JAVA遊戲程式設計之二----j2me MIDlet 手機遊戲入門開發--貪吃蛇

作者：雷神

QQ:38929568

QQ群：28048051JAVA遊戲程式設計（滿） 28047782（将滿）

與前一款掃雷比較，這個遊戲多了一個類，用來顯示動畫，也是蛇要吃的物品類，也有了代碼包，圖檔包，結構清晰，代碼量500行，地圖生成的簡單算法，和播放動畫的簡單算法！有矩形碰撞，更新就是增加蛇的移動速度，簡單做法就是把重新整理速度提高了，每次重新整理蛇要移動一個格子，出現的物品有的是增加蛇長度的，有的是減少蛇長度的。

本文給出的是程式代碼，需要圖檔才能編譯程式，

Gif.java 這個類是繪制動畫的類，也是蛇的食物類

package code;

import javax.microedition.lcdui.Image;

import javax.microedition.lcdui.Graphics;

public class Gif

...{

public String name = "gif";

public int life = 1;

public int pos_x = 0;

public int pos_y = 0;

public int w = 10;

public int h = 10;

public int form = 1;

private int allTime;

private int currForm;

private long startTime;

public boolean isShow=true;

public int[] formTime=...{100};

private Image[] img;

public Gif( String _name, int _form, int _w, int _h )

...{

w = _w;

h = _h;

setGif( _name, _form );

startTime = System.currentTimeMillis();

setPos();

}

public void setGif( String _name, int _form )

try

...{

name = _name;

form = _form;

formTime= new int[form];

img = new Image[form];

for( int i=0; i<form; i++ )

...{

formTime[i] = 100;

allTime += formTime[i];

img[i] = Image.createImage("/pics/"+name+"_"+i+".png");

}

// Image temp = Image.createImage("/pics/"+name+".png");

// form = temp.getWidth()/w;

// formTime = new int[form];

// img = new Image[form];

// Graphics gn;

// for( int i=0; i<img.length; i++ )

// {

// formTime[i] = 100;

// allTime +=formTime[i];

// img[i] = Image.createImage(w, h);

// gn = img[i].getGraphics();

// gn.drawImage(temp, -i*w, 0, gn.LEFT|gn.TOP);

// }

// gn = null;

// temp = null;

// System.gc();

}catch(Exception e)...{ e.printStackTrace(); }

public void setPos()

pos_x = cGame.rand.nextInt(cGame.s_width-w) + ( w>>1 );

pos_y = cGame.rand.nextInt(cGame.s_height-h) + ( h>>1 );

public void setFormTime(int[] _formTime)

formTime = _formTime;

allTime = 0;

for( int i=0; i<formTime.length; i++ )

allTime +=formTime[i];

}

public void paint(Graphics g)

if( isShow )

long now = System.currentTimeMillis();

long time= (now-startTime)%allTime;

for(int i=0; i<form; i++)

time -= formTime[i];

if( time<=0 )

...{

g.drawImage(img[i], pos_x, pos_y, g.HCENTER|g.VCENTER);

break;

}

cGame.java 這個類已經不陌生了, 作用功能和上一個遊戲雷同

////////////////////////////////////////////////////////////////////////////////

// cGame.java

// Project: Minesweeper

// Author(s): Gao Lei

// Create: 2007-10-12

import java.util.Random;

import javax.microedition.lcdui.*;

class cGame extends Canvas implements Runnable

private static final int STATEPLAY = 0;

private static final int STATELOST = 1;

private static final int STATEWIN = 2;

private static final int KEY_UP = 1;

private static final int KEY_DOWN = 2;

private static final int KEY_LEFT = 3;

private static final int KEY_RIGHT = 4;

private static final int KEY_FIRE = 5;

public static int s_width = 0;

public static int s_height = 0;

public static long updates = 0;

public static Random rand;

private int maxRand = 1000;

private int map_x = 10;

private int map_y = 10;

private int map_w = 16;

private int map_h = 16;

private int key_x = map_x / 2;

private int key_y = map_y / 2;

private int snake_w = 8;

private int snake_h = 8;

private int pos_x = map_x / 2;

private int pos_y = map_y / 2;

