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An authorization rule provider is described entirely by its configuration. The provider is a set of one or more rule definitions. Follow these steps to configure the authorization rule provider:

I assume you re familiar with red, green, and blue, but you might not know what alpha means in this context Alpha refers to how transparent the pixel is As you might guess from the constants in Listing 10-4, 0xff000000 gives a fully opaque pixel and 0x00000000 gives a fully transparent pixel, and the intermediate values give semitransparent pixels A transparent pixel is completely invisible when painted over an opaque pixel Fully opaque and fully transparent are the only two possibilities that a MIDP device is required to support; however, if some blending is supported, then two semitransparent pixels will have their colors blended (according to their relative opacity) when painted on top of one another If the platform doesn t support any alpha blending, then semitransparent pixels will be treated as fully transparent..

CHAPTER 8 JOHNNXT IS ALIVE!

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1. In the Enterprise Library Configuration Console, right-click the Authorization node of the Security Application Block and select New Authorization Rule Provider. 2. Set the Name property to Task 1 Rule. 3. Right-click the new authorization rule provider and select New Rule. 4. Set the rule s Name property to DemoRule. 5. Click the ellipsis next to the Expression property. This will open the Rule Expression Editor dialog box. 6. In the dialog box, click the Role button. This adds an R: in the Expression text area. Type Manager after the colon, as shown in Figure 11-4. This rule designates that the identity being authorized must be in the Manager role.

Averaging many measurements over time is useful for lowering the uncertainty of the whole measureTip ment. For example, imagine making a single measurement of the sound level, right when an unpredictable loud noise occurs. You would get a bad estimation of the real environment s background noise: in fact, you expected to get a low percentage value, but your single measurement has returned a high value, because of that sudden loud noise. In robotics, it s a bad habit to trust a single measurement. To avoid having a single measurement corrupt your estimation with its high uncertainty, it s common use to average many measurements over time. Every time you make a new measurement, it contributes to lowering the estimation s uncertainty.

One thing to note about the ColorChanger utility (Listing 10-4) is that it requires at least MIDP 2. If your target platform has only MIDP 1, it s still possible to modify the colors of an image by reading the PNG file into a byte array and modifying the data before converting it into an Image object. The PNG image format contains a palette of colors that the image uses, and the pixels of the image are mapped to different colors in the palette. So you can change a particular color everywhere it appears in the Image merely by changing one value in the color palette. This is actually more efficient (even on handsets that support MIDP 2 and greater) because all you have to do is change one value in the color palette rather than modifying the whole image pixel by pixel. The drawback is that there s a little more work to do to parse the PNG file data. The technique shown here is a little simpler and more intuitive for the programmer. And when I ran this version on my Sagem my700x, I didn t have any performance problems, so for this example I decided to go with the simpler technique.

Note The Rule Expression Editor does allow you to test that an expression is valid or that it works under

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