Java & Slick 遊戲開發(11) - How to Change States

在Play.java

package javagame;

import org.newdawn.slick.*;

import org.newdawn.slick.state.*;

public class Play extends BasicGameState

{

public Play(int State)

{

}

public void init(GameContainer gc,StateBasedGame sbg) throws SlickException

{

}

public void render(GameContainer gc,StateBasedGame sbg, Graphics g) throws SlickException

{

g.drawString("This is the Play State!", 100, 100); → 顯示字符串

}

public void update(GameContainer gc,StateBasedGame sbg, int delta) throws SlickException

{

}

public int getID()

{

return 1;

}

}

在Menu.java

package javagame;

import org.newdawn.slick.*;

import org.newdawn.slick.state.*;

import org.lwjgl.input.Mouse;

public class Menu extends BasicGameState

{

public Menu(int State)

{

}

public void init(GameContainer gc,StateBasedGame sbg) throws SlickException

{

}

public void render(GameContainer gc,StateBasedGame sbg, Graphics g) throws SlickException

{

g.fillOval(75, 100, 100, 100); → 繪製橢圓形

g.drawString("Play Now!", 80, 70);

}

public void update(GameContainer gc,StateBasedGame sbg, int delta) throws SlickException

{

Input input = gc.getInput();

int xpos = Mouse.getX();

int ypos = Mouse.getY();

if((xpos>75 && xpos<175)&&(ypos>160 && ypos<260)){

if(input.isMouseButtonDown(0)){ → 當用戶單擊左鍵

sbg.enterState(1); → 進入到狀態1(Play)

}

}

}

public int getID()

{

return 0;

}

}

當您單擊該橢圓，然後去Play.java: