一个J2ME地牢游戏的源码 |
| 作者：J2MEDEV 来源：J2MEDEV 发布时间：2006-7-25 9:06:59 |
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ssage and displays the message.. */ void errorMsg(Exception e) { if (e.getMessage() == null) { errorMsg(e.getClass().getName()); } else { errorMsg(e.getClass().getName() + ":" + e.getMessage()); } } /** * Displays an error message alert if something goes wrong. */ void errorMsg(String msg) { Alert errorAlert = new Alert("error", msg, null, AlertType.ERROR); errorAlert.setCommandListener(this); errorAlert.setTimeout(Alert.FOREVER); Display.getDisplay(this).setCurrent(errorAlert); } } /** * This class represents doors and keys. * * @author Carol Hamer */ class DoorKey extends Sprite { //--------------------------------------------------------- // fields /** * The image file shared by all doors and keys. */ public static Image myImage; /** * A code int that indicates the door or key's color. */ private int myColor; //--------------------------------------------------------- // get/set data /** * @return the door or key's color. */ public int getColor() { return (myColor); } //--------------------------------------------------------- // constructor and initializer static { try { myImage = Image.createImage("/images/keys.png"); } catch (Exception e) { throw (new RuntimeException( "DoorKey.<init>-->failed to load image, caught " + e.getClass() + ": " + e.getMessage())); } } /** * Standard constructor sets the image to the correct frame (according to * whether this is a door or a key and what color it should be) and then * puts it in the correct location. */ public DoorKey(int color, boolean isKey, int[] gridCoordinates) { super(myImage, DungeonManager.SQUARE_WIDTH, DungeonManager.SQUARE_WIDTH); myColor = color; int imageIndex = color * 2; if (isKey) { imageIndex++; } setFrame(imageIndex); setPosition(gridCoordinates[0] * DungeonManager.SQUARE_WIDTH, gridCoordinates[1] * DungeonManager.SQUARE_WIDTH); } } /** * This class is a set of simple utility functions that can be used to convert * standard data types to bytes and back again. It is used especially for data * storage, but also for sending and receiving data. * * @author Carol Hamer */ class DataConverter { //-------------------------------------------------------- // utilities to encode small, compactly-stored small ints. /** * Encodes a coordinate pair into a byte. * * @param coordPair * a pair of integers to be compacted into a single byte for * storage. WARNING: each of the two values MUST BE between 0 and * 15 (inclusive). This method does not verify the length of the * array (which must be 2!) nor does it verify that the ints are * of the right size. */ public static byte encodeCoords(int[] coordPair) { // get the byte value of the first coordinate: byte retVal = (new Integer(coordPair[0])).byteValue(); // move the first coordinate's value up to the top // half of the storage byte: retVal = (new Integer(retVal << 4)).byteValue(); // store the second coordinate in the lower half // of the byte: retVal += (new Integer(coordPair[1])).byteValue(); return (retVal); } /** * Encodes eight ints into a byte. This could be easily modified to encode * eight booleans. * * @param eight * an array of at least eight ints. WARNING: all values must be 0 * or 1! This method does not verify that the values are in the * correct range nor does it verify that the array is long * enough. * @param offset * the index in the array eight to start reading data from. * (should usually be 0) */ public static byte encode8(int[] eight, int offset) { // get the byte value of the first int: byte retVal = (new Integer(eight[offset])).byteValue(); // progressively move the data up one bit in the // storage byte and then record the next int in // the lowest spot in the storage byte: for (int i = offset + 1; i < 8 + offset; i++) { retVal = (new Integer(retVal << 1)).byteValue(); retVal += (new Integer(eight[i])).byteValue(); } return (retVal); } //-------------------------------------------------------- // utilities to decode small, compactly-stored small ints. /** * Turns a byte into a pair of coordinates. */ public static int[] decodeCoords(byte coordByte) { int[] retArray = new int[2]; // we perform a bitwise and with the value 15 // in order to just get the bits of the lower // half of the byte: retArray[1] = coordByte & 15; // To get the bits of the upper half of the // byte, we perform a shift to move them down: retArray[0] = coordByte >> 4; // bytes in Java are generally assumed to be // signed, but in this coding algorithm we // would like to treat them as unsigned: if (retArray[0] < 0) { retArray[0] += 16; } return (retArray); } /** * Turns a byte into eight ints. */ public static int[] decode8(byte data) { int[] retArray = new int[8]; // The flag allows us to look at each bit individually // to determine if it is 1 or 0. The number 128 // corresponds to the highest bit of a byte, so we // start with that one. int flag = 128; // We use a loop that checks // the data bit by bit by performing a bitwise // and (&) between the data byte and a flag: for (int i = 0; i < 8; i++) { if ((flag & data) != 0) { retArray[i] = 1; } else { retArray[i] = 0; } // move the flag down one bit so that we can // check the next bit of data on the next pass // through the loop: flag = flag >> 1; } return (retArray); } //-------------------------------------------------------- // standard integer interpretation /** * Uses an input stream to convert an array of bytes to an int. */ public static int parseInt(byte[] data) throws IOException { DataInputStream stream = new DataInputStream(new ByteArrayInputStream( data)); int retVal = stream.readInt(); stream.close(); return (retVal); } /** * Uses an output stream to convert an int to four bytes. */ public static byte[] intToFourBytes(int i) throws IOException { ByteArray |
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