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putpixel() function in C

  • Difficulty Level : Medium
  • Last Updated : 23 Jan, 2018

The header file graphics.h contains putpixel() function which plots a pixel at location (x, y) of specified color.
Syntax :

void putpixel(int x, int y, int color);

(x, y) is the location at which pixel
is to be put , and color specifies 
the color of the pixel.

Explanation : A RED color pixel at (50, 40) can be drawn by using putpixel(50, 40, RED). putpixel() function can be used to draw circles, lines and ellipses using various algorithms.

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Below is the implementation of putpixel() function.

// C Implementation for putpixel()
#include <graphics.h>
#include <stdio.h>
// driver code
int main()
    // gm is Graphics mode which is
    // a computer display mode that
    // generates image using pixels.
    // DETECT is a macro defined in
    // "graphics.h" header file
    int gd = DETECT, gm, color;
    // initgraph initializes the
    // graphics system by loading a
    // graphics driver from disk
    initgraph(&gd, &gm, "");
    // putpixel function
    putpixel(85, 35, GREEN);
    putpixel(30, 40, RED);
    putpixel(115, 50, YELLOW);
    putpixel(135, 50, CYAN);
    putpixel(45, 60, BLUE);
    putpixel(20, 100, WHITE);
    putpixel(200, 100, LIGHTBLUE);
    putpixel(150, 100, LIGHTGREEN);
    putpixel(200, 50, YELLOW);
    putpixel(120, 70, RED);
    // closegraph function closes the
    // graphics mode and deallocates
    // all memory allocated by
    // graphics system .
    return 0;

Output :

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