Checkers游戏源码 |
| 作者：J2MEDEV 来源：J2MEDEV 发布时间：2006-7-25 9:04:09 |
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e calculations. * @throws Exception if the display size is too * small to make a checkers. */ CheckersCanvas(Display d) throws Exception { myDisplay = d; myGame = new CheckersGame(); // a few calculations to make the right checkerboard // for the current display. int width = getWidth(); int height = getHeight(); // get the smaller dimension fo the two possible // screen dimensions in order to determine how // big to make the checkerboard. int screenSquareWidth = height; if(width < height) { screenSquareWidth = width; } mySquareSize = screenSquareWidth / GRID_WIDTH; // if the display is too small to make a reasonable checkerboard, // then we throw an Exception if(mySquareSize < myMinSquareSize) { throw(new Exception("Display too small")); } // initialize the crown images: myBlackCrown = Image.createImage("/blackCrown.png"); myWhiteCrown = Image.createImage("/whiteCrown.png"); } /** * This is called as soon as the application begins. */ void start() { myDisplay.setCurrent(this); // prepare the game data for the first move: myGame.start(); } //------------------------------------------------------- // graphics methods /** * Repaint the checkerboard.. */ protected void paint(Graphics g) { int width = getWidth(); int height = getHeight(); g.setColor(WHITE); // clear the board (including the region around // the board, which can get menu stuff and other // garbage painted onto it...) g.fillRect(0, 0, width, height); // If we need to wait for another player to join the // game before we can start, this displays the appropriate // message: if(myIsWaiting) { // perform some calculations to place the text correctly: Font font = g.getFont(); int fontHeight = font.getHeight(); int fontWidth = font.stringWidth("waiting for another player"); g.setColor(WHITE); g.fillRect((width - fontWidth)/2, (height - fontHeight)/2, fontWidth + 2, fontHeight); // write in black g.setColor(BLACK); g.setFont(font); g.drawString("waiting for another player", (width - fontWidth)/2, (height - fontHeight)/2, g.TOP|g.LEFT); return; } // now draw the checkerboard: // first the dark squares: byte offset = 0; for(byte i = 0; i < 4; i++) { for(byte j = 0; j < 8; j++) { // the offset is used to handle the fact that in every // other row the dark squares are shifted one place // to the right. if(j % 2 != 0) { offset = 1; } else { offset = 0; } // now if this is a selected square, we draw it lighter: if(myGame.isSelected(i, j)) { g.setColor(LT_GREY); g.fillRect((2*i + offset)*mySquareSize, j*mySquareSize, mySquareSize, mySquareSize); } else { // if it's not selected, we draw it dark grey: g.setColor(GREY); g.fillRect((2*i + offset)*mySquareSize, j*mySquareSize, mySquareSize, mySquareSize); } // now put the pieces in their places: g.setColor(RED); int piece = myGame.getPiece(i, j); int circleOffset = 2; int circleSize = mySquareSize - 2*circleOffset; if(piece < 0) { // color the piece in black g.setColor(BLACK); g.fillRoundRect((2*i + offset)*mySquareSize + circleOffset, j*mySquareSize + circleOffset, circleSize, circleSize, circleSize, circleSize); // if the player is a king, draw a crown on: if(piece < -1) { g.drawImage(myWhiteCrown, (2*i + offset)*mySquareSize + mySquareSize/2, j*mySquareSize + 1 + mySquareSize/2, Graphics.VCENTER|Graphics.HCENTER); } } else if(piece > 0) { // color the piece in red g.fillRoundRect((2*i + offset)*mySquareSize + circleOffset, j*mySquareSize + circleOffset, circleSize, circleSize, circleSize, circleSize); // if the player is a king, draw a crown on: if(piece > 1) { g.drawImage(myBlackCrown, (2*i + offset)*mySquareSize + mySquareSize/2, j*mySquareSize + 1 + mySquareSize/2, Graphics.VCENTER|Graphics.HCENTER); } } } } // now the blank squares: // actually, this part is probably not necessary... g.setColor(WHITE); for(int i = 0; i < 4; i++) { for(int j = 0; j < 8; j++) { if(j % 2 == 0) { offset = 1; } else { offset = 0; } g.fillRect((2*i + offset)*mySquareSize, j*mySquareSize, mySquareSize, mySquareSize); } } // if the player has reached the end of the game, // we display the end message. if(myGame.getGameOver()) { // perform some calculations to place the text correctly: Font font = g.getFont(); int fontHeight = font.getHeight(); int fontWidth = font.stringWidth("Game Over"); g.setColor(WHITE); g.fillRect((width - fontWidth)/2, (height - fontHeight)/2, fontWidth + 2, fontHeight); // write in black g.setColor(BLACK); g.setFont(font); g.drawString("Game Over", (width - fontWidth)/2, (height - fontHeight)/2, g.TOP|g.LEFT); } } //------------------------------------------------------- // handle keystrokes /** * Move the player. */ public void keyPressed(int keyCode) { if(myGame.isMyTurn()) { int action = getGameAction(keyCode); switch (action) { case LEFT: myGame.leftPressed(); break; case RIGHT: myGame.rightPressed(); break; case UP: myGame.upPressed(); break; case DOWN: myGame.deselect(); break; } repaint(); serviceRepaints(); } } } /** * This class contacts a remote server in order to * play a game of checkers against an opponent.. * * @author Carol Hamer */ class Communicator extends Thread { //-------------------------------------------------------- // static fields /** * This is the URL to contact. * IMPORTANT: before compiling, the following URL * must be changed to the correct URL of the * machine running the server code. */ public static final String SERVER_URL = "socket://malbec:8007"; /** * The int to signal that the game is to begin. */ public static final byte START_GAME_FLAG = -4; /** * The byte to signal that the game is to end. */ public static final byte END_GAME_FLAG = -3; / |
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