.. _program_listing_file_src_LouLib_Odometry_ThreeSensorOdom.cpp:

Program Listing for File ThreeSensorOdom.cpp
============================================

|exhale_lsh| :ref:`Return to documentation for file <file_src_LouLib_Odometry_ThreeSensorOdom.cpp>` (``src/LouLib/Odometry/ThreeSensorOdom.cpp``)

.. |exhale_lsh| unicode:: U+021B0 .. UPWARDS ARROW WITH TIP LEFTWARDS

.. code-block:: cpp

   
   #include "ThreeSensorOdom.hpp"
   
   namespace LouLib {
       namespace Odometry {
           ThreeSensorOdom::ThreeSensorOdom(AbstractOdomSensor &leftSensor, AbstractOdomSensor &rightSensor,
                                            const Units::Length &trackWidth, AbstractOdomSensor &backSensor,
                                            const Units::Length &backDist) : leftSensor(leftSensor),
                                                                             rightSensor(rightSensor),
                                                                             trackWidth(trackWidth),
                                                                             backSensor(backSensor), backDist(backDist) {
               lastLeft = leftSensor.getPosition();
               lastRight = rightSensor.getPosition();
               lastBack = backSensor.getPosition();
           }
   
           void ThreeSensorOdom::setPose(Math::Pose2D newPose) {
               robotPose = newPose;
               lastLeft = leftSensor.getPosition();
               lastRight = rightSensor.getPosition();
               lastBack = backSensor.getPosition();
           }
   
           void ThreeSensorOdom::update() {
               Units::Length deltaLeft = leftSensor.getPosition() - lastLeft;
               Units::Length deltaRight = rightSensor.getPosition() - lastRight;
               Units::Length deltaBack = backSensor.getPosition() - lastBack;
   
               lastLeft = leftSensor.getPosition();
               lastRight = rightSensor.getPosition();
               lastBack = backSensor.getPosition();
   
               double deltaX = ((deltaLeft+deltaRight)/2.0).to(Units::INCH);
               double deltaTheta = ((deltaRight-deltaLeft)/trackWidth).to(Units::number);
   
               double deltaY = (deltaBack - (deltaTheta * backDist)).to(Units::INCH);
   
               Math::Vector deltaPoseVector({deltaX, deltaY, deltaTheta});
   
               Math::Matrix PEMatrix({{}});
               if(deltaTheta > Math::EPS){
                   PEMatrix = Math::Matrix({{std::sin(deltaTheta)/deltaTheta, (std::cos(deltaTheta)-1)/deltaTheta, 0},
                                            {(1-std::cos(deltaTheta))/deltaTheta, std::sin(deltaTheta)/deltaTheta, 0},
                                            {0, 0, 1}});
               }else{
                   PEMatrix = Math::Matrix({{1, 0, 0},
                                            {0, 1, 0},
                                            {0, 0, 1}});
               }
   
               double theta = robotPose.getTheta().to(Units::RADIAN);
   
               Math::Matrix rotMatrix({{std::cos(theta), -std::sin(theta), 0},
                                       {std::sin(theta), std::cos(theta), 0},
                                       {0, 0, 1}});
   
               Math::Vector realPoseChange = rotMatrix * (PEMatrix * deltaPoseVector);
   
               robotPose.setX(robotPose.getX() + realPoseChange[0] * Units::INCH);
               robotPose.setY(robotPose.getY() + realPoseChange[1] * Units::INCH);
               robotPose.setTheta(robotPose.getTheta() + realPoseChange[2] * Units::RADIAN);
               robotPose.setTheta(Math::constrainAngle(robotPose.getTheta().to(Units::DEGREE)) * Units::DEGREE);
   
           }
   
   
       } // LouLib
   } // Odometry