.0, 3.0, 2.0};
// Generate the trajectory within the control loop
std::cout << "t | p1 | p2 | p3" << std::endl;
bool on_stop_trajectory {false};
while (otg.update(input, output) == Result::Working) {
auto& p = output.new_position;
std::cout << output.time << " " << p[0] << " " << p[1] << " " << p[2] << " " << std::endl;
// Activate stop trajectory after 1s
if (output.time >= 1.0 && !on_stop_trajectory) {
std::cout << "Stop immediately." << std::endl;
on_stop_trajectory = true;
// Synchronization is disabled so that each DoF stops as fast as possible independently
input.control_interface = ControlInterface::Velocity;
input.synchronization = Synchronization::None;
input.target_velocity = {0.0, 0.0, 0.0};
input.target_acceleration = {0.0, 0.0, 0.0};
input.max_jerk = {12.0, 10.0, 8.0};
}
output.pass_to_input(input);
}
std::cout << "Stop trajectory duration: " << output.trajectory.get_duration() << " [s]." << std::endl;
}
int main()
Definition: 1_position.cpp:8
Definition: block.hpp:12
@ None
Calculate every DoF independently.
@ Working
The trajectory is calculated normally.
Definition: input_parameter.hpp:16
@ Velocity
Velocity-control: Ignores the current position, target position, and velocity limits.

Python

from copy import copy
from pathlib import Path
from sys import path
# Path to the build directory including a file similar to 'ruckig.cpython-37m-x86_64-linux-gnu'.
build_path = Path(__file__).parent.absolute().parent / 'build'
path.insert(0, str(build_path))
from ruckig import InputParameter, OutputParameter, Result, Ruckig, ControlInterface, Synchronization
if __name__ == '__main__':
# Create instances: the Ruckig OTG as well as input and output parameters
otg = Ruckig(3, 0.01) # DoFs, control cycle
inp = InputParameter(3)
out = OutputParameter(3)
inp.current_position = [0.0, 0.0, 0.5]
inp.current_velocity = [0.0, -2.2, -0.5]
inp.current_acceleration = [0.0, 2.5, -0.5]
inp.target_position = [-5.0, -2.0, -3.5]
inp.target_velocity = [0.0, -0.5, -2.0]
inp.target_acceleration = [0.0, 0.0, 0.5]
inp.max_velocity = [3.0, 1.0, 3.0]
inp.max_acceleration = [3.0, 2.0, 1.0]
inp.max_jerk = [4.0, 3.0, 2.0]
print('\t'.join(['t'] + [str(i) for i in range(otg.degrees_of_freedom)]))
# Generate the trajectory within the control loop
first_output = None
on_stop_trajectory = False
res = Result.Working
while res == Result.Working:
res = otg.update(inp, out)
print('\t'.join([f'{out.time:0.3f}'] + [f'{p:0.3f}' for p in out.new_position]))
# Activate stop trajectory after 1s
if out.time >= 1.0 and not on_stop_trajectory:
print('Stop immediately!')
on_stop_trajectory = True
# Synchronization is disabled so that each DoF stops as fast as possible independently
inp.control_interface = ControlInterface.Velocity
inp.synchronization = Synchronization.No
inp.target_velocity = [0.0, 0.0, 0.0]
inp.target_acceleration = [0.0, 0.0, 0.0]
inp.max_jerk = [12.0, 10.0, 8.0]
out.pass_to_input(inp)
if not first_output:
first_output = copy(out)
print(f'Calculation duration: {first_output.calculation_duration:0.1f} [┬Ás]')
print(f'Trajectory duration: {first_output.trajectory.duration:0.4f} [s]')
std::string join(const Vector &array)
Definition: utils.hpp:11

Output Trajectory