RigidBodyPlanning.py

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#!/usr/bin/env python

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# Author: Mark Moll

try:
    from ompl import base as ob
    from ompl import geometric as og
except:
    # if the ompl module is not in the PYTHONPATH assume it is installed in a
    # subdirectory of the parent directory called "py-bindings."
    from os.path import basename, abspath, dirname, join
    import sys
    sys.path.insert(0, join(dirname(dirname(abspath(__file__))),'py-bindings'))
    from ompl import base as ob
    from ompl import geometric as og

def isStateValid(spaceInformation, state):
    # Some arbitrary condition on the state (note that thanks to
    # dynamic type checking we can just call getX() and do not need
    # to convert state to an SE2State.)
    return state.getX() < .6

def plan():
    # create an SE2 state space
    space = ob.SE2StateSpace()
    # set lower and upper bounds
    bounds = ob.RealVectorBounds(2)
    bounds.setLow(-1)
    bounds.setHigh(1)
    space.setBounds(bounds)
    # construct an instance of space information from this state space
    si = ob.SpaceInformation(space)
    # set state validity checking for this space
    si.setStateValidityChecker(isStateValid)
    # create a random start state
    start = ob.State(space)
    start.random()
    # create a random goal state
    goal = ob.State(space)
    goal.random()
    # create a problem instance
    pdef = ob.ProblemDefinition(si)
    # set the start and goal states
    pdef.setStartAndGoalStates(start, goal)
    # create a planner for the defined space
    planner = og.RRTConnect(si)
    # set the problem we are trying to solve for the planner
    planner.setProblemDefinition(pdef)
    # perform setup steps for the planner
    planner.setup()
    # print the settings for this space
    print si.settings()
    # print the problem settings
    print pdef
    # attempt to solve the problem within one second of planning time
    solved = planner.solve(1.0)

    if solved:
        # get the goal representation from the problem definition (not the same as the goal state)
        # and inquire about the found path
        path = pdef.getGoal().getSolutionPath()
        print "Found solution:\n", path
    else:
        print "No solution found"


def planWithSimpleSetup():
    # create an SE2 state space
    space = ob.SE2StateSpace()

    # set lower and upper bounds
    bounds = ob.RealVectorBounds(2)
    bounds.setLow(-1)
    bounds.setHigh(1)
    space.setBounds(bounds)

    # create a simple setup object
    ss = og.SimpleSetup(space)
    ss.setStateValidityChecker(isStateValid)

    start = ob.State(space)
    # we can pick a random start state...
    start.random()
    # ... or set specific values
    start().setX(.5)

    goal = ob.State(space)
    # we can pick a random goal state...
    goal.random()
    # ... or set specific values
    goal().setY(-.5)

    ss.setStartAndGoalStates(start, goal)

    # this will automatically choose a default planner with
    # default parameters
    solved = ss.solve(1.0)

    if solved:
        # try to shorten the path
        ss.simplifySolution()
        # print the simplified path
        print ss.getSolutionPath()


if __name__ == "__main__":
    plan()
    print ""
    planWithSimpleSetup()

---

ompl
Author(s): Ioan Sucan/isucan@rice.edu, Mark Moll/mmoll@rice.edu, Lydia Kavraki/kavraki@rice.edu
autogenerated on Fri Jan 11 09:33:20 2013