Using imagearc() to Draw Spirals : imagearc « Graphics Image « PHP

1. PHP
2. Graphics Image
3. imagearc

Using imagearc() to Draw Spirals

 
<?php

    define("WIDTH", 400);
    define("HEIGHT", 400);

    $img = imagecreate(WIDTH, HEIGHT);

    $bg = $white = imagecolorallocate($img, 0xFF, 0xFF, 0xFF);
    $black = imagecolorallocate($img, 0, 0, 0);

    imagerectangle($img, 0, 0, WIDTH-1, HEIGHT-1, $black);

    $center_x = (int)WIDTH/2;
    $center_y = (int)HEIGHT/2;

    $angle = 0;
    $radius = 0;
    while($radius <= WIDTH ) {
        imagearc($img, $center_x, $center_y, $radius,
                 $radius, $angle-5, $angle, $black);
        $angle += 5;
        $radius++;
    }

    header("Content-Type: image/png");
    imagepng($img);

?>
  
  

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