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/** * This method doubles the size of the image by * adding a second copy of the image to the image file * with a new color This is used to create Sprites * with a "focused" and "unfocused" version of * the same image * * @param image the source Image to modify * @param oldColor the color to replace * @param newColor the color to replace it with */ public static Image createFocused(Image image, int oldColor, int newColor) { int width = imagegetWidth(); int height = imagegetHeight(); int simpleSize = width * height; int[] imageData = new int[simpleSize * 2]; // make two copies of the image data one // after the other in the byte array: imagegetRGB(imageData, 0, width, 0, 0, width, height); image.

Figure 11-3. Configured AzMan provider The Scope parameter allows the application to have different sections that act as individual security areas. Note that in a server environment, the Store Location would normally be Active Directory.

CHAPTER 8 JOHNNXT IS ALIVE!

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With the AzMan provider configured, you can use it with the demo application. This example will use the current user s identity and a hard-coded role to show how authorization is performed. First, add the following using statement to the Default.aspx web form s code behind file. using Microsoft.Practices.EnterpriseLibrary.Security; using System.Security.Principal; Next, add a Label control named m_ResultLabel and a Button control named m_AuthAzMan to the form. Then add the code shown in Listing 11-1 to the click event of the Button control. Listing 11-1. Using the AzMan Authorization Provider protected void m_AuthAzMan_Click(object sender, EventArgs e) { IPrincipal principal = new GenericPrincipal( User.Identity, new string[] { "Manager" }); IAuthorizationProvider provider = AuthorizationFactory.GetAuthorizationProvider("AzMan Provider"); if (provider.Authorize(principal, "Task 1")) { m_ResultLabel.Text = "Authorized to perform Task 1"; } else { m_ResultLabel.Text = "Not Authorized to perform Task 1"; } } If the operation or task that is being authorized against does not exist in the XML store, it will cause an XML missing element exception. This is not a very nice way to treat a missing context, so it is best to surround calls to Authorize in a try/catch block.

getRGB(imageData, simpleSize, width, 0, 0, width, height); for(int i = 0; i < simpleSize; i++) { // change the color in the first of the two copies: if(imageData[i] == oldColor) { imageData[i] = newColor; } } return(ImagecreateRGBImage(imageData, width, height * 2, true)); } } The part of this class that requires some further explanation is the part that modifies the transparency Each pixel of an image has a color value given in ARGB format ARGB stands for alpha, red, green, blue So when you write the color value as a hexadecimal integer, you think of it as 0xaarrggbb For example, if the color value is 0x33451027, then the color has 0 27 units of blue, 0 10 units of green, 0 45 units of red, and 0 33 units of alpha.

Note As with most resources, it is best if access is centralized. Repeated calls to a remote service or file

// wait for an event event = WaitEvent(noise,soundFSMtimer); // perform the actions for this state if (event == E_TRIGGER) { state = FSM_COUNTING; count = A_FOLDED; } else if (event == E_ELAPSE) { // reset the timer soundFSMtimer = CurrentTick(); } else if (event == E_EXIT) exit = true; } else if (state == FSM_COUNTING) { // displays information onscreen line 3 ShowArmsState(count,3); // wait for an event event = WaitEvent(noise,soundFSMtimer); // perform the actions for this state if (event == E_TRIGGER) { count++; if (count>A_ROTATE) count = A_ROTATE; // reset the timer soundFSMtimer = CurrentTick(); } else if (event == E_ELAPSE) { // reset the timer soundFSMtimer = CurrentTick(); Remote(count,ACK_DONE); state = FSM_IDLE; } else if (event == E_EXIT) exit = true; } } } The J5_Manipulation() subroutine is called by the principal JohnNXT FSM from the main task, when you choose the Arms Control item from the JohnNXT menu. This subroutine starts measuring the average ambient noise by calling the MeasureNoise() function, which reads the Sound Sensor ten times and then computes the arithmetic average.

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