Bar chart demo

 #pragma _ipath "./"
 #include "plcdemos.h"
 
 void
 plfbox(PLFLT x0, PLFLT y0);
 
 
 int
 main(int argc, char *argv[])
 {
     int i;
     char string[20];
     PLFLT y0[10];
 
 
     (void) plParseOpts(&argc, argv, PL_PARSE_FULL);
 
 
     plinit();
 
     pladv(0);
     plvsta();
     plwind(1980.0, 1990.0, 0.0, 35.0);
     plbox("bc", 1.0, 0, "bcnv", 10.0, 0);
     plcol0(2);
     pllab("Year", "Widget Sales (millions)", "#frPLplot Example 12");
 
     y0[0] = 5;
     y0[1] = 15;
     y0[2] = 12;
     y0[3] = 24;
     y0[4] = 28;
     y0[5] = 30;
     y0[6] = 20;
     y0[7] = 8;
     y0[8] = 12;
     y0[9] = 3;
 
     for (i = 0; i < 10; i++) {
 	plcol0(i + 1);
 	plpsty(0);
 	plfbox((1980. + i), y0[i]);
 	sprintf(string, "%.0f", y0[i]);
 	plptex((1980. + i + .5), (y0[i] + 1.), 1.0, 0.0, .5, string);
 	sprintf(string, "%d", 1980 + i);
 	plmtex("b", 1.0, ((i + 1) * .1 - .05), 0.5, string);
     }
 
 
     plend();
     exit(0);
 }
 
 void
 plfbox(PLFLT x0, PLFLT y0)
 {
     PLFLT x[4], y[4];
 
     x[0] = x0;
     y[0] = 0.;
     x[1] = x0;
     y[1] = y0;
     x[2] = x0 + 1.;
     y[2] = y0;
     x[3] = x0 + 1.;
     y[3] = 0.;
     plfill(4, x, y);
     plcol0(1);
     pllsty(1);
     plline(4, x, y);
 }