Sampler.h

/*
 
MIT License
 
Copyright (c) 2017 FMI Open Development / Markus Peura, first.last@fmi.fi
 
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
 
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
 
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
 
*/
/*
Part of Rack development has been done in the BALTRAD projects part-financed
by the European Union (European Regional Development Fund and European
Neighbourhood Partnership Instrument, Baltic Sea Region Programme 2007-2013)
*/
#ifndef DRAIN_SAMPLER_H_
#define DRAIN_SAMPLER_H_
 
 
#include <vector>
#include <iostream>
#include <sstream>
#include <string>
 
#include <drain/FlexibleVariable.h>
 
 
#include "drain/util/BeanLike.h"
#include "drain/util/IosFormat.h"
#include "drain/util/Range.h"
#include "drain/util/ReferenceMap.h"
#include "drain/util/StringMapper.h"
#include "drain/image/Image.h"
 
namespace drain
{
 
namespace image
{
 
 
struct SamplePicker {
 
    inline
    //SamplePicker(ReferenceMap & variableMap) : variableMap(variableMap) {
    SamplePicker(ReferenceMap2<> & variableMap) : variableMap(variableMap) {
        infoMap["width"].link(width  = 0);
        infoMap["height"].link(height = 0);
    }
 
    virtual inline
    ~SamplePicker(){};
 
    void setSize(int w, int h){
        width = w;
        height = h;
    }
 
    virtual
    inline
    void setPosition(int i, int j) const {
        current_i  = i;
        current_j  = j;
        current_j2 = height-1 - j;
    }
 
    // TODO: min/max coord control, like CoordHandler for checking min and max.
    //bool checkPosition()
 
    //virtual
    //void writeHeader(char commentPrefix, std::ostream & ostr) const {};
 
 
    mutable int current_i = 0;
 
    mutable int current_j = 0;
 
    mutable int current_j2 = 0;
 
    int width = 0;
    int height = 0;
 
    FlexVariableMap infoMap;
 
    ReferenceMap2<> & variableMap;
 
};
 
 
class ImageReader : public SamplePicker {
 
public:
 
    inline
    ImageReader(ReferenceMap2<> & ref) : SamplePicker(ref) {//static int dummy;
        variableMap.link("i", current_i = 0);
        variableMap.link("j", current_j = 0);
        variableMap.link("j2", current_j2 = 0);
    }
 
    inline
    bool getValue(const ImageFrame & image, double & value) const {
        //value = image.get<double>(current_i, current_j);
        // if (mode==SCALED ?
        value = image.getScaled(current_i, current_j);
        //value = image.get<double>(current_i, current_j);
        //std::cerr << current_i << ',' << current_j << '\t' << value << '\n';
        return true;
    }
 
 
};
 
 
class Sampler : public BeanLike {
 
public:
 
    Sampler();
 
    inline
    Sampler(const Sampler &sampler) : BeanLike(sampler){
        parameters.copyStruct(sampler.getParameters(), sampler, *this);
    };
 
    // Named conf, to separate ImageMod::parameters (BeanLike)
    //ReferenceMap conf;
 
    int iStep = 10;
    int jStep = 0;
 
    drain::Range<int> iRange = {-1,1};
    drain::Range<int> jRange = {-1,1};
 
    std::string commentPrefix = "#";
 
 
    // was already DEPRECATING...
    bool skipVoid = false ;
    //std::string skipVoid = "false";
    std::string voidComment = "void";
 
    // NEW
    std::string handleVoid = "null"; // "false","skip"
 
 
    mutable
    ReferenceMap2<> variableMap;
 
    char getCommentChar() const;
 
    std::string getFormat(const std::string & formatStr) const;
 
 
 
    template <class D, class P>
    void sample(const std::map<std::string, D> & images, const P & picker, const std::string & formatStr, std::ostream & ostr = std::cout) const { // std::string format copy ok
 
        drain::Logger mout(__FUNCTION__, getName());
 
        if (images.empty()){
            mout.error("no image data (channels) provided: " );
            return;
        }
 
        const bool SKIP_VOID = (handleVoid == "skip") || (skipVoid == true);
 
        const bool MARK_VOID = (handleVoid != "skip");
 
        double voidMarker = NAN;
        if (handleVoid != "null"){
            StringTools::convert(handleVoid, voidMarker);
        }
 
        // Save initial formatting data
 
        //mout.special("fieldWidth: " , fieldWidth , ", fillChar=" , fillChar );
        mout.debug2("variables (initially): " , variableMap.getKeys() );
 
