rpgcanvas.java

J2ME rpg游戏《游戏的故事》设计文档以及详细讲解。对于学习j2me rpg游戏编程的初学者十分珍贵

import javax.microedition.lcdui.game.GameCanvas;
import javax.microedition.lcdui.Graphics;
import javax.microedition.lcdui.game.LayerManager;
import javax.microedition.lcdui.game.Sprite;
import javax.microedition.lcdui.Image;
import javax.microedition.lcdui.game.TiledLayer;
import java.io.IOException;
import java.io.InputStream;
import java.lang.Thread;
import java.lang.InterruptedException;
import java.util.Vector;
import javax.microedition.lcdui.Font;
import javax.microedition.lcdui.Display;

public class RpgCanvas extends GameCanvas implements Runnable {
	public final static int scrW=240;			//	width of the view window (in pixel)
	public final static int scrH=256;			//	height of the view window (in pixel)
	public final static int scrGW=(scrW/16);	// 	width of the view window (in 16x16 grid)
	public final static int scrGH=(scrH/16);	// 	height of the view window (in 16x16 grid)
	private TiledLayer gnd=null,obj=null;		//	ground layer and object layer
	private LayerManager map=null;
	public Sprite mainChr=null;				//	main character
	private GameData theGame;					//	store all game data which need be stored
												//	in RMS. 
	public Rpg parent=null;
	public TiledLayer dlgbox=null;
	
	private Graphics g=getGraphics();
	private int mapW,mapH;						//	width and height of current map
	private boolean pass[];
	private byte[] hasEvent;
	private Vector script[];
	public int dir=2;
	private TiledLayer menuBack=null;
	private int stepsLeft;
	private int encAcc=20;
	public SoundPlayer sp=new SoundPlayer();
	private Vector text;
	
	private static int[][] walkSeq=new int[4][2];
	static{	
		walkSeq[0][0]=0;	walkSeq[0][1]=1;
		walkSeq[1][0]=2;	walkSeq[1][1]=3;
		walkSeq[2][0]=4;	walkSeq[2][1]=5;
		walkSeq[3][0]=6;	walkSeq[3][1]=7;
	}
	
	private int mapX,mapY;
	public BattleCanvas battle;
	public boolean bExit = false;
	public void render() {
//		System.out.println ("mapW:"+mapW+" mapH"+mapH+"\nplrX:"+theGame.playerX+"plrY"+theGame.playerY);
		g.setColor(0);
		g.fillRect(0,0,scrW,scrH);
		mainChr.setPosition(theGame.playerX*16,theGame.playerY*16-8);
		int mx=theGame.playerX-scrGW/2; 
		if(mapW<scrGW) mx=(mapW-scrGW)/2;
		else if(mx>(mapW-scrGW)) mx=mapW-scrGW;
		else if(mx<0) mx=0; 
		mx*=16;
		int my=(theGame.playerY-scrGH/2);
		if(mapH<scrGH) my=(mapH-scrGH)/2;
		else if(my>(mapH-scrGH)) my=mapH-scrGH;
		else if(my<0) my=0;
		my*=16;
//		System.out.println ("x:"+theGame.playerX+" y:"+theGame.playerY);
		map.setViewWindow(mx,my,scrW,scrH);
		map.paint(g,0,0);
//		g.setColor(0xff0000);
//		g.fillRect(15,10,50*theGame.HP/theGame.MaxHP,5);
//		g.setColor(0xf0f00);
//		g.fillRect(15,15,50*theGame.EXP/theGame.expNext,5);
//		g.setColor(0xffffff);
//		g.drawRect(15,10,50,10);
		flushGraphics();
		mapX=mx;mapY=my;
	}
	public void paint(Graphics gr){
//		render();
		gr.setColor(0xffffff);
		gr.fillRect(0,0,30,30);
	}
	public RpgCanvas(GameData gd,Rpg r) {
		super(false);
//		Display.getDisplay(parent).vibrate(200);
//		ExceptionCanvas ec=new ExceptionCanvas("begin");
//		Display.getDisplay(r).setCurrent(ec);
		parent=r;
		battle=new BattleCanvas(gd,this);
		theGame=gd;
		text=new Vector();
		script=new Vector[2];
		script[0]=new Vector();
		script[1]=new Vector();
//		ec.setString("battleCanvas OK");
		try{
			Image gndImg=Image.createImage("/res/gnd.png");
//			ec.setString("img and map OK");
			Image objImg=Image.createImage("/res/obj.png");
			Image chrImg=Image.createImage("/res/chr.png");
			Image dlgImg=Image.createImage("/res/box.png");
			mainChr=new Sprite(chrImg,16,24);
			gnd=new TiledLayer(40,40,gndImg,16,16);
			obj=new TiledLayer(40,40,objImg,16,16);
			map=new LayerManager();
			gnd.createAnimatedTile(127);
			map.append(mainChr);
			map.append(obj);
			map.append(gnd);
			dlgbox=new TiledLayer(scrW/16,4,dlgImg,16,16);
			int i,j;
			dlgbox.setCell(0,0,1);
			for(i=1;i<scrW/16-1;i++) dlgbox.setCell(i,0,2);
			dlgbox.setCell(scrW/16-1,0,3);
			for(j=1;j<3;j++){
				dlgbox.setCell(0,j,4);
				for(i=1;i<scrW/16-1;i++) dlgbox.setCell(i,j,5);
				dlgbox.setCell(scrW/16-1,j,6);
			}
			dlgbox.setCell(0,3,7);
			for(i=1;i<scrW/16-1;i++) dlgbox.setCell(i,3,8);
			dlgbox.setCell(scrW/16-1,3,9);
//			ec.setString("dlgbox OK");
			menuBack=new TiledLayer(scrW/16,scrH/16,dlgImg,16,16);
			menuBack.fillCells(0,0,scrW/16,scrH/16,5);
			menuBack.setCell(0,0,1);
			for(i=1;i<scrW/16-1;i++) menuBack.setCell(i,0,2);
			menuBack.setCell(scrW/16-1,0,3);
			for(i=1;i<scrH/16-1;i++){
				menuBack.setCell(0,i,4);
				menuBack.setCell(scrW/16-1,i,6);
			}
			menuBack.setCell(0,scrH/16-1,7);
			for(i=1;i<scrW/16-1;i++) menuBack.setCell(i,scrH/16-1,8);
			menuBack.setCell(scrW/16-1,scrH/16-1,9);
//			ec.setString("menu OK");
		}catch(Throwable ioe){
//			System.out.println (ioe.getMessage());
		//	Display.getDisplay(r).setCurrent(new ExceptionCanvas(ioe.getMessage()));
		}
	}

