78 lines
2.5 KiB
C++
78 lines
2.5 KiB
C++
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#include <stdio.h>
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#include <stdlib.h>
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#include <conio.h>
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#include <string.h>
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#include <graphics.h>
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#include <malloc.h>
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#define MODE CGA_320 /* set screen mode */
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#define CHARSIZE 8 /* size of plotted characters */
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main(int argc, char *argv[]) {
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int oldmode;
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int mode;
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int sections;
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int index;
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struct vconfig screen_data;
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struct fill_pattern *fill_data;
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double *data;
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char title[80];
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int xtitle, ytitle;
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extern int screen(int oldmode, int dfltmode);
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extern struct fill_pattern *patterns(struct vconfig *screen_data,
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int sections);
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puts("This program displays a pie chart on the screen. You must");
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puts("have graphics capability (CGA, EGA, MCGA or VGA) to run it.\n");
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puts("Press <esc> to terminate, any other key to continue.\n");
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if (getch() == '\x1b') return 0;
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printf("Title: ");
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gets(title);
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printf("%s","Enter the number of sections in the pie: ");
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scanf("%d",§ions);
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data = calloc(sections,sizeof(double));
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printf("\nEnter %d values: ",sections);
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for (index = 0; index < sections; ++index)
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scanf("%*c%lf",&data[index]);
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oldmode = getvmode(); /* current screen mode */
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if (argc > 1) mode = atoi(argv[1]); else mode = MODE;
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if ((mode = screen(oldmode,mode)) == -1) {
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puts("** Unable to set the screen to graphics mode **");
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setvmode(oldmode);
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return 1;
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}
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getvconfig(&screen_data); /* fetch the screen parameters */
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fill_data = patterns(&screen_data,sections);
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/* create the pie chart in the center of the screen */
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clrscrn2(0);
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pen_color(screen_data.colors-1);
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move_to(screen_data.xpixels>>1, screen_data.ypixels>>1);
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pie(screen_data.xpixels/4, data, sections, fill_data);
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/* display the title in the center of the screen */
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move_to((screen_data.xpixels - CHARSIZE*strlen(title))/2,0);
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plots(title);
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/* display the values */
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for (index = 0; (index < 10) && (index < sections); ++index) {
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/* calculate screen coordinates */
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if (index >= 5) xtitle = screen_data.xpixels*4/5; else xtitle = 0;
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ytitle = screen_data.ypixels-(CHARSIZE+2)*(5-index%5)-2;
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move_to(xtitle,ytitle);
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fill_style(fill_data->pattern,fill_data->width,fill_data->height);
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++fill_data;
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flood(CHARSIZE*2,CHARSIZE);
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sprintf(title,"%g",data[index]);
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move_to(xtitle+3*CHARSIZE,ytitle);
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plots(title);
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}
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getch(); /* wait for a key */
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setvmode(oldmode);
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} /* end of main */
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