canvasmain.java

rpg游戏中控制地图移动的例题源码 请大家参考 谢谢大家

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;
	}
	
}