private int aspect_x= 0;

private int aspect_y= 1;

private int snake_max = 100;

private int snake_n = 5;

private int gameState = STATEPLAY;

private int level = 1;

private long sleepTime =160;

private int[] snake_x = new int[ snake_max ];

private int[] snake_y = new int[ snake_max ];

private int[][] map;

private boolean isShowInfo = false;

private Font font = Font.getFont( Font.FACE_SYSTEM, Font.STYLE_BOLD, Font.SIZE_LARGE );

private Thread thread;

private Image[] imgGameBg = new Image[4];

private Image[] imgItem = new Image[3];

private Gif[] gold = new Gif[5];

private Gif[] dung = new Gif[2];

private Gif fungus;

cGame()

setFullScreenMode(true);

s_width = getWidth();

s_height= getHeight();

rand = new Random( System.currentTimeMillis() );

for( int i=0; i<gold.length; i++ )

gold[i]= new Gif("gold", 5, 19, 15 );

for( int i=0; i<dung.length; i++ )

dung[i]= new Gif("dung", 6, 21, 30 );

dung[i].life = -2; // --life

fungus = new Gif("fungus", 12, 25, 23 );

fungus.setFormTime

(

new int[] ...{ 2000, 150, 150, 150,

150, 200, 100, 100,

200, 150, 200, 200

}

);

fungus.life = 5; // --life +5

for( int i=0; i<imgItem.length; i++ )

imgItem[i]=Image.createImage("/pics/item_16_"+i+".png");

Image temp = Image.createImage("/pics/bg_tile_0.png");

Graphics gn;

for( int i=0; i<imgGameBg.length; i++ )

imgGameBg[i] = Image.createImage(16, 16);

gn = imgGameBg[i].getGraphics();

gn.drawImage(temp, -i*16, 0, gn.LEFT|gn.TOP);

gn = null;

temp = null;

System.gc();

}catch(Exception e)...{ e.printStackTrace(); }

rePlay( level );

thread = new Thread(this);

thread.start();

public void run()

while( true )

try

updates++;

repaint();

serviceRepaints();

thread.sleep(sleepTime);

}catch(Exception e)

e.printStackTrace();

g.setClip(0, 0, s_width, s_height);

g.setColor(0x000000);

g.fillRect(0, 0, s_width, s_height);

for( int i=0; i<map_x; i++ )

for( int j=0; j<map_y; j++ )

g.drawImage(imgGameBg[ map[i][j] ], j*map_h, i*map_w, g.LEFT|g.TOP);

}

for( int i=0; i<gold.length; i++ )

gold[i].paint(g);

for( int i=0; i<dung.length; i++ )

dung[i].paint(g);

if( snake_n>20 )

fungus.paint( g );

paintSnake( g );

if( isShowInfo || gameState != STATEPLAY )

g.setColor(0xFFFFFF);

for( int i=0; i<=map_y; i++ ) // |||

g.drawLine(i*map_w, 0, i*map_w, map_h*map_x);

for( int i=0; i<=map_x; i++ ) // ===

g.drawLine(0, i*map_h, map_y*map_w, i*map_h);

g.setFont( font );

g.setColor( 0xff0000 );

g.setFont( font );

g.drawString( "life:"+snake_n, 2, 2, 0 );

g.drawString( "level:"+level, 2, 18, 0 );

void paintSnake( Graphics g )

g.setColor(0x0000FF);

for( int i=snake_n; i>0; i-- )

snake_x[i] = snake_x[i-1];

snake_y[i] = snake_y[i-1];

g.fillRect(snake_x[i]-snake_w/2, snake_y[i]-snake_h/2, snake_w, snake_h);

snake_x[0] += aspect_x*8;

snake_y[0] += aspect_y*8;

g.setColor(0x6666FF);

g.fillRect(snake_x[0]-snake_w/2, snake_y[0]-snake_h/2, snake_w, snake_h);

if( snake_x[0]<0 || snake_x[0]>s_width || snake_y[0]<0 ||snake_y[0]>s_height )

rePlay(level);

for( int i=snake_n; i<snake_n; i++ )

if( isIntersect(snake_x[0], snake_y[0], snake_w, snake_h,

snake_x[i], snake_y[i], snake_w, snake_h )

