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MIDP1.0下实现MIDP2.0里的TiledLayer

	MIDP1.0下实现MIDP2.0里的TiledLayer
	Author: 一滴蔚蓝色 \| Date: 2008-05-10 \| View: 415 \| 开发技术 - 程序设计

import javax.microedition.lcdui.Display;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;

public class MIDletMain extends MIDlet implements Runnable{
   private static Display dis;
   private static CanvasMain cas;
   private static Thread t;

   public MIDletMain() {
       dis = Display.getDisplay(this);
       cas = new CanvasMain();
       dis.setCurrent(cas);
   }

   protected void startApp() throws MIDletStateChangeException {
       t = new Thread(this);
       t.start();
    }

   protected void pauseApp() {

   }

   protected void destroyApp(boolean arg0) throws MIDletStateChangeException {
       CanvasMain.exit();
       notifyDestroyed();
   }

   public final void run() {
       cas.run();
       try {
           destroyApp(false);
       } catch (MIDletStateChangeException e) {
           e.printStackTrace();
       }
   }
}

import java.io.IOException;

import javax.microedition.lcdui.Canvas;
import javax.microedition.lcdui.Graphics;
import javax.microedition.lcdui.Image;

public class CanvasMain extends Canvas{
    /** 键值 */
// 通用键值
   public static final byte AVK_0 = 48;
   public static final byte AVK_1 = 49;
   public static final byte AVK_2 = 50;
   public static final byte AVK_3 = 51;
   public static final byte AVK_4 = 52;
   public static final byte AVK_5 = 53;
   public static final byte AVK_6 = 54;
   public static final byte AVK_7 = 55;
   public static final byte AVK_8 = 56;
   public static final byte AVK_9 = 57;
   public static final byte AVK_STAR = 42;
   public static final byte AVK_POUND = 35;
// 标准键值
   public static final byte AVK_UP = -1;
   public static final byte AVK_DOWN = -2;
   public static final byte AVK_LEFT = -3;
   public static final byte AVK_RIGHT = -4;
   public static final byte AVK_SELECT = -5;
   public static final byte AVK_SOFT1 = -6;
   public static final byte AVK_SOFT2 = -7;
// Nokia键值
   public static final byte AVK_PHONE = -10;
// 索爱键值
   public static final byte AVK_BACK = -11;
   public static final byte AVK_C = -8;
// 摩托键值
// public static final byte AVK_UP = 1;
// public static final byte AVK_DOWN = 6;
// public static final byte AVK_LEFT = 2;
// public static final byte AVK_RIGHT = 5;
// public static final byte AVK_SELECT = 20;
// public static final byte AVK_SOFT1 = 22;
// public static final byte AVK_SOFT2 = 21;
// public static final byte AVK_C = 10;

   /** 资源初始化 */
   private static final void init() {
        mapInit();
        screenInit();
       System.gc();
   }

   /** 构造函数 */
   public CanvasMain() {
       setFullScreenMode(true);
// 屏幕宽高
       screenW = 154;
       screenH = 136;
// 滚屏速度
       speed = 7;
// 地图单元格大小
       mapCellW = 16;
       mapCellH = 16;
       init();
   }

   /** 线程 */
   private static final int INTERVALTIME = 80;
   private static boolean isRun;
// 启动线程
   private static final void start() {
       isRun = true;
   }

// 停止线程
   public static final void exit() {
       isRun = false;
   }

// 线程循环
   public final void run() {
       start();
       long oldTime,intervalTime;
       while(isRun) {
           oldTime = System.currentTimeMillis();
           keyRepeated();
           flushGraphics();
           intervalTime = INTERVALTIME - System.currentTimeMillis() + oldTime;
           if(intervalTime > 0) {
               try {
                   Thread.sleep(intervalTime);
               } catch (InterruptedException e) {
                   e.printStackTrace();
               }
           }
       }
       exit();
   }

   /** 绘图 */
   public final void paint(Graphics g) {
        g.setColor(0xFFFFFF);
        g.fillRect(0,0,getWidth(),getHeight());
        mapPaint(g);
   }

   private final void flushGraphics() {
       repaint();
       serviceRepaints();
   }

