/* Program BAR_3.C
**
** Illustrates how to draw a bar to represent a quantity.
**
** P. H. Anderson, 7 Dec 94
*/

#include <stdio.h>
#include <graphics.h>
#include <dos.h>

/* #define XXX */

void draw_bar(int quan, int max_quan, int fill_color);

void main(void)
{
	int graphdriver = DETECT, graphmode, linestyle=0, n;

	char string[80];

	initgraph(&graphdriver, &graphmode, "c:\\turboc");
	/* detect and initialize graphics system */
	cleardevice();
	setlinestyle(SOLID_LINE, linestyle, NORM_WIDTH);

	for (n=0; n<200; n++) /* make it go up */
	{
	   draw_bar(n, 200, GREEN);
	   delay(100);
	}
	for (n=200; n>=0; n--)  /* make it go down */
	{
	   draw_bar(n, 200, GREEN);
	   delay(100);
	}
	closegraph();
}

void draw_bar(int quan, int max_quan, int fill_color)
{
   int startx = 300, endx = 350, starty = 400, endy;

   cleardevice();
   /* draw the new bar */
   endy = (400 - (int) ((float) quan / max_quan * 400));
   setcolor(WHITE);
   bar3d(startx, starty, endx, endy, 0, 0);
   setfillstyle(SOLID_FILL, fill_color);
   floodfill (325, (starty + endy) / 2, WHITE);

#ifdef XXX
   /* erase any old bar */  /* problem with flicker */
   setcolor(BLACK);
   bar3d(startx, endy, endx, 0, 0, 0);
   setfillstyle(SOLID_FILL, BLACK);
   floodfill (325, endy-10, BLACK);
#endif