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遊戲主選單 『屏幕』通常有 『圖標』『選單 』.所要做是『觸摸』選單 時切換『屏幕』.計算出選單 項『矩形區域』與觸碰點重疊時切換『屏幕』在這裡設定四個選單 項.你需要繪畫『文本紋理』寬高相等並是2倍數.背景色設為透明色.並且保存為『.PNG』. 『文本紋理』好在於研發時用英文文本之後再漢化.

你需定義『2D相機』屏幕原點在左下角、VECTOR2D『點』把觸碰座標轉換屏幕座標、渲染『圖標』區域.定義四個按鈕『新遊戲』『繼續遊戲』『高分榜』『遊戲設定』每當更新屏幕update()對四個選單 區域進行overlap()『矩形碰撞測試』.而渲染『屏幕』時則先渲染『背景』後渲染『選單』

選單項	簡介
NEW	啟動新遊戲
PLAY	繼續遊戲按扭
Highscores	高分排名榜
Settings	遊戲設定

public class ScreenMain  extends SCREEN{

private CAMERA2D camera;

private VECTOR2D  touchPoint;

private    RECT2D Bounds_Logo;

private    RECT2D Bounds_New;

private    RECT2D Bounds_Play;

private   RECT2D Bounds_Highscores;

private   RECT2D Bounds_Settings;

購造入口屏幕

public ScreenMain(){

camera = new CAMERA2D(320, 480);// 相機

Bounds_Logo = new RECT2D(WORLD.PIXEL_WIDTH/2, WORLD.PIXEL_HEIGHT/2 + 160 , 256, 128);

Bounds_New = new RECT2D(WORLD.PIXEL_WIDTH/2, WORLD.PIXEL_HEIGHT/2 + 64,  128, 32);

Bounds_Play = new RECT2D(WORLD.PIXEL_WIDTH/2, WORLD.PIXEL_HEIGHT/2 + 32,  128, 32);

Bounds_Highscores = new RECT2D(WORLD.PIXEL_WIDTH/2, WORLD.PIXEL_HEIGHT/2 , 256, 32);

Bounds_Settings = new RECT2D(WORLD.PIXEL_WIDTH/2, WORLD.PIXEL_HEIGHT/2 – 32,  256, 32);

touchPoint        = new VECTOR2D();// 觸碰點

}

更新屏幕都觸碰座標

@Override

public void update(float deltaTime){

for(int i = 0; i < TOUCH.Point_Count; i++){

int action = TOUCH.Point_Action[i];

if(action != TOUCH.ACTION_UP)

continue;

float x = TOUCH.Point_X[i];

float y = TOUCH.Point_Y[i];

touchPoint.set(x, y);

camera.TouchToWorld(touchPoint);//觸摸坐標轉世界坐標

if(Bounds_New.overlap(touchPoint)){// 新遊戲按扭

TOUCH.clear();// 清空

SOUND.Play(ASSETS.sound_click);// 點擊

GAME.setScreen(GAME.getGameScreen());// 遊戲按扭

return;

}

else

if(Bounds_Play.overlap(touchPoint)){// 遊戲按扭

SOUND.Play(ASSETS.sound_click);// 點擊

GAME.setScreen(GAME.getGameScreen());// 遊戲按扭

TOUCH.clear();// 清空

break;

}

else

if(Bounds_Highscores.overlap(touchPoint) ){// 高分按扭

SOUND.Play(ASSETS.sound_click);// 點擊

GAME.setCurrentScreen(GAME.getScoreScreen());

TOUCH.clear();// 清空

break;

}

else

if(Bounds_Settings.overlap(touchPoint)){// 設定按鈕

SOUND.Play(ASSETS.sound_click);// 點擊

GAME.setScreen(GAME.getSettingsScreen());

TOUCH.clear();// 清空

break;

}

}

TOUCH.clear();// 清空

}

渲染屏幕

@Override

public void present(float deltaTime){

GL10            gl   = GRAPHICS.gl;

GLSurfaceView view   = GRAPHICS.gl_View;

gl.glClear(GL10.GL_COLOR_BUFFER_BIT);

camera.SetViewportAndMatrices();

gl.glEnable(GL10.GL_TEXTURE_2D);

BATCHER.Begin(ASSETS.texture_background);

BATCHER.Draw(WORLD.PIXEL_WIDTH/2,WORLD.PIXEL_HEIGHT/2, WORLD.PIXEL_WIDTH, WORLD.PIXEL_HEIGHT, ASSETS.region_background);// 渲染背景

BATCHER.End();

// 設為透明

gl.glEnable(GL10.GL_BLEND);

gl.glBlendFunc(GL10.GL_SRC_ALPHA, GL10.GL_ONE_MINUS_SRC_ALPHA);

