Prerender: Let search engines crawl your JS apps

Prerender Service

This is a node server that uses phantomjs to render a javascript-rendered page as HTML. It should be used in conjunction with prerender_rails or prerender-node middleware to serve the rendered HTML to crawlers for SEO. You don't have to run this service on your own since I have it deployed on Heroku already. Get started in two lines of code using Rails or Node

It is also meant to be proxied through your server so that any relative links to things like CSS will work.

It is currently deployed at http://prerender.herokuapp.com, or you can deploy your own.

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http://www.daftlogic.com/projects-text-to-image.htm

PHP Text to Image

Change the settings and the click Create

Text		The text to display
Rotation		0=normal 90=sideways
Font Size	8 12 18 24 32 48 64	Points
Font	Arial Times New Roman Tahoma Grand Stylus
Padding		Space around the image
Transparent
Fore Colour	R G B	(0-255)
Back Colour	R G B	(0-255)
(pop-up window)

Description

This script is a means to convert a string of text into an image. This has some simple uses such as displaying text such as email address that cannot be programmatically found. This can help to reduce the possibility of your email address being picked up by web crawlers and used for junk mail.

How To Use

To use the example interface above, simply modify or insert the string of text. You can edit any of the other settings, but this is optional.

Further Uses and Ideas:

How it Works:

The PHP Script

<? /* text to image converter daftlogic www.daftlogic.com */ Header("Content-type: image/png"); class textPNG { var $font = 'fonts/TIMES.TTF'; //default font. directory relative to script directory. var $msg = "no text"; // default text to display. var $size = 24; // default font size. var $rot = 0; // rotation in degrees. var $pad = 0; // padding. var $transparent = 1; // transparency set to on. var $red = 0; // black text... var $grn = 0; var $blu = 0; var $bg_red = 255; // on white background. var $bg_grn = 255; var $bg_blu = 255; function draw() { $width = 0; $height = 0; $offset_x = 0; $offset_y = 0; $bounds = array(); $image = ""; // get the font height. $bounds = ImageTTFBBox($this->size, $this->rot, $this->font, "W"); if ($this->rot < 0) { $font_height = abs($bounds[7]-$bounds[1]); } else if ($this->rot > 0) { $font_height = abs($bounds[1]-$bounds[7]); } else { $font_height = abs($bounds[7]-$bounds[1]); } // determine bounding box. $bounds = ImageTTFBBox($this->size, $this->rot, $this->font, $this->msg); if ($this->rot < 0) { $width = abs($bounds[4]-$bounds[0]); $height = abs($bounds[3]-$bounds[7]); $offset_y = $font_height; $offset_x = 0; } else if ($this->rot > 0) { $width = abs($bounds[2]-$bounds[6]); $height = abs($bounds[1]-$bounds[5]); $offset_y = abs($bounds[7]-$bounds[5])+$font_height; $offset_x = abs($bounds[0]-$bounds[6]); } else { $width = abs($bounds[4]-$bounds[6]); $height = abs($bounds[7]-$bounds[1]); $offset_y = $font_height;; $offset_x = 0; } $image = imagecreate($width+($this->pad*2)+1,$height+($this->pad*2)+1); $background = ImageColorAllocate($image, $this->bg_red, $this->bg_grn, $this->bg_blu); $foreground = ImageColorAllocate($image, $this->red, $this->grn, $this->blu); if ($this->transparent) ImageColorTransparent($image, $background); ImageInterlace($image, false); // render the image ImageTTFText($image, $this->size, $this->rot, $offset_x+$this->pad, $offset_y+$this->pad, $foreground, $this->font, $this->msg); // output PNG object. imagePNG($image); } } $text = new textPNG; if (isset($msg)) $text->msg = $msg; // text to display if (isset($font)) $text->font = $font; // font to use (include directory if needed). if (isset($size)) $text->size = $size; // size in points if (isset($rot)) $text->rot = $rot; // rotation if (isset($pad)) $text->pad = $pad; // padding in pixels around text. if (isset($red)) $text->red = $red; // text color if (isset($grn)) $text->grn = $grn; // .. if (isset($blu)) $text->blu = $blu; // .. if (isset($bg_red)) $text->bg_red = $bg_red; // background color. if (isset($bg_grn)) $text->bg_grn = $bg_grn; // .. if (isset($bg_blu)) $text->bg_blu = $bg_blu; // .. if (isset($tr)) $text->transparent = $tr; // transparency flag (boolean). $text->draw(); // GO!!!!! ?>

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Further Help

For anyone finding problems using this...

(1) Please test this example to ensure imagecreate works on your server...

(2) Make sure to use the example at the top of this page by sending POST variables from your form. For example msg,font,size ...

Relevant Links

• PHP Manual - http://uk2.php.net/imagepng
• http://uk3.php.net/imagecreate

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