)

rePlay(level);

if( isIntersect(snake_x[0], snake_y[0], snake_w, snake_h,

gold[i].pos_x, gold[i].pos_y, gold[i].w, gold[i].h )

)

addSnake( gold[i].life );

gold[i].setPos();

dung[i].pos_x, dung[i].pos_y, dung[i].w, dung[i].h )

addSnake( dung[i].life );

dung[i].setPos();

if( isIntersect(snake_x[0], snake_y[0], snake_w, snake_h,

fungus.pos_x, fungus.pos_y, fungus.w, fungus.h )

)

addSnake( fungus.life );

// fungus.isShow =false;

fungus.setPos();

boolean isIntersect(int x1,int y1, int w1, int h1, int x2, int y2, int w2, int h2)

if( Math.abs(x2-x1) < (w1+w2)/2 && Math.abs(y2-y1) < (h1+h2)/2 )

return true;

else

return false;

public void keyPressed(int key)

key = Math.abs(key);

System.out.println("key="+key);

switch( key )

case KEY_NUM2:

case KEY_UP:

if( gameState != STATEPLAY )

else

if( aspect_y <= 0)

...{

aspect_x = 0;

aspect_y = -1;

}

break;

case KEY_NUM8:

case KEY_DOWN:

if( gameState != STATEPLAY )

if( aspect_y >= 0)

aspect_y = +1;

case KEY_NUM4:

case KEY_LEFT:

if( aspect_x <= 0)

aspect_y = 0;

aspect_x = -1;

case KEY_NUM6:

case KEY_RIGHT:

if( aspect_x >= 0)

aspect_x = +1;

case KEY_FIRE:

case KEY_NUM5:

if( gameState == STATEPLAY )

// addSnake();

// System.out.println("snake_n="+snake_n);

case KEY_NUM1:

case KEY_NUM3:

isShowInfo = !isShowInfo;

case KEY_NUM0:

rePlay( level );

this.repaint();

private void addSnake(int life)

snake_n += life;

if( snake_n > snake_max )

snake_n = snake_max;

level++;

if( snake_n < snake_n ) //game over

snake_n = snake_n;

public void rePlay( int level )

sleepTime = 150-level*20;

map_x = s_height/16;

map_y = s_width/16;

key_x = map_x>>1;

key_y = map_y>>1;

gameState = STATEPLAY;

map = new int[map_x][map_y];

isShowInfo = false;

snake_n = 5;

aspect_x = 0;

aspect_y = 0;

for( int i=0; i<map_x; i++ ) //draw bg

int r = rand.nextInt(maxRand);

for( int k=0; k<imgGameBg.length; k++ )

if( r < maxRand>>k+1 )

map[i][j] = k;

for( int i=0; i<snake_n; i++ ) //init snake

snake_x[i] = s_width>>1;

snake_y[i] = (s_height>>1)-(i*snake_h);

Snake.java這個類是之前的 Minesweeper.java這個類基本上就該個名字，其他什麼都不用改！

///////////////////////////////////////////////////////////////////////////////////////////////////

// Snake.java

// Project: Snake

// Create: 2007-10-08

package code;

import javax.microedition.midlet.*;

import javax.microedition.lcdui.*;

public class Snake extends MIDlet

static Snake s_midlet;

static Display s_display = null;

static cGame s_game = null;

public Snake()

s_midlet = this;

public void startApp()

if (s_display == null)

s_display = Display.getDisplay(this);

if (s_game == null)

s_game = new cGame();

s_display.setCurrent(s_game);

}

else

public void pauseApp()

public void destroyApp(boolean unconditional)

notifyDestroyed();

這次代碼上的注釋比較少的原因是我的IDE不支援中文輸入！是以即便是加注釋也是英文的！就沒加了

大多數函數方法和上個遊戲沒多大變化！

本文轉自 kome2000 51CTO部落格，原文連結:http://blog.51cto.com/kome2000/578507

JAVA遊戲程式設計之二----j2me MIDlet 手機遊戲入門開發--貪吃蛇

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