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When I first started working with stripboard circuits, I used a pencil (with a big eraser) and a sheet of graph paper This approach certainly works for simple circuits, but it does have one major drawback, which we were able to avoid when we constructed our mini-stereo jack adapter The vast majority of stripboard designs necessitate cutting the copper traces on the bottom of the board at various specific locations to correctly implement the design of the circuit Of course, when you are looking at the bottom of a stripboard, what you see is inverted 180 degrees from the top view For example, suppose you are looking at the top of the board and there s a trace that needs to be cut near the top-left corner of the board When you turn the board over, that cut will be near either the bottomleft corner or the top-right corner, depending on which way you turned the board an invitation to disaster, to say the least! My initial way of dealing with this problem was to hang my graph-paper layout in front of a bright light with the back of the paper facing me so that I could view the inverted image and cut the traces correctly It soon dawned on me that I could improve the situation by scanning my graph-paper layout, using a computer graphics program to flip the image, and then printing out the inverted image for use as I cut the traces If you don t have a scanner, I m sure you could do the same thing with a digital camera This approach certainly works for simple circuits, but it s tedious at best

Create a custom View subclass. Get a handle to an OpenGLContext, which provides access to Android s OpenGL ES functionality.

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In the View s onDraw() method, use the handle to the GL object and then use its methods to perform any GL functions.

Figure 12-4 Stripboard layout for four-digit LED display (version 1)

To allow the use of PHP s build-in eval() function, it is necessary to remove any harmful expressions before passing them to the function To achieve this, the array $f1 contains 22 function names (out of the hundreds supported by PHP) that are considered safe Using the $f2 array, which contains a matching set of tokens, any of the 22 functions found in the argument $expr are converted to a corresponding token This means that any remaining alphabetical characters may form other function names and therefore are stripped out The preceding is achieved by first converting the string $expr to lowercase using the function strtolower() and then employing str_replace() to replace all occurrences of the allowed function names with their tokens Next preg_replace() is called to strip out anything remaining that is not required, using the regular expression /[^\d\+\*\/\-\()! ]/ Okay, I know it looks like I just dropped the keyboard on the floor but this is actually a powerful expression which I ll now break up for you The outer / characters denote the start and end of a regular expression The square brackets, [], state that a match should be made against any single character enclosed within them The ^ symbol, when immediately following a [ symbol, forces negation, so that the expression will match anything that is not one of the characters following Next comes a sequence of characters, which are all escaped by prefacing them with a \ symbol, because otherwise they would be interpreted as special regular expression operators: \d Any digit (0 9) \+ An addition symbol \* A multiplication symbol \/ A division symbol \- A subtraction symbol \ A decimal point symbol So, if any symbol is not one of these escaped symbols, it will be considered a match and the second argument to preg_replace(), '', will replace it with nothing in other words, the symbol will be removed Finally, a few other symbols are also allowed through These are the left and right brackets, the comma, the exclamation mark, and a space You might wonder why the exclamation mark is allowed within a mathematical expression Well, the answer isn t that the exclamation mark is needed for use in expressions, because it isn t Instead, it s there because it forms part of each of the 22 tokens in the array $f2 Once the mathematical functions have been converted to tokens, the ! symbols remain there so that the tokens can be converted back again after stripping the remaining unwanted characters out, which is done using another call to the str_replace() function I chose the exclamation mark at random and could equally have used any one of many other symbols After all this processing, the resulting sanitized string is passed to the eval() function, the result of which is returned to the calling statement If you wish to see what the sanitized expression looks like, you can uncomment the line shown in the source code.

Following these basic steps, first we ll create a class that uses Android to create a blank surface to draw on. In section 9.3.2, we ll use OpenGL ES commands to draw a square and an animated cube on the surface. To start, open a new project called OpenGLSquare and create an Activity called OpenGLSquare, as shown in the following listing.

public class SquareActivity extends Activity { @Override public void onCreate(Bundle icicle) { super.onCreate(icicle); setContentView(new DrawingSurfaceView(this)); } class DrawingSurfaceView extends SurfaceView implements SurfaceHolder.Callback { public SurfaceHolder mHolder; public DrawingThread mThread;