The C graphic header file has a builtin function to draw various geometric shapes such as lines, circles, polygons, and quadrilaterals. In this article, you will learn to draw a rectangle using C programming graphics support.
Problem Definition
To draw the rectangle using C graphics support, we write a program that does the following:
- Declare all graphic variables including graphic driver.
- Initialize all graphic variables.
- Initialization of graph and set path to graphic library support in C compiler.
- Set the line style for rectangle.
- Draw the rectangle.
- Close the graph.
Source Code – Draw Rectangle
/* Program to draw a rectangle using C graphic support */
#include <stdio.h>
#include <conio.h>
#include <graphics.h>
#include <stdlib.h>
int main() /* Main function begins */
{
/* Declare the graphic variables */
int gdriver, gmode, userpattern;
int left, right, top, bottom;
/* Initialize the graphic driver to autodetect the graphic drivers */
gdriver = DETECT;
userpattern = 1;
/* Initialization of graph and path set to graphic interface */
initgraph(&gdriver, &gmode, "D:\\TURBOC3\\BGI");
/* Set the line style */
setlinestyle(SOLID_LINE,userpattern,3);
/* Draw the line */
left = 100;
top = 80;
bottom = 220;
right = 350;
rectangle(left, top, right, bottom);
/* close the graph */
getch();
closegraph();
return 0;
}The most important code is setting dimensions of the rectangle which draw the shape.
left = 100;
top = 80;
bottom = 220;
right = 350;
Each variable is a corner point of the rectangle that defines the length and breadth of the sides of the rectangle. The left is 100 px in x-axis direction, top is 80 px in y-axis direction, the bottom is 220 px in x-axis and the right is 350 px in y-axis direction.
The (right – left) is 250px ( longer side) and the (bottom – top) is 120 px (shorter side) of the rectangle.
Output
