graphics in c draw circle with code examples

Graphics in C programming language is a widely used tool for creating visual displays and images. It allows you to draw various shapes with code and provides a visual representation of your code. Out of the many shapes, circle drawing is a basic shape that is used most commonly in graphics. In this article, we will go through the steps of drawing a circle in C programming language with code examples.

Before we dive into the code, let’s understand the basic concept of drawing a circle. A circle is a set of points that are equidistant from the center point. The radius is the distance from the center point to any of the points on the circumference. The equation of a circle is x^2 + y^2=r^2, where x and y are the coordinates of the point on the circumference, and r is the radius of the circle.

To draw a circle in C, we will be using the graphics.h library. This library contains various functions for drawing different shapes and colors onto the screen. The library can be used to create graphic applications and games on various platforms, including Windows, Linux, and Mac.

Let's start with the code example of drawing a circle in C.

First, we need to include the graphics.h header file in our program. This header file is not a standard C header file and is only available on certain compilers, such as Turbo C++. If you are using a different compiler, you will need to use a different graphics library.

#include<graphics.h> // Include the graphics header file

Next, we will initialize the graphics mode using the function initgraph(). This function initializes the graphics environment and sets up a window for us to draw on. The first parameter to this function is the graphics driver mode, and the second parameter is the graphics mode.

int gd= DETECT, gm; // Initialize the graphics driver and the graphics mode
initgraph(&gd,&gm,""); // Initialize the graphics mode

The DETECT constant instructs the function to automatically detect the graphics driver for the system, and the gm variable specifies the graphics mode. We set the graphics mode to “” to use the default graphics mode.

Now that we have initialized the graphics mode, we can start drawing our circle. The function we will use to draw a circle is circle(). The circle() function takes four parameters: the x-coordinate of the center of the circle, the y-coordinate of the center of the circle, the radius of the circle, and the color of the circle.

circle(250,250,100,YELLOW); // Draw a Yellow circle with center at (250,250) and radius as 100

The above example will create a yellow color circle with the center at (250,250) and the radius of 100.

To fill the circle, we can use the function fillellipse(). This function also takes four parameters: the x-coordinate of the center of the ellipse, the y-coordinate of the center of the ellipse, the x-radius of the ellipse, the y-radius of the ellipse, and the color.

fillellipse(250,250,100,100,RED); // Draw a red filled circle with center at (250,250) and radius as 100

The above example will create a red filled circle with the center at (250,250) and the radius of 100.

To see the created circle and get a hold of it, use the function getch(), which waits for a key to be pressed before the program continues.

getch(); // Wait for a key press before closing the window

Finally, the closegraph() function is used to close the graphics window.

closegraph(); // Close the graphics window and terminate the program

Conclusion:

Graphics in C programming language is a powerful tool for creating visual displays and images. In this article, we went through the process of drawing a circle using the graphics.h library. By using the circle() function, we can create a basic circle, and with the fillellipse() function, we can fill the circle with any color. These basic concepts can be the building blocks of complex visual displays and animations. To further explore graphics programming in C, developers can use various functions such as line(), rectangle(), and arc() to create more complex and intricate visuals.

here are some additional information on the previous topics.

  1. Data Structures in C:

Data Structures are an essential part of computer programming. They are a way of organizing and storing data in a way that allows for efficient access and modification. C language offers many built-in data structure types, such as arrays, structures, and unions. Additionally, C also allows developers to create their data structures through the use of pointers and memory allocation functions, such as malloc() and free().

Arrays are one of the simplest data structures in C, and they are used to store a collection of similar data types. The elements of an array can be accessed through their index value. Structures allow developers to group related data types under a single structure name, making it easier to handle and manipulate. Unions also group related data types, but they share the same memory location, saving memory space. Pointers allow for dynamic memory allocation and efficient use of memory by pointing to memory locations.

  1. Recursion in C:

Recursion is a programming technique where a function calls itself. It is a useful technique in solving problems that can be reduced to smaller sub-problems. Recursion is often used in programming languages like C to traverse data structures like trees and lists, and to implement algorithms like sorting and searching.

The key to a successful recursive function is defining the base case, which is the condition at which the function stops calling itself. The recursive case is the case where the function calls itself. To prevent infinite recursion, the function must have a defined stopping condition.

Recursive functions use the stack to keep track of their execution. Each time the function calls itself, a new stack frame is created, with its own set of local variables. When a base case is reached, the function starts returning values to the calling functions, and the stack frames are popped off the stack. Recursion can be a powerful tool, but it can also be slow and can use up a lot of memory. Hence, it is essential to use it wisely and optimally.

  1. Pointers in C:

Pointers are one of the most critical features of the C language, and they allow you to manipulate the memory directly. A pointer is a variable that stores the memory address of another variable. Pointers can be used to pass data between functions, to allocate and free memory dynamically, and to access arrays and structures.

Pointers are declared using the * symbol. They can be used to get the address of an existing variable using the & operator. They can also be used to access the value of a variable by using the * operator. Pointers can be assigned to other pointers, and they can be incremented or decremented like any other variable.

Dynamic memory allocation is another essential use of pointers in C. The functions malloc(), calloc() and realloc() are used to allocate and resize memory dynamically. Once the memory has been allocated, pointers can be used to access it. Pointers are also used with structures to access their members, and with arrays to access individual elements.

In conclusion, Data structures, Recursion and Pointers are three essential concepts in C programming. Understanding them is crucial for any C developer looking to write efficient and optimized code.

Popular questions

  1. What is the graphics.h library used for in C programming?

The graphics.h library is used in C programming for creating visual displays and images. It provides functions for drawing shapes, lines, and other graphics on a screen or window.

  1. What function is used to draw a circle in C using the graphics.h library?

The circle() function is used to draw a circle in C using the graphics.h library. It takes four parameters: the x-coordinate of the center of the circle, the y-coordinate of the center of the circle, the radius of the circle, and the color of the circle.

  1. How do you fill a circle in C programming using the graphics.h library?

You can fill a circle in C programming using the graphics.h library by using the function fillellipse(). This function takes five parameters: the x-coordinate of the center of the ellipse, the y-coordinate of the center of the ellipse, the x-radius of the ellipse, the y-radius of the ellipse, and the fill color.

  1. What is the equation for a circle and how is it used in graphics programming?

The equation for a circle is x^2 + y^2 = r^2, where x and y are the coordinates of a point on the circumference of the circle and r is the radius of the circle. This equation is used in graphics programming to calculate the coordinates of the points on the circumference of the circle and to determine the size and position of the circle on the screen or window.

  1. How do you terminate a graphics program in C using the graphics.h library?

To terminate a graphics program in C programming using the graphics.h library, you can use the function closegraph(). This function is used to close the graphics window or screen and terminate the graphics mode. Typically, this function is called at the end of the program after the main drawing code has been executed.

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