Bar Graph

/*

* THIS IS A C PROGRAM THAT DRAWS LINE GRAPH AND BAR GRAPH FOR THE GIVEN SETS OF INPUTS.

* DATA MAY RANGE FROM 0.0001 TO 1050000.

*/

#include <stdio.h>

#include <conio.h>

#include <graphics.h>

#include <stdlib.h>

#include <dos.h>

#include <math.h>

typedef struct

{

int x,y;

} POINT;

void Fill_Rect(int,int,int,int,int);

int main()

{

int graphdriver , graphmode, N, i, pos=120;

int maxy=getmaxy(),maxx=getmaxx();

double v[20],f[20], min=v[0],max=v[0];

double MAX=400.0,MIN=50.0,a,b,width=20.0,spacing;

char temp[50];

detectgraph(&graphdriver,&graphmode);

initgraph(&graphdriver,&graphmode,"C:\\TC\\BGI");

if(graphresult()!=grOk) {

closegraph();

return 0;

}

printf("Enter the number of data(<20) :  ");

scanf("%d",&N);

if(N>=20)

    N=20;

if(N<=0) 

    N=1;

for(i=0;i<N;++i)

   scanf("%lf",v+i);

for(i=0;i<N;++i)

{

   if(min>v[i])

        min=v[i];

   if(max<v[i])

       max=v[i];

}

if(N!=1)

     spacing=(400.0-width)/(double)(N-1);

a=(MAX-MIN)/log(max/min);

b=MAX-a*log(max);

for(i=0;i<N;++i)

   f[i]=a*log(v[i])+b;

cleardevice();

line(100,maxy-MIN,maxx,maxy-MIN);

line(100,0,100,maxy-MIN);

settextstyle(2,0,4);

for(i=0;i<N;++i)

{

            bar3d(pos,maxy-f[i]-20,pos+width,maxy-MIN,width/4,1);

            setlinestyle(DASHED_LINE,1,1);

            line(pos,maxy-f[i]-20,100,maxy-f[i]-20);

            sprintf(temp,"%f",v[i]);

            outtextxy(3,maxy-f[i]-20,temp);

            setlinestyle(SOLID_LINE,1,1);

            pos+=spacing;

}

getch();

cleardevice();

line(100,maxy-MIN,maxx,maxy-MIN);

line(100,0,100,maxy-MIN);

pos=120;

for(i=0;i<N-1;++i)   

 {

            line(pos,maxy-f[i]-20,pos+width+spacing,maxy-f[i+1]-20);

            pos+=width+spacing;

}

getch();

closegraph();

return 0;

}