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category_id; +---------------------------+----------------------+ | name | parent | +---------------------------+----------------------+ | All | Root Category | | Action Figures | All | | Sport Action Figures | Action Figures | | Tennis Action Figures | Sport Action Figures | | Football Action Figures | Sport Action Figures | | Historical Action Figures | Action Figures | | Video Games | All | | Racing Video Games | Video Games | | Sports Video Games | Video Games | | Shooting Video Games | Video Games |.

private void loadTextures() { earthTex = loadTexture("earth.jpg"); starsTex = loadTexture("stars.jpg"); treeTex = loadTexture("tree.gif"); robotTex = loadTexture("robot.gif");

The resulting color will have RGB values (1.0, 0.5, 0.0) an orange color. If we had a yellow color already on the screen (1.0, 1.0, 0.0) and we rendered a purple texture (1.0, 0.0, 1.0) with an alpha value of 0.5, the final color would be calculated as follows: Rednew Green new Blue new = (Redsource x Alpha) + Reddest = (Green source x Alpha) + Green dest = (Blue source x Alpha) + Blue dest = (1.0 x 0.5) + 1.0 = 1.5 = (0.0 x 0.5) + 1.0 = 1.0 = (1.0 x 0.5) + 0.0 = 0.5

| Sports Gear | All | | Soccer Equipment | Sports Gear | | Tennis Equipment | Sports Gear | | Dolls | All | +---------------------------+----------------------+ 14 rows in set (0.05 sec) As you can see, now all the categories are included. However, one question still remains: What if there are more than two levels to this category tree Currently, our category tree has only two levels: one root level and one subcategory level for some root-level categories. What if a subcategory had one or more child categories We will consider this situation in the next chapter, where we will discuss how to deal with hierarchical data using the nested set model.

The resulting color would be (1.0, 1.0, 0.5) as the red value would be clamped at 1.0. This is a pale yellow color. Because additive blending is adding two colors together, repeated rendering of the same area on the screen pushes the color toward full red, green, and blue intensity. If the colors being mixed contain elements of all three color components, the color will tend toward white.

// // // //

In some cases, you ll want to find the records in one data set that don t appear in a foreign key relationship. You can accomplish this task in a number of ways, but the most efficient method is to use an outer join. Consider the following request, again received from our illustrious sales department: We d like a list of all of the customers in our database who have signed up at our online store, but who have not ordered anything from our catalog. This kind of request typifies a situation where beginner developers often get into trouble and overcomplicate things. Novices will often approach this problem using a procedural method: get a list of all customer ID values, loop through the list of customer IDs, and for each one, check if the customer ID value is in the CustomerOrder table; if not, add the ID to a list of values to return. This kind of approach might result in something like the PHP code shown in Listing 7-8. Listing 7-8. Inefficient PHP Code to Find Customers Without Orders < php $conn = mysql_connect("localhost","test","") or die (mysql_error()); mysql_select_db("ToyStore", $conn) or die ("Can't use database 'ToyStore'"); $customers = mysql_query("SELECT customer_id, first_name, last_name FROM Customer"); $customers_without_orders = array(); if ($customers) { while ($customer = mysql_fetch_row($customers)) { $orders = mysql_query("SELECT COUNT(*) FROM CustomerOrder WHERE customer_id = " . $customer[0]); $order = mysql_fetch_row($orders); $has_orders = $order[0]; if ($has_orders) { array_push($customers_without_orders, $customer); } } } >

Earlier in this section, we explored the calculations required to automatically calculate the normals for a triangle within a 3D object. As a final lighting-related addition to the game framework, let s add a function that will calculate the normals automatically.

// repeat the skybox texture in every direction starsTex.setTexParameteri(GL.GL_TEXTURE_WRAP_S, GL.GL_REPEAT); starsTex.setTexParameteri(GL.GL_TEXTURE_WRAP_T, GL.GL_REPEAT); } // end of loadTextures()