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In this class, two polygons are used: one to keep the basic shape, and the other to apply the final translation and rotation and to paint on screen. Listing 4-3. The PolygonSprite Class Used by Asteroids package ch04.game; import ch04.common.Polygon; import android.graphics.Canvas; import android.graphics.Paint; /************************************************************ * The PolygonSprite class defines a game object, including it's shape, * position, movement and rotation. It also can determine if two objects * collide. ************************************************************/ public class PolygonSprite { // Base sprite shape, centered at the origin (0,0). public Polygon shape; // Final location and shape of sprite after // applying rotation and translation to get screen // position. Used for drawing on the screen and in // detecting collisions. public Polygon sprite; boolean active; // Active flag. double angle; // Current angle of rotation. double deltaAngle; // Amount to change the rotation angle. double deltaX, deltaY; // Amount to change the screen position. // coords int x; int y; // Constructors:

So far we have seen how Logger objects encapsulate logging information and how different Appender objects are capable of printing logging information to different destinations. But how do Logger objects pass logging information to Appender objects Creating an intermediate link object named LoggingEvent does the trick. 1. The org.apache.log4j.spi.LoggingEvent class encapsulates all the relevant logging information such as the fully qualified name of the caller class, the level of the logging message, the message itself, the Logger instance, the timestamp, and optionally a java.lang. Throwable instance. 2. Before proceeding to hand over the logging request to any associated Appender, the Logger creates an instance of the LoggingEvent object with the logging-related information. 3. The Logger object then calls the doAppend(LoggingEvent event) method of the Appender objects. 4. The doAppend() method performs some crucial checks on the logging request such as comparing the requested logging level with the threshold level of any Appender associated with the Logger, checking if the Appender is open, and checking any associated Filter object with the Appender. 5. If it finds a Filter object, it invokes that Filter object to make further decisions about the logging request. Once approved, the append() method of the associated subclass Appender object takes over and publishes the logging information.

Add the Manager account to the Group or user names listing. Make sure all options in the Permissions for Manager listing are set to Allow. Add the Employee account to the Group or user names listing. Make sure all options in the Permissions for Employee are set to Deny (see Figure 12-4).

Figure 12-4. Setting permissions on the Managers Only folder Create a text file in the Managers Only folder and enter some text into it. Now, log in using the Employee account, launch Notepad, and try to open the text file in the Managers Only folder. An Access Denied message appears informing that the Employee account is denied access to the file because the files inherit permission settings from the folder, and Notepad is running under the Employee security context.

public PolygonSprite() { this.shape = new Polygon(); this.active = false; this.angle = 0.0; this.deltaAngle = 0.0; this.x = 0; this.y = 0; this.deltaX = 0.0; this.deltaY = 0.0; this.sprite = new Polygon(); } public void render(int width, int height) { int i; // Render the sprite's shape and location by rotating it's // base shape and moving it to its proper screen position. this.sprite = new Polygon(); for (i = 0; i < this.shape.npoints; i++) { this.sprite.addPoint((int) Math.round(this.shape.xpoints[i] * Math.cos(this.angle) + this.shape.ypoints[i] * Math.sin(this.angle)) + (int) Math.round(this.x) + width / 2, (int) Math.round(this.shape.ypoints[i] * Math.cos(this.angle) - this.shape.xpoints[i] * Math.sin(this.angle)) + (int) Math.round(this.y) + height / 2); } } public boolean isColliding(PolygonSprite s) { int i; // Determine if one sprite overlaps with another, i.e., if any vertice // of one sprite lands inside the other. for (i = 0; i < s.sprite.npoints; i++) { if (this.sprite.contains(s.sprite.xpoints[i], s.sprite.ypoints[i])) { return true; } } for (i = 0; i < this.sprite.npoints; i++) { if (s.sprite.contains(this.sprite.xpoints[i], this.sprite.ypoints[i])) { return true; }

Note If you don t grant a user access to a folder (for example, c:\secure\), but grant the user access to

The doAppend() method in each of the Appender objects is synchronized. This means log4j is thread-safe and publishing of logging events happens in a synchronous manner. On the other hand, log4j is designed to work with multiple threads acting together.

a file in that folder (for example, c:\secure\filename.txt), the user can still access that file. It may be difficult, however, as the user cannot browse through the folder to locate the file because the user hasn t been given permission to access the folder.

Navigate to C:\Windows\. Locate cmd.exe and right-click it to display the context menu. Select the Run As option from the context menu. This displays the Run As dialog box, which allows you to impersonate a different account without having to log in as someone else (see Figure 12-5).