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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then open the door // otherwise bounce off if (myPrincess.collidesWith(myDoors[i], true)) { if ((myHeldKey != null) && (myDoors[i].getColor() == myHeldKey.getColor())) { setNeedsRepaint(); myDoors[i].setVisible(false); } else { // if she's not holding the right key, then // she has collided with the door just the same // as if she had collided with a wall: retVal = true; } } } } return (retVal); } } /** * This class is the display of the game. * * @author Carol Hamer */ class DungeonCanvas extends GameCanvas { //--------------------------------------------------------- // dimension fields // (constant after initialization) /** * the height of the black region below the play area. */ static int TIMER_HEIGHT = 32; /** * the top corner x coordinate according to this object's coordinate * system:. */ static final int CORNER_X = 0; /** * the top corner y coordinate according to this object's coordinate * system:. */ static final int CORNER_Y = 0; /** * the width of the portion of the screen that this canvas can use. */ static int DISP_WIDTH; /** * 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 = 0xffffff; //--------------------------------------------------------- // game object fields /** * a handle to the display. */ private Display myDisplay; /** * a handle to the MIDlet object (to keep track of buttons). */ private Dungeon myDungeon; /** * the LayerManager that handles the game graphics. */ private DungeonManager myManager; /** * whether or not the game has ended. */ private 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. */ private int myOldGameTicks = 0; /** * the number of game ticks that have passed since the beginning of the * game. */ private int myGameTicks = myOldGameTicks; /** * we save the time string to avoid recreating it unnecessarily. */ private static String myInitialString = "0:00"; /** * we save the time string to avoid recreating it unnecessarily. */ private String myTimeString = myInitialString; //----------------------------------------------------- // gets/sets /** * This is called when the game ends. */ void setGameOver() { myGameOver = true; myDungeon.pauseApp(); } /** * Find out if the game has ended. */ static boolean getGameOver() { return (myGameOver); } /** * Tell the layer manager that it needs to repaint. */ public void setNeedsRepaint() { myManager.setNeedsRepaint(); } //----------------------------------------------------- // initialization and game state changes /** * Constructor sets the data, performs dimension calculations, and creates * the graphical objects. */ public DungeonCanvas(Dungeon midlet) throws Exception { super(false); myDisplay = Display.getDisplay(midlet); myDungeon = midlet; // calculate the dimensions DISP_WIDTH = getWidth(); DISP_HEIGHT = getHeight(); if ((!myDisplay.isColor()) || (myDisplay.numColors() < 256)) { throw (new Exception("game requires full-color screen")); } if ((DISP_WIDTH < 150) || (DISP_HEIGHT < 170)) { throw (new Exception("Screen too small")); } if ((DISP_WIDTH > 250) || (DISP_HEIGHT > 250)) { throw (new Exception("Screen too large")); } // since the time is painted in white on black, // it shows up better if the font is bold: FONT = Font .getFont(Font.FACE_SYSTEM, Font.STYLE_BOLD, Font.SIZE_MEDIUM); // calculate the height of the black region that the // timer is painted on: FONT_HEIGHT = FONT.getHeight(); TIMER_HEIGHT = FONT_HEIGHT + 8; // create the LayerManager (where all of the interesting // graphics go!) and give it the dimensions of the // region it is supposed to paint: if (myManager == null) { myManager = new DungeonManager(CORNER_X, CORNER_Y, DISP_WIDTH, DISP_HEIGHT - TIMER_HEIGHT, this); } } /** * This is called as soon as the application begins. */ void start() { myGameOver = false; myDisplay.setCurrent(this); setNeedsRepaint(); } /** * sets all variables back to their initial positions. */ void reset() throws Exception { // most of the variables that need to be reset // are held by the LayerManager: myManager.reset(); myGameOver = false; setNeedsRepaint(); } /** * sets all variables back to the positions from a previously saved game. */ void revertToSaved() throws Exception { // most of the variables that need to be reset // are held by the LayerManager, so we // prompt the LayerManager to get the // saved data: myGameTicks = myManager.revertToSaved(); myGameOver = false; myOldGameTicks = myGameTicks; myTimeString = formatTime(); setNeedsRepaint(); } /** * save the current game in progress. */ void saveGame() throws Exception { myManager.saveGame(myGameTicks); } /** * clears the key states. */ void flushKeys() { getKeyStates(); } /** * If the game is hidden by another app (or a menu) ignore it since not much * happens in this game when the user is not actively interacting with it. * (we could pause the timer, but it's not important enough to bother with * when the user is just pulling up a menu for a few seconds) */ protected void hideNotify() { } /** * When it comes back into view, just make sure the manager knows that it * needs to repaint. */ protected void showNotify() { setNeedsRepaint(); } //------------------------------------------------------- // graphics methods /** * paint the game graphics on the screen. */ public void paint(Graphics g) { // color the bottom segment of the screen b |
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