使用libgdx和box2d将身体移到触摸位置 [英] Move a body to the touched position using libgdx and box2d

问题描述

我试图将没有重力的物体移动到单击或触摸位置，然后将其停止。但是，由于我的Vector3的坐标，取决于我单击的位置，它的移动速度实际上是快还是慢。另外，它的行为就像我不想要的游戏小行星一样。

I am trying to move a body with no gravity to the click or touch position and then stop it. However, depending where I click it moves really fast or really slow because of the coordinates of my Vector3. Also, it behaves like that game asteroids which I do not want.

基本上，我只需要myBody跟随鼠标的点击进行触摸即可。

Basically, I just need myBody follows the click of the mouse our touch.

在这里到目前为止：

@Override
public boolean touchDown(int screenX, int screenY, int pointer, int button) {

    camera.unproject(touchPosition.set(screenX, screenY, 0));

    Vector2 velocity = new Vector2(touchPosition.x, touchPosition.y);
    myBody.setLinearVelocity(velocity);

    return true;
}

推荐答案

您需要规范化考虑身体本身的位置。以下代码未经测试，但可以正常工作。

You need to normalize and also take the position of the body itself into account. The following code is untested, but should work.

@Override
public boolean touchDown(int screenX, int screenY, int pointer, int button) {
    camera.unproject(touchPosition.set(screenX, screenY, 0));

    // calculte the normalized direction from the body to the touch position
    Vector2 direction = new Vector2(touchPosition.x, touchPosition.y);
    direction.sub(myBody.getPosition());
    direction.nor();

    float speed = 10;
    myBody.setLinearVelocity(direction.scl(speed));

    return true;
}

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