source: trunk/src/Cubes/drawMomentCutout.cc

// -----------------------------------------------------------------------
// drawMomentCutout.cc: Drawing a 0th-moment map and related functions.
// -----------------------------------------------------------------------
// Copyright (C) 2006, Matthew Whiting, ATNF
//
// This program is free software; you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by the
// Free Software Foundation; either version 2 of the License, or (at your
// option) any later version.
//
// Duchamp 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 General Public License
// along with Duchamp; if not, write to the Free Software Foundation,
// Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA
//
// Correspondence concerning Duchamp may be directed to:
//    Internet email: Matthew.Whiting [at] atnf.csiro.au
//    Postal address: Dr. Matthew Whiting
//                    Australia Telescope National Facility, CSIRO
//                    PO Box 76
//                    Epping NSW 1710
//                    AUSTRALIA
// -----------------------------------------------------------------------
#include <iostream>
#include <sstream>
#include <cpgplot.h>
#include <math.h>
#include <duchamp/duchamp.hh>
#include <duchamp/param.hh>
#include <duchamp/fitsHeader.hh>
#include <duchamp/Cubes/cubes.hh>
#include <duchamp/Cubes/cubeUtils.hh>
#include <duchamp/Utils/utils.hh>
#include <duchamp/Utils/mycpgplot.hh>
#include <duchamp/PixelMap/Voxel.hh>
#include <duchamp/PixelMap/Object3D.hh>
#include <vector>

const int MIN_WIDTH=20;
using namespace mycpgplot;
using namespace PixelInfo;

namespace duchamp
{

  void Cube::drawMomentCutout(Detection &object)
  {
    ///  @details
    ///   A routine to draw the 0th moment for the given detection
    ///    using the flux given by the pixel array in the Cube.
    ///   The 0th moment is constructed by adding the flux of each
    ///    pixel within the full extent of the object (this may be more
    ///    pixels than were actually detected in the object)
    ///   A tick mark is also drawn to indicate angular scale (but only
    ///    if the WCS for the Cube is valid).
    /// \param object The Detection to be drawn.

    if(!cpgtest()){
      DUCHAMPERROR("Draw Cutout","There is no PGPlot device open.");
    }
    else{

      size_t size = (object.getXmax()-object.getXmin()+1);
      if(size<size_t(object.getYmax()-object.getYmin()+1)) 
        size = object.getYmax()-object.getYmin()+1;
      size += MIN_WIDTH;

      long xmin = (object.getXmax()+object.getXmin())/2 - size/2 + 1;
      long xmax = (object.getXmax()+object.getXmin())/2 + size/2;
      long ymin = (object.getYmax()+object.getYmin())/2 - size/2 + 1;
      long ymax = (object.getYmax()+object.getYmin())/2 + size/2;
      long zmin = object.getZmin();
      long zmax = object.getZmax();

      std::vector<bool> isGood(size*size,true);
      for(int z=zmin; z<=zmax; z++){
        for(int x=xmin; x<=xmax; x++){
          for(int y=ymin; y<=ymax; y++){
            isGood[(y-ymin) * size + (x-xmin)] = 
              ((x>=0)&&(x<int(this->axisDim[0])))    // if inside the boundaries
              && ((y>=0)&&(y<int(this->axisDim[1]))) // if inside the boundaries
              && !this->isBlank(x,y,z);         // if not blank
          }
        }
      }

      float *image = new float[size*size];
      for(size_t i=0;i<size*size;i++) image[i]=0.;

      size_t imPos,cubePos;
      for(int z=zmin; z<=zmax; z++){
        for(int x=xmin; x<=xmax; x++){
          for(int y=ymin; y<=ymax; y++){

            imPos = (y-ymin) * size + (x-xmin);
            cubePos = z*this->axisDim[0]*this->axisDim[1] + 
              y*this->axisDim[0] + x;

            if(isGood[imPos]) image[imPos] += this->array[cubePos];

          }
        }
      }

      for(size_t i=0;i<size*size;i++){
        // if there is some signal on this pixel, normalise by the velocity width
        if(isGood[i]) image[i] /= float(zmax-zmin+1); 
      }

