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The ValidationResult class represents specific results returned by a Validator instance. The ValidationResult class diagram is shown in Figure 12-2.

Figure 3-23. Use the collision vector to move the circles out of the collision. Now that we ve moved the circles out of the collision, we need to calculate their bounce vectors. When the circles collide, they transfer their motion vectors to each other.

First, we need to calculate the circles motion vectors and project them onto v0 and v0 s normal. //_c1's motion vector var v1:VectorModel = new VectorModel ( _c1.xPos, _c1.yPos, _c1.xPos + _c1.vx, _c1.yPos + _c1.vy ); //_c2's motion vector var v2:VectorModel = new VectorModel ( _c2.xPos, _c2.yPos, _c2.xPos + _c2.vx, _c2.yPos + _c2.vy ); //Project v1 onto v0 and v0.ln var p1a:VectorModel = VectorMath.project(v1, v0); var p1b:VectorModel = VectorMath.project(v1, v0.ln); //Project v2 onto v0 and v0.ln var p2a:VectorModel = VectorMath.project(v2, v0); var p2b:VectorModel = VectorMath.project(v2, v0.ln); This is the first step in calculating any bounce vector, so it should be pretty familiar to you by now. Now here s the freaky part. Both circles must transfer their velocities to each other, but also bounce away at the correct angle. To do this, mix and match the projections. //Bounce c1 //using p1b and p2a _c1.vx = p1b.vx + p2a.vx; _c1.vy = p1b.vy + p2a.vy; //Bounce c2 //using p1a and p2b _c2.vx = p1a.vx + p2b.vx; _c2.vy = p1a.vy + p2b.vy; Each circle s velocity is a combination of its projections plus the other circle s projections. Dr. Frankenstein would be proud! It s a difficult thing to visualize, but as you can see, the code is quite straightforward and symmetrical. This gives you a perfectly natural collision reaction that you can use in any game where two circles collide.

Figure 12-2. ValidationResult class diagram When a Validator instance determines that a rule is violated, a new instance of ValidationResult is created and added to the ValidationResults collection. The parameters

The Infinite Data pattern implementation in this chapter will be a simple example of calculating all prime numbers up to a specified value. So if the specified value were 9, all the prime numbers up to the number 9 would be 2, 3, 5, and 7. This simple algorithm is useful because it allows us

It might make sense to make the large circle heavier than the smaller one, so that its bounce is in proportion to its size. You can do this by giving it some mass. Just divide the bounce vector by any number larger than 1, and the bounce effect will be dampened accordingly

of the ValidationResult constructor are the message to be logged or shown to a user, the object that was tested, a key that shows the location of the validation result within a collection, a tag value that describes the validation result (usually used for filtering or categorizing ValidationResult objects), and the validator object itself. As shown in Figure 12-2, the ValidationResult object also contains five read-only properties for getting the values that were passed into the constructor.

var mass:uint = 5; _c2.vx = (p1a.vx + p2b.vx) / mass; _c2.vy = (p1a.vy + p2b.vy) / mass;

to focus on the architecture and mechanics of the Infinite Data pattern For those wondering, the prime number calculation routine is a brute force technique that tests whether a number is prime What is desired with the implementation is the ability to display seemingly infinite data in a timely manner, hence the prime number algorithm is a secondary concern Calculating the prime number of a large enough maximum value will require some time and allow the testing of multiple concurrently running tasks The pattern implementation uses the Persistent Communications pattern In the definition of the Persistent Communications pattern, there are three variations that can be implemented The Infinite Data pattern uses the server push variation without implementing user identification A server push is when the client sends a request to a generic URL, and the server responds with a specific URL used to process requests.

The ValidationResults class provides a collection of validation results that were processed during the validation of an object. If validation results were returned, then one or more rules were broken during the validation process. Figure 12-3 shows the ValidationResults class diagram.