c# create barcode 4: The Game Controller in Objective-C

Generating QR Code ISO/IEC18004 in Objective-C 4: The Game Controller

CHAPTER 4: The Game Controller
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The Game Controller s Functions
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First you need to set the parameters of your design. What will the controller do In thinking about the game of Pong, you obviously will want the controller to handle the movement of your paddle.
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The Potentiometer for Paddle Movement
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You could have a two-axis controller meaning that you can move the paddle along the up-down axis, or the left-right axis. This would require a control such as a joystick to be part of the controller. Because two-axis control is really no more than two one-axis controls, for now, you ll stick with simply being able to move the paddle left or right, i.e., along only one axis. For this, all you need is a potentiometer or knob. A potentiometer is basically a resistor with a third tap that moves along the length of the resistance. Measuring from this center tap to one of the ends will return a resistance measurement that depends on the position of that center tap. Let s say the total resistance of the potentiometer, from the outer ends, is 10k Ohms. NOTE: Ohms is the unit of measurement for resistance. Similarly, a volt is the unit of measurement for voltage, and an amp is the unit of measurement for current. Typically, most systems that you are working with will operate in the milliamps (thousandths of an amp), millivolts (thousandths of a volt) and killiohms (thousands of ohms). Ohms is an inverse relationship to volts and amps, i.e., as the current (amps) or voltage (volts) gets smaller, the resistance (ohms) gets larger. If you put the probes of a multimeter across these leads, and set the function to Ohms, you will indeed measure 10k Ohms. If you move one of the probes to the middle, then what will you measure It depends on the position of the tap, which is determined by the position to which you turn the knob of the potentiometer. Before going on, a quick couple of analogies might help. If you think of your electrical system as if it were water in a set of pipes, then voltage would be the amount of pressure of the water through those pipes. Think of it as how far on you have set the knob. The more open, the more pressure. The more closed, the less pressure. All the way off, no pressure. Current can be thought of as how fast the water moves through those pipes. Though it seems similar to pressure, it isn t. Imagine you turn your garden hose all the way on and you get a good stream of water coming out of the end at some speed, then, imagine your hose grows to the size of a hose on a fire truck. You can imagine that the water would not come out as fast. Similarly, imagine you have your same hose and place your thumb partially over the opening what happens The water speeds up and comes out faster. Note that at no time did you change the pressure into the hose.
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CHAPTER 4: The Game Controller
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What you did do was change the resistance. When you changed from a small hose to a larger one, you decreased the resistance so that for the same amount of pressure (start thinking voltage) you got a lower flow (or current). The inverse happened when you decreased the size of the hose (increased the resistance); you got more flow (or a higher current). Figure 4 8 depicts three cases of electrical flow in your system. The zig-zag line represents the resistance of the potentiometer, with the lines at the top and bottom being the end taps. The center tap with the arrow is where you are going to take your measurement. The three cases are: (1) you measure before the current gets to the resistance, (2) you measure when the current has gone part way through the resistance, and (3) you measure after the current has travelled through all the resistance.
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