Question

好的这段代码，我把一个可爱的小游戏扔在了一起。理论上，level.java应该启动Menu.java，一旦在屏幕上点击播放按钮，你应该转移到Playing.java状态。不幸的是，当发生这种情况时（点击播放按钮，在这种情况下是硬币）我在控制台中得到了大量的胡言乱语（至少对我来说）。所以我问你们这些是这个。为什么会发生这种情况？有哪些可能的解决方案？是否有任何调试技巧可用于破译我的控制台中出现的内容？继承人的“水平”：

import org.newdawn.slick.*;
import org.newdawn.slick.state.*;


public class level extends StateBasedGame{


public static final String gamename = "Flight 1.0 ";
public static final int menu = 0;
public static final int playing = 1;


public level(String gamename){
super(gamename);
    this.addState(new Menu(menu));
    this.addState(new Playing(playing));

 }

public void initStatesList(GameContainer gc)throws SlickException{

        this.getState(menu).init(gc, this);
        this.getState(playing).init(gc, this);
        this.enterState(menu);

}

public static void main(String args[]){

 AppGameContainer appgc;
 try{
  appgc = new AppGameContainer(new level(gamename));
  appgc.setDisplayMode(800, 600, false);
  appgc.start();

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

这是带有播放按钮的“菜单”：

import org.lwjgl.input.Mouse;
import org.newdawn.slick.*;
import org.newdawn.slick.state.*;

public class Menu extends BasicGameState{
 Image play;
  int xpos = Mouse.getX();
  int ypos = Mouse.getY();
 public Menu(int state){


 }

 public void init(GameContainer gc, StateBasedGame sbg)throws SlickException{
  play = new Image("Resources\\coin.gif");

 }
 public void render(GameContainer gc, StateBasedGame sbg, Graphics g)throws SlickException{
g.drawImage(play, 0, 0);


 }

public void update(GameContainer gc, StateBasedGame sbg, int delta)throws SlickException{
  Input input = gc.getInput();

  if((xpos >= 0 && xpos <= 127) && (ypos>= 0 && ypos <= 33)){
   if(input.isMouseButtonDown(0)){
    sbg.enterState(1);
   }
  }

}
public int getID(){
 return 0;
}
}

最后我试图转移的“播放”：

import org.newdawn.slick.*;
import org.newdawn.slick.state.*;
public class Playing extends BasicGameState{



    //game objects
    Image guy;
    Image coin1;
    Image coin2;

    //object coordinates
     float x = 30, y = 50;
     float coin1x = 1000, coin1y = 500;
     float coin2x = 1100, coin2y = 400;
     float rect1x = 1000, rect1y = 225;
     //coin counter
     int coincount = 0;
//ignore
 public Playing(int state){}
 //declare items
 public void init(GameContainer gc, StateBasedGame sbg)throws SlickException{
      guy = new Image("Resources\\PlaneMovie1.gif");
      coin1 = new Image("Resources\\coin.gif");
      }
 //draw items
 public void render(GameContainer gc, StateBasedGame sbg, Graphics g)throws SlickException{
     g.drawImage(guy, x, y);
     g.drawImage(coin1, coin1x, coin1y);
     g.drawImage(coin2, coin2x, coin2y);
     g.drawString("Coins: " + coincount, 100, 100);
     g.drawRect(rect1x, rect1y, 50, 425);
 }
//declare changes to items
public void update(GameContainer gc, StateBasedGame sbg, int delta)throws SlickException{
    //plane movement/controls
    Input input = gc.getInput();
    if(input.isKeyDown(Input.KEY_SPACE)){ y -= 1 ;}
    if(input.isKeyDown(Input.KEY_SPACE) == false){
        y += .5;

    }
    //coin counter
    if (x == coin2x && y == coin2y){
        coincount +=1 ;
    }
    if(x == coin1x && y == coin1y){
        coincount += 1;

    }
    //coin 1
    coin1x --;
    if(coin1x <= -100){
        coin1x = 1000; coin1y -= 100;
    }

    if (coin1y <= 100){
        coin1y = 500;
    }
    //coin 2
    coin2x --;
    if(coin2x <= -100){
        coin2x = 1100; coin2y -= 100;
    }

    if (coin2y <= 100){
        coin2y = 500;
    }
    //rect1
    rect1x --;

    if(rect1x <= -100){
        rect1x = 1000; rect1y -= 100;
    }

    if (coin1y <= 100){
        rect1y = 425;
    }



}
//ignore
public int getID(){
 return 1;
}
}

非常感谢任何帮助，这是我在StackOverflow上的第一篇文章，因此非常感谢建设性的批评。

Answer 1

与图形坐标相比，Slick2d中的鼠标坐标反转。例如：

当您处于（0,0）时，鼠标Y将等于您的屏幕高度。我希望这能解决你的问题。

修改

进一步看，我发现Playing类中的coin2没有分配给它的图像因此因为nullpointer异常而崩溃，即你需要分配一个像其他图像一样的图像。

以下是更新鼠标坐标的编辑更新方法（并将Y坐标设置为与图像坐标相同的格式：

public void update(GameContainer gc, StateBasedGame sbg, int delta)throws SlickException{ xpos = Mouse.getX(); // 600 is the Screen height ypos = Math.abs(600-Mouse.getY()); if((xpos >= 0 && xpos <= 127) && (ypos>= 0 && ypos <= 33)){ if(Mouse.isButtonDown(0)){ sbg.enterState(1); } } }

使用slick2D无法移动状态

1 个答案: