To make our custom brush readable, we must force GD not to draw it in place of every pixel and then
use that style in conjunction with the brush by setting the color of the operation to the
IMG_COLOR_STYLEBRUSHED
<?php
define("WIDTH", 450);
define("HEIGHT", 450);
define("B_WIDTH", 20);
define("B_HEIGHT",20);
$img = imagecreate(WIDTH, HEIGHT);
$background = $white = imagecolorallocate($img, 0xFF, 0xFF, 0xFF);
$black = imagecolorallocate($img, 0, 0, 0);
$brush = imagecreate(B_WIDTH, B_HEIGHT);
$b_bkgr = $b_white = imagecolorallocate($brush, 0xFF, 0xFF, 0xFF);
$b_black = imagecolorallocate($brush, 0, 0, 0);
imagecolortransparent($brush, $b_bkgr);
imageellipse($brush, B_WIDTH/2, B_HEIGHT/2, B_WIDTH/2, B_HEIGHT/2, $black);
imagerectangle($img, 0, 0, WIDTH-1, HEIGHT-1, $black);
imagesetbrush($img, $brush);
$style_a = array_fill(0, B_WIDTH/2, 0);
$style_a[] = 1;
imagesetstyle($img, $style_a);
imageline($img, 0, 50, WIDTH-1, 50, IMG_COLOR_STYLEDBRUSHED);
$style_b = array_fill(0, B_WIDTH/4, 0);
$style_b[] = 1;
imagesetstyle($img, $style_b);
imageline($img, 0, 100, WIDTH-1, 100, IMG_COLOR_STYLEDBRUSHED);
$style_c = array_fill(0, B_WIDTH/8, 0);
$style_c[] = 1;
imagesetstyle($img, $style_c);
imageline($img, 0, 150, WIDTH-1, 150, IMG_COLOR_STYLEDBRUSHED);
header("Content-Type: image/png");
imagepng($img);
?>
