ompl/base/src/StateSampler.cpp
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00034 
00035 /* Author: Ioan Sucan */
00036 
00037 #include "ompl/base/StateSampler.h"
00038 #include "ompl/base/StateSpace.h"
00039 
00040 void ompl::base::CompoundStateSampler::addSampler(const StateSamplerPtr &sampler, double weightImportance)
00041 {
00042     samplers_.push_back(sampler);
00043     weightImportance_.push_back(weightImportance);
00044     samplerCount_ = samplers_.size();
00045 }
00046 
00047 void ompl::base::CompoundStateSampler::sampleUniform(State *state)
00048 {
00049     State **comps = state->as<CompoundState>()->components;
00050     for (unsigned int i = 0 ; i < samplerCount_ ; ++i)
00051         samplers_[i]->sampleUniform(comps[i]);
00052 }
00053 
00054 void ompl::base::CompoundStateSampler::sampleUniformNear(State *state, const State *near, const double distance)
00055 {
00056     State **comps = state->as<CompoundState>()->components;
00057     State **nearComps = near->as<CompoundState>()->components;
00058     for (unsigned int i = 0 ; i < samplerCount_ ; ++i)
00059         if (weightImportance_[i] > std::numeric_limits<double>::epsilon())
00060             samplers_[i]->sampleUniformNear(comps[i], nearComps[i], distance * weightImportance_[i]);
00061         else
00062             samplers_[i]->sampleUniform(comps[i]);
00063 
00064 }
00065 
00066 void ompl::base::CompoundStateSampler::sampleGaussian(State *state, const State *mean, const double stdDev)
00067 {
00068     State **comps = state->as<CompoundState>()->components;
00069     State **meanComps = mean->as<CompoundState>()->components;
00070     for (unsigned int i = 0 ; i < samplerCount_ ; ++i)
00071         samplers_[i]->sampleGaussian(comps[i], meanComps[i], stdDev * weightImportance_[i]);
00072 }
00073 
00074 ompl::base::SubspaceStateSampler::SubspaceStateSampler(const StateSpace *space, const StateSpace *subspace, double weight) : StateSampler(space), subspace_(subspace), weight_(weight)
00075 {
00076     work_ = subspace_->allocState();
00077     work2_ = subspace_->allocState();
00078     subspaceSampler_ = subspace_->allocStateSampler();
00079     space_->getCommonSubspaces(subspace_, subspaces_);
00080     if (subspaces_.empty())
00081         OMPL_WARN("Subspace state sampler did not find any common subspaces. Sampling will have no effect.");
00082 }
00083 
00084 ompl::base::SubspaceStateSampler::~SubspaceStateSampler()
00085 {
00086     subspace_->freeState(work_);
00087     subspace_->freeState(work2_);
00088 }
00089 
00090 void ompl::base::SubspaceStateSampler::sampleUniform(State *state)
00091 {
00092     subspaceSampler_->sampleUniform(work_);
00093     copyStateData(space_, state, subspace_, work_, subspaces_);
00094 }
00095 
00096 void ompl::base::SubspaceStateSampler::sampleUniformNear(State *state, const State *near, const double distance)
00097 {
00098     copyStateData(subspace_, work2_, space_, near);
00099     subspaceSampler_->sampleUniformNear(work_, work2_, distance * weight_);
00100     copyStateData(space_, state, subspace_, work_, subspaces_);
00101 }
00102 
00103 void ompl::base::SubspaceStateSampler::sampleGaussian(State *state, const State *mean, const double stdDev)
00104 {
00105     copyStateData(subspace_, work2_, space_, mean);
00106     subspaceSampler_->sampleGaussian(work_, work2_, stdDev * weight_);
00107     copyStateData(space_, state, subspace_, work_, subspaces_);
00108 }
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