How to set a single pixel using imagesetpixel() function in PHP?

PHPServer Side ProgrammingProgramming

imagesetpixel() is an inbuilt function in PHP that is used to set a single pixel at the listed coordinate.

Syntax

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

Parameters

imagesetpixel() accepts four parameters: $image, $x, $y and $color.

  • $image − Specifies the image resource to work on.

  • $x − Specifies the x-coordinate of the pixel.

  • $y − Specifies the y-coordinate of the pixel.

  • $color − Specifies the color of the pixel.

Return Values −

imagesetpixel() returns True on success and False on failure.

Example 1

<?php
   // Load the png image using imagecreatefromjpeg() function
   $img = imagecreatefromjpeg('C:\xampp\htdocs\test\29.jpg');

   // Draw the line using imagesetpixel() function
   $blue = imagecolorallocate($img, 255, 255, 0);
   for ($i = 0; $i < 1000; $i++) {
      imagesetpixel($img, $i, 100, $blue);
   }
   // Show the output image to the browser
   header('Content-type: image/png');
   imagepng($img);
?>

Output

Example 2

<?php
   $x = 700;
   $y = 300;
   $gd = imagecreatetruecolor($x, $y);
   $corners[0] = array('x' => 100, 'y' => 10);
   $corners[1] = array('x' => 0, 'y' => 170);
   $corners[2] = array('x' => 190, 'y' => 170);
   $blue = imagecolorallocate($gd, 255, 0, 0);
   for ($i = 0; $i < 100000; $i++) {
      imagesetpixel($gd, round($x),round($y), $blue);
      $a = rand(0, 2);
      $x = ($x + $corners[$a]['x']) / 2;
      $y = ($y + $corners[$a]['y']) / 2;
   }
   header('Content-Type: image/png');
   imagepng($gd);
?>

Output

raja
Published on 09-Aug-2021 13:29:42
Advertisements