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// Private members private $_mDepartmentId; private $_mCategoryId; And then comes the constructor. In any object-oriented language, the constructor of the class is executed when the class is instantiated, and the constructor is used to perform various initialization procedures. In our case, the constructor of Department reads the DepartmentID and CategoryID query string parameters into the _mDepartmentId and _mCategoryId private class members. You need these because if CategoryID actually exists in the query string, then you also need to display the name of the category and the category s description instead of the department s description. // Class constructor public function __construct() { // We need to have DepartmentID in the query string if (isset ($_GET['DepartmentID'])) $this->_mDepartmentId = (int)$_GET['DepartmentID']; else trigger_error('DepartmentID not set'); /* If CategoryID is in the query string we save it (casting it to integer to protect against invalid values) */ if (isset ($_GET['CategoryID'])) $this->_mCategoryId = (int)$_GET['CategoryID']; } The real functionality of the class is hidden inside the init() method, which in our case gets executed immediately after the constructor. This method populates the mNameLabel and mDescriptionLabel public members with information from the business tier. The GetDepartmentDetails method of the business tier Catalog class is used to retrieve the details of the department; if necessary, the GetCategoryDetails method is also called to retrieve the details of the category. (The details of the department need to be retrieved even if visiting a category because the page heading would be composed of both the department name and the category name.) public function init() { // If visiting a department ... $details = Catalog::GetDepartmentDetails($this->_mDepartmentId); $this->mNameLabel = $details['name']; $this->mDescriptionLabel = $details['description']; // If visiting a category ... if (isset ($this->_mCategoryId)) { $details = Catalog::GetCategoryDetails($this->_mCategoryId); $this->mNameLabel = $this->mNameLabel . ' » ' . $details['name']; $this->mDescriptionLabel = $details['description']; } }

descent to the ascent, but the value of the descent is unusually low in this example because it doesn t include glyphs like g , j , p , q , or y , which have a descent that exceeds 0.18. The word Foobar is magnified so you can see the descent caused by the rounding of the glyphs o , b , and a . In the same screenshot, you can see that the same String was added a couple of times more, at absolute positions relative to a grid of lines.

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Now that you know how to measure the length of a String, you can compute the (x,y) coordinates and use them to change the text matrix so that the text is right aligned or centered (listing 3.9). Fortunately, there s an easier way to achieve this. You can use the setTextAligned() method, which will act as a shorthand notation for two types of transformations: a translation and a rotation. You ve already seen the result in figure 3.7.

When the visitor selects a department, the categories that belong to that department must appear. For this, you ll implement a new Smarty template named categories_list. categories_list is very similar to the department_list componentized template. It consists of a template section used for looping over the array of categories data (category name and category ID). This template section will contain links to index.php, but this time their query string will also contain a CategoryID, showing that a category has been clicked, like this: http://localhost/hatshop/index.php DepartmentID=1&CategoryID=2 The steps in the following exercise are very much like the ones for the departments_list componentized template (created at the end of 3), so we ll move a bit more quickly this time.

Listing 3.9 FoobarFilmFestival.java (continued)

Caution If the fields or items used in the GetPivotData formula s arguments are removed from the pivot

canvas.beginText(); canvas.setFontAndSize(bf_helv, 12); canvas.showTextAligned(Element.ALIGN_LEFT, foobar, 400, 788, 0); canvas.showTextAligned(Element.ALIGN_RIGHT, foobar, 400, 752, 0); canvas.showTextAligned(Element.ALIGN_CENTER, foobar, 400, 716, 0); canvas.showTextAligned(Element.ALIGN_CENTER, foobar, 400, 680, 30); canvas.showTextAlignedKerned(Element.ALIGN_LEFT, foobar, 400, 644, 0); canvas.endText();

1. First, update hatshop.css by adding the following styles, which you ll use for displaying categories: #categories_box { border: 1px solid #ef8d0e; } #categories_box p { background: #ef8d0e; } 2. Create the Smarty template for the categories_list componentized template. Write the following lines in presentation/templates/categories_list.tpl: {* categories_list.tpl *} {load_categories_list assign="categories_list"} {* Start categories list *} <div class="left_box" id="categories_box"> <p>Choose a Category</p> <ol> {section name=i loop=$categories_list->mCategories} {assign var=selected_c value=""} {if ($categories_list->mCategorySelected == $categories_list->mCategories[i].category_id)} {assign var=selected_c value="class=\"selected\""} {/if} <li> <a {$selected_c} href="{$categories_list->mCategories[i].link|prepare_link:"http"}"> » {$categories_list->mCategories[i].name} </a> </li>

The text starts at position x = 400; the baseline y = 788. The text ends at position x = 400; the baseline y = 752. The text is centered at position x = 400, y = 716. The text is centered at position x = 400, y = 680, and rotated 30 degrees. The showTextAlignedKerned() method in listing 3.9 shows the same String, but it takes into account the kerning of the glyphs that were used.

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