gameworld.java

<j2me 开发精解> 詹建光著 里所有的源码。对J2me的开发相当有帮助

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;
    }
    
}