Logo Search packages:      
Sourcecode: plplot version File versions  Download package

x01.cc

//---------------------------------------------------------------------------//
// $Id: x01.cc,v 1.13 2004/03/26 08:30:41 andrewross 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 1 in C++.
//---------------------------------------------------------------------------//

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

#include <iostream>
#include <cctype>

#ifdef HAVE_CMATH
#include <cmath>
#else
#include <math.h>
#endif

#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

#ifdef USE_NAMESPACE
using namespace std;
#endif

static PLGraphicsIn gin;

static int locate_mode;
static int test_xor;
static int fontset;
static char *f_name;

static char *notes[] = {"Make sure you get it right!", ""};

/* Options data structure definition. */
static PLOptionTable options[] = {
  {
    "locate",                   /* Turns on test of API locate function */
    NULL,
    NULL,
    &locate_mode,
    PL_OPT_BOOL,
    "-locate",
    "Turns on test of API locate function" },
  {
    "xor",                      /* Turns on test of xor function */
    NULL,
    NULL,
    &test_xor,
    PL_OPT_BOOL,
    "-xor",
    "Turns on test of XOR" },
  {
    "font",                     /* For switching between font set 1 & 2 */
    NULL,
    NULL,
    &fontset,
    PL_OPT_INT,
    "-font number",
    "Selects stroke font set (0 or 1, def:1)" },
  {
    "save",                     /* For saving in postscript */
    NULL,
    NULL,
    &f_name,
    PL_OPT_STRING,
    "-save filename",
    "Save plot in color postscript `file'" },
  {
    NULL,                       /* option */
    NULL,                       /* handler */
    NULL,                       /* client data */
    NULL,                       /* address of variable to set */
    0,                          /* mode flag */
    NULL,                       /* short syntax */
    NULL }                      /* long syntax */
};


class x01 {

public:
  x01(int, char **);

  void plot1(int);
  void plot2();
  void plot3();


private:
  // Class data
  PLFLT xscale, yscale, xoff, yoff;
  plstream *pls;


};


x01::x01( int argc, char ** argv ) {

  PLINT cur_strm, new_strm;
  char ver[80];

  fontset = 1;
  f_name = NULL;


  // plplot initialization
  // Divide page into 2x2 plots unless user overrides.

  pls = new plstream();

  pls->ssub(2, 2);

  // Parse and process command line arguments.
  pls->MergeOpts(options, "x01c options", notes);
  pls->ParseOpts( &argc, argv, PL_PARSE_FULL );

  // Print out version number, just for kicks.
  pls->gver(ver);

  cout << "PLplot library version: " <<  ver << endl;


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

  // Select the multi-stroke font.
  pls->fontld( 1 );

  // Set up the data
  // Original case

  xscale = 6.;
  yscale = 1.;
  xoff = 0.;
  yoff = 0.;

  // Do a plot
  plot1(0);

  // Set up the data

  xscale = 1.;
  yscale = 0.0014;
  yoff = 0.0185;

  // Do a plot

  int digmax = 5;
  pls->syax(digmax, 0);

  plot1(1);

  plot2();

  plot3();

  // Show how to save a plot:
  // Open a new device, make it current, copy parameters,
  // and replay the plot buffer

  if (f_name) { // command line option '-save filename'

    cout << "The current plot was saved in color Postscript under the name `" <<  f_name << "'" << endl;
    plstream *pls2;
    
    pls2 = new plstream();     /* create a new one */

    pls2->sfnam(f_name);       /* file name */
    pls2->sdev("psc");         /* device type */

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

    }

  // Let's get some user input

  if (locate_mode) {
    while (1) {
      if (! pls->GetCursor(&gin)) break;
      if (gin.keysym == PLK_Escape) break;

      pls->text();
      if (gin.keysym < 0xFF && isprint(gin.keysym))
      cout << "wx = " << gin.wX << ", wy = " << gin.wY <<
        ", dx = " << gin.dX << ",  dy = " << gin.dY <<
        ",  c = '" << gin.keysym << "'" << endl;
      else
      cout << "wx = " << gin.wX << ", wy = " << gin.wY <<
        ", dx = " << gin.dX << ",  dy = " << gin.dY <<
        ",  c = '" << gin.keysym << "'" << endl;
      //    printf("wx = %f,  wy = %f, dx = %f,  dy = %f,  c = 0x%02x\n",
      //                              gin.wX, gin.wY, gin.dX, gin.dY, gin.keysym);

      pls->gra();
    }
  }

  // In C++ we don't call plend() to finish off
  // this is handled by the destructor
  delete pls;
}

void x01::plot1( int do_test )
{
  int i;
  PLINT st;
  PLFLT xmin, xmax, ymin, ymax;
  PLFLT *x = new PLFLT[60];
  PLFLT *y = new PLFLT[60];
  PLFLT *xs = new PLFLT[6];
  PLFLT *ys = new PLFLT[6];

  for( i=0; i < 60; i++ )
    {
      x[i] = xoff + xscale * (i + 1) / 60.0;
      y[i] = yoff + yscale * pow(x[i], 2.);
    }

  xmin = x[0];
  xmax = x[59];
  ymin = y[0];
  ymax = y[59];

  for( i=0; i < 6; i++ )
    {
      xs[i] = x[i * 10 + 3];
      ys[i] = y[i * 10 + 3];
    }

