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Turnbull China Bikeride
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x13c.c
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1994-06-30
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/* $Id: x13c.c,v 1.7 1994/06/30 17:57:51 mjl Exp $
* $Log: x13c.c,v $
* Revision 1.7 1994/06/30 17:57:51 mjl
* All C example programs: made another pass to eliminate warnings when using
* gcc -Wall. Lots of cleaning up: got rid of includes of math.h or string.h
* (now included by plplot.h), eliminated redundant casts, put in more
* uniform comments, and other minor changes.
*
* Revision 1.6 1994/03/30 07:21:57 mjl
* Changes to all C example programs: special handling for malloc re: header
* files eliminated, include of stdio.h and stdlib.h eliminated (now done
* by plplot.h), include of "plplot.h" changed to <plplot.h> to enable
* simpler builds by the general user, some cleaning up also.
*/
/* x13c.c
Pie chart demo.
*/
#include <plplot.h>
#ifndef PI
#define PI 3.141592654
#endif
static char *text[] =
{
"Maurice",
"Randy",
"Mark",
"Steve",
"Warner"
};
/*----------------------------------------------------------------------*\
* main
*
* Does a simple pie chart.
\*----------------------------------------------------------------------*/
int
main(int argc, char *argv[])
{
int i, j;
PLFLT dthet, theta0, theta1, theta, just, dx, dy;
static PLFLT x[500], y[500], per[5];
per[0] = 10.;
per[1] = 32.;
per[2] = 12.;
per[3] = 30.;
per[4] = 16.;
/* Parse and process command line arguments */
(void) plParseInternalOpts(&argc, argv, PL_PARSE_FULL);
/* Initialize plplot */
plinit();
plenv(0., 10., 0., 10., 1, -2);
plcol(2);
theta0 = 0.;
dthet = 2 * PI / 500;
for (i = 0; i <= 4; i++) {
j = 0;
x[j] = 5.;
y[j++] = 5.;
theta1 = theta0 + 2 * PI * per[i] / 100.;
if (i == 4)
theta1 = 2 * PI;
for (theta = theta0; theta <= theta1; theta += dthet) {
x[j] = 5 + 3 * cos(theta);
y[j++] = 5 + 3 * sin(theta);
}
plcol(i + 1);
plpsty((i + 3) % 8 + 1);
plfill(j, x, y);
plcol(1);
plline(j, x, y);
just = (theta0 + theta1) / 2.;
dx = .25 * cos(just);
dy = .25 * sin(just);
if (just < PI / 2 || just > 3 * PI / 2)
just = 0.;
else
just = 1.;
plptex((x[j / 2] + dx), (y[j / 2] + dy), 1.0, 0.0, just, text[i]);
theta0 = theta - dthet;
}
plfont(2);
plschr(0., 1.3);
plptex(5.0, 9.0, 1.0, 0.0, 0.5, "Percentage of Sales");
/* Don't forget to call PLEND to finish off! */
plend();
exit(0);
}