   /** 用户输入 */
   public static int keyCode;

   protected final void keyPressed(int k) {
        keyCode = k;
       input();
       flushGraphics();
   }

   protected final void keyRepeated() {
       input();
   }

   protected final void keyReleased(int k) {
       keyCode = 0;
       input();
       flushGraphics();
   }

   public static final void input(){
       switch(keyCode)
       {
       case AVK_UP:
       case AVK_2:
            if(screenY <= speed)
                screenY = 0;
            else
                screenY -= speed;
            break;

       case AVK_DOWN:
       case AVK_8:
            if(screenY >= mapH - screenH - speed)
                screenY = mapH - screenH;
            else
                screenY += speed;
            break;

       case AVK_LEFT:
       case AVK_4:
            if(screenX <= speed)
                screenX = 0;
            else
                screenX -= speed;
            break;

       case AVK_RIGHT:
       case AVK_6:
            if(screenX >= mapW - screenW - speed)
                screenX = mapW - screenW;
            else
                screenX += speed;
            break;
       }
   }

   /** 地图 */
// 地图单元格的宽高
   private static byte mapCellW,mapCellH;
// 地图平铺数组
   private static byte[][] map;
// 地图宽高
   private static int mapW,mapH;
// 地图列数、行数
   private static int mapCol,mapRow;
// 地图单元格的宽高
   private static Image[] imgMapCell;

   private static final void mapInit(){
        map = new byte[][]{
                {68,68,68,68,68,68,68,68,68,68,68,68,68,68,68,68,68,68,68,68,68,68,68,68,68,68,68,
68,68,68,68,28,9 ,18,3 ,3 ,73,19,25,25,},

                {68,68,68,68,38,38,68,68,68,68,68,68,68,68,68,68,68,68,68,68,68,68,68,68,68,68,68,
68,68,70,68,28,18,3 ,3 ,13,14,3 ,3 ,19,},

                {68,68,68,28,7 ,8 ,26,68,68,68,69,69,69,69,69,69,68,70,68,68,68,68,38,38,38,38,38,38,68,68,68,28,0 ,
2 ,2 ,4 ,5 ,1 ,26,68,},

                {68,68,68,28,16,17,26,68,68,68,69,69,68,68,68,69,68,68,68,68,68,28,0 ,2 ,
2 ,2 ,2 ,1 ,26,68,38,39,9 ,29,29,29,29,10,26,68,},

                {68,68,68,68,50,50,68,68,68,68,69,69,68,68,68,69,69,72,69,69,68,28,18,20,29,29,44,
10,26,28,0 ,2 ,11,29,29,30,29,10,26,68,},

                {68,70,68,68,68,68,68,68,70,68,69,69,68,68,68,68,68,68,69,69,69,69,72,27,29,29,53,
10,26,28,9 ,29,29,29,29,29,29,10,26,68,},

                {68,68,68,68,68,68,68,68,68,68,69,69,68,68,68,68,70,68,68,69,69,69,72,36,29,29,29,
10,26,28,18,3 ,20,29,29,29,29,10,26,68,},

                {68,68,68,68,68,68,68,74,68,68,72,69,68,68,68,68,68,68,68,69,69,68,28,18,3 ,13,14,19,26,68,68,62,9 ,29,29,29,29,10,26,68,},

                {68,68,68,70,68,68,68,68,68,68,69,69,68,68,38,38,38,68,68,69,69,68,68,62,29,29,23,
77,68,68,68,28,18,3 ,13,14,3 ,19,37,38,},

                {68,68,74,68,68,68,68,68,68,68,69,69,70,28,29,44,30,26,68,69,69,68,68,68,50,72,
72,68,68,68,68,68,50,62,29,46,77,62,7 ,8 ,},

                {68,68,68,68,68,68,68,70,68,68,69,69,68,28,24,53,35,72,69,69,69,68,68,68,68,69,
69,68,68,68,68,68,68,28,29,46,26,28,16,17,},

                {68,68,68,68,68,68,68,68,68,68,69,69,68,28,29,29,24,26,68,69,69,68,68,68,68,69,
69,68,74,68,68,68,68,68,62,46,26,68,50,50,},

                {68,68,68,68,68,74,68,68,68,68,72,72,68,68,50,72,50,68,68,69,69,68,68,68,68,69,
68,68,68,68,68,68,68,68,28,46,26,68,68,70,},

                {38,38,38,38,68,68,68,68,38,39,29,29,37,68,68,69,68,68,68,69,69,68,68,68,68,69,
68,68,68,68,68,68,68,68,28,46,37,38,68,68,},

                {29,29,29,29,71,71,71,71,29,29,29,29,35,72,69,69,69,69,69,69,69,68,68,69,69,69,
68,68,68,68,68,68,68,68,28,48,52,47,26,68,},

                {29,29,29,29,71,71,71,71,29,29,29,29,24,72,69,69,69,69,69,69,72,68,68,69,69,69,
68,68,70,68,68,68,68,68,68,50,62,46,37,38,},

