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Table 12-1. Drawing Methods of the Graphics Class (Continued)

DrawRectangle() and DrawRectangles() DrawString() DrawPath() FillClosedCurve() FillEllipse() FillPie() FillPolygon() FillRectangle() and FillRectangles() DrawPath()

Draws sone or more ordinary rectangles. Each rectangle is defined by a starting coordinate pair, a width, and a height. Draws a string of text in a given font. Draws a more complex shape that s defined by the Path object. Draws a curve, closes it off by connecting the end points, and fills it. Fills the interior of an ellipse. Fills the interior of a piece of pie shape. Fills the interior of a polygon. Fills the interior of one or more rectangles. Fills the interior of a complex shape that s defined by the Path object.

approach to explaining the helpers and their functions. Each function will have its own set of parameters that are called by populating the parameter in the view. Each parameter is separated from the previous one by a comma and includes in brackets the type of data specified in the parameter. Beneath each description, I include each parameter s default value. Leaving the parameter blank, or entering null in its place, means that the default value for that parameter will be used when the function is executed.

When calling the Graphics class methods, you need to specify several parameters to indicate the pixel coordinates for what you want to draw. For example, when drawing a rectangle, you need to specify the location of the top-left corner and its width and height. Here s an example of how you might draw a solid rectangle in yellow: ' Draw a rectangle starting at location (0, 0) ' that is 300 pixels wide and 50 pixels high. g.FillRectangle(Brushes.Yellow, 0, 0, 300, 50) When measuring pixels, the point (0, 0) is the top-left corner of your image in (x, y) coordinates. The x coordinate increases as you go farther to the right, and the y coordinate increases as you go farther down. In the current example, the image is 300 pixels wide and 50 pixels high, which means the point (299, 49) is the bottom-right corner.

Note This code performs its drawing on the in-memory Bitmap object created earlier. Until this image is

Now that you understand data tables terminology, you will learn how to work with one-variable and two-variable data tables.

This chapter could get very boring very fast. Listing all the possible helper functions would make for a very long list indeed and would turn this chapter, more or less, into API documentation. (If API documentation is what you want, then by all means check out Cake s online API at http://api.cakephp.org. It s kept up-to-date and contains resource links to the source code itself for each function.) I will explain the functions in detail rather than reprinting the API documentation. The fact remains that some helpers are used so frequently that, for most developers, leaving out a detailed survey of Cake s built-in helper functions would hinder your progress in really using what Cake has to offer. Therefore, I will only highlight the HTML and Form helpers in detail, since these are fundamentally necessary for anything to happen in even the most basic Cake application. Don t be afraid to try these functions on your own; most of the time, they re rather straightforward, and since they don t manipulate your database, you can t inflict any permanent damage on your application. Usually the more helpers you use, the more time you save, so it s worth practicing. A common pitfall for inexperienced Cake developers is to be unaware of helper functions so they resort to building their own processes or custom helpers to perform tasks that have already been standardized in a helper function. (I have certainly been guilty of this I once wrote an entire console script to automate building views before I realized that Cake already came with Bake!)