ASP.NET PDF Viewer using C#, VB/NET

It s shameless-plug time: the authors of this book are also the co-creators of the open-source Ajax framework Taconite. We admit this is a bit self-serving, but seriously, we think Taconite is pretty sweet. While originally built for Java Enterprise Edition based applications, we have refactored the core of Taconite into a client-side library that can easily be used with any server-side technology. Beyond that, it wouldn t be terribly hard to port the Taconite serverside components to other technologies such as .NET. What makes Taconite so special Ajax is a fantastic step forward in the evolution of the Web application. However, we ve struggled over the years with the inconsistencies among browsers and the difficulty inherent in developing massive quantities of JavaScript. Since we re basically lazy, we decided to just build it once so we could easily reuse our hard work. (Besides, we can tell our bosses it ll take three weeks, get it done in one, and spend the rest of the time following the trials and tribulations of the Minnesota Vikings.)

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Figure 14-27. Contrast adjustment in the Import window The RIC file is loaded into the NXT automatically when you load an NXT-G program that contains a Display block that uses the file. BricxCC users must manually download the files using the NXT Explorer tool. Figure 14-28 shows the selection of the file created in the preceding example. For full-screen images, you ll want to set the X and Y to 0.

Circle, Square, Circle, Square,

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Figure 14-28. NXT-G Display Options box If you re animating small images on the NXT display, you ll need to erase the old image before redrawing it in its new location. You can erase the entire screen and redraw everything, but that can be a problem if you have a lot of other graphics. The best thing to do is draw an all-white image of the same size over the original object to erase it. For example, if you re moving the little ball image shown being created in Figure 14-26, you d draw a 5-by-5 pixel white block to erase it and then redraw the ball at its new location. You create this white block image, oddly enough, by adding borders to a blank file. This works because the program normally saves only the minimal area containing black pixels. In nxtRICedit, select File New and then Save As. In the Add Borders part of the Save window, enter a 5-by-5 border, as shown in Figure 14-29. The program then saves a small white box.

2. Seriously, how many times Well, we counted: including this one, 19.

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You can make a Pong like video game by combining the nxtRICedit tool to create the graphic elements and the Four Analog Ins project from 13 for paddle control. Figure 14-30 shows a screen shot of the game, and you can find the complete NXC program listing in Appendix C.

We know what your next question is: why should I look at Taconite With Taconite, you don t have to deal with JavaScript and, more important, making sure it works across multiple browsers. The heart of Taconite is a parser that converts normal HTML code into a series of JavaScript commands that dynamically create the content on the browser.

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Listing 14-1 is just the four lines of code that update the ball symbol on the screen. W.ric is the allwhite image that erases the ball at location bx and by. The values for bx and by are then updated by adding the velocity values bxv and bxy. Finally, the ball is redrawn with B.ric at its new location. Listing 14-1. NXC code for updating the ball image GraphicOut(bx, by, "W.ric"); bx=bx+bxv; by=by+byv; GraphicOut(bx, by, "B.ric"); Similar code is used to draw the two paddles. The position of the paddles is determined by the values from channels 2 and 3 on the analog-to-digital (A/D) converter. Because the vertical screen resolution is only 60 pixels, the converter value, which can be as large as 255, must be divided by 4 to scale it down. The ball s velocity is changed by the following situations: if it has hit a paddle, bounced off the top or bottom of the screen, or gone off the ends of the field. Figure 14-31 shows the finished Pong game. The Four Analog Ins project has been moved to a PCB, and 40-tooth gears serve as the player control knobs. The board is attached to a beam with two small screws. The paddles are 2-pixel-wide and 16-pixel-tall black rectangles (P.ric), and their counterpart 2by-16 white rectangles (N.ric) are needed to erase them. You must use the NXT Explorer in BricXCC to download the image files B, W, N, and P.ric to the NXT before running the program.