  // Set up the viewport and window using PLENV. The range in X is 0.0 to
  // 6.0, and the range in Y is 0.0 to 30.0. The axes are scaled separately
  // (just = 0), and we just draw a labelled box (axis = 0).

  pls->col0(1);
  pls->env( xmin, xmax, ymin, ymax, 0, 0 );
  pls->col0(2);
  pls->lab( "(x)", "(y)", "#frPLplot Example 1 - y=x#u2" );

  // Plot the data points.

  pls->col0(4);
  pls->poin( 6, xs, ys, 9 );

  // Draw the line through the data.

  pls->col0(3);
  pls->line(60, x, y);

/* xor mode enable erasing a line/point/text by replotting it again */
/* it does not work in double buffering mode, however */

  if (do_test && test_xor) {
#ifdef HAVE_USLEEP
    pls->xormod(1, &st); /* enter xor mode */
    if (st) {
      for (i=0; i<60; i++) {
      pls->poin(1, x+i, y+i,9);      /* draw a point */
      usleep(50000);              /* wait a little */
      pls->flush();                  /* force an update of the tk driver */
      pls->poin(1, x+i, y+i,9);      /* erase point */
      }
      pls->xormod(0, &st);                     /* leave xor mode */
    }
#else
    cout << "The -xor command line option can only be exercised if your system has usleep(), which does not seems to happen." << endl;
#endif
  }

  delete[] x;
  delete[] y;
  delete[] xs;
  delete[] ys;
}

void x01::plot2()
{
  int i;
  PLFLT *x = new PLFLT[100];
  PLFLT *y = new PLFLT[100];

  // Set up the viewport and window using PLENV. The range in X is -2.0 to
  // 10.0, and the range in Y is -0.4 to 2.0. The axes are scaled
  // separately (just = 0), and we draw a box with axes (axis = 1).

  pls->col0(1);
  pls->env(-2.0, 10.0, -0.4, 1.2, 0, 1);
  pls->col0(2);
  pls->lab("(x)", "sin(x)/x", "#frPLplot Example 1 - Sinc Function");

  // Fill up the arrays.

  for (i = 0; i < 100; i++) {
    x[i] = (i - 19.0) / 6.0;
    y[i] = 1.0;
    if (x[i] != 0.0)
      y[i] = sin(x[i]) / x[i];
  }

  // Draw the line.

  pls->col0(3);
  pls->wid(2);
  pls->line(100, x, y);
  pls->wid(1);

  delete[] x;
  delete[] y;
}

void x01::plot3()
{
  int i;
  int space0 = 0;
  int mark0 = 0;
  int space1 = 1500;
  int mark1 = 1500;
  PLFLT *x = new PLFLT[101];
  PLFLT *y = new PLFLT[101];

  // For the final graph we wish to override the default tick intervals,
  // and so do not use plenv().

  pls->adv(0);

  // Use standard viewport, and define X range from 0 to 360 degrees, Y
  // range from -1.2 to 1.2.

  pls->vsta();
  pls->wind( 0.0, 360.0, -1.2, 1.2 );

  // Draw a box with ticks spaced 60 degrees apart in X, and 0.2 in Y.

  pls->col0(1);
  pls->box("bcnst", 60.0, 2, "bcnstv", 0.2, 2);

  // Superimpose a dashed line grid, with 1.5 mm marks and spaces.
  // plstyl expects a pointer!

  pls->styl(1, &mark1, &space1);
  pls->col0(2);
  pls->box("g", 30.0, 0, "g", 0.2, 0);
  pls->styl(0, &mark0, &space0);

  pls->col0(3);
  pls->lab( "Angle (degrees)", "sine",
          "#frPLplot Example 1 - Sine function" );

  for (i = 0; i < 101; i++) {
    x[i] = 3.6 * i;
    y[i] = sin(x[i] * M_PI / 180.0);
  }

  pls->col0(4);
  pls->line(101, x, y);

  delete[] x;
  delete[] y;
}

int main( int argc, char ** argv ) {
  x01 *x = new x01( argc, argv );
  delete x;

}


//---------------------------------------------------------------------------//
//                              End of x01.cc
//---------------------------------------------------------------------------//

Generated by  Doxygen 1.6.0   Back to index