                {50,50,50,50,68,68,68,62,29,29,29,29,24,26,68,68,68,68,68,68,68,68,68,69,69,69,
68,68,68,68,68,68,70,68,68,68,28,48,52,47,},

                {68,68,68,68,68,68,68,68,50,50,50,50,50,68,68,68,68,68,68,68,68,68,68,69,69,68,
68,68,68,68,68,68,68,68,68,68,68,50,62,46,},

                {38,68,68,68,68,68,68,68,68,68,68,68,68,68,68,68,74,68,68,70,68,68,68,69,69,68,
68,68,68,68,68,68,74,68,68,68,68,68,28,46,},

                {44,37,68,68,68,68,68,70,68,68,68,68,68,68,68,68,68,68,68,68,68,68,68,69,69,69,
69,69,69,69,69,69,68,68,68,68,68,68,28,46,},

                {53,29,37,68,68,68,74,68,68,38,38,38,38,38,68,68,68,68,68,68,68,68,68,69,69,69,
69,69,69,69,72,72,38,68,68,68,68,68,28,46,},

                {25,29,24,37,68,68,68,68,28,0 ,2 ,2 ,2 ,1 ,26,68,68,68,70,68,74,68,68,68,68,68,68,28,0 ,2 ,4 ,5 ,1 ,26,68,68,68,68,28,46,},

                {25,29,29,29,71,71,71,71,71,27,29,29,29,10,26,68,68,68,68,68,68,68,68,70,68,68,
38,39,9 ,29,29,29,10,26,68,70,68,68,28,46,},

                {25,24,29,29,71,71,71,71,71,36,29,29,29,10,26,68,68,68,68,68,68,68,68,70,68,28,
24,29,6 ,29,29,44,10,26,68,68,68,68,28,46,},

                {25,29,29,77,68,28,0 ,2 ,2 ,18,3 ,13,14,19,37,38,38,38,38,38,38,38,68,68,68,28,29,29,15,29,29,53,10,26,68,68,68,
68,28,46,},

                {29,29,29,26,68,28,9 ,23,29,29,29,29,29,0 ,2 ,2 ,2 ,2 ,1 ,29,29,24,26,68,68,28,29,29,18,3 ,3 ,3 ,19,26,68,68,68,68,28,46,},

                {29,72,77,68,68,28,9 ,29,0 ,2 ,2 ,2 ,2 ,11,29,29,29,44,10,7 ,8 ,29,26,68,68,28,29,29,29,29,29,29,29,26,68,68,68,68,28,46,},

                {72,72,68,68,68,28,9 ,29,9 ,29,29,29,29,29,35,29,29,53,10,16,17,29,37,38,68,68,50,50,50,50,72,72,50,68,68,
68,68,70,28,46,},

                {69,69,68,70,68,28,9 ,29,18,13,14,3 ,3 ,20,29,29,29,29,10,2 ,2 ,2 ,2 ,1 ,37,68,68,68,68,68,69,69,68,68,68,68,68,38,39,46,},

                {69,69,68,74,68,28,9 ,29,35,29,29,0 ,2 ,9 ,29,29,29,29,6 ,29,29,24,29,6 ,35,26,68,68,68,68,69,69,68,68,74,68,72,52,52,45,},

                {72,72,68,68,68,28,9 ,29,23,29,29,9 ,29,9 ,29,29,24,29,15,35,29,29,29,15,24,72,69,69,68,68,69,69,68,68,68,68,69,50,62,29,},

                {29,29,26,68,68,28,18,3 ,20,29,29,9 ,29,18,3 ,3 ,3 ,3 ,19,29,29,29,29,10,29,26,68,69,69,68,69,69,68,68,68,68,69,68,68,50,},

                {29,25,26,68,68,68,50,62,9 ,29,29,9 ,29,29,29,29,25,25,29,21,3 ,20,35,10,29,26,68,69,69,69,69,69,68,68,68,68,69,68,68,68,},

                {29,29,37,38,38,38,70,28,18,13,14,18,3 ,3 ,3 ,3 ,3 ,3 ,3 ,19,29,18,3 ,19,29,26,68,68,68,68,68,68,68,68,68,68,69,68,68,68,},

                {25,29,29,29,29,29,37,68,50,62,29,29,29,29,29,24,29,29,29,29,29,29,25,25,77,68,
68,70,68,68,68,68,68,68,68,68,69,69,69,68,},

                {25,29,29,29,29,25,29,26,68,68,50,50,50,50,50,50,50,50,50,50,50,50,50,50,68,74,
68,68,68,68,68,70,68,68,68,68,68,68,69,68,},