	protected void loadMap(String filename) {
//		System.out.println ("Loading "+filename);
		script[0].removeAllElements();
		script[1].removeAllElements();
		theGame.enemy.removeAllElements();
		text.removeAllElements();
		g.setColor(0);
		g.fillRect(0,0,scrW,scrH);
		g.setColor(0xffffff);
		g.drawString("Download拞...",scrW-Font.getDefaultFont().stringWidth("Download拞...姰惉!")-20,scrH-30,Graphics.TOP|Graphics.LEFT);
		flushGraphics();
		gnd.fillCells(0,0,39,39,0);
		obj.fillCells(0,0,39,39,0);
		int d,d2,d3;	int[] cnt=new int[2];
		cnt[0]=0;cnt[1]=0;
		byte[] bt;
		String t=null;
		try{
			InputStream is=getClass().getResourceAsStream(filename);
			mapW=is.read();
			mapH=is.read();
			pass=new boolean[mapW*mapH];
			hasEvent=new byte[mapW*mapH];
			int i,j,k=0;
			d=is.read();	d2=is.read();
			bt=new byte[d*256+d2];
			is.read(bt);
			script[1].addElement(bt);
			gnd.fillCells(0,0,40,40,116);
			for(j=0;j<mapH;j++){
				for(i=0;i<mapW;i++){
					d=is.read();
					if(d==127) gnd.setCell(i,j,-1);
					else gnd.setCell(i,j,d);
					obj.setCell(i,j,is.read());
					pass[j*mapW+i]=is.read()==0?false:true;
					d3=is.read();
					if(d3==0) {hasEvent[k]=0;k++;continue;}
					d3-=1;
					hasEvent[k]=(byte)(d3<<7);
					d=is.read();	d2=is.read();
					bt=new byte[d*256+d2];
					is.read(bt);
					script[d3].addElement(bt);
					cnt[d3]+=1;
					hasEvent[k]|=(cnt[d3]&0x7f);
					k++;
				}
			}
//			testScript();
			is.close();
			is=getClass().getResourceAsStream(filename+".txt");
			is.read();	is.read();
			StringBuffer sb=new StringBuffer();
			while((d=is.read())!=-1){
				d2=is.read();
				if(d==0x00&&d2==0x0a){
					t=new String(sb);
					text.addElement(t);
					sb.setLength(0);
				}else{
					sb.append((char)((d<<8)|d2));
				}
			}
			is.close();
		g.drawString("Download拞...姰惉!",scrW-Font.getDefaultFont().stringWidth("Download拞...姰惉!")-20,scrH-30,Graphics.TOP|Graphics.LEFT);
		flushGraphics();
		}catch(IOException ioe){
//			System.out.println (ioe.getMessage());
		}
		runScript((byte[])script[1].elementAt(0));
	}

