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You ll also notice that you need to specify either a Brush or a Pen object when you draw most content. (Both of these classes are defined in the System.Drawing namespace, alongside the Graphics class.) Methods that draw shape outlines require a Pen, while methods that draw filled-in shapes require a Brush. You can create your own custom Pen and Brush objects, but .NET provides an easier solution with the Brushes and Pens classes. These classes expose shared properties that provide various Brushes and Pens for different colors. For example, Brushes.Yellow returns a Brush object that fills shapes using a solid yellow color.

Once the image is complete, you can send it to the browser using the Image.Save() method. Conceptually, you save the image to the browser s response stream. It then gets sent to the client and displayed in the browser. ' Render the image to the HTML output stream. image.Save(Response.OutputStream, _ System.Drawing.Imaging.ImageFormat.Gif)

This technique allows you to save dynamically generated images to disk so you can use them later in other web pages.

Let s move on to the HTML and Form helpers. You should already be acquainted with them since you have used them previously; but they do offer more features than those mentioned so far.

Finally, you should explicitly release your image and graphics context when you re finished, because both hold onto some unmanaged resources that might not be released right away if you don t: g.Dispose() image.Dispose() Using GDI+ is a specialized technique, and its more advanced features are beyond the scope of this book. However, you can learn a lot by considering a couple of straightforward examples.

Using the techniques you ve learned, it s easy to create a simple web page that uses GDI+. The next example uses GDI+ to render some text in a bordered rectangle with a happy-face graphic next to it. Here s the code you ll need: Protected Sub Page_Load(ByVal sender As Object, _ ByVal e As System.EventArgs) Handles Me.Load ' Create an in-memory bitmap where you will draw the image. ' The Bitmap is 300 pixels wide and 50 pixels high. Dim image As New Bitmap(300, 50) ' Get the graphics context for the bitmap. Dim g As Graphics = Graphics.FromImage(image) ' Draw a solid yellow rectangle with a red border. g.FillRectangle(Brushes.LightYellow, 0, 0, 300, 50) g.DrawRectangle(Pens.Red, 0, 0, 299, 49)

You must organize the data on your worksheets in a certain way in order for Excel to properly create data tables. You design one-variable data tables so that input values are listed either down a column or across a row. A formula used in a one-variable data table must refer to a single input cell.

Table 2-3. Useful String Members*

You have already used the HTML helper, and this is perhaps the easiest one to master. Using the HTML helper provides some advantages: Often the amount of HTML markup you must enter in the view is reduced by sticking to the helper. HTML output can be managed dynamically rather than manually by passing along variables to the helper. You won t have to write your own methods for common tasks that are already available through the HTML helper. Have I overstated the advantage of managing links I ll say it again: this helper saves you the migraine headache of sifting through and testing all the possible broken links should you change a domain name, change a URL scheme, or move to a different hosting provider. This cannot be overstated especially since one of the biggest challenges for new web developers is making their applications portable. For some users, reading through PHP is easier than reading HTML. At the very least, those who favor PHP s syntax to HTML markup will find the HTML helper a better method for coding the views. The HTML helper is called in the view by using the $html object. This helper is one of two that is automatically included in the whole Cake application without having to use the var $helpers array in the controller. However, once you add more helpers to the application, it s not a bad idea to spell out the HTML helper in the var $helpers array; this way, no matter what future version of Cake the application may run on, the helper will be called appropriately. A more verbose $helpers property also ensures that other developers involved on the project know precisely which helpers are at work in the view.

Length ToUpper() and ToLower() Trim(), TrimEnd(), and TrimStart() PadLeft() and PadRight() Insert()