/usr/share/doc/libplplot11/examples/c/x01c.c is in libplplot-dev 5.9.9-2ubuntu2.
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//
// Simple line plot and multiple windows demo.
//
// Copyright (C) 2004 Rafael Laboissiere
//
// 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; either version 2 of the License, or
// (at your option) any later version.
//
// 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
//
//
#include "plcdemos.h"
#include "plevent.h"
#ifdef PL_HAVE_UNISTD_H
# include <unistd.h>
#endif
// Variables and data arrays used by plot generators
static PLFLT x[101], y[101];
static PLFLT xscale, yscale, xoff, yoff, xs[6], ys[6];
static PLGraphicsIn gin;
static int locate_mode;
static int test_xor;
static int fontset = 1;
static char *f_name = NULL;
// 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
};
const char *notes[] = { "Make sure you get it right!", NULL };
// Function prototypes
void plot1( int );
void plot2( void );
void plot3( void );
//--------------------------------------------------------------------------
// main
//
// Generates several simple line plots. Demonstrates:
// - subwindow capability
// - setting up the window, drawing plot, and labelling
// - changing the color
// - automatic axis rescaling to exponential notation
// - placing the axes in the middle of the box
// - gridded coordinate axes
//--------------------------------------------------------------------------
int
main( int argc, const char *argv[] )
{
PLINT digmax, cur_strm, new_strm;
char ver[80];
// plplot initialization
// Parse and process command line arguments
plMergeOpts( options, "x01c options", notes );
plparseopts( &argc, argv, PL_PARSE_FULL );
// Get version number, just for kicks
plgver( ver );
fprintf( stdout, "PLplot library version: %s\n", ver );
// Initialize plplot
// Divide page into 2x2 plots
// Note: calling plstar replaces separate calls to plssub and plinit
plstar( 2, 2 );
// Select font set as per input flag
if ( fontset )
plfontld( 1 );
else
plfontld( 0 );
// 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
digmax = 5;
plsyax( 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'
{
printf( "The current plot was saved in color Postscript under the name `%s'.\n", f_name );
plgstrm( &cur_strm ); // get current stream
plmkstrm( &new_strm ); // create a new one
plsfnam( f_name ); // file name
plsdev( "psc" ); // device type
plcpstrm( cur_strm, 0 ); // copy old stream parameters to new stream
plreplot(); // do the save by replaying the plot buffer
plend1(); // finish the device
plsstrm( cur_strm ); // return to previous stream
}
// Let's get some user input
if ( locate_mode )
{
for (;; )
{
if ( !plGetCursor( &gin ) )
break;
if ( gin.keysym == PLK_Escape )
break;
pltext();
if ( gin.keysym < 0xFF && isprint( gin.keysym ) )
printf( "subwin = %d, wx = %f, wy = %f, dx = %f, dy = %f, c = '%c' s = '%s'\n",
gin.subwindow, gin.wX, gin.wY, gin.dX, gin.dY, gin.keysym, gin.string );
else
printf( "subwin = %d, wx = %f, wy = %f, dx = %f, dy = %f, c = 0x%02x s - '%s'\n",
gin.subwindow, gin.wX, gin.wY, gin.dX, gin.dY, gin.keysym, gin.string );
plgra();
}
}
// Don't forget to call plend() to finish off!
plend();
exit( 0 );
}
//--------------------------------------------------------------------------
void
plot1( int do_test )
{
int i;
PLFLT xmin, xmax, ymin, ymax;
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).
//
plcol0( 1 );
plenv( xmin, xmax, ymin, ymax, 0, 0 );
plcol0( 2 );
pllab( "(x)", "(y)", "#frPLplot Example 1 - y=x#u2" );
// Plot the data points
plcol0( 4 );
plpoin( 6, xs, ys, 9 );
// Draw the line through the data
plcol0( 3 );
plline( 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 PL_HAVE_USLEEP
PLINT st;
plxormod( 1, &st ); // enter xor mode
if ( st )
{
for ( i = 0; i < 60; i++ )
{
plpoin( 1, x + i, y + i, 9 ); // draw a point
usleep( 50000 ); // wait a little
plflush(); // force an update of the tk driver
plpoin( 1, x + i, y + i, 9 ); // erase point
}
plxormod( 0, &st ); // leave xor mode
}
#else
printf( "The -xor command line option can only be exercised if your "
"system\nhas usleep(), which does not seem to happen.\n" );
#endif
}
}
//--------------------------------------------------------------------------
void
plot2( void )
{
int i;
// 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).
//
plcol0( 1 );
plenv( -2.0, 10.0, -0.4, 1.2, 0, 1 );
plcol0( 2 );
pllab( "(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
plcol0( 3 );
plwid( 2 );
plline( 100, x, y );
plwid( 1 );
}
//--------------------------------------------------------------------------
void
plot3( void )
{
PLINT space0 = 0, mark0 = 0, space1 = 1500, mark1 = 1500;
int i;
// For the final graph we wish to override the default tick intervals, and
// so do not use plenv().
//
pladv( 0 );
// Use standard viewport, and define X range from 0 to 360 degrees, Y range
// from -1.2 to 1.2.
//
plvsta();
plwind( 0.0, 360.0, -1.2, 1.2 );
// Draw a box with ticks spaced 60 degrees apart in X, and 0.2 in Y.
plcol0( 1 );
plbox( "bcnst", 60.0, 2, "bcnstv", 0.2, 2 );
// Superimpose a dashed line grid, with 1.5 mm marks and spaces.
// plstyl expects a pointer!
//
plstyl( 1, &mark1, &space1 );
plcol0( 2 );
plbox( "g", 30.0, 0, "g", 0.2, 0 );
plstyl( 0, &mark0, &space0 );
plcol0( 3 );
pllab( "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 );
}
plcol0( 4 );
plline( 101, x, y );
}
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