	public void run() {
//		setFullScreenMode(true);
//		Display.getDisplay(parent).setCurrent(battle);
//		battle.startBattle(0);
		//System.gc();
		bExit=false;
		sp.setEnable(theGame.sound);
		sp.setListener(battle);
		loadMap(theGame.curMap);
		int key;
		boolean bPaint=true;
		long time,last,waterLast;
		mainChr.setFrameSequence(walkSeq[dir]);
		last=0;
		waterLast=0;
		stepsLeft=Math.abs(battle.rnd.nextInt()%(20-theGame.enemy.size()));
		while(true){
			time=System.currentTimeMillis();
			if((time-last)>300){
				last=time;
				mainChr.nextFrame();
				bPaint=true;
			}
			if((time-waterLast)>605){
				waterLast=time;
				gnd.setAnimatedTile(-1,gnd.getAnimatedTile(-1)==127?128:127);
				bPaint=true;
			}
			if(bExit) return;
			if(stepsLeft<0){
				if(theGame.enemy.size()>0){
					stepsLeft=Math.abs(battle.rnd.nextInt()%theGame.enemy.size());
					drawText(null,battle.name[((Integer)theGame.enemy.elementAt(stepsLeft)).intValue()]+" 弌偰偔傞!");
					Display.getDisplay(parent).setCurrent(battle);
					if(battle.startBattle(((Integer)theGame.enemy.elementAt(stepsLeft)).intValue())==1){
						endGame();
						parent.setState(parent.STATE_MENU);
						return;
					}else{
						Display.getDisplay(parent).setCurrent(this);
					}
				}
				stepsLeft=5+Math.abs(battle.rnd.nextInt()%(20-theGame.enemy.size()));
			}
			key=getKeyStates();
			if((key&UP_PRESSED)!=0){
				if(dir!=0){
					dir=0;
					mainChr.setFrameSequence(walkSeq[dir]);
					bPaint=true;
				}else{
					if((theGame.playerY>0)&&!pass[(theGame.playerY-1)*mapW+theGame.playerX]){
						theGame.playerY-=1;
						stepsLeft--;
						bPaint=true;
						handleEvent(true);
					}
				}
			}else if((key&DOWN_PRESSED)!=0){
				if(dir!=2){
					dir=2;
					mainChr.setFrameSequence(walkSeq[dir]);
					bPaint=true;
				}else{
					if((theGame.playerY<mapH-1)&&!pass[(theGame.playerY+1)*mapW+theGame.playerX]){
						theGame.playerY+=1;
						stepsLeft--;
						bPaint=true;
						handleEvent(true);
					}
				}
			}else if((key&LEFT_PRESSED)!=0){
				if(dir!=3){
					dir=3;
					mainChr.setFrameSequence(walkSeq[dir]);
					bPaint=true;
				}else{
					if((theGame.playerX>0)&&!pass[theGame.playerY*mapW+theGame.playerX-1]){
						theGame.playerX-=1;
						stepsLeft--;
						bPaint=true;
						handleEvent(true);
					}
				}
			}else if((key&RIGHT_PRESSED)!=0){
				if(dir!=1){
					dir=1;
					mainChr.setFrameSequence(walkSeq[dir]);
					bPaint=true;
				}else{
					if((theGame.playerX<mapW-1)&&!pass[theGame.playerY*mapW+theGame.playerX+1]){
						theGame.playerX+=1;
						stepsLeft--;
						bPaint=true;
						handleEvent(true);
					}
				}
			}else if((key&FIRE_PRESSED)!=0){
				handleEvent(false);
			}else if((key&GAME_A_PRESSED)!=0){
				drawStatus();
				bPaint=true;
			}else if((key&GAME_C_PRESSED)!=0){
				drawMenu();
				bPaint=true;
			}else if((key&GAME_D_PRESSED)!=0){
				drawMonster();
				bPaint=true;
			}
			if(bPaint){
				render();
//				repaint();
				bPaint=false;
			}
			pause(1);
		}
	}
	private void handleEvent(boolean type){
//		System.out.println ("handleEvent("+type+")");
		int i,j;
		if(type){		// hit
			i=theGame.playerX+theGame.playerY*mapW;
//			System.out.println (Integer.toBinaryString(hasEvent[i]&0xff));
			if(hasEvent[i]==0||(hasEvent[i]&0x80)!=0) return;
			j=hasEvent[i]&0x7f;
			byte[] s=(byte[])(script[0].elementAt(j-1));
			render();
			runScript(s);
		}else{			// press
			if(dir==0&&theGame.playerY!=0)	i=theGame.playerX+(theGame.playerY-1)*mapW;
			else if(dir==1&&theGame.playerX!=mapW-1) i=theGame.playerX+theGame.playerY*mapW+1;
