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// And finally drive backwards for a bit arthurTheTurtle.RightMotorState = MotorState.Reversed; arthurTheTurtle.LeftMotorState = MotorState.Reversed; arthurTheTurtle.RunFor(Math.Cos(Math.PI / 4.0)); ShowPosition(arthurTheTurtle); Console.ReadKey(); } private static void ShowPosition(Turtle arthurTheTurtle) { Console.WriteLine( "Arthur is at ({0}) and is pointing at angle {1:0.00} radians.", arthurTheTurtle.CurrentPosition, arthurTheTurtle.CurrentOrientation); }

We chose the times for which to run quite carefully so that we end up going through relatively readable distances and angles. (Hey, someone could design a more usable facade over this API!) If we compile and run, we see the following output:

Arthur Arthur Arthur Arthur Arthur Arthur is is is is is is at at at at at at (0,0) and is pointing at angle 0.00 radians. (0,10) and is pointing at angle 0.00 radians. (0,10) and is pointing at angle 1.57 radians. (-25,10) and is pointing at angle 1.57 radians. (-25,10) and is pointing at angle 0.79 radians. (-27.5,7.5) and is pointing at angle 0.79 radians.

OK, that seems fine for basic operation. But what happens if we change the width of the platform to zero

Turtle arthurTheTurtle = new Turtle { PlatformWidth = 0.0, PlatformHeight = 10.0, MotorSpeed = 5.0 };

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Figure 15-2. Preinstalled thawte CA certificate in Firefox A principal such as Alice can approach a CA to obtain a certificate attesting to the binding between her identity and her public key. Alice can construct the following certificate text and authenticates herself to the CA using some out-of-band mechanism (such as showing the CA her driver s license):

Not only does that not make much sense, but the output is not very useful either; clearly we have divide-by-zero problems:

Arthur Arthur Arthur Arthur Arthur Arthur is is is is is is at at at at at at (0,0) and is pointing at angle 0.00 radians. (0,10) and is pointing at angle 0.00 radians. (0,10) and is pointing at angle Infinity radians. (NaN,NaN) and is pointing at angle Infinity radians. (NaN,NaN) and is pointing at angle NaN radians. (NaN,NaN) and is pointing at angle NaN radians.

Clearly, our real-world turtle could go badly wrong if we told it to rotate through an infinite angle. At the very least, we d get bored waiting for it to finish. We should prevent the user from running it if the PlatformWidth is less than or equal to zero. Previously, we used the following code:

// Run the turtle for the specified duration public void RunFor(double duration) {

start: Set this to a number larger than 0, and you ll get the 20 (start+20) freshest items (links or blogs); set it to 20+1, and you ll get the second page of rankings, that is, items 21 40. limit: Set this to a number larger than 0 and smaller or equal to 100, and it will return limit number of links for a query. By default, this value is 20. claim: Set this to 1 to have each link result embellished with any user information associated with a link result s parent blog. Examining the operation, we see that two parameters must be included with every call: query, which represents the keywords you are searching on, and Key, which is the Technorati API key. The Technorati key is generated for each individual user of the service, to prevent abuse, and you are limited to 500 API calls a day. This limit prevents someone from opening up their own site and using the Technorati s APIs as a back end, which would be like opening a restaurant and ordering takeout from another restaurant for your customers. And if you think back to when you were creating your own mashups, some blocks required keys to use for exactly the same reason. To get your key, click the API Key tab in the Technorati Development Center. Follow the instructions until you are presented with your API key (see Figure 9-6). Make note of your API key; you will need it as we start building your block in VWD.

Once Alice is authenticated by the CA, the CA signs Alice s certificate with the CA s secret key:

if (PlatformWidth <= 0.0) { // What to do here } } // ...

That detects the problem, but what should we do if our particular turtle is not set up correctly Previously, we silently ignored the problem, and returned as though everything was just fine. Is that really what we want to do For this application it might be perfectly safe, but what if another developer uses our turtle with a paintbrush strapped to its back, to paint the lines on a tennis court The developer added a few extra moves at the beginning of his sequence, and he didn t notice that he had inadvertently done so before he initialized the PlatformWidth. We could have a squiggly paint disaster on our hands!

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