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我编写了一个简单的 2D Java 游戏，其中有一个玩家在 2D 地图上的俯视图，它随着键盘箭头输入（上、下、左、右）移动，我的 Play 类包含我的所有游戏代码有几种方法，主要的方法是渲染，它将所有内容绘制到屏幕上，例如实际的播放器和地图，以及处理键盘输入、移动播放器和更新图像的更新。

这是我的游戏课程的代码：

     imports are here
    public class Play extends BasicGameState{
    Animation bucky, movingUp, movingDown, movingLeft, movingRight;
    Image worldMap;
    int[] duration = {200, 200};//how long frame stays up for
    float buckyPositionX = 0;
    float buckyPositionY = 0;
    float shiftX = buckyPositionX + 320;//keeps user in the middle of the screem
    float shiftY = buckyPositionY + 160;//the numbers are half of the screen size
    java.awt.geom.Rectangle2D.Float rectOne = new Rectangle2D.Float(shiftX, shiftY,90,90);
    java.awt.geom.Rectangle2D.Float rectTwo = new Rectangle2D.Float(500 + buckyPositionX, 330 + buckyPositionY, 210, 150);
    public Play(int state){
    }   
    public void init(GameContainer gc, StateBasedGame sbg) throws SlickException{
          worldMap = new Image("res/world.png");
          Image[] walkUp = {new Image("res/b.png"), new Image("res/b.png")}; //these are the images to be used in the "walkUp" animation
          Image[] walkDown = {new Image("res/f.png"), new Image("res/f.png")};
          Image[] walkLeft = {new Image("res/l.png"), new Image("res/l.png")};
          Image[] walkRight = {new Image("res/r.png"), new Image("res/r.png")};
    movingUp = new Animation(walkUp, duration, false);
    movingDown = new Animation(walkDown, duration, false);  
    movingLeft = new Animation(walkLeft, duration, false);  
    movingRight = new Animation(walkRight, duration, false);
    bucky = movingDown;//facing screen initially on startup
    }
    public void render(GameContainer gc, StateBasedGame sbg, Graphics g) throws SlickException{
    worldMap.draw(buckyPositionX, buckyPositionY);//position 0,0
    bucky.draw(shiftX, shiftY);//makes him appear at center of map
    g.fillRect((float)rectOne.getX(), (float)rectOne.getY(), (float)rectOne.getWidth(), (float)rectOne.getHeight());
    g.fillRect((float)rectTwo.getX(), (float)rectTwo.getY(), (float)rectTwo.getWidth(), (float)rectTwo.getHeight());
}
    public void update(GameContainer gc, StateBasedGame sbg, int delta)throws SlickException{
    Input input = gc.getInput();
    //up
    if(input.isKeyDown(Input.KEY_UP)){
        bucky = movingUp;//changes the image to his back
        buckyPositionY += 2;;//increase the Y coordinates of bucky (move him up)
        if(buckyPositionY>162){//if I reach the top 
            buckyPositionY -= 2;//stops any further movement in that direction
        }
    }
    //down
    if(input.isKeyDown(Input.KEY_DOWN)){
        bucky = movingDown;
        buckyPositionY -= 2;
        if(buckyPositionY<-550){
            buckyPositionY += 2;//basically change the direction if + make -
    }}
    //left
    if(input.isKeyDown(Input.KEY_LEFT)){
        bucky = movingLeft;
        buckyPositionX += 2;
        if(buckyPositionX>324){
            buckyPositionX -= 2;//delta * .1f
    }}
    //right
    if(input.isKeyDown(Input.KEY_RIGHT)){
        bucky = movingRight;
        buckyPositionX -= 2;
        if(buckyPositionX<-776){
            buckyPositionX += 2;
    }}}   
    public int getID(){
        return 1;
    }}

我需要通过将 rectTwo 放在我的更新类中来更新它的位置，但是在编写代码来执行此操作时遇到问题，有人可以帮我解决这个问题吗？

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1 回答 1

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你的意思是更新方法？

你想做什么样的更新？他的立场？您是否在更新方法中尝试过类似的方法：

公共无效更新（GameContainer gc，StateBasedGame sbg，int delta）抛出 SlickException {

Input input = gc.getInput();
//up
if(input.isKeyDown(Input.KEY_UP)){
     rectTwo.setRect(float x, float y, float w, float h) ;
     ....

y 可以是 rectTwo.getY() + 2 取决于你自己的规则

于 2013-01-05T18:12:09.280 回答