HowToC:DrawLines
From S2PLOT
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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 = normal line
- 2 = dashed
- 3 = dot-dash-dot-dash
- 4 = dotted
- 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:
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