        // Note: supports leading minus sign
        drain::StringMapper formatter("-?[a-zA-Z0-9_]+"); // WAS: "-?[a-zA-Z0-9_]+" with odd "-?"
        // format = drain::StringTools::replace(format, "\\n", "\n");
        // format = drain::StringTools::replace(format, "\\t", "\t");
        std::string format = getFormat(formatStr);
        formatter.parse(format, true); // convert escaped, eg. "\\n" -> "\n"
        formatter.iosFormat.copyFrom(ostr);
        mout.special("iosFormat: " , formatter.iosFormat );
 
        // std::string format = getFormat(formatStr);
 
        // Service: associate file keys with data
        // mout.debug("check minus" );
        std::map<std::string, double> values;
        static const std::string minusStr("-");
        for (typename std::map<std::string, D>::const_iterator it = images.begin(); it != images.end(); ++it){
            const std::string & key = it->first;
            mout.debug2("referencing: " , key , ',' , minusStr , key );
            variableMap.link(key, values[key]=0);
            variableMap.link(minusStr+key, values[minusStr+key]=0);
        }
        mout.debug("variables: " , variableMap );
 
 
 
        const int iStep  = this->iStep;
        const int jStep  = (this->jStep > 0) ? this->jStep : iStep;
 
        const char commentChar = getCommentChar();
        if (commentChar){
 
            // ostr << commentChar << " TEST\n";
            // picker.writeHeader(commentChar, ostr);
            // ostr << commentChar << " size='" << picker.width << 'x' << picker.height << "'\n";
 
            ostr << commentChar << commentChar << " input properties " << '\n';
 
            for (const auto & entry: picker.infoMap){
                ostr << commentChar << ' ' << entry.first << '=';
                //it->second.valueToJSON(ostr);
                Sprinter::toStream(ostr, entry.second, Sprinter::jsonLayout);
                ostr << '\n';
            }
 
            ostr << commentChar << commentChar << " sampling parameters " << '\n';
 
            for (const auto & entry: parameters){
                ostr << commentChar << ' ' << entry.first << '=';
                // it->second.valueToJSON(ostr);
                Sprinter::toStream(ostr, entry.second, Sprinter::jsonLayout);
                ostr << '\n';
            }
            if (!formatStr.empty())
                ostr << commentChar << " format='" << formatStr << "'\n"; // formatStr instead of format, to save double slash \\n \\t
            else
                ostr << commentChar << " format='" << format << "'\n";
 
            ostr << commentChar << commentChar << " resulting geometry " << '\n';
            const int iN = picker.width/iStep;
            const int jN = picker.height/jStep;
            ostr << commentChar << " rows=" << iN << "\n";
            ostr << commentChar << " rols=" << jN << "\n";
            ostr << commentChar << " samples=" << (iN*jN) << "\n";
 
 
        }
 
 
        int iStart = this->iRange.min; // this->iStart;
        if (iStart < 0)
            iStart = iStep/2;
 
        int jStart = this->jRange.min; //jStart;
        if (jStart < 0)
            jStart = jStep/2;
 
        int iEnd   = this->iRange.max; // iEnd;
        if (iEnd < iStart)
            iEnd = picker.width-1;
 
        int jEnd   = this->jRange.max; // jEnd;
        if (jEnd < jStart)
            jEnd = picker.height-1;
 
 
        // Main loop: traverse image area with (i,j)
        // SamplePicker has set variableMap references (ie. geographical coords j2=(height-1-j) ).
        double x;
        bool dataOk;
        for (int j = jStart; j<=jEnd; j+=jStep){
            for (int i = iStart; i<=iEnd; i+=iStep){
 
                picker.setPosition(i, j);
 
                // SLOW, but works... // TODO speedup with iterator
                dataOk = true;
                for (typename std::map<std::string, D>::const_iterator it = images.begin(); it != images.end(); ++it){
                    const std::string & quantity = it->first;
                    const D & data = it->second;
                    if (!picker.getValue(data, x)){
                        dataOk = false;
                        if (MARK_VOID){
                            x = voidMarker;
                        }
                    }
                    //else if (x != 0) std::cerr << x << '\t';
 
                    values[quantity] = x;
                    values[minusStr+quantity] = -x;
                }
 
                if (dataOk || !SKIP_VOID){
                //if (dataOk || (skipVoid==0)){
                    //formatter.toStream(ostr, variableMap, true);
                    formatter.toStream(ostr, variableMap, -1); // leaves ${variable} ?
                    if  ((!dataOk) && (commentChar))
                        ostr << ' ' << commentChar <<  voidComment;
                    ostr << '\n';
                }
            }
            // formatter.expand(map, true);
        }
        mout.debug("last values: " , variableMap );
        //mout.warn("formatter " , formatter );
 
    }
 
 
};
 
 
 
}
}
 
 
#endif /*POINT_H_*/
 
// Drain