Creating a Rainbow using Graphics Programming in C

In Turbo C graphics we use graphics.h functions to draw different shapes(like circle, rectangle etc), display text(any message) in different format(different fonts and colors). By using graphics.h we can make programs, animations and also games. These can be useful for beginners.

Functions Used :

delay(n): A function from dos.h header file is responsible for holding of the program for a while depending upon given value n.
setcolor(n): A function from graphics.h header file which set the color of pointer(cursor).
arc(x,y,a1,a2,r): A function from graphics.h header file which draw an arc with (x,y) as centre (a2-a1) as angle and r as radius.

Implementation:

// A C program to make a rainbow. This program would only 
// work in Turbo C compiler in DOS compatible machine 
#include<stdio.h> 
#include<graphics.h> 
#include<dos.h> 
  
// function for making of rainbow 
void rainbow() 
{ 
    // auto detection 
    int gdriver = DETECT,gmode; 
    int x, y, i; 
  
    // initialize graphics mode(passed three arguments to 
    // initgraph function) 
    // &gdriver is the address of gdriver variable, &gmode is 
    // the address of gmode and 
    //  "C:\\Turboc3\\BGI" is the directory path where BGI files are stored 
    initgraph(&gdriver,&gmode,"C:\\Turboc3\\BGI"); 
  
    x = getmaxx() / 2;//finding centre x-ordinate of screen 
    y = getmaxy() / 2;//finding centre y-ordinate of screen 
  
    for (i=30; i<200; i++) 
    { 
        // delay function under dos.h for holding the 
        // function for some time 
        delay(100); 
  
        // selecting  color for making of rainbow 
        setcolor(i/10); 
  
        // making of arc with fixed centre and increasing radius 
        arc(x, y, 0, 180, i-10); 
    } 
} 
// driver program 
int main() 
{ 
    rainbow(); 
    return 0; 
} 

Reference:http://www.xcnotes.com/graphics-in-c-language/draw-rainbow-in-c

This article is contributed by Shivam Pradhan (anuj_charm). If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

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