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x20.cc

//---------------------------------------------------------------------------//
// $Id: x20.cc,v 1.7 2004/06/24 01:19:23 airwin Exp $
//---------------------------------------------------------------------------//
//
//---------------------------------------------------------------------------//
// Copyright (C) 2004  Andrew Ross <andrewr@coriolis.greenend.org.uk>
// Copyright (C) 2004  Alan W. Irwin
//
// This file is part of PLplot.
//
// PLplot is free software; you can redistribute it and/or modify
// it under the terms of the GNU Library General Public License as published by
// the Free Software Foundation; version 2 of the License.
//
// PLplot 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 Library General Public License for more details.
//
// You should have received a copy of the GNU Library General Public License
// along with PLplot; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA
//---------------------------------------------------------------------------//
//
//---------------------------------------------------------------------------//
// Implementation of PLplot example 20 in C++.
//---------------------------------------------------------------------------//

#include "plstream.h"
#include "plevent.h"

#include <fstream>
#include <iostream>
#include <cmath>

#ifdef USE_NAMESPACE
using namespace std;
#endif

class x20 {

public:
  x20(int, char **);
  void save_plot(char *);
  void gray_cmap(int);
  int read_img(char *, PLFLT ***, int *, int *, int *);
  int get_clip(PLFLT *, PLFLT *, PLFLT *, PLFLT *);

private:
  // Class data
  plstream *pls;

  static const int XDIM;
  static const int YDIM;

  static int dbg;
  static int nosombrero;
  static int nointeractive;
  static char *f_name;

  static PLOptionTable options[];

};

const int x20::XDIM = 260;
const int x20::YDIM = 220;
int x20::dbg = 0;
int x20::nosombrero = 0;
int x20::nointeractive = 0;
char *x20::f_name = NULL;

PLOptionTable x20::options[] = {
{
    "dbg",              /* extra debugging plot */
    NULL,
    NULL,
    &dbg,
    PL_OPT_BOOL,
    "-dbg",
    "Extra debugging plot" },
{
    "nosombrero",             /* Turns on test of xor function */
    NULL,
    NULL,
    &nosombrero,
    PL_OPT_BOOL,
    "-nosombrero",
    "No sombrero plot" },
{
    "nointeractive",                /* Turns on test of xor function */
    NULL,
    NULL,
    &nointeractive,
    PL_OPT_BOOL,
    "-nointeractive",
    "No interactive selection" },
{
    "save",             /* For saving in postscript */
    NULL,
    NULL,
    &f_name,
    PL_OPT_STRING,
    "-save filename",
      "Save sombrero plot in color postscript `filename'" },
{
    NULL,               /* option */
    NULL,               /* handler */
    NULL,               /* client data */
    NULL,               /* address of variable to set */
    0,                        /* mode flag */
    NULL,               /* short syntax */
    NULL }              /* long syntax */
};


x20::x20( int argc, char ** argv ) {
  PLFLT x[XDIM], y[YDIM], **z, **r;
  PLFLT xi, yi, xe, ye;
  int i, j, width, height, num_col;
  PLFLT **img_f;

  /*
    Bugs in plimage():
     -at high magnifications, the left and right edge are ragged, try
        ./x20c -dev xwin -wplt 0.3,0.3,0.6,0.6 -ori 0.5

    Bugs in x20c.c:
     -if the window is resized after a selection is made on "lena", when
      making a new selection the old one will re-appear.
  */

  // plplot initialization

  pls = new plstream();

  // Parse and process command line arguments.
  pls->MergeOpts(options, "x20c options", NULL);
  pls->ParseOpts( &argc, argv, PL_PARSE_FULL );

  // Initialize PLplot.
  pls->init();

  pls->Alloc2dGrid(&z, XDIM, YDIM);

  /* view image border pixels */
  if (dbg) {
    pls->env(1., (PLFLT) XDIM, 1., (PLFLT) YDIM, 1, 1); /* no plot box */