			else if(dir==2&&theGame.playerY!=mapH-1) i=theGame.playerX+(theGame.playerY+1)*mapW;
			else if(dir==3&&theGame.playerX!=0) i=theGame.playerX-1+theGame.playerY*mapW;
			else return;
//			System.out.println (Integer.toBinaryString(hasEvent[i]&0xff));
			if((hasEvent[i]&0x80)==0) return;
			j=hasEvent[i]&0x7f;
//			System.out.println ("j="+j);
			byte[] s=(byte[])(script[1].elementAt(j));
			render();
			runScript(s);
		}
	}
	protected void runScript(byte[] scr) {
		int p=0,d1,d2,d3,t;
		while(p<scr.length){
//			System.out.println ("p="+p);
			switch(scr[p++]&0xff){
			case 0:	//	IF 
				if(scr[p]!=0&&!theGame.flags[scr[p]&0xff]){
					p+=1;
					p=findNext(scr,255,p)+1;
//					System.out.println ("IF(false)");
				}else { p++;/*System.out.println ("IF(true)");*/}
				break;
			case 1:	//	GND
//				System.out.println ("GND");
				d1=scr[p++]&0xff;
				d2=scr[p++]&0xff;
				d3=scr[p++]&0xff;
				gnd.setCell(d1,d2,d3==0x7f?-1:d3);
				break;
			case 2:	//	OBJ
//				System.out.println ("OBJ");
				d1=scr[p++]&0xff;
				d2=scr[p++]&0xff;
				d3=scr[p++]&0xff;
				obj.setCell(d1,d2,d3==0x7f?-1:d3);
				break;
			case 3:	//	SOUND
//				System.out.println ("SOUND");
				d1=scr[p++]&0xff;	
				parent.setState(parent.STATE_MENU);
				bExit=true;
				return;
				// todo: play s.e. here
			case 4:	//	BGM
//				System.out.println ("BGM");
				d1=scr[p++]&0xff;	
				sp.playBgm(d1-1);
				// todo: change bgm
				break;
			case 5:	//	MVSCR
//				System.out.println ("MVSCR");
				d1=scr[p++]&0xff;
				d2=scr[p++]&0xff;
				g.setColor(0);
//				g.fillRect(0,0,scrW,scrH);
				for(d3=0;d3<30;d3+=3){
					g.fillRect(0,d3,scrW,3);
					g.fillRect(0,scrH-d3,scrW,3);
					flushGraphics();
					pause(20);
				}
				g.setClip(0,30,scrW,scrH-60);
				for(d3=0;d3<d2*4;d3++){
					if(d1==0) map.setViewWindow(mapX,mapY-=4,scrW,scrH);
					else if(d1==1) map.setViewWindow(mapX+=4,mapY,scrW,scrH);
					else if(d1==2) map.setViewWindow(mapX,mapY+=4,scrW,scrH);
					else if(d1==3) map.setViewWindow(mapX-=4,mapY,scrW,scrH);
//					System.out.println ("("+mapX+","+mapY+")");
					map.paint(g,0,0);
					flushGraphics();
					pause(70);
				}
				pause(100);
				for(d3=0;d3<d2;d3++){
					if(d1==0) map.setViewWindow(mapX,mapY+=16,scrW,scrH);
					else if(d1==1) map.setViewWindow(mapX-=16,mapY,scrW,scrH);
					else if(d1==2) map.setViewWindow(mapX,mapY-=16,scrW,scrH);
					else if(d1==3) map.setViewWindow(mapX+=16,mapY,scrW,scrH);
					map.paint(g,0,0);
					flushGraphics();
					pause(300);
				}
				g.setClip(0,0,scrW,scrH);
				break;
			case 6:	//	MVCHR
//				System.out.println ("MVCHR");
				d1=scr[p++]&0xff;
				d2=scr[p++]&0xff;
				dir=d1;
				mainChr.setFrameSequence(walkSeq[dir]);
				d3=getKeyStates();
				for(d3=0;d3<d2;d3++){
					if(d1==0) theGame.playerY-=1;
					else if(d1==1) theGame.playerX+=1;
					else if(d1==2) theGame.playerY+=1;
					else if(d1==3) theGame.playerX-=1;
					mainChr.nextFrame();
					render();
					pause(300);
				}
				break;
			case 7:	//	SET
//				System.out.println ("SET");
				theGame.flags[scr[p++]&0xff]=true;
				break;
			case 8:	//	RESET
//				System.out.println ("RESET");
				theGame.flags[scr[p++]&0xff]=false;
				break;
			case 9:	//	TEXT
//				System.out.println ("TEXT");
				//	todo:	display the text
				d1=scr[p++]&0xff;
				drawText(null,(String)text.elementAt(d1));
				break;
			case 10:	//	TALK
//				System.out.println ("TALK");
				//	todo:	display dialog
				d1=scr[p++]&0xff;
				d2=scr[p++]&0xff;
				drawText((String)text.elementAt(d1),(String)text.elementAt(d2));
				break;