PHP | imagesetpixel() Function

0 0 1 minute read

The imagesetpixel() function is an inbuilt function in PHP which is used to draw a pixel at the specified coordinate.

Syntax:

bool imagesetpixel( resource $image, int $x, int $y, int $color )

Parameters: This function accept four parameters as mentioned above and described below:

$image: It specifies the image resource to work on.
$x: It specifies the x-coordinate of pixel.
$y: It specifies the y-coordinate of pixel.
$color: It specifies the color of pixel.

Return Value: This function returns TRUE on success or FALSE on failure.

Below given programs illustrate the imagesetpixel() function in PHP:

Program 1 (Drawing a line on a image):

php

<?php 
    
// Load the png image 
$image = imagecreatefrompng( 
'https://media.zambiatek.com/wp-content/uploads/zambiatek-13.png'); 
  
// Draw a line using imagesetpixel 
$red = imagecolorallocate($image, 255, 0, 0); 
for ($i = 0; $i < 1000; $i++) { 
    imagesetpixel($image, $i, 100, $red); 
} 
  
// Output image to the browser 
header('Content-type: image/png'); 
imagepng($image); 
?> 

Output:

Program 2 (Drawing a pattern):

php

<?php 
  
  // Create a blank image 700x200 
$image = imagecreatetruecolor(700, 200); 
  
$points = [ 
    array('x' => 00, 'y' => 10), 
    array('x' => 0, 'y' => 190), 
    array('x' => 800, 'y' => 190) 
]; 
  
// Prepare the color 
$green = imagecolorallocate($image, 0, 255, 0); 
  
// Draw the pattern 
$x = 700; 
$y = 200; 
for ($i = 0; $i < 100000; $i++) { 
    imagesetpixel($image, round($x), round($y), $green); 
    $a = rand(0, 2); 
    $x = ($x + $points[$a]['x']) / 2; 
    $y = ($y + $points[$a]['y']) / 2; 
} 
  
// Show the output in browser 
header('Content-Type: image/png'); 
imagepng($image); 
?> 