lines.c

Intro/: Directory containing introductory examples. HelloWorld.c A simple program that draws a bo

#include <phigs.h>			/* get HP-PHIGS definitions for C */
#include <stdio.h>			/* get standard I/O definitions */

main()					/* file "Lines.c" */
{
    Pint	WorkstnID = 1;		/* workstation identifier */
    Pint	ConnID;			/* connection identifier */
    Pint	WorkstnType = POIDDX;	/* out/in, direct, dbl bfr, Xwindow */
    Pint	TheCurve = 1;		/* structure ID (chosen by user) */
    Ppoint	LinePts[100];		/* points for the polyline */
    Ppoint_list	LineData;		/* data for the polyline */
    FILE	*datafile;		/* file pointer */
    int		I = 0;			/* loop control variable */

    /*=== read data file into the structure array ==========================*/
    datafile = fopen("data", "r");	/* open data file (2 numbers/line) */
    while (fscanf(datafile, "%f%f", &LinePts[I].x, &LinePts[I].y) != EOF)
	I++;
    fclose(datafile);
    LineData.num_points = I;
    LineData.points = LinePts;
    /*=== set up HP-PHIGS to plot data =====================================*/
    popen_phigs((char *) stderr, 0);	/* errors go to "stderr" */
    pescape_u4("/dev/screen/phigs_window", &ConnID);
    popen_ws(WorkstnID, (void *) ConnID, WorkstnType);
    popen_struct(TheCurve);
    ppolyline(&LineData);
    pclose_struct();
    /*=== post the image and close up shop =================================*/
    ppost_struct(WorkstnID, TheCurve, 1.0);
    pupd_ws(WorkstnID, PFLAG_PERFORM);	/* (regeneration flag) */
    pclose_ws(WorkstnID);
    pclose_phigs();
}