    /* build a one pixel square border, for diagnostics */
    for (i=0; i<XDIM; i++)
      z[i][YDIM-1] = 1.; /* right */
    for (i=0; i<XDIM; i++)
      z[i][0] = 1.; /* left */

    for (i=0; i<YDIM; i++)
      z[0][i] = 1.; /* top */
    for (i=0; i<YDIM; i++)
      z[XDIM-1][i] = 1.; /* botton */

    pls->lab("...around a blue square."," ","A red border should appear...");

    pls->image(z, XDIM, YDIM,
          1., (PLFLT) XDIM, 1., (PLFLT) YDIM, 0., 0.,
          1., (PLFLT) XDIM, 1., (PLFLT) YDIM);

    pls->adv(0);
  }

  /* sombrero-like demo */
  if (!nosombrero) {
    pls->Alloc2dGrid(&r, XDIM, YDIM);
    pls->col0(2); /* draw a yellow plot box, useful for diagnostics! :( */
    pls->env(0., 2.*M_PI, 0, 3.*M_PI, 1, -1);

    for (i=0; i<XDIM; i++)
      x[i] = i*2.*M_PI/(XDIM-1);
    for (i=0; i<YDIM; i++)
      y[i] = i*3.*M_PI/(YDIM-1);

    for (i=0; i<XDIM; i++)
      for (j=0; j<YDIM; j++) {
      r[i][j] = sqrt(x[i]*x[i]+y[j]*y[j])+1e-3;
      z[i][j] = sin(r[i][j]) / (r[i][j]);
      }

    pls->lab("No, an amplitude clipped \"sombrero\"", "", "Saturn?");
    pls->ptex(2., 2., 3., 4., 0., "Transparent image");
    pls->image(z, XDIM, YDIM, 0., 2.*M_PI, 0, 3.*M_PI, 0.05, 1.,
          0., 2.*M_PI, 0, 3.*M_PI);
    pls->Free2dGrid(r, XDIM, YDIM);

    /* save the plot */
    if (f_name)
      save_plot(f_name);

    pls->adv(0);
    }

  pls->Free2dGrid(z, XDIM, YDIM);

  /* read Lena image */
  if (read_img("lena.pgm", &img_f, &width, &height, &num_col)) {
    cout << "No such file - aborting" << endl;
    delete pls;
    exit(1);
  }

  /* set gray colormap */
  gray_cmap(num_col);

  /* display Lena */
  pls->env(1., width, 1., height, 1, -1);

  if (!nointeractive)
    pls->lab("Set and drag Button 1 to (re)set selection, Button 2 to finish."," ","Lena...");
  else
    pls->lab(""," ","Lena...");

  pls->image(img_f, width, height, 1., width, 1., height, 0., 0.,
        1., width, 1., height);

  // selection/expansion demo
  if (!nointeractive) {
    xi = 200.; xe = 330.;
    yi = 280.; ye = 220.;

    if (get_clip(&xi, &xe, &yi, &ye)) { // get selection rectangle
      delete pls;
      exit(0);
    }

    /*
       I'm unable to continue, clearing the plot and advancing to the next
       one, without hiting the enter key, or pressing the button... help!

       Forcing the xwin driver to leave locate mode and destroying the
       xhairs (in GetCursorCmd()) solves some problems, but I still have
       to press the enter key or press Button-2 to go to next plot, even
       if a pladv() is not present!  Using plbop() solves the problem, but
       it shouldn't be needed!
    */

    /* pls->bop(); */

    /*
       spause(0), adv(0), spause(1), also works,
       but the above question remains.
       With this approach, the previous pause state is lost,
       as there is no API call to get its current state.
    */

    pls->spause(0);
    pls->adv(0);

    // display selection only
    pls->image(img_f, width, height, 1., width, 1., height, 0., 0., xi, xe, ye, yi);

    pls->spause(1);
    pls->adv(0);

    // zoom in selection
    pls->env(xi, xe, ye, yi, 1, -1);
    pls->image(img_f, width, height, 1., width, 1., height, 0., 0., xi, xe, ye, yi);
    pls->adv(0);
  }

  pls->Free2dGrid(img_f, width, height);

  delete pls;

}

// read image from file in binary ppm format
int x20::read_img(char *fname, PLFLT ***img_f, int *width, int *height, int *num_col) {
  ifstream ifs(fname,ios::out | ios::binary);
  unsigned char *img;
  char ver[80];
  char c;
  int i, j, w, h;
  PLFLT **imf;

