HowToC:DrawLines

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Drawing Lines

As with points, you can use either the PGPLOT-style functions or the native S2PLOT routines.

Lines example

Copy and paste the following code, and save the file as s2lines.c

#include <stdio.h>
#include <stdlib.h>
#include "s2plot.h"

int main(int argc, char *argv[])
{
   float xmin = -1, xmax = +1;          /* X data range */
   float ymin = -1, ymax = +1;          /* Y data range */
   float zmin = -1, zmax = +1;          /* Z data range */

   s2opend("/?",argc,argv);             /* Which S2PLOT device to open? */
   s2swin(xmin, xmax, ymin, ymax, zmin, zmax);  /* Set the display coordinates */

   float x[10], y[10], z[10];
   int i;
   for (i=0;i<10;i++) {
      x[i] = drand48()*(xmax-xmin) + xmin;
      y[i] = drand48()*(ymax-ymin) + ymin;
      z[i] = drand48()*(zmax-zmin) + zmin;
   }
   s2line(10, x, y, z);

   s2show(1);                           /* Hand over to the display */

   return 1;
}

The line-style and thickness are controlled using the s2sls and s2slw functions. To see what they do, put the following code:

  s2sls(style);
  s2slw(width);

before the s2line function call, where style is an integer that selects one of:

1. 1 = normal line
2. 2 = dashed
3. 3 = dot-dash-dot-dash
4. 4 = dotted
5. 5 = dash-dot-dot-dot

and width is the line width in pixels.

Experiment for yourself

Function Overview

For more information on the functions we have introduced so far, see:

• s2line
• s2slw
• s2sls
• s2arro
• s2sah
• s2qah
• s2errb
• ns2line
• ns2line
• ns2line
• ns2line
• ns2line
• ns2line

Common Problems

Test code: s2points.c

This is the full test code for the point-drawing example.

Where to Next?

• Back to S2PLOT How To...
• Drawing circles and disks