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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);
- }
-