Question

我编写了一个简单的2D Java游戏，其中2D地图上有一个玩家的俯视图，随着键盘箭头输入（向上，向下，向左，向右）移动，我的Play类可以保存我的所有游戏代码由几种方法组成，主要是渲染，将所有内容绘制到屏幕上，例如实际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;
    }}

我需要更新rectTwo，将它放在我的更新类中，这会更新它的位置，但是在编写代码时遇到问题，有人可以帮我解决这个问题吗？

Answer 1

你的意思是更新方法吗？

您想要做什么样的更新？他的立场？你在更新方法中尝试过类似的东西吗？

public void update（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，具体取决于你自己的规则

Java 2D游戏，更新矩形

1 个答案: