.NET/Java PDF, Tiff, Barcode SDK Library

<aop:config> <aop:pointcut .../> ... <aop:aspect .../> ... </aop:config> Pointcut definitions can be shared between multiple aspects, or can be declared as an attribute of the aspect definition itself. Typically, a pointcut is defined by using a wildcard. In Listing 5-18 we are specifying method names beginning with list and having any return value in the com.apress.timesheets.service package, where the class name begins with TimesheetService and the method may take zero or more parameters (note the use of the double-period syntax to indicate this last requirement). The and args(account) part of the declaration names the first parameter. This name is then used by the aspect to identify which parameter of the service method should be mapped to the parameter of the aspect method.

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// Get the height of the four vertices of the grid block int vertexIndex = (int)blockPosition.X + (int)blockPosition.Y * vertexCountX; float height1 = heightmap[vertexIndex + 1]; float height2 = heightmap[vertexIndex]; float height3 = heightmap[vertexIndex + vertexCountX + 1]; float height4 = heightmap[vertexIndex + vertexCountX]; // Top triangle float heightIncX, heightIncY; if (blockOffset.X > blockOffset.Y) { heightIncX = height1 - height2; heightIncY = height3 - height1; } // Bottom triangle else { heightIncX = height3 - height4; heightIncY = height4 - height2; } // Linear interpolation to find the height inside the triangle float lerpHeight = height2 + heightIncX * blockOffset.X + heightIncY * blockOffset.Y; height = lerpHeight * heightScale; } return height; } Notice that you use this method only to ensure that all scene objects are positioned over the terrain. To produce a realistic interaction between the objects and the terrain (such as bouncing), you would need to implement a physics system.

<aop:pointcut id="listTimesheets" expression="execution(* com.apress.timesheets.service.TimesheetService*.list*(..)) and args(account)" /> Having declared the pointcut that our aspect will use to identify the service s listTimesheet method, we then declare the relationship between the aspect method and the pointcut by using the aop:aspect element (referencing the aspect implementation bean) and its component elements. In Listing 5-19 we use the aop:before element to indicate that the aspect implementation method must be invoked before the call to the service method. We also supply the name of the aspect implementation method as the parameter to the method attribute, the name of the arguments to be provided to the aspect (the name defined in the pointcut of Listing 5-18) as the parameter to the arg-names attribute, and we reference the pointcut to be used as the parameter to the pointcut-ref attribute. The pointcut declaration intercepting the findTimesheet method, shown in Listing 5-19, is specified similarly to that for the listTimesheets method but omits the parameter names because we are concerned only with the (unnamed) return value of the method.

To detect when an object in the scene intersects a part of the terrain, you need to create some collision test methods. One useful collision test is between a ray and the terrain. For example, if an object is moving in the scene, you can trace a ray in the direction in which this object is moving and get the distance between it and the terrain. To check the ray and terrain collision, you ll do a collision test between the ray and the terrain s height map, instead of testing the ray against the terrain s mesh (many triangles). The

<aop:aspect ref="securityAdvice"> <aop:before method="list" arg-names="account" pointcut-ref="listTimesheets"/> ... </aop:aspect> Similarly, we relate the pointcut describing the service layer s findTimesheet method to its aspect implementation in Listing 5-20.

collision test will be divided in two parts. In the first part, you ll do a linear search on the ray until you find a point outside (above) and another inside (below) the terrain. Then you ll perform a binary search between these two points to find the exact collision point with the terrain. Figure 11-13 illustrates the linear search processes, where the nearest points outside and inside the terrain are found.

<aop:pointcut id="findTimesheet" expression= "execution(* com.apress.timesheets.service.TimesheetService*.findTimesheet(..))"/> In Listing 5-21 we use the aop:after-returning element to indicate that the service method should be invoked and only then will the aspect implementation be invoked. The method name is specified as before, but we also specify the parameter name corresponding to the value returned from the service method by using the returning attribute. The aspect is associated with its pointcut as before, by using the pointcut-ref attribute.