Thursday, 19 February 2015

PHP code to draw tan function on an image


In this article you will learn about tan function. How to draw tan function on an image with PHP code. Mostly these functions are used in mathematics, computer pixels and Numerical Computation. Watch complete code with example below and run on any server to watch results this tangent function.

<?php
$x = 600;
$y = 315;
$gd = imagecreatetruecolor($x, $y);   //create background image
$red = imagecolorallocate($gd, 255, 255, 255);   //create image
for ($i = 0; $i < 600; $i++) {
    imagesetpixel($gd, 300, $i, $red);  //draw vertical line
    imagesetpixel($gd, $i, 157, $red);  //draw horizontal line
}
$x = 0;
for($i = 90; $i <= 360; $i+=3)
{
     $y =  157 + (50*tan($i));   //get y-axis with farmula
     imagesetpixel($gd, $x+300, $y, $red);  //draw elips
     $x++;
}
header('Content-Type: image/png');
imagepng($gd);
?>
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