LimitPolygonSeeder.cpp

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#include <string>
#include <vector>
#include <cmath>
#include <iomanip>

#include <geos/util/TopologyException.h>

#include "IException.h"
#include "LimitPolygonSeeder.h"
#include "PolygonTools.h"
#include "Pvl.h"
#include "PvlGroup.h"

namespace Isis {

  LimitPolygonSeeder::LimitPolygonSeeder(Pvl &pvl) : PolygonSeeder(pvl) {
    Parse(pvl);
  };


  std::vector<geos::geom::Point *> LimitPolygonSeeder::Seed(const geos::geom::MultiPolygon *multiPoly) {

    // Storage for the points to be returned
    std::vector<geos::geom::Point *> points;

    // Create some things we will need shortly
    const geos::geom::Envelope *polyBoundBox = multiPoly->getEnvelopeInternal();

    // Call the parents standardTests member
    QString msg = StandardTests(multiPoly, polyBoundBox);
    if(!msg.isEmpty()) {
      return points;
    }

    // Do limit seeder specific tests to make sure this poly should be seeded
    // (none for now)

    int xSteps = 0;
    int ySteps = 0;

    // Test if X is major axis
    if(fabs(polyBoundBox->getMaxX() - polyBoundBox->getMinX()) > fabs((polyBoundBox->getMaxY() - polyBoundBox->getMinY()))) {
      xSteps = p_majorAxisPts;
      ySteps = p_minorAxisPts;
    }
    else {
      xSteps = p_minorAxisPts;
      ySteps = p_majorAxisPts;
    }

    double xSpacing = (polyBoundBox->getMaxX() - polyBoundBox->getMinX()) / (xSteps);
    double ySpacing = (polyBoundBox->getMaxY() - polyBoundBox->getMinY()) / (ySteps);

    double realMinX = polyBoundBox->getMinX() + xSpacing / 2;
    double realMinY = polyBoundBox->getMinY() + ySpacing / 2;
    double maxY = polyBoundBox->getMaxY();
    double maxX = polyBoundBox->getMaxX();

    for(double y = realMinY; y < maxY; y += ySpacing) {
      for(double x = realMinX; x < maxX; x += xSpacing) {
        geos::geom::Geometry *gridSquarePolygon = GetMultiPolygon(x - xSpacing / 2.0, y - ySpacing / 2,
            x + xSpacing / 2.0, y + ySpacing / 2, *multiPoly);

        geos::geom::Point *centroid = gridSquarePolygon->getCentroid();

        delete gridSquarePolygon;
        if(centroid == NULL) continue;

        double gridCenterX = centroid->getX();
        double gridCenterY = centroid->getY();
        delete centroid;

        geos::geom::Coordinate c(gridCenterX, gridCenterY);
        points.push_back(Isis::globalFactory.createPoint(c));
      }
    }

    return points;
  }

  geos::geom::Geometry *LimitPolygonSeeder::GetMultiPolygon(double dMinX, double dMinY,
      double dMaxX, double dMaxY,
      const geos::geom::MultiPolygon &orig) {
    geos::geom::CoordinateSequence *points = new geos::geom::CoordinateArraySequence();

    points->add(geos::geom::Coordinate(dMinX, dMinY));
    points->add(geos::geom::Coordinate(dMaxX, dMinY));
    points->add(geos::geom::Coordinate(dMaxX, dMaxY));
    points->add(geos::geom::Coordinate(dMinX, dMaxY));
    points->add(geos::geom::Coordinate(dMinX, dMinY));

    geos::geom::Polygon *poly = Isis::globalFactory.createPolygon(Isis::globalFactory.createLinearRing(points), NULL);
    geos::geom::Geometry *overlap = poly->intersection(&orig);

    return overlap;
  }

  void LimitPolygonSeeder::Parse(Pvl &pvl) {
    // Call the parents Parse method
    PolygonSeeder::Parse(pvl);

    // Pull parameters specific to this algorithm out
    try {
      // Get info from Algorithm group
      PvlGroup &algo = pvl.findGroup("PolygonSeederAlgorithm", Pvl::Traverse);
      PvlGroup &invalgo = invalidInput->findGroup("PolygonSeederAlgorithm",
                          Pvl::Traverse);

      // Set the spacing
      p_majorAxisPts = 0;
      if(algo.hasKeyword("MajorAxisPoints")) {
        p_majorAxisPts = (int) algo["MajorAxisPoints"];
        if(invalgo.hasKeyword("MajorAxisPoints")) {
          invalgo.deleteKeyword("MajorAxisPoints");
        }
      }
      else {
        QString msg = "PVL for LimitPolygonSeeder must contain [MajorAxisPoints] in [";
        msg += pvl.fileName() + "]";
        throw IException(IException::User, msg, _FILEINFO_);
      }

      p_minorAxisPts = 0;
      if(algo.hasKeyword("MinorAxisPoints")) {
        p_minorAxisPts = (int) algo["MinorAxisPoints"];
        if(invalgo.hasKeyword("MinorAxisPoints")) {
          invalgo.deleteKeyword("MinorAxisPoints");
        }
      }
      else {
        QString msg = "PVL for LimitPolygonSeeder must contain [MinorAxisPoints] in [";
        msg += pvl.fileName() + "]";
        throw IException(IException::User, msg, _FILEINFO_);
      }
    }
    catch(IException &e) {
      QString msg = "Improper format for PolygonSeeder PVL [" + pvl.fileName() + "]";
      throw IException(IException::User, msg, _FILEINFO_);
    }

    if(p_majorAxisPts < 1.0) {
      IString msg = "Major axis points must be greater that 0.0 [(" + IString(p_majorAxisPts) + "]";
      throw IException(IException::User, msg, _FILEINFO_);
    }

    if(p_minorAxisPts <= 0.0) {
      IString msg = "Minor axis points must be greater that 0.0 [(" + IString(p_minorAxisPts) + "]";
      throw IException(IException::User, msg, _FILEINFO_);
    }
  }

  PvlGroup LimitPolygonSeeder::PluginParameters(QString grpName) {
    PvlGroup pluginInfo(grpName);

    PvlKeyword name("Name", Algorithm());
    PvlKeyword minThickness("MinimumThickness", toString(MinimumThickness()));
    PvlKeyword minArea("MinimumArea", toString(MinimumArea()));
    PvlKeyword majAxis("MajorAxisPoints", toString(p_majorAxisPts));
    PvlKeyword minAxis("MinorAxisPoints", toString(p_minorAxisPts));

    pluginInfo.addKeyword(name);
    pluginInfo.addKeyword(minThickness);
    pluginInfo.addKeyword(minArea);
    pluginInfo.addKeyword(majAxis);
    pluginInfo.addKeyword(minAxis);

    return pluginInfo;
  }

}; // End of namespace Isis


extern "C" Isis::PolygonSeeder *LimitPolygonSeederPlugin(Isis::Pvl &pvl) {
  return new Isis::LimitPolygonSeeder(pvl);
}