Home » C Program to Draw and Fill Color in a Polygon

C Program to Draw and Fill Color in a Polygon

In the previous article, you learn to draw a polygon shape with N points. In this article, you will learn to draw a polygon and fill color in it using graphics functions.

Problem Definition

If you want to draw a polygon shape with N points, where a point is represented using (x, y) coordinates, then use drawpoly ( ) function from graphics.h header file of C language.

But we want to draw a polygon and fill some color in it. To write a program that draws a polygon and fill color or pattern follow the steps given below:

  • Declare all graphics and non-graphics variables.
  • Initialize the variables.
  • Initialize the graph while a path points to the graphics files – BGI.
  • Initilize the polygon array where each pair is a point in the polygon.
  • Set fill style and color for the polygon shape.
  • Draw the polygon.
  • Close the graph.

Program Code – fillpoly ( ) with Color

/* C Program to draw a Polygon and fill color in C language */

#include <graphics.h>
#include <stdio.h>
#include <stdlib.h>
#include <conio.h>

int main()
{
/* Declaring a variable */

int gdriver, gmode;

/* Polygon array to define points on the polygon shape */

int poly[10];

/* Initialize the variables */

gdriver = DETECT;

/* Initialize the graph and set path to BGI files */

initgraph(&gdriver, &gmode, "D:\\TURBOC3\\BGI");

/* Polygon Points in Pairs */


poly[0] = 20; /* 1st vertex */
poly[1] = 100;

poly[2] = 120;
poly[3] = 140; /* 2nd vertex */

poly[4] = 240;
poly[5] = 260; /* 3rd vertex */

poly[6] = 120;
poly[7] = 320; /* 4th vertex */

poly[8] = poly[0];
poly[9] = poly[1]; /* The polygon does not
close automatically, so we close it */

/* Set the fill style for the Polygon */

setcolor(getmaxcolor());

setfillstyle(SOLID_FILL, RED);

/* Draw the Polygon */

fillpoly(5, poly);

getch();

/* Close the graph */

closegraph();
return 0;

}

Output – Fillpoly ()

Output - Fillpoly ( ) function
Output – Fillpoly ( ) function
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