LibGDX - 只有可拖動的運動 (LibGDX - only draggable movement)

問題描述

LibGDX ‑ 只有可拖動的運動 (LibGDX ‑ only draggable movement)

:D 我目前正在為 Android 創建我的第一個 LibGDX 遊戲。而且我遇到了一個關於我的小玩家（這是一個桶；））的運動的問題。我想讓桶（播放器）只能在 x 軸上拖動，而不能點擊來改變位置。y 軸不會成為問題，因為桶只能改變 x 軸上的位置。所以我基本上想讓桶只能拖動。抱歉我的寫作，英語不是我的母語。

這是我的代碼中的代碼片段，運動在其中運行：

    if (Gdx.input.isTouched()){
    Vector3 touchPos = new Vector3();
    touchPos.set(Gdx.input.getX(), Gdx.input.getY(), 0);

    //Check the values
    float touchPosX = Gdx.input.getX();
    float touchPosY = Gdx.input.getY();
    String touchXString = Float.toString(touchPosX);
    String touchYString = Float.toString(touchPosY);
    Gdx.app.log("Movement ‑ X", touchXString);
    //Gdx.app.log("Movement ‑ Y", touchYString);
    Gdx.app.log("Movement ‑ BucketX", bucketXString);
    //Gdx.app.log("Movement ‑ BucketY", bucketYString)
    camera.unproject(touchPos);
    bucket.x = touchPos.x ‑ 64 / 2;;}

代碼有點亂……

參考解法

方法 1:

If I understand correctly, what you want is that the bucket only moves when you are dragging it, and right now what it does is move to whatever "x" you clicked/taped, even if that "x" is far from the bucket, thus "teleporting" it.

To do this, first have a boolean lets say, "btouched".

boolean btouched = false;

Then you will have to use an Input Processor (instead of InputPolling). to check in the touchdown event if the click/tap was inside the bucket, then only if it was, it will move in the drag event:

MyInputProcessor inputProcessor;

public class MyInputProcessor implements InputProcessor{

@Override
public boolean touchDown(int screenX, int screenY, int pointer, int button){
    camera.unproject(touchPos.set(Gdx.input.getX(pointer), Gdx.input.getY(pointer), 0));
    if(bucket.contains(touchPos)){
        btouched = true;
    }else{
        btouched = false;
    }
    return false;
}

@Override
public boolean touchDragged(int screenX, int screenY, int pointer){
    camera.unproject(touchPos.set(Gdx.input.getX(pointer), Gdx.input.getY(pointer), 0));
    if(btouched){
        bucket.x = touchPos.x ‑ 64 / 2;
    }
    return false;
}

    ...
}

Dont forget to set the input processor:

inputProcessor = new MyInputProcessor();
Gdx.input.setInputProcessor(inputProcessor);

(by Andreas Johansson、Lestat)

參考文件

1. LibGDX ‑ only draggable movement (CC BY‑SA 3.0/4.0)