print barcode label using vb.net Figure 1-13. Deep Green with the simplistic solution in Objective-C

Painting Quick Response Code in Objective-C Figure 1-13. Deep Green with the simplistic solution

Figure 1-13. Deep Green with the simplistic solution
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By stimulating the user s curiosity, I m not only engaging her, but I m also allowing myself to get rid of a bunch of clutter. The user doesn t need to drag both white and black pieces from the drawer onto the board simultaneously. And here s the interesting part; by hiding the UI, I m making it even more powerful. In this context I ve done that by allowing the user to double-tap a piece to toggle its color. So if you have a black knight on the board and you want it to be white, simply double-tap it. So, you could easily place all the pieces in just one color and then double-tap the pieces that need to be the opposite color. If you double-tap a piece in the drawer, all drawer pieces swap color (just like tapping the color switch button), as shown in Figure 1-14. The power is in what s not there, rather than in what is there. That s my simplistic solution. My solution for setting the game state is to reuse the UI that s already there in the form of the Game Info view under the i-button (shown earlier in Figure 1-11). Once again, I ve eliminated unneeded UI by implementing a design that can be used for both displaying and setting the game state and information while both playing the game and setting up a given position.
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Figure 1-14. Drawer pieces in the process of toggling from white to black in a chain reaction type of animation
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CHAPTER 1: Simplify the User Interface for Complex Games: Chess, the Deep Green Way
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NOTE
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The ultimately simplistic way of setting up a position is of course the FEN string, which, by the way, is one of the options Deep Green offers in its internal API. The FEN string lets you specify the position by listing the pieces on each rank and appending the game state. The position shown in Figure 1-14 would be r4rk1/pppn3p/3b2p1/3b1Bq1/3P4/2P4P/P1Q2Pp1/RR4K1 w - - 0 20. Using this method in the user interface on the iPhone would perhaps be challenging the user too much, I think.
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The last of the three game modes, besides Play mode and Setup mode, is Playback mode. This is where you can step back and forth in the game and resume playing from any position. Here, also, I ve taken a somewhat different approach than the other chess applications currently available for the iPhone and iPod touch. Where these applications don t seem to offer an explicit mode, they let you rather implicitly undo and redo moves. On one side, this is very straightforward, but on the other, it s rather constraining. A big part of learning chess, besides simply playing it, of course, is studying others games. As a user, you d want to step through a game in order to learn from it without taking back moves. There s a big difference between taking back and forth moves and stepping back and forth. Where taking back and forth modifies the game, stepping doesn t. I took this even further in Deep Green by letting the user single-step back and forth, jump to the beginning and to the end of the game, and auto-replay a game by animating the moves in sequence just like playing a movie for the user to sit back and enjoy. All these operations animate the pieces smoothly (see Figure 1-15). The slider in the familiar drawer even lets you scrub back and forth with instant feedback. So when you drag the slider, the position on the board updates itself immediately to reflect the given position. This way you can quickly jump to a certain stage in the game and finetune the position on the back and previous buttons. I find myself doing this all the time, and the feedback is extremely rewarding. You feel in total control, and you get a sense of a very powerful device and application because Deep Green reacts immediately.
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