.NET/Java PDF, Tiff, Barcode SDK Library

So, when the unit is falling, its velocity decreases until it reaches its minimum value For this example, you will skip the more complex inertial calculations that could provide a better illusion of real jumping, since the main aim here is to demonstrate the core principles at work and get you started coding in XNA While the unit is jumping, it moves faster than while it is walking In this case, the camera s chase velocity is not enough to chase a unit while it jumps To solve this problem, whenever a unit jumps, the camera s chase velocity is increased; when the unit reaches the ground, it is restored You can also increase the unit s speed while it jumps, allowing it to jump bigger distances.

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When forms are submitted, we usually want to make sure that their content makes sense in the context of the code that will process the form There are essentially two ways to validate a form: we can write browser-side JavaScript logic to check that the form has the correct values in it, or we can write server-side logic to check the contents of the request The JavaScript approach is pretty much optional It has the advantage of relieving the server of some of the burden of form submissions, and it is quick, but it presents no hard guarantees The user may have disabled JavaScript validation, and malicious or ingenious users may submit forms without using a browser implementation at all The server-side approach is therefore essential, and Spring allows us to carry out convenient validation in several places.

Following is the code for the Jump method: public void Jump(float jumpHeight) { if (isOnTerrain) { // Update camera chase speed and unit speed ThirdPersonCamera camera = cameraManagerActiveCamera as ThirdPersonCamera; cameraChaseSpeed *= 40f; speed *= 15f; adjustJumpChanges = true; // Set the gravity velocity gravityVelocity = (float)GRAVITY ACCELERATION * jumpHeight * 01f; isOnTerrain = false; } } Before the unit can jump, you need to check if it is positioned over the terrain, avoiding having the unit jump while it is in the air The Jump method receives a parameter that is the height value that you want the unit to jump Notice that after changing the camera s chase speed and unit speed, you set the adjustJumpChanges flag to true, reporting that these modifications need to be restored..

The first opportunity for validation is the binding of the incoming HTTP request data to the form bean s fields Generally, this will be carried out automatically; the default PropertyEditor classes will be used to convert incoming request data (by definition submitted as HTTP strings) into appropriate object values If a form field containing nonnumeric characters is submitted for a field that will be bound to an Integer form property, the error will be caught, and the form will be re-presented to the user The validation may also take place through custom logic in the controller Suitable versions of the onBind or onBindAndValidate methods (those providing a BindException parameter) can be overridden for custom error handling If the custom logic populates the provided BindException object with error information, the framework treats the form as invalid and re-presents the form to the user.

The units created based on the TerrainUnit class are units that move only over the game terrain. These units need to have their height updated every time you update their position to ensure that they remain on the terrain. When a unit moves to a new position, the terrain s height in

However, the validation usually takes place in either the onSubmit method s implementation body (again, a version accepting a BindException object is overridden) or in an external validator-implementing bean provided to the form Listing 6-12 shows the validator implementation The interface requires us to override only two methods The first allows the framework to determine whether the validator should be applied to the form bean in question The second carries out the validation logic..

this new position could be equal to, higher, or lower than the unit s previous height, as shown in Figure 13-4.

public class PeriodCreateValidator implements Validator { public boolean supports(final Class type) { return PeriodCreateForm.class.equals(type); } public void validate(final Object command, final Errors errors) { final PeriodCreateForm form = (PeriodCreateForm)command; if(form.getNote() == null || "".equals(form.getNote().trim())) { errors.rejectValue("note", "create.period.note"); }

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