Posts Tagged php

Shell without ssh or root on your shared hosting

My site jcubic.pl is on shared hosting that don’t have ssh, and I wanted to have a shell access, so using my jQuery Terminal, I’ve stared a project leash. It’s a shell written in javascript with help from php and python cgi. It will give you a shell access, no need to install any new software, and you don’t need to be root (like with other shells like shell in a box, AjaxTerm or Buterfly).

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Image color picker in javascript that work without canvas in every browser

If you want to create color picker from image in javascript you probably will use canvas, but what if you need it work in IE as I needed. You can use some server side help to fetch pixels data from the server. I use php for that and GD library. The code is below.

cross-browser color picker

Server side code that return json pixel data

<?php

function rgb($color) {
    $result[] = ($color >> 16) & 0xFF;
    $result[] = ($color >> 8) & 0xFF;
    $result[] = $color & 0xFF;
    return $result;
}

function imagecreatefrom($filename) {
    $path = pathinfo($filename);
    switch($path['extension']) {
        case 'png':
            return imagecreatefrompng($filename);
        case 'jpg':
            return imagecreatefromjpeg($filename);
        case 'gif':
            return imagecreatefromgif($filename);
        default:
            return null;
    }
}

function getImageData($filename) {
    list($width, $height) = getimagesize($filename);
    $image = imagecreatefrom($filename);
    $image_data = array();
    for ($y = 0; $y < $height; ++$y) {
        $row = array();
        for ($x = 0; $x < $width; ++$x) {
            $row[] = rgb(imagecolorat($image, $x, $y));
        }
        $image_data[] = $row;
    }
    return $image_data;
}

if (isset($_GET['filename'])) {
    $filename = $_GET['filename'];
    if (file_exists($filename)) {
        $result = array(
            'error' => null,
            'result' => getImageData($filename)
        );
    } else {
        $result = array(
            'error' => "The file '$filename' don't exist",
            'result' => null
        );
    }
} else {
    $result = array(
        'error' => "You need to put filename",
        'result' => null
    );
}
header('Content-Type: application/json');
echo json_encode($result);

?>

Then you can fetch the data using ajax and add get invidial pixels on mousemove

    var img = $('img');
    $.getJSON('image_data.php', {filename: img.attr('src')}, function(data) {
        if (data.error) {
            alert(data.error);
        } else {
            $('.eyedropper').click(function() {
                picker = true;
                return false;
            });
            img.mousemove(function(e) {
                if (picker) {
                    var x = Math.round(e.pageX - offset.left);
                    var y = Math.round(e.pageY - offset.top);
                    if (x >= 0) {
                        $('.color').css('background-color',
                                        'rgb('+data.result[y][x].join(',')+')');
                    }
                }
            }).click(function(e) {
                picker = false;
            });
        }
    });

Now all you need to have is element with class eyedropper like a link in your html:


<a href="#" class="eyedropper">pick the color</a>

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