BATCHER.Begin(ASSETS.texture_text);

BATCHER.Draw(Bounds_Logo,  ASSETS.region_logo);// 圖標按扭

BATCHER.Draw(Bounds_New,  ASSETS.region_new);// 圖標按扭

BATCHER.Draw(Bounds_Play,  ASSETS.region_play);// 主選單

BATCHER.Draw(Bounds_Highscores,ASSETS.region_highscores);// 高分按扭

BATCHER.Draw(Bounds_Settings, ASSETS.region_settings);// 設定按扭

BATCHER.End();

gl.glDisable(GL10.GL_TEXTURE_2D);// 禁用

}

暫停保存設置

@Override

public void pause(){

}

恢復

@Override

public void resume(){

}

清除/銷毀

@Override

public void dispose(){

}

返回鍵

@Override

public boolean back(){

SOUND.Shutdown();

MUSIC.Shutdown();

return  true;

}

}

 

 

在遊戲啟動需從磁盤讀取遊戲選項與得分.在GLSurfaceView.Renderer.onSurfaceCreated()中讀取讀取.首先確立文檔名

String  filename = “settings.dat”;

打開文檔並返回輸入流

InputStream file = FileIO.ReadFile(filename);

打開讀取器

InputStreamReader stream = new InputStreamReader(file);

打開讀取緩存

BufferedReader in = new BufferedReader(stream);

String text;

讀取遊戲前五個最高得分

int[]   highscores = new int[] {0,0,0,0,0};// 高分榜

for(int i=0;i<5;++i){

讀取一行文本,並轉換為得分.

text = in.readLine();

highscores[i] = Integer.parseInt(text);

}

用戶可能關閉音量

text = in.readLine();

boolean soundEnabled = Boolean.parseBoolean(text);

讀取遊戲音量.值為浮點數(0~1)

text = in.readLine();

float soundVolume = Float.parseFloat(text);

遊戲關卡整數值大於1

text = in.readLine();

int     level = Integer.parseInt(text);

道具量整數值大於或等於零

text = in.readLine();

int     bombs = Integer.parseInt(text);

讀取完畢關閉讀取緩存

in.close();

 

在遊戲退出時需將所有選項與得分寫入磁盤.在GLSurfaceView.onPause()中保存.打開文檔並返回輸出流

OutputStream file = FileIO.WriteFile(filename);

打開寫入器

OutputStreamWriter stream = new OutputStreamWriter(file);

打開寫入緩存

BufferedWriter out = new BufferedWriter(stream);

寫入遊戲五個最高得分

for(int i=0;i<5; i++){

out.write(Integer.toString(highscores[i]));

寫入換行

out.write(“\r”);

}

寫入聲音開關

out.write(Boolean.toString(soundEnabled));

out.write(“\r”);

寫入音量值(0~1)浮點數

out.write(Float.toString(soundVolume));

out.write(“\r”);

寫入當前關卡整數值

out.write(Integer.toString(level));

out.write(“\r”);

寫入道具量整數值

out.write(Integer.toString(bombs));

out.write(“\r”);

關閉寫入緩存

out.close();

 

加入得分並進行高分排序

public static void addScore(int score){

for(int i=0;i<5; ++i){

if(highscores[i] < score){

for(int j=4; j>i; –j)

highscores[j] = highscores[j-1];// 往後移

highscores[i] = score;// 插入分數

break;

}

}

 

設計抽象『屏幕』SCREEN類.為以後屏幕設計提供模板.update()更新所有對像.而present()則負責渲染. deltaTime為每次調用時間間隔. pause()與resume()當遊戲『暫停』與『恢復』時調用. 而dispose()則在遊戲退出時銷毀所有資源.釋放『記憶體』並保存設置.

public abstract class SCREEN {

public abstract void update(float deltaTime);// 更新

public abstract void present(float deltaTime);// 渲染

public abstract void pause();// 暫停

public abstract void resume();// 恢復

public abstract void dispose();// 清除/銷毀

public abstract boolean back();//檢查返會鍵

}

另需要『屏幕切換系統』GAME.每當設換屏幕時首先『暫停』然後『銷毀』資源並保存設置.然後設定新屏幕並『恢復』與『更新』.

public class GAME {

static private SCREEN  screen = null;// 當前屏幕

設置當前屏幕

static public void setCurrentScreen(SCREEN newScreen){

if(screen != null){

screen.pause();// 暫停

screen.dispose();// 銷毀

}

screen = newScreen;

screen.resume();// 恢復

screen.update(0);// 更新

}

獲取當前屏幕

static public SCREEN getCurrentScreen() {

return screen;

}

}