Requirement:
------------

You should have ImageMagick installed (http://www.imagemagick.org).



How to use css_sprite_generator.sh
----------------------------------

You should create an empty file. For this example, I create test.sprite.

Structure of this file:
    * The first line define the options for the generated files. You can use this possible parameters:
        image_target_name : the name (and the path if needed) of the generated sprite image
        css_target_name   : the name (and the path if needed) of the generated css file
        css_format        : the default css format. It can be overwrite on each image see below.
                            list of possible formats:
                                nor:  Default value, no repeat on the css background image
                                r  :  Add repeat on the css background image
                                rx :  Add repeat-x on the css background image
                                ry :  Add repeat-y on the css background image
                                now:  Default value, no css width on the element which has the image as background.
                                w  :  Add css width on the element which has the image as background. It's the image width.
                                noh:  Default value, no css height on the element which has the image as background.
                                h  :  Add css height on the element which has the image as background. It's the image height.

                            To combine the css_format separate them by a comma ',' like this css_format=r,w,h

        web_image_path    : the image path to use in the css. This path can be abslute like this: http://www.domain.com/images/

        Example of the syntax with all the parameters:
        /* image_target_name=output.png css_target_name=output.css css_format=r,w,h web_image_path=http://www.domain.com/images/ */


    * The other lines define the images and the css to apply:
    
        The syntax:
            default syntax: image_name:css_selector
            The script support for advanced sprite these options:
            image_name(image_widthximage_height):css_selector(css_format)
            
            image_name   : the image name (and the path if needed) of the image on the filesystem
            image_width  : if you want to force the width (the image will be centered horizontally) 
            image_height : if you want to force the height (the image will be centered vertically) 
            css_selector : the css selector like ".page #menu"
            css_format   : It is used to force the css format for this image. See css_format from the first line documentation.

            If you want to add many images on the same line, separated them by '|' in your file. See examples for details.

            Examples:
                # Add the image named image1.png to the sprite and force its height. The css corresponding is ".menu"
                image1.png(x400):.menu
                # Add 2 images on the same line. We force the size and we also add the size in the generated css file.
                image2.png(150x25):#menu a(w,h)|image3.png(150x25):#menu a:hover(w,h)

        
    Example of a file's content:
        /* image_target_name=output.png css_target_name=output.css css_format=r,w,h web_image_path=http://www.domain.com/images/ */
        image1.png(x400):.menu
        image2.png(150x25):#menu a(w,h)|image3.png(150x25):#menu a:hover(w,h)


    It will generate a sprire like this (the size is not correct):

        --------------
        |            |
        |            |
        |            |
        |            |
        | image1.png |
        |            |
        |            |
        |            |
        |            |
        ---------------------------
        |            |            |
        |            |            |
        |            |            |
        |            |            |
        | image2.png | image3.png |
        |            |            |
        |            |            |
        |            |            |
        |            |            |
        ---------------------------


    And the css file will look like:

        .menu{
          background: url(http://www.domain.com/images/output.png) 0px 0px repeat;
          width: 10px;
          height: 400px;
        }
        
        #menu a{
          background: url(http://www.domain.com/images/output.png) 0px -400px repeat;
          width: 150px;
          height: 25px;
        }
        
        #menu a:hover{
          background: url(http://www.domain.com/images/output.png) -150px -400px repeat;
          width: 150px;
          height: 25px;
        }