J2ME 学习范例源代码

package com.j2medev.chapter5.example.hold; import javax.microedition.lcdui.Graphics; import javax.microedition.lcdui.Image; import javax.microedition.lcdui.game.LayerManager; import com.j2medev.chapter5.utility.Clock; import com.j2medev.chapter5.utility.ImageFont; import com.j2medev.chapter5.utility.ImageUtilities; import com.j2medev.chapter5.example.GameScreenHold; import com.j2medev.chapter5.example.InputAction; public class GameWorld { public int width, height; public int viewport_width; public int viewport_height; public int offset_x; public int offset_y; public int text_offset = 0; public InputAction upAction = new InputAction(); public InputAction downAction = new InputAction(); public InputAction leftAction = new InputAction(); public InputAction rightAction = new InputAction(); public InputAction fireAction = new InputAction( InputAction.MODE_INITAL_ONLY); public Plane plane; private Background bk; public Bullets bullets; LayerManager manager; ImageFont fontbig, fontsmall; Image bomb_ico; public int state; final static public int STATE_WAITFORSTART = 1;// 等待状态 final static public int STATE_RUNNING = 2;// 运行状态 final static public int STATE_RESULT = 3;// 显示成绩状态 static public Clock gameClock; public GameWorld(int w, int h) { state = STATE_WAITFORSTART; gameClock = new Clock(); GameScreenHold.inputManager.mapkeyCodeToInputAction( GameScreenHold.KEY_NUM2, upAction); GameScreenHold.inputManager.mapkeyCodeToInputAction(-1, upAction); GameScreenHold.inputManager.mapkeyCodeToInputAction( GameScreenHold.KEY_NUM8, downAction); GameScreenHold.inputManager.mapkeyCodeToInputAction(-2, downAction); GameScreenHold.inputManager.mapkeyCodeToInputAction( GameScreenHold.KEY_NUM4, leftAction); GameScreenHold.inputManager.mapkeyCodeToInputAction(-3, leftAction); GameScreenHold.inputManager.mapkeyCodeToInputAction( GameScreenHold.KEY_NUM6, rightAction); GameScreenHold.inputManager.mapkeyCodeToInputAction(-4, rightAction); GameScreenHold.inputManager.mapkeyCodeToInputAction(-5, fireAction); GameScreenHold.inputManager.mapkeyCodeToInputAction( GameScreenHold.KEY_NUM5, fireAction); width = w; height = h; viewport_width = w>176?176:w; viewport_height = h>208?208:h; offset_x = (width - viewport_width) / 2; offset_y = (height - viewport_height) / 2; plane = Plane.createPlane(this); bk = Background.createBackground(); bullets = Bullets.createBullets(this); fontbig = new ImageFont(ImageUtilities.createImage("/b_number.png"), 10, 19, new char[] { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9' }); fontsmall = new ImageFont(ImageUtilities.createImage("/s_number.png"), 5, 7, new char[] { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9' }); bomb_ico = ImageUtilities.createImage("/bomb_icon.png"); manager = new LayerManager(); manager.append(plane.rest); manager.append(plane.explosion); manager.append(plane); manager.append(bk); manager.setViewWindow(0, 0, viewport_width, viewport_height); } public void reset() { gameClock.restart(); plane.reset(); bullets.initBullets(); resetText_Offset(); } public void paint(Graphics g) { g.setColor(255, 255, 255); g.fillRect(0, 0, width, height); manager.paint(g, offset_x, offset_y); bullets.paint(g, offset_x, offset_y); g.drawImage(bomb_ico, offset_x, offset_y + viewport_height, Graphics.BOTTOM | Graphics.LEFT); if (state != STATE_WAITFORSTART) { fontbig.drawString(g, new Integer( (int) (gameClock.getTime() / 1000)).toString(), offset_x+viewport_width/2-5,offset_y+60); fontsmall.drawString(g, new Integer(plane.bombnum).toString(), offset_x + bomb_ico.getWidth(), offset_y + viewport_height - 10); } if (state == STATE_WAITFORSTART) { String str = "Press FIRE to Start!"; printPrompt(g, str); } if (state == STATE_RESULT) { String str = result(gameClock.getTime()); printPrompt(g, str); } } public void update() { switch (state) { case STATE_WAITFORSTART: if (fireAction.isPressed()) { state = STATE_RUNNING; reset(); } break; case STATE_RUNNING: bk.update(); plane.update(); bullets.updateBullets(plane, plane.state == Plane.STATE_NORMAL); if (plane.state == Plane.STATE_DEAD) { state = STATE_RESULT; gameClock.pause(); } break; case STATE_RESULT: bk.update(); plane.update(); bullets.updateBullets(plane, false); if (fireAction.isPressed()) { state = STATE_RUNNING; reset(); } break; } } public String result(long gametime) { String returnStr; if (gametime < 10000) { returnStr = "Do you play with foot?"; } else if (gametime < 16000) { returnStr = "Come boy, you can do it!"; } else if (gametime < 20000) { returnStr = "What a pity! try again."; } else if (gametime < 25000) { returnStr = "I see you're a real man."; } else if (gametime < 30000) { returnStr = "Great! I know you have talent with the game."; } else if (gametime < 40000) { returnStr = "Can't belive, I met a game master."; } else { returnStr = "Oh my god! Are you a human?"; } return returnStr + " Press FIRE to restart!"; } public void printPrompt(Graphics g, String str) { int oldx = g.getClipX(); int oldy = g.getClipY(); int oldw = g.getClipWidth(); int oldh = g.getClipHeight(); int newx = offset_x; int newy = offset_y + viewport_height / 2 - 20; int neww = viewport_width; int newh = 30; if ((text_offset -= 2) < -g.getFont().stringWidth(str)) resetText_Offset(); // System.out.println(text_offset); g.setColor(54, 34, 45); g.setClip(newx, newy, neww, newh); g.fillRect(newx, newy, neww, newh); g.setColor(255, 255, 255); g.drawString(str, newx + text_offset, newy + 20, Graphics.BASELINE | Graphics.LEFT); g.setClip(oldx, oldy, oldw, oldh); } private void resetText_Offset() { text_offset = viewport_width; } }