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游戏开发入门
gamemidlet.java
import javax.microedition.midlet.midlet;
import javax.microedition.midlet.midletstatechangeexception;
import javax.microedition.lcdui.display;
public class gamemidlet extends midlet {
game game;
display display;
public gamemidlet() {
game = new game(this);
display = display.getdisplay(this);
}
protected void startapp() throws midletstatechangeexception {
game.setgamestate(game.logo, 30);
game.start();
display.setcurrent(game);
}
protected void pauseapp() {
notifypaused();
}
protected void destroyapp(boolean _boolean) throws midletstatechangeexception {
notifydestroyed();
}
}
game.java
import javax.microedition.lcdui.*;
import com.nokia.mid.ui.*;
/**
* <p>title: </p>
*
* <p>description: </p>
*
* <p>copyright: copyright (c) 2005</p>
*
* <p>company: </p>
*
* @author not attributable
* @version 1.0
*/
public class game extends fullcanvas implements runnable ,commandlistener{
private gamemidlet gamemidlet;
private boolean rungame;//游戏是否启动
private int fps;//频率
private int gamestate = -1; //当前游戏状态
/**
* 游戏状态参数
*/
public final byte logo = 0;
public final byte menu = 1;
public final byte about = 2;
public final byte help = 3;
public final byte wait = 4;
public final byte loginform = 5;
public final byte result = 6;
public final byte loading = 7;
public final byte regist = 8;
public final byte game = 9;
private image bufferedimage;//双缓冲图片
private form form;
private command cmdreg, cmdback; // 注册、登陆、返回、修改按钮对象
private textfield tfaccount, tfpassword; // 昵称、密码，textfield对象
/**
* 默认构造方法
*/
public game(gamemidlet midlet) {
gamemidlet = midlet;
int width = 128;
int height = 128;
// create image buffer:
bufferedimage = image.createimage(width, height);
}
protected void keypressed(int keycode) {
if (keycode == -5) {
setgamestate(loginform, 30);
}
}
/**
*设置当前状态
* @param bgamestate byte 状态值
* @param newfps byte 当前状态下的频率
*/
public void setgamestate(int bgamestate,int newfps){
this.release();
this.gamestate = bgamestate;
this.fps = newfps;
this.init();
}
/**
* 设置当前状态
* @param bgamestate int 状态值
*/
public void setgamestate(int bgamestate){
this.release();
this.gamestate = bgamestate;
this.fps = 30;
this.init();
}
/**
* 得到当前状态
* @return int
*/
public int getgamestate(){
return this.gamestate;
}
/**
* 游戏主线程启动
*/
public void start() {
rungame = true;
thread t = new thread(this);
t.start();
}
/**
* 游戏主线程停止
*/
public void stop() {
rungame = false;
}
/**
* 实现runnable接口
*/
public void run() {
graphics g = bufferedimage.getgraphics();//得到graphics绘图对象
long starttime;
int interval = 1000 / this.fps;
byte count = 2;//垃圾回收次数控制
byte n = count;
thread currentthread = thread.currentthread();
while (rungame && currentthread == thread.currentthread()) {
interval = 1000 / this.fps;
starttime = system.currenttimemillis();
this.input();
this.work();
drawscreen(g);
if (gamestate != loginform) {
repaint();//请求刷新屏幕
servicerepaints();
}
waitsomething(starttime, interval);
if (n == 0) {
runtime.getruntime().gc();
n = count;
}
n--;
}
}
/**
* 线程休眠一段时间
* @param loopstarttime long
* @param interval long
*/
protected void waitsomething(long loopstarttime, long interval) {
long time = system.currenttimemillis() - loopstarttime;
if (time < interval) {
try {
thread.sleep(interval - time);
} catch (interruptedexception e) {}
} else {
thread.yield();
}
}
public void paint(graphics g) {
g.drawimage(this.bufferedimage, 0, 0, graphics.top graphics.left);
}
/**
* 当前状态初始化
*/
protected void init() {
switch (getgamestate()) {
case loginform:
initloginform();
break;
default:
break;
}
}
/**
* 当前状态释放资源
*/
protected void release() {
switch (getgamestate()) {
case loginform:
releaseloginform();
break;
default:
break;
}
runtime.getruntime().gc();
}
/**
* 当前状态下的用户输入
*/
protected void input() {
}
/**
* 当前状态下的逻辑处理
*/
protected void work() {
}
/**
* 当前状态下的绘制
* @param g graphics
*/
protected void drawscreen(graphics g) {
switch (getgamestate()) {
case log
g.drawstring("aaa",10,50,0);
break;
default:
break;
}
system.out.println(runtime.getruntime().freememory());
}
private void initloginform(){
form = new form("用户登陆");
tfaccount = new textfield("帐号:", "", 9, textfield.any);
// tfpassword = new textfield("密码:", "", 9, textfield.password);
cmdreg = new command("注册", command.screen, 2);
cmdback = new command("后退", command.back, 3);
form.append(tfaccount);
// form.append(tfpassword);
form.addcommand(cmdreg);
form.addcommand(cmdback);
form.setcommandlistener(this);
gamemidlet.display.setcurrent(form);
}
public void commandaction(command command, displayable displayable) {
if (command == cmdreg) {
setgamestate(logo, 30);
gamemidlet.display.setcurrent(this);
}
}
private void releaseloginform(){
for (int i = form.size() - 1; i >= 0; i --){
form.delete(i);
}
tfaccount = null;
// tfpassword = null;
cmdback = null;
cmdreg = null;
form = null;
}
}
