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When we scale an object, the transformation once again has an effect on the world coordinate system. If we scale an object so that its size doubles, a movement of one unit in the x axis in the transformed world coordinate system will correspond to a movement of two units relative to the identity coordinate system. If you simply want to draw an object at a different size but without affecting its position, remember to perform the scale transformation after all the translations have been completed to avoid affecting the movement distances.

GamePadController() obtains a list of controllers, then searches through it for the gamepad. If a controller is found, its components are searched to find the indices of the sticks axes, the POV hat, the buttons, and a rumbler: // globals private Controller controller; // for the gamepad

They create the framework on which your ability to identify problems and compare various solutions depends Any reader who has been on a team scrambling to figure out why a certain application or web page is not performing correctly understands just how painful not having this framework in place can be Yes, setting up a framework for benchmarking your applications takes time and effort It s not something that just happens by flipping a switch Likewise, effectively profiling an application requires the developer and administrator to take a proactive stance Waiting for an application to experience problems is not professional, but, alas, is usually the status quo, even for large applications Above all, we want you to take from this chapter not only knowledge of how to establish benchmarks and a profiling system, but also a true understanding of the importance of each.

So we know that multiple transformations can be combined by multiplying them together, so let s see some sample code to achieve this in XNA The first transformation that we want to use can be obtained directly by calling the appropriate static Matrix function From that point on, subsequent transformations must be obtained and multiplied by the existing calculated matrix To translate an object two units along the y axis and then rotate it by a specified angle, we would use the code shown in Listing 6 14 It causes the object to rotate on the spot a short distance away from the center of the screen Listing 6 14 Multiple transformations: translation and then rotation // First translate.. _effectWorld = MatrixCreateTranslation(0, 2, 0); // ..then rotate _effectWorld = MatrixCreateRotationZ(_angle) * _effect.

public GamePadController() { // get the controllers ControllerEnvironment ce = ControllerEnvironment.getDefaultEnvironment(); Controller[] cs = ce.getControllers(); if (cs.length == 0) { System.out.println("No controllers found"); System.exit(0); } else System.out.println("Num. controllers: " + cs.length);

In this chapter, we don t assume you have any knowledge of these topics Why Well, one reason is that most novice and intermediate books on MySQL don t cover them Another reason is that the vast majority of programmers and administrators we ve met over the years (including ourselves at various points) have resorted to the old trial-and-error method of identifying bottlenecks and comparing changes to application code..

World; Notice the order of multiplication: the new transformation is on the left of the multiplication symbol, and the existing matrix is on the right Unlike multiplication of simple numbers, matrix multiplication is not commutative, which is why the order of transformations is significant If we multiply matrix A by matrix B, we will get results different from multiplying matrix B by matrix A We can swap the order of these transformations so that we first rotate and then translate along the (rotated) y axis, as shown in Listing 6 15 Listing 6 15 Multiple transformations: rotation and then translation // First rotate.. _effectWorld = MatrixCreateRotationZ(_angle); // ..then rotate _effectWorld = MatrixCreateTranslation(0, 2, 0) * _effectWorld; Even though we are generating the same matrices with the same parameter, the resulting behavior is different.

// get the gamepad controller controller = findGamePad(cs); System.out.println("Game controller: " + controller.getName() + ", " + controller.getType()); // collect indices for the required gamepad components findCompIndices(controller); findRumblers(controller); } // end of GamePadController() findGamePad() loops through the controllers array looking for a gamepad: private Controller findGamePad(Controller[] cs) { Controller.Type type; int index = 0; while(index < cs.length) { type = cs[index].getType(); if ((type == Controller.Type.GAMEPAD) || (type == Controller.Type.STICK)) break; index++; } if (index == cs.length) { System.out.println("No game pad found"); System.exit(0); } else System.out.println("Game pad index: " + i); return cs[index]; // end of findGamePad()

In this chapter, we ll cover the following topics: Benefits of benchmarking Guidelines for conducting benchmarks Tools for benchmarking Benefits of profiling Guidelines for profiling Tools for profiling