How to create bar chart in computer graphics (16-03-2020)

Creating a bar chart in C with graphics.h library is very decent to show the result in a graphical form. To have a graph in your program first thing to do is to initialize a graph.

Second thing is, initialize X axis and Y axis of the graph. This can be done by calling the line function twice with the co-ordinate of the endpoints of both the axis.

The third step is to create bars. Now to create bars, you can easily choose a styling for the bar by calling the function setfillstyle(LINE_FILL, RED) before making the bar.

Fourth and the last step is to make the bar with four parameters which should be numbered. These numbers will be the co-ordinates of the bars.

These functions need the graphic.h file to be included in the program before using any of these functions.

graphics.h - line(), bar() and setfillstyle() functions 

#include <graphics.h>

#include <conio.h>

int main()

{

   int gd = DETECT, gm;

// detect graphic mode and initialize graphic display

initgraph(&gd, &gm, "..//BGI");

//initialize graph by checking graphic display, graphic mode and loading graphic driver from disk

setcolor(YELLOW);

// set color of the outer rectangle

rectangle(0,30,639,450);

//Outer rectangle or outer box

settextstyle(SANS_SERIF_FONT,HORIZ_DIR,2);

// Upper heading font style, font direction, and font size

setcolor(WHITE);

//font color

outtextxy(275,0,"Bar Chart");

//outtextxy is used to display text at specific position

 setlinestyle(SOLID_LINE,0,1);

//y-axis line style, pattern and thickness

line(100,420,100,60);

// line co-ordinates x1,y1,x2,y2

line(100,420,600,420); 

// x-axis line

line(90,70,100,60);

//y-axis arrow left side

line(110,70,100,60);

// y-axis arrow-right-side

line(590,410,600,420);

//x-axis arrow-left-side

 line(590,430,600,420);

//x-axis arrow right side

outtextxy(95,35,"Y");  

// write Y for  y-axis

   outtextxy(610,405,"X");

//write X for x-axis

   outtextxy(85,415,"O");     

// write O for origin

setfillstyle(LINE_FILL,BLUE);

// first bar filling style and color

bar(150,100,200,419);

// bar (left,top,right, bottom)

setfillstyle(XHATCH_FILL,RED); 

//second bar filling sytle and color

bar(225,150,275,419);        

//bar (left,top,right, bottom)

setfillstyle(WIDE_DOT_FILL,GREEN);

// third bar filling style and color

bar(300,200,350,419);           

//bar (left,top,right,bottom)

setfillstyle(INTERLEAVE_FILL,MAGENTA);

//forth barfilling style and color

bar(375,125,425,419);      

//bar (left,top,right,bottom)

setfillstyle(HATCH_FILL,BROWN); 

//fifth bar filling sytle and color

   bar(450,175,500,419);          

// bar (left, top, right, bottom)

   getch();

   return 0;

}