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import net.frog_parrot.util.*; /** * This class is the display of the game. * * @author Carol Hamer */ public class DungeonCanvas extends GameCanvas implements CommandListener { //--------------------------------------------------------// dimension fields // (constant after initialization) /** * the top corner x coordinate according to this * object's coordinate system: */ static int CORNER_X = 0; /** * the top corner y coordinate according to this * object's coordinate system: */ static int CORNER_Y = 0; /** * the width of the portion of the screen that this * canvas can use. */ static int DISP_WIDTH;

You can translate the program for Quasimodo described earlier into the NXC code in Listing 2-1. Try to single out the correspondences between the NXT-G blocks and the NXC statements. Listing 2-1. The Program for Quasimodo task main () { SetSensorLowspeed(IN_4); while (true) { // walk forward OnFwdReg(OUT_A,55,OUT_REGMODE_SPEED); // wait for an obstacle to come near while (SensorUS(IN_4)<20); // stop walking Off(OUT_A); // moan PlayFile("uuu.rso"); Wait(800); // walk backward OnRevReg(OUT_A,55,OUT_REGMODE_SPEED); // wait for the obstacle to get far while (SensorUS(IN_4)>30); } }

The ValidationResult class represents specific results returned by a Validator instance. The ValidationResult class diagram is shown in Figure 12-2.

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Note The #include "NXCDefs.h" statement was used at the top of NXC programs to tell early Beta versions of the NXC preprocessor to include this header file, which was needed to translate every NXC statement into low-level assembly language for the NXT. The latest versions of the NXC compiler (Beta 29 and later) no longer need this preprocessor directive because that file is automatically included at the time of program compilation.

/** * the height of the portion of the screen that this * canvas can use. */ static int DISP_HEIGHT; /** * the height of the font used for this game. */ static int FONT_HEIGHT; /** * the font used for this game. */ static Font FONT; /** * color constant */ public static final int BLACK = 0; /** * color constant */ public static final int WHITE = 0xffffffff; /** * color constant */ public static final int OPAQUE_BLACK = 0xff000000; /** * color constant */ public static final int OPAQUE_BLUE = 0xff0000ff; //--------------------------------------------------------// game object fields /** * a handle to the display. */ Display myDisplay; /** * a handle to the MIDlet object (to keep track of buttons). */ Dungeon myDungeon;

Figure 12-2. ValidationResult class diagram When a Validator instance determines that a rule is violated, a new instance of ValidationResult is created and added to the ValidationResults collection. The parameters

of the ValidationResult constructor are the message to be logged or shown to a user, the object that was tested, a key that shows the location of the validation result within a collection, a tag value that describes the validation result (usually used for filtering or categorizing ValidationResult objects), and the validator object itself. As shown in Figure 12-2, the ValidationResult object also contains five read-only properties for getting the values that were passed into the constructor.

In your program, you use only the main task. Remember that you ll have to put a task named main in every NXC program you ll write. This task is the first one to be executed when the program is run, so you must put it inside all the actions you want your robot to do. Here, you set the input port to 4 to manage the Ultrasonic Sensor using this code:

/** * the LayerManager that handles the game graphics. */ DungeonManager myManager; /** * the Customizer. */ Customizer myCustomizer; /** * whether or not the game has ended. */ static boolean myGameOver; /** * The number of ticks on the clock the last time the * time display was updated. * This is saved to determine if the time string needs * to be recomputed. */ int myDisplayGameTicks = 0; /** * the number of game ticks that have passed since the * beginning of the game. */ int myGameTicks = myDisplayGameTicks; /** * An array of number sprites to hold the digit images * for the time display. */ Sprite[] myNumberSprites = new Sprite[5]; /** * The button to exit the game. */ Command myExitCommand; /** * The button to display the command menu. */ Command myMenuCommand; /** * The button to go to the next board.

The ValidationResults class provides a collection of validation results that were processed during the validation of an object. If validation results were returned, then one or more rules were broken during the validation process. Figure 12-3 shows the ValidationResults class diagram.

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