osrm-backend/Plugins/BaseDescriptor.h

/*
    open source routing machine
    Copyright (C) Dennis Luxen, 2010

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU AFFERO General Public License as published by
the Free Software Foundation; either version 3 of the License, or
any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU Affero General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
or see http://www.gnu.org/licenses/agpl.txt.
 */

#ifndef BASE_DESCRIPTOR_H_
#define BASE_DESCRIPTOR_H_

#include <cassert>
#include <cmath>
#include <cstdio>
#include <string>
#include <vector>

#include "../typedefs.h"
#include "../DataStructures/ExtractorStructs.h"
#include "../DataStructures/HashTable.h"
#include "../DataStructures/PolylineCompressor.h"
#include "../Util/StringUtil.h"

#include "RawRouteData.h"

static double areaThresholds[19] = { 5000, 5000, 5000, 5000, 5000, 2500, 2000, 1500, 800, 400, 250, 150, 100, 75, 25, 20, 10, 5, 0 };

/* Get angle of line segment (A,C)->(C,B), atan2 magic, formerly cosine theorem*/
static double GetAngleBetweenTwoEdges(const _Coordinate& A, const _Coordinate& C, const _Coordinate& B) {
    int v1x = A.lon - C.lon;
    int v1y = A.lat - C.lat;
    int v2x = B.lon - C.lon;
    int v2y = B.lat - C.lat;

    double angle = (atan2((double)v2y,v2x) - atan2((double)v1y,v1x) )*180/M_PI;
    while(angle < 0)
        angle += 360;

    return angle;
}

struct RouteSummary {
    std::string lengthString;
    std::string durationString;
    std::string startName;
    std::string destName;
    RouteSummary() : lengthString("0"), durationString("0"), startName("unknown street"), destName("unknown street") {}
    void BuildDurationAndLengthStrings(double distance, unsigned time) {
        //compute distance/duration for route summary
        std::ostringstream s;
        s << 10*(round(distance/10.));
        lengthString = s.str();
        int travelTime = 60*(time/60.) + 1;
        s.str("");
        s << travelTime;
        durationString = s.str();
    }
};

struct DirectionOfInstruction {
    std::string direction;
    std::string shortDirection;
};

struct DescriptorState {
    _Coordinate currentCoordinate, nextCoordinate, previousCoordinate, tmpCoord, startOfSegmentCoordinate;
    std::string routeGeometryString;
    std::string routeInstructionString;
    unsigned lastNameID, currentNameID, geometryCounter, startIndexOfGeometry;
    double entireDistance, distanceOfInstruction, durationOfInstruction;

    DescriptorState() : lastNameID(0), currentNameID(0), geometryCounter(0), startIndexOfGeometry(0), entireDistance(0.), distanceOfInstruction(0.), durationOfInstruction(0.) {};
    double GetAngleBetweenCoordinates() const {
        return GetAngleBetweenTwoEdges(previousCoordinate, currentCoordinate, nextCoordinate);
    }
    bool CurrentAndPreviousNameIDsEqual() const {
        return lastNameID == currentNameID;
    }
    void SetStartOfSegment() {
        startOfSegmentCoordinate = nextCoordinate;
        entireDistance += distanceOfInstruction;
        lastNameID = currentNameID;
        distanceOfInstruction = 0;
        startIndexOfGeometry = geometryCounter-1;
    }
    void PrintCoordinates() {
#ifdef DEBUG
        std::cout << "prev: " << previousCoordinate << ", curr: " << currentCoordinate << ", next: " << nextCoordinate << std::endl;
#endif
    }
};

struct _DescriptorConfig {
    _DescriptorConfig() : instructions(true), geometry(true), encodeGeometry(false), z(18) {}
    bool instructions;
    bool geometry;
    bool encodeGeometry;
    unsigned short z;

    PolylineCompressor pc;
};

template<class SearchEngineT>
class BaseDescriptor {
public:
    BaseDescriptor() { }
    //Maybe someone can explain the pure virtual destructor thing to me (dennis)
    virtual ~BaseDescriptor() { }
    virtual void Run(http::Reply & reply, RawRouteData &rawRoute, PhantomNodes &phantomNodes, SearchEngineT &sEngine, unsigned distance) = 0;
    virtual void SetConfig(const _DescriptorConfig & config) = 0;
};

static inline void getDirectionOfInstruction(double angle, DirectionOfInstruction & dirInst) {
    if(angle >= 23 && angle < 67) {
        dirInst.direction = "southeast";
        dirInst.shortDirection = "SE";
        return;
    }
    if(angle >= 67 && angle < 113) {
        dirInst.direction = "south";
        dirInst.shortDirection = "S";
        return;
    }
    if(angle >= 113 && angle < 158) {
        dirInst.direction = "southwest";
        dirInst.shortDirection = "SW";
        return;
    }
    if(angle >= 158 && angle < 202) {
        dirInst.direction = "west";
        dirInst.shortDirection = "W";
        return;
    }
    if(angle >= 202 && angle < 248) {
        dirInst.direction = "northwest";
        dirInst.shortDirection = "NW";
        return;
    }
    if(angle >= 248 && angle < 292) {
        dirInst.direction = "north";
        dirInst.shortDirection = "N";
        return;
    }
    if(angle >= 292 && angle < 336) {
        dirInst.direction = "northeast";
        dirInst.shortDirection = "NE";
        return;
    }
    dirInst.direction = "East";
    dirInst.shortDirection = "E";
    return;
}

static inline void getTurnDirectionOfInstruction(double angle, std::string & output) {
    if(angle >= 23 && angle < 67) {
        output = "Turn sharp right";
//        cout << "angle " << angle << "-> " << output << endl;
        return;
    }
    if (angle >= 67 && angle < 113) {
        output = "Turn right";
//        cout << "angle " << angle << "-> " << output << endl;
        return;
    }
    if (angle >= 113 && angle < 158) {
        output = "Bear right";
//        cout << "angle " << angle << "-> " << output << endl;
        return;
    }

    if (angle >= 158 && angle < 202) {
        output = "Continue";
//        cout << "angle " << angle << "-> " << output << endl;
        return;
    }
    if (angle >= 202 && angle < 248) {
        output = "Bear left";
//        cout << "angle " << angle << "-> " << output << endl;
        return;
    }
    if (angle >= 248 && angle < 292) {
        output = "Turn left";
//        cout << "angle " << angle << "-> " << output << endl;
        return;
    }
    if (angle >= 292 && angle < 336) {
        output = "Turn sharp left";
//        cout << "angle " << angle << "-> " << output << endl;
        return;
    }
    output = "U-Turn";
//    cout << "angle " << angle << "-> " << output << endl;
}

#endif /* BASE_DESCRIPTOR_H_ */