  /* naive grayscale binary ppm reading. If you know how to, improve it */
  if (!ifs.is_open())
    return 1;

  ifs.getline(ver,80);
  //cout << "version: " << ver << endl;

  if (strcmp(ver, "P5")) /* I only understand this! */
    return 1;

  ifs.read(&c,1);
  while(c == '#') {
    ifs.getline(ver, 80); /* comments */
    //cout << ver << endl; 
    ifs.read(&c,1);
  }
  ifs.putback(c);

  ifs >> w >> h >> *num_col;
  //cout << "width=" << w << " height=" << h << " num_col=" << *num_col << endl;

  img = new unsigned char[w*h];
  pls->Alloc2dGrid(&imf, w, h);

  ifs.read((char *)img,w*h);
  ifs.close();

  for (i=0; i<w; i++)
    for (j=0; j<h; j++)
      imf[i][j] = img[(h-1-j)*w+i]; /* flip image up-down */

  delete[] img;

  *width = w;
  *height = h;
  *img_f = imf;
  return 0;
}

// save plot
void x20::save_plot(char *fname) {
  plstream *pls2;

  pls2 = new plstream(); // create a new one

  pls2->sdev("psc"); // new device type. Use a known existing driver
  pls2->sfnam(fname); // file name

  pls2->cpstrm(*pls, 0); // copy old stream parameters to new stream
  pls2->replot(); // do the save

  delete pls2; // close new device

}

//  get selection square interactively
int x20::get_clip(PLFLT *xi, PLFLT *xe, PLFLT *yi, PLFLT *ye) {
  PLGraphicsIn gin;
  PLFLT xxi=*xi, yyi=*yi, xxe=*xe, yye=*ye, t;
  int st, start = 0;

  pls->xormod(1, &st); /* enter xor mode to draw a selection rectangle */

  if (st) { /* driver has xormod capability, continue */
    while(1) {
      PLFLT sx[5], sy[5];

      pls->xormod(0, &st);
      pls->GetCursor(&gin);
      pls->xormod(1, &st);

      if (gin.button == 1) {
      xxi = gin.wX; yyi = gin.wY;
      if (start)
        pls->line(5, sx, sy); /* clear previous rectangle */

      start = 0;

      sx[0] = xxi; sy[0] = yyi;
      sx[4] = xxi; sy[4] = yyi;
      }

      if (gin.state && 0x100) {
      xxe = gin.wX; yye = gin.wY;
      if (start)
        pls->line(5, sx, sy); /* clear previous rectangle */

      start = 1;

      sx[2] = xxe; sy[2] = yye;
      sx[1] = xxe; sy[1] = yyi;
      sx[3] = xxi; sy[3] = yye;
      pls->line(5, sx, sy); /* draw new rectangle */
      }

      if (gin.button == 3 || gin.keysym == PLK_Return || gin.keysym == 'Q') {
      if (start)
        pls->line(5, sx, sy); /* clear previous rectangle */
      break;
      }
    }
    pls->xormod(0, &st); /* leave xor mod */
  }

  if (xxe < xxi) {
    t=xxi; xxi=xxe; xxe=t;}

  if (yyi < yye) {
    t=yyi; yyi=yye; yye=t;}

  *xe = xxe; *xi = xxi;
  *ye = yye; *yi = yyi;

  return (gin.keysym == 'Q');
}

/* set gray colormap */
void x20::gray_cmap(PLINT num_col) {
  PLFLT r[2], g[2], b[2], pos[2];

  r[0] = g[0] = b[0] = 0.0;
  r[1] = g[1] = b[1] = 1.0;

  pos[0] = 0.0;
  pos[1] = 1.0;

  pls->scmap1n(num_col);
  pls->scmap1l(1, 2, pos, r, g, b, NULL);
}

int main( int argc, char ** argv ) {
  x20 *x = new x20( argc, argv );

  delete x;
}


//---------------------------------------------------------------------------//
//                              End of x20.cc
//---------------------------------------------------------------------------//

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