StripPolygonSeeder.cpp

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#include <string>
#include <vector>

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

#include "StripPolygonSeeder.h"

namespace Isis {

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


  std::vector<geos::geom::Point *> StripPolygonSeeder::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 strip seeder specific tests to make sure this poly should be seeded
    // (none for now)

    // Starting at the centroid of the xy polygon populate the polygon with
    // staggered points with the requested spacing
    geos::geom::Point *centroid = multiPoly->getCentroid();
    double centerX = centroid->getX();
    double centerY = centroid->getY();
    delete centroid;

    int xStepsToCentroid = (int)((centerX - polyBoundBox->getMinX()) / p_Xspacing + 0.5);
    int yStepsToCentroid = (int)((centerY - polyBoundBox->getMinY()) / p_Yspacing + 0.5);
    double dRealMinX = centerX - (xStepsToCentroid * p_Xspacing);
    double dRealMinY = centerY - (yStepsToCentroid * p_Yspacing);
    double dDeltaXToReal = p_Xspacing * 1.0 / 6.0;
    double dDeltaYToReal = p_Yspacing * 1.0 / 6.0;

    for(double y = dRealMinY; y <= polyBoundBox->getMaxY(); y += p_Yspacing) {
      //printf("Grid Line,%.10f,%.10f,Through,%.10f,%.10f\n",dRealMinX, y, xyBoundBox->getMaxX(), y);
      for(double x = dRealMinX; x <= polyBoundBox->getMaxX(); x += p_Xspacing) {
        geos::geom::Coordinate c(x + dDeltaXToReal, y + dDeltaYToReal);
        geos::geom::Point *p = Isis::globalFactory.createPoint(c);
        if(p->within(multiPoly)) {
          points.push_back(Isis::globalFactory.createPoint(c));
        }

        geos::geom::Coordinate c2(x - dDeltaXToReal, y - dDeltaYToReal);
        p = Isis::globalFactory.createPoint(c2);
        if(p->within(multiPoly)) {
          points.push_back(Isis::globalFactory.createPoint(c2));
        }
      }
    }

    return points;
  }

  void StripPolygonSeeder::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_Xspacing = 0.0;
      if(algo.hasKeyword("XSpacing")) {
        p_Xspacing = (double) algo["XSpacing"];
        if(invalgo.hasKeyword("XSpacing")) {
          invalgo.deleteKeyword("XSpacing");
        }
      }
      else {
        QString msg = "PVL for StripSeeder must contain [XSpacing] in [";
        msg += pvl.fileName() + "]";
        throw IException(IException::User, msg, _FILEINFO_);
      }

      p_Yspacing = 0.0;
      if(algo.hasKeyword("YSpacing")) {
        p_Yspacing = (double) algo["YSpacing"];
        if(invalgo.hasKeyword("YSpacing")) {
          invalgo.deleteKeyword("YSpacing");
        }
      }
      else {
        QString msg = "PVL for StripSeeder must contain [YSpacing] 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_Xspacing <= 0.0) {
      IString msg = "X Spacing must be greater that 0.0 [(" + IString(p_Xspacing) + "]";
      throw IException(IException::User, msg, _FILEINFO_);
    }
    if(p_Yspacing <= 0.0) {
      IString msg = "Y Spacing must be greater that 0.0 [(" + IString(p_Yspacing) + "]";
      throw IException(IException::User, msg, _FILEINFO_);
    }
  }

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

    PvlKeyword name("Name", Algorithm());
    PvlKeyword minThickness("MinimumThickness", toString(MinimumThickness()));
    PvlKeyword minArea("MinimumArea", toString(MinimumArea()));
    PvlKeyword xSpac("XSpacing", toString(p_Xspacing));
    PvlKeyword ySpac("YSpacing", toString(p_Yspacing));

    pluginInfo.addKeyword(name);
    pluginInfo.addKeyword(minThickness);
    pluginInfo.addKeyword(minArea);
    pluginInfo.addKeyword(xSpac);
    pluginInfo.addKeyword(ySpac);

    return pluginInfo;
  }

}; // End of namespace Isis


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