      // now work out the greyscale display limits, 
      //   excluding blank pixels where necessary.
      float z1,z2;
      int ct=0;
      while(!isGood[ct]) ct++; // move to first non-blank pixel
      z1 = z2 = image[ct];
      for(size_t i=1;i<size*size;i++){
        if(isGood[i]){
          if(image[i]<z1) z1=image[i];
          if(image[i]>z2) z2=image[i];
        }
      }

      // adjust the values of the blank and extra-image pixels
      for(size_t i=0;i<size*size;i++)
        if(!isGood[i]) image[i] = z1 - 1.;


      float tr[6] = {xmin-1,1.,0.,ymin-1,0.,1.};

      cpgswin(xmin-0.5,xmax-0.5,ymin-0.5,ymax-0.5);
      //     cpggray(image, size, size, 1, size, 1, size, z1, z2, tr);
      cpggray(image, size, size, 1, size, 1, size, z2, z1, tr);
      cpgbox("bc",0,0,"bc",0,0);

      delete [] image;

      int ci;
      cpgqci(&ci);

      // Draw the border of the BLANK region, if there is one...
      drawBlankEdges(this->array,this->axisDim[0],this->axisDim[1],this->par);

      // Draw the border of cube's pixels
      this->drawFieldEdge();

      // Draw the fitted ellipse
      cpgsci(RED);
      float scale=this->head.getShapeScale();
      cpgellipse(object.getXcentre(), object.getYcentre(), 
                 object.getMajorAxis()/this->head.getAvPixScale()/2./scale, object.getMinorAxis()/this->head.getAvPixScale()/2./scale, 
                 90.+object.getPositionAngle());

      // Draw the beam
      if(this->head.beam().isDefined()){
          setDarkGreen();
          cpgsci(DARKGREEN);
          cpgellipse(xmax-0.5-this->head.beam().maj(), ymin-0.5+this->head.beam().maj(),
                     this->head.beam().maj()/2., this->head.beam().min()/2., this->head.beam().pa()+90.);
      }

      // Draw the borders around the object
      cpgsci(DUCHAMP_OBJECT_OUTLINE_COLOUR);
      cpgsfs(OUTLINE);
      if(this->par.drawBorders()) 
        object.drawBorders(xmin,ymin);
      else 
        cpgrect(object.getXmin()-xmin+0.5,object.getXmax()-xmin+1.5,
                object.getYmin()-ymin+0.5,object.getYmax()-ymin+1.5);
      /*
        To get the borders localised correctly, we need to subtract (xmin-1) 
        from the X values. We then subtract 0.5 for the left hand border 
        (to place it on the pixel border), and add 0.5 for the right hand 
        border. Similarly for y.
      */

      if(this->head.isWCS()){
        // Now draw a tick mark to indicate size -- 15 arcmin in length
        //     this->drawScale(xmin+2.,ymin+2.,object.getZcentre(),0.25);
        this->drawScale(xmin+2.,ymin+2.,object.getZcentre());
      }

      cpgsci(ci);


    }

  }

  void Cube::drawScale(float xstart, float ystart, float channel)
  {
    ///  @details
    ///   A routine to draw a scale bar on a (pre-existing) PGPlot image.
    ///   It uses an iterative technique to move from the given start position 
    ///    (xstart,ystart) along the positive x-direction so that the length is
    ///    within 1% of the scaleLength (length in degrees), calculated 
    ///    according to the pixel scale of the cube.
    ///  \param xstart X-coordinate of the start position (left-hand edge
    ///  of tick mark typically).
    ///  \param ystart Y-coordinate of the start position
    ///  \param channel Which channel to base WCS calculations on: needed
    ///  as the positions could theoretically change with channel.

    if(!cpgtest()){
      DUCHAMPERROR("Draw Cutout","There is no PGPlot device open.");
    }
    else{

      if(this->head.isWCS()){  // can only do this if the WCS is good!