                {44,29,29,29,29,29,29,37,38,38,68,68,74,68,68,70,68,68,68,38,38,38,38,38,38,38,
68,69,69,69,72,69,69,69,68,68,68,68,69,68,},

                {53,29,29,29,29,29,29,25,29,29,26,68,68,68,68,68,68,68,28,29,0 ,2 ,2 ,2 ,
2 ,1 ,26,69,68,68,68,68,68,69,68,68,38,38,72,38,},

                {25,29,29,29,29,29,29,29,24,24,72,69,69,69,69,69,68,68,28,29,27,29,29,29,29,6 ,26,69,68,68,74,68,68,69,68,28,29,30,29,29,},

                {25,25,25,25,25,29,29,29,29,77,68,68,68,68,68,69,69,69,72,29,36,29,29,25,29,15,
72,69,68,68,68,68,68,69,69,72,29,29,29,35,},
        };

        mapRow = map.length;
        mapCol = map[0].length;
        mapW = mapCellW * mapCol;
        mapH = mapCellH * mapRow;

        imgMapCell = cellImage("/village.png",mapCellW,mapCellH);
   }

   private static final void mapPaint(Graphics g){
// 计算地图平铺的起始行列、终止行列数
        int startCol = screenX/mapCellW;
        if(startCol < 0)
            startCol = 0;

        int endCol = startCol + screenCol;
        if((screenX % mapCellW) > screenHDepart)
            endCol ++;
        if(endCol > mapCol )
            endCol = mapCol ;

        int startRow = screenY/mapCellH;
        if(startRow < 0)
            startRow = 0;

        int endRow = startRow + screenRow;
        if((screenY % mapCellH) > screenVDepart)
            endRow ++;
        if(endRow > mapRow)
            endRow = mapRow;

// 铺地图
        g.setColor(0x00FF00);
        for(int i=startCol;i<endCol;i++){
            for(int j=startRow;j<endRow;j++){
                byte tiled = map[j][i];
                if(tiled != -1){
                    g.drawImage(imgMapCell[tiled],32+mapCellW * i - screenX,64+mapCellH * j - screenY,0);
                    g.drawRect(32+mapCellW * i - screenX,64+mapCellH * j - screenY,mapCellW,mapCellH);
                }
            }
        }
        g.setColor(0x000000);
        g.drawRect(32,64,screenW,screenH);
        g.drawRect(33,65,screenW-2,screenH-2);
        g.drawString("屏幕大小"+screenW+"*"+screenH,5,5,0);
        g.drawString("移动速度"+speed,120,5,0);
        g.drawString("黑框区域表示屏幕范围",5,30,0);
   }

   /** 屏幕 */
   private static int screenX,screenY,screenW,screenH;
   private static int screenCol,screenRow;
   private static byte screenHDepart,screenVDepart;
   private static byte speed;

   private static final void screenInit(){
// 计算屏幕内的行列数
        screenCol = screenW / mapCellW;
        if(screenW % mapCellW != 0)
            screenCol ++;
        if(screenCol > mapCol)
            screenCol = mapCol;

        screenRow = screenH / mapCellH;
        if(screenH % mapCellH != 0)
            screenRow ++;
        if(screenRow > mapRow)
            screenRow = mapRow;

// 计算屏幕大小与单元格的偏差值
        screenHDepart = (byte) (mapCellW * screenCol - screenW);
        screenVDepart = (byte) (mapCellH * screenRow - screenH);
   }

   /** 工具函数 */
// 创建图片
   public static final Image createImage(String name){
       try {
           return Image.createImage(name);
       } catch (IOException e) {
           System.out.println("createImage");
       }
       return null;
   }

// 从指定图片中获得固定单元格大小的切割图片数组
   public static final Image[] cellImage(String name,int cellW,int cellH){
       Image img = createImage(name);
       if(img == null){
           System.out.println("cellImage");
           return null;
       }
       int t_ImgW = img.getWidth();
       int t_ImgH = img.getHeight();
       if(t_ImgW % cellW != 0 || t_ImgH % cellH != 0){
           System.out.println("cellImage");
           return null;
       }
       int row = t_ImgH / cellH;
       int col = t_ImgW / cellW;
       Image[] o_Img = new Image[row*col];
       for(int i=0;i<o_Img.length;i++)
           o_Img[i] = Image.createImage(img,cellW*(i%col),cellH*(i/col),cellW,cellH,0);
       img = null;
       System.gc();
       return o_Img;
   }

}

思想很简单直接,使用图象的分块以及根据人物的移动来实现图片区域显示

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