        enum ANGLE {ARCSEC, ARCMIN, DEGREE};
        const std::string symbol[3] = {"\"", "'", mycpgplot::degrees };
        const float angleScale[3] = {3600., 60., 1.};
        //  degree, arcmin, arcsec symbols
    
        const int numLengths = 17;
        const double lengths[numLengths] = 
          {0.001/3600., 0.005/3600., 0.01/3600., 0.05/3600., 
           0.1/3600., 0.5/3600., 
           1./3600., 5./3600., 15./3600., 30./3600.,
           1./60., 5./60., 15./60., 30./60.,
           1., 5., 15.};
        const ANGLE angleType[numLengths] = 
          {ARCSEC, ARCSEC, ARCSEC, ARCSEC,
           ARCSEC, ARCSEC, ARCSEC, ARCSEC,
           ARCSEC, ARCSEC,
           ARCMIN, ARCMIN, ARCMIN, ARCMIN,
           DEGREE, DEGREE, DEGREE};
        const float desiredRatio = 0.2;

        // first, work out what is the optimum length of the scale bar,
        //   based on the pixel scale and size of the image.
        float pixscale = this->head.getAvPixScale();
        double *fraction = new double[numLengths];
        int best=0;
        float x1,x2,y1,y2;
        cpgqwin(&x1,&x2,&y1,&y2);
        for(int i=0;i<numLengths;i++){
          fraction[i] = (lengths[i]/pixscale) / (x2-x1);
          if(i==0) best=0;
          else if(fabs(fraction[i] - desiredRatio) < 
                  fabs(fraction[best] - desiredRatio)) best=i;
        }
        delete [] fraction;

        // Now work out actual pixel locations for the ends of the scale bar
        double *pix1   = new double[3];
        double *pix2   = new double[3];
        double *world1 = new double[3];
        double *world2 = new double[3];
        pix1[0] = pix2[0] = xstart;
        pix1[1] = pix2[1] = ystart;
        pix1[2] = pix2[2] = channel;
        this->head.pixToWCS(pix1,world1);

        double angSep=0.;
        double error;
        double step=1.; // this is in pixels
        double scaleLength = lengths[best];  // this is in degrees
        pix2[0] = pix1[0] + scaleLength/(2.*pixscale);
        do{
          this->head.pixToWCS(pix2,world2);
          angSep = angularSeparation(world1[0],world1[1],world2[0],world2[1]);
          error = (angSep-scaleLength)/scaleLength;
          if(error<0) error = 0 - error;
          if(angSep>scaleLength){
            pix2[0] -= step;
            step /= 2.;
          }
          pix2[0] += step;
        }while(error>0.05); // look for 1% change

        float tickpt1 = pix1[0];
        float tickpt2 = pix2[0];
        float tickpt3 = ystart;
        int colour;
        cpgqci(&colour);
        cpgsci(DUCHAMP_TICKMARK_COLOUR);
        int thickness;
        cpgqlw(&thickness);
        cpgslw(3);
        cpgerrx(1,&tickpt1,&tickpt2,&tickpt3,2.);
        cpgslw(thickness);

        std::stringstream text;
        text << scaleLength * angleScale[angleType[best]] 
             << symbol[angleType[best]];
        float size,xch,ych;
        cpgqch(&size);
        cpgsch(0.4);
        cpgqcs(4,&xch,&ych); // get the character size in world coords
        cpgptxt((tickpt1+tickpt2)/2., ystart+ych, 0, 0.5, text.str().c_str());
        cpgsch(size);
        cpgsci(colour);

        delete [] pix1;
        delete [] pix2;
        delete [] world1;
        delete [] world2;

      }
    }

  }
  
  void Cube::drawFieldEdge()
  {
    /// @details
    /// Draw a border around the spatial edge of the data. Lines are
    /// drawn in yellow at 0 and the values of xdim & ydim.  There must
    /// be a PGPLOT window open, else an error message is returned.

    if(!cpgtest()){
      DUCHAMPERROR("Draw Cutout","There is no PGPlot device open.");
    }
    else{
      int ci;
      cpgqci(&ci);
      cpgsci(DUCHAMP_CUBE_EDGE_COLOUR);
  
      cpgmove(-0.5,-0.5);
      cpgdraw(-0.5,this->axisDim[1]-0.5);
      cpgdraw(this->axisDim[0]-0.5,this->axisDim[1]-0.5);
      cpgdraw(this->axisDim[0]-0.5,-0.5);
      cpgdraw(-0.5,-0.5);

      cpgsci(